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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Occupational and Environmental Hygiene
Journal Basic Information
Journal DOI :
Korean Industrial Hygiene Association
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Volume & Issues
Volume 25, Issue 4 - Dec 2015
Volume 25, Issue 3 - Sep 2015
Volume 25, Issue 2 - Jun 2015
Volume 25, Issue 1 - Mar 2015
Selecting the target year
Issue Analysis on 'Trade Secret Claim' in 「Chemicals Control Act」 and 「Amendment on Occupational Safety and Health Act(1917-227)」
Kim, Shinbum ; Lee, Yun Keun ; Choi, Youngeun ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 433~445
DOI : 10.15269/JKSOEH.2015.25.4.433
Objectives: The major objectives of this study are to review the issues surrounding trade secret claims in the Chemicals Control Act and Amendment on Occupational Safety and Health Act(1917-227) and to propose a way of improving the reliability of chemical information in MSDSs, labels and National Chemical Survey results. Materials: To review the issues on trade secret claims, we made an analysis frame which was divided into three steps: Value and Problem Recognition; New Regulation Design; and Enforcement and Amendment. We then compared Korean issues with issues from the United States' Hazard Communication Standard and Emergency Planning & Community Right-to-Know Act, Canada's Workplace Hazardous Materials Information System and Hazardous Materials Information Review Act and the European Union's Regulation on Classification, Labelling and Packaging of substances and Mixtures. Results: The stage of right-to-know development in Korea has passed the Value and Problem Recognition phase, so efforts are needed to elaborately design new regulation. Conclusions: We recommend two ways to improve right-to-know in Korea. First, strict examination of the quality of documents for trade secret claims is very important. Second, trade secrets should be limited to less-hazardous substances.
Task-Specific Hazardous Chemicals Used by Nail Shop Technicians
Choi, Sangjun ; Park, Sung-Ae ; Yoon, Chungsik ; Kim, Sunju ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 446~464
DOI : 10.15269/JKSOEH.2015.25.4.446
Objectives: This study was conducted to evaluate the task-specific hazards of chemicals used by nail technicians in Daegu Metropolitan City. Materials: A total of 30 nail shops located in Daegu City were surveyed to investigate the major tasks and practices performed by nail technicians and the ingredients listed in nail care products used in shops. We also collected instructions for use and material safety data sheets(MSDSs) of nail care products and compared CAS Nos. of ingredients with the lists of chemicals regulated by the Industrial Safety and Health Act(ISHA) and Chemical Substances Control Act(CSCA). Results: A total of 125 chemical ingredients were found in 468 nail care products used at the 30 nail shops. The most frequently found ingredients were ethyl acetate(72%), followed by n-butyl acetate(71.8%), isopropanol(56%), benzophenone(51.1%), nitrocellulose(46.4%) and ethanol(45.3%). Comparing six tasks, the task of manicuring used the most products at 222 products containing 91 ingredients. Among the 125 ingredients, there are 31 chemicals with occupational exposure limits(OEL) designated by the Ministry of Employment and Labor(MoEL), eight categorized as carcinogens, one mutagen and two reproductive toxic chemicals. In terms of carcinogens, formaldehyde was identified as the only confirmed human carcinogen(1A). We found that there was one chemical with a permissible limit, one special management substance, 18 workplace monitoring substances and ten special health diagnosis substances regulated by ISHA. For CSCA, nine poisonous substances, six substances requiring preparation for accidents and one restricted substance were identified. Conclusions: Based on these findings, formaldehyde was identified as one of the chemicals that should most strictly be controlled for the protection of the health of nail technicians and customers. At the same time, it is necessary to distribute materials with detailed hazardous information of nail care products for nail shop technicians.
Method Development for Estimating Concentration of Airborne Fungi Using a Thermal Imaging Camera
Kim, Ki Youn ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 465~471
DOI : 10.15269/JKSOEH.2015.25.4.465
Objectives: An objective of this study is to apply a thermal image camera which shows various color according to temperature of indoor surface for estimating concentration of airborne fungi. Materials and Methods: While wall temperature were monitored by applying the thermal image camera, airborne bacteria as well as air temperature and relative humidity have been measured in lecture room and toilet of university for seven months. Results: Based on the results obtained from this study, the ranges of temperature and airborne fungi concentration were
for red image,
for orange image,
for sky-blue image, and
for blue image, respectively. The color of indoor surface taken shot by thermal image camera showed consistent trend with temperature of indoor surface. There is, however, little correlation between color of indoor surface and airborne fungi concentration(p>0.05). Among environmental factors, relative humidity in indoor air showed a significant relationship with airborne fungi concentration(p<0.05). Conclusions: The more measurement data for proving statistically an association between color of indoor surface and airborne fungi concentration should be provided to easily estimate indoor level of airborne fungi.
A Study on the Total, Particle Size-Selective Mass Concentration of Airborne Manganese, and Blood Manganese Concentration of Welders in a Shipbuilding Yard
Park, Jong Su ; Kim, Pan Gyi ; Jeong, Jee Yeon ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 472~481
DOI : 10.15269/JKSOEH.2015.25.4.472
Objectives: Welding is a major task in shipbuilding yards that generates welding fumes. A significant amount of welding in shipbuilding yards is done on steel. Inevitably, manganese is present in the base metals being joined and the filler wire being used and, consequently, in the fumes to which workers are exposed. The objective of this work was to characterize manganese exposure associated with work area, total and particle size-selective mass concentration, and compare the mass concentrations obtained using a three-piece cassette sampler, size-selective impactor sampler and blood manganese concentrations. Materials: All samples were collected from the main work areas at one shipbuilding yard. We used a three piece cassette sampler and the eight stage cascade impactor sampler for the airborne manganese mass concentration of total and all size fractions, respectively. In addition, we used the results of health examination of workers sampled for airborne manganese. Results: The oder of high concentration of airborne manganese in shipbuilding processes was as follows; block assembly, block erection, outfitting installation, steel cutting, and outfitting preparation. The percentages of samples that exceeded the OES of the ministry of employment and labor by the cassette sampling method was 12.5%, however 59.1% of sampled workers by the impactor sampling method exceeded the TLV of the ACGIH. Conclusions: Even though the manganese concentrations in blood of workers exposed to higher airborne manganese concentration were higher than among those exposed to lower concentrations, there was no difference in blood manganese concentrations among work duration. The data analyzed here by characterizing size-selective mass concentrations indicates that the inhaled manganese of welders in shipbuilding yards could be mostly manganese-containing respirable particle sizes.
The Adoption of Risk Assessment Methodology in Exposure Assessment
Kim, Seung Won ; Choi, Sangjun ; Phee, Young Gyu ; Kim, Kab Bae ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 482~492
DOI : 10.15269/JKSOEH.2015.25.4.482
Objectives: Exposure Assessment for workplace hazards where the exposure level is below occupational exposure limits(OELs) has been performed without considering either the degrees of risk or exposure levels and has failed to lead to intervention in many cases. The objective of this study was to suggest and test an application framework for risk assessment methodology under the current exposure assessment system in Korea. Materials: First, we investigated the exposure assessment systems in Korea and other countries. To adopt some risk assessment techniques, we also analyzed risk assessment systems and compared them to exposure assessment systems. A few suggestions were made. We held a public hearing during an industrial hygiene conference and took surveys using a questionnaire. Results: The first suggestion was to implement the risk assessment and exposure assessment through a "one-stop" system. In that case, one expected question would be who has been doing the jobs so far. In most cases, industrial hygiene consulting services or laboratories have been performing exposure assessment for business owners. Business owners are required to perform risk assessment. As two different groups of people will be required to implement two things in a one-stop system, they need to share information. As an information vehicle to share information, commonly filed survey checklists were suggested. The second suggestion was to categorize exposure level into four groups instead of the current binary divisions based on OELs. In the risk assessment system, exposure level is divided into four groups utilizing the cut-points of 10%, 50%, and 100% of OELs. The same schema can be adopted in the exposure assessment system and different levels of requirements can be assigned for each group. The third suggestion was regarding the regulation system. To provide the suggestions some thrust toward being implemented in the field, changes should be made in the legal system. Two different types of new exposure assessment result reporting forms were suggested. Some investigations such as an ergonomic survey are officially accepted as risk assessment under the current legal system. A few items were suggested to be included in the exposure assessment result reporting to be accepted as risk assessment. A pilot study in two small factories was performed and pointed out the strengths and weakness of our suggestions. Conclusions: Discussions and studies on the improvement of the exposure assessment system have been held for decades and no tangible changes have yet been made. We hope this result can help realize healthy lives for workers in Korea.
Effects of Factors Associated with Urine Hippuric Acid Correction Values in Urinary Creatinine by HPLC and Jaffe Method and Specific Gravity HPLC Jaffe Method
Kim, Key-Young ; Kim, Jong-Gyu ; Yoon, Ki-Nam ; Park, Wha-Me ; Park, Hun-Hee ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 493~505
DOI : 10.15269/JKSOEH.2015.25.4.493
Objectives: The purpose of this study was to evaluate the relevance of adjusting a urinary sample for urine hippuric correction value and its effects. Urinary biological monitoring data are typically adjusted to a constant creatinine and specific gravity concentration to correct for variable dilutions among spot samples. This study was conducted to evaluate the suitability of adjusting the urinary concentrations of urine creatinine and specific gravity(SG). Methods: We measured the concentrations of hippuric acid, in spot urine samples collected from control(119), case(120) individuals. The value of hippuric acid was adjusted by SG and urinary creatinine(HPLC & Jaffe). Results: The major results were as follows. The concentrations of urinary creatinine and SG for the control group were 1.84 g/L(SD 0.99) for arithmetic mean and 1.56 g/L(GSD 1.86) for geometric mean by HPLC method, 1.57 g/L (SD, 0.82) for arithmetic mean and 1.33 g/L(GSD 1.85) for geometric mean by Jaffe method, 1.028(SD 0.09) for arithmetic mean and 1.02(GSD 1.06) for geometric mean by refractometer. Hippuric acid levels were 0.40 g/L(SD 0.51) by arithmetic mean and 0.20 g/L(GSD 3.59). In that case the exposed group was 1.40 g/L(SD 0.58) for arithmetic mean and 1.28 g/L(GSD 1.55) for geometric mean by HPLC method, 1.27 g/L(SD 0.56) for arithmetic mean and 1.14 g/L(GSD 1.62) for geometric mean by Jaffe method, 1.045 L(SD 0.27) for arithmetic mean and 1.02(GSD 1.13) for geometric mean by refractometer(P<0.05). Hippuric acid levels were 0.67 g/L(SD 0.79) for arithmetic mean and 0.39 g/L(GSD 2.94)(p<0.05). The urine creatinine concentrations were affected by gender(p < 0.01) but SG levels were not affected by gender or age(p>0.05). After adjustment, urine hippuric acid was correlated with creatinine(HPLC & Jaffe)(r=0.723, P<0.05, r=0.708, P<0.05) and SG(r=0.936, P<0.05) and the control group shows significantly higher than the case group. In the case group for adjusted urine hippuric acid was correlated with creatinine(HPLC & Jaffe), (r=0.736, P<0.05), r=0.549, P<0.05), SG(r=0.549, P<0.05). After adjusting urine hippuric acid by urine creatinine(HPLC and Jaffe method) and specific gravity, significant associations were found between the control group and case group, respectively(r=0.832, P<0.05, r=0.845, P<0.05) and (r=0.841, P<0.05, r=0.849, P<0.05). Specific gravity adjustment appears to be more appropriate for variations in the urine creatinine method. Conclusion: we found that urinary creatinine concentrations were significantly affected by gender, and other factors and that care should therefore be exercised when correcting urinary metabolites according to the urinary creatinine concentration in spot urine. It is determined that additional study is needed for biological monitoring.
Hazard Communication of Dental Materials for Dental Hygienists in Daegu or Gyeongsangbuk-do Province Area
Kim, Haekyoung ; Choi, Sangjun ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 506~515
DOI : 10.15269/JKSOEH.2015.25.4.506
Objectives: This study was conducted to evaluate the status of hazard communication regarding dental materials among dental hygienists in the Daegu Metropolitan City and the North Gyeongsang-do Province area. Materials: A total of 310 dental hygienists were surveyed using self-administered questionnaires to investigate the status of hazard communication on dental materials and information needs. We collected instructions for use and material safety data sheets(MSDSs) for 67 dental materials frequently used at dental hospitals located in the Daegu Metropolitan City and the North Gyeongsang-do Province area. Results: The questionnaire surveys showed that only 11% of the 310 dental hygienists had knowledge of MSDS and 46.8% of respondents never read instructions for use before using materials. Just 7.4% of dental hygienists have undergone training on hazard information for dental materials. In particular, dental hygienists working at dental clinics had significantly lower response rates on knowledge of MSDS(p<0.001), reading of instructions for use(p=0.042) and training on the hazard information of dental materials(p=0.004) than those in dental hospitals or general hospitals. The essential information most desired by dental hygienists was hazard identification(82.3%) followed by first-aid measures(53.9%), handling and storage(51%), disposal considerations (49%) and toxicological information(47.1%). All dental materials were on foreign products which came from Japan(59.7%), the USA(26.9%) and Liechtenstein(13.7%). In terms of usage, 56.7% of dental materials were prosthetic, followed by conservation(31.3%), orthodontics(9%), and prevention(3%). We found that dental hygienists had accessed MSDSs for only five dental products among the 67 dental materials. The instructions for the use of the 67 dental materials provided hazard identification(64.2%), first-aid measures(83.6%), handling and storage(97%), disposal considerations(20.9%) and toxicological information(26.9%). Conclusions: Based on the results of this study, the hazard communication system for dental hygienists working at dental clinics should be improved.
Knowledge, Awareness and Health Risk Concerns on Occupational Exposure to Radiation among Firefighters in Korea
Lee, Hyeongyeong ; Yoon, Hyeongwan ; Park, Jeongim ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 516~524
DOI : 10.15269/JKSOEH.2015.25.4.516
Objectives: This study aims to investigate the current status of knowledge, awareness and health risk concerns on occupational radiation exposures among firefighters in Korea. The results will provide basic information for developing a prevention program to minimize adverse health effects relating to radiation exposure among firefighters. Methods: A questionnaire was composed of general characteristics of participants, and their knowledge, awareness, health risk concerns relating to occupational radiation exposure. It was distributed by email to all of 307 firefighters in Jeollabukdo in April 2014 and 259 of them (response rate 84.3%) were responded. Answers were analyzed for descriptive statistics including frequencies and percentages. SPSS/WIN 18.0 program was utilized for statistical analysis of t-test, ANOVA and Pearson's correlation. Results: The average score of radiation protection knowledge was
) out of 10. The score of awareness and health risk concerns on radiation exposure were 4.27, 3.94 out of 5, respectively. The results indicated that the knowledge on the characteristics of radiation was marginal among the firefighters, while the awareness and health risk concerns relating to radiation exposures were relatively higher comparing to other professions. Conclusions: Knowing the characteristics of potential risks is the first step for minimizing the adverse health effects relating to the risks. Therefore, it is necessary to provide adequate training and information on radiation and exposure protection methods for firefighters.
Factors Associated With Obstructive Pattern Spirometry In Shipyard Workers
Kim, Jahyun ; Kim, Young Wook ; Chae, Chang Ho ; Son, Jun Seok ; Kim, Chan Woo ; Lee, Jun Ho ; Park, Hyung Wook ; Cho, Byung Mann ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 525~533
DOI : 10.15269/JKSOEH.2015.25.4.525
Objectives: Alongside smoking, occupational exposure is an important risk factor for chronic obstructive pulmonary disease. The purpose of this study was to evaluate factors associated with occupational pulmonary function decline that can be used to create guidelines for the health management of shipyard workers Materials: This study analyzed spirometry from 10,597 male shipbuilding workers. Functional decline in spirometry was defined as FEV1/FVC <70% and logistic regression for work duration and occupational hazard exposure was performed Results: Among the subjects, 4.2% showed an obstructive pattern in pulmonary function. The odds ratios for hazard exposure were 1.67(indirect) and 3.54(direct), and for work duration 1.97(10-18 years), 2.29(19-27), and 5.02(28+). After adjusting for smoking and work-related factors, the odds ratios for work durations of over 10 years were 1.73(10-18 years), 1.99(19-27), and 4.09(28+), but for hazards exposure was 1.71(direct) alone after adjustment. Conclusions: Occupational COPD is insidious and chronic, and thus long-term hazard exposed(especially over 10 years) shipyard workers with functional decline in spirometry need to prevent and manage COPD. This study is important for establishing guidelines to manage hazard exposure among shipyard workers and prevent COPD.
MCS/IEI Prevalence Rate of Workers Around an Accidental Release of Hydrogen Fluoride in Gumi Industrial Complex
Han, Hye-Ji ; Woo, Kuck-Hyeun ; Choi, Sung-Yong ; Jeon, Byoung-Hak ; Choi, Sangjun ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 534~541
DOI : 10.15269/JKSOEH.2015.25.4.534
Objectives: This study was conducted to evaluate the prevalence rate of multiple chemical sensitivity/idiopathic environmental intolerance(MCS/IEI) among workers in the Gumi industrial complex around the region of accidental release of hydrogen fluoride in 2012. Materials: We evaluated MCS/IEI using the Korean version of the Quick Environmental Exposure and Sensitivity Inventory(QEESI). A total of 535 workers at six manufacturing companies in the Gumi industrial complex were investigated using self-administered questionnaires from February to March 2015. After exclusion of incompletely answered questionnaires, 271 were analyzed. Results: The prevalence rate and proved positive rate of MCS/IEI were 5.9%(16 out of 271) and 3.7%(10 out of 271), respectively. The scores of chemical intolerance, other intolerance, symptom severity and life impact were significantly higher(p<0.05) in females than those of males. In terms of masking index scores, males showed significantly higher(p=0.003) than female. The self-reported MCS/IEI prevalence rate, 7.7%, of workers exposed to hydrogen fluoride in 2012 was higher than no-exposure group(5.6%), but not statistically significant(p=0.815). Conclusions: Although the prevalence rate of MCS/IEI symptoms of workers exposed to hydrogen fluoride gas in 2012 was not significantly higher than no-exposure group, it is necessary to conduct follow-up study on the exposure group of hydrogen fluoride.
Experimental Study on Optimum Pulse Jet Cleaning Conditions of a Cartridge Filter System
Piao, Cheng Xu ; Ha, Hyun Chul ; Kim, Sung Joon ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 542~553
DOI : 10.15269/JKSOEH.2015.25.4.542
Objectives: Many types of dust collector are used for industrial ventilation, with the most common types being the cylinder bag filter system, rectangular bag filter system and cylinder type cartridge filter system. The cylinder type cartridge bag filter, which has more filtering area than other types of bag filter, can increase the pulse time and extend the useful life of the filter. This can save operational costs and installation area. Materials: This study used cylinder type cartridge bag filter equipment and tested the impact of vibration level and filter pressure with different pulse jet cleaning conditions. The final, cleaning efficiency was calculated through input dust mass and cleaning dust mass Conclusions: Two optimum cleaning condition groups were found. The first condition group was
pulse pressure, 15 cm pulse distance, 0.2 s pulse time with an H-10 type nozzle. The second condition group was
pulse pressure, 15 cm pulse distance, 0.3 s pulse time with an H-10 type nozzle.
A Study on Factors Related to Grip and Pinch Strength among Estheticians
Kim, Jeong Hwa ; Phee, Young Gyu ; Lee, Sa-Woo ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 554~565
DOI : 10.15269/JKSOEH.2015.25.4.554
Objectives: The purpose of this study was to measure estheticians' grip and pinch strength in the hand parts and identify related factors according to general characteristics. Methods: A Jamar dynamometer was used to measure grip strength and a Jamar pinch gauge was used to measure tip, palmar and lateral pinch strength. General data were collected through a questionnaire survey among 116 estheticians from 31 skin care centers and spas. Results: The subjects' mean grip strength was 23.95 kgf for the right hand and 23.42 kgf for the left hand with the dominant right hand recording slightly higher mean grip strength. Their mean pinch strength was the highest with lateral pinch(right 4.89 kgf, left 4.69 kgf), which was followed by palmar pinch(right 3.77 kgf, left 3.88 kgf) and tip pinch(right 2.29 kgf, left 2.25 kgf), in that order. Conclusions: The grip and pinch strength of the hand parts was high when estheticians' commonly used both hands for massage instead of just one. The use of both hands is recommended to protect the hand parts during massage.
The Change of Sleep Quality after Transition to Consecutive Day Shift from Day and Night Shift: A Motor Assembly Factory Case
Song, Hansoo ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 566~572
DOI : 10.15269/JKSOEH.2015.25.4.566
Objectives: The major objective of this study was to analyze insomnia after the change to consecutive day shift from day and night shift in a motor assembly factory. Materials: Data were collected at before and after shift system change through a survey conducted by a labor union. We analyzed transition of PSQI(Pittsburgh Sleep Quality Index) among 222 workers by separating the day shift week and night shift week. The cut-off point of insomnia was 8.5 on the PSQI. Results: Mean PSQI in the day shift week significantly did not decrease, going from
(p=0.612 by paired t-test), Mean PSQI for night shift week significantly decreased from
(p<0.001 by paired t-test). However, mean PSQI in the day shift week increased from
years(p=0.085, by repeated measured ANOVA). Mean PSQI score in the night shift week improved more in the married group(from
) than in the non-married group(from
)(p=0.038, by repeated measured ANOVA). Conclusions: The change to consecutive day shift improved insomnia in night shift. However, insomnia in the day shift week was worsened among those more than 50 years old.
For 5-years the Longitudinal Study on the Effect of Noise Exposure and Aging to the Changes of Hearing Threshold Level
Chae, Chang Ho ; Kim, Ja Hyun ; Son, Jun Seok ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 573~583
DOI : 10.15269/JKSOEH.2015.25.4.573
Objectives: This study was carried out to evaluate the effect of noise exposure and aging on changes in hearing threshold level and the relationship between age and noise. Materials: The author selected 274 male shipyard and assembly line workers as the noise exposed group and 582 males not exposed to noise as the general population group. Data were collected from five years of consecutive annual audiometric tests performed from 2008 to 2012. Results: In the general population and noise exposed groups, there was a reverse phenomenon that hearing threshold level for 2009 was lower than that of 2008, which seemed to be due to the learning effect, but from 2010 hearing threshold level increased. In the noise exposed group, the mean hearing threshold level in the left ear was significantly higher than that for right ear. In the general population group, the older was the age, the higher was the hearing threshold level, especially at 4000 Hz. In the general population and noise exposed groups, frequency, age group and noise exposure independently affected hearing threshold level, and there was no relationship between age and noise exposure. Over all frequencies, the change of hearing threshold level was larger in the noise exposed group than in the general population group. In the noise exposed group below thirty years old, the change at 4000 Hz was remarkable. Conclusions: Age and noise exposure seem to affect hearing threshold level independently and contribute to an additive effect on hearing threshold level.
Exposure Assessment of Airborne Quartz from Earthwork Sites
Sung, Eun Chang ; Bae, Hye Jeong ; Jung, Jong-Hyoen ; Phee, Young Gyu ;
Journal of Korean Society of Occupational and Environmental Hygiene, volume 25, issue 4, 2015, Pages 584~590
DOI : 10.15269/JKSOEH.2015.25.4.584
Objectives: The purpose of this study was to evaluate quartz concentrations in airborne total and respirable dusts. Materials: Respirable dust samples were collected using a 10 mm aluminum cyclone equipped with a 37 mm
pore size PVC filter. Total dust samples were collected with a three stage cassette from three work sections at earthwork sites located in the South Chungcheong-do Province area. Results: The geometric means of quartz concentrations were
in total dust and respirable dust, respectively. The geometric means of quartz contents analyzed by FTIR were 3.74% in total dust and 3.16% in respirable dust. The geometric mean of quartz concentrations and contents in secondary blasting operations were higher than those in other operations. Conclusions: Given that secondary blasting operations had higher quartz concentrations, there is a need to reduce respirable dust, such as through wet operations.