• Title, Summary, Keyword: simultaneous determination

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Establishment of the Spectral Correction Matrix and Simultaneous Determination of Ion and Zic with 1-(6-Benzothiazolylazo)-2-Naphthol as Chromogenic Agent.

  • Geo, Hong Wen.;Li, Cheng Yu.;Ye, Qing Song.
    • Bulletin of the Korean Chemical Society
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    • v.22 no.6
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    • pp.565-569
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    • 2001
  • The spectral correction matrix has been established to study the simultaneous complextions between metals and a ligand, and it eliminated the mutual influence among the complexes. The two sensitive reations between iron(Ⅱ) and 1-(6-bromo-2-benzothiazolylazo)-2-naphthol(BBTAN) and zinc (Ⅱ) and BBTAN have been investigated and applied to the simultaneous determination of Zn and Fe at pH 8.5 in the presence of triton x-100. This method gave the simples determination of the characteristic constants of the complexes. For the analysis of natural water, foods and other samoles, the recoveries of Fe and Zn were between 92 and 109% and between 91 and 104%, and their relative standard deviations were less than 5.5 and 11%, respectively.

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Development of simultaneous determination of vitamin A and E in infant formula by micro-HPLC (Micro-HPLC를 이용한 조제분유 중 비타민 A.E 동시분석법 개발)

  • Yun I-Ran;Choi You-Jeong;Lee Min-Kwon;Jeong Myeong-Ho;Kim Byeong-Hun
    • Korean Journal of Veterinary Service
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    • v.29 no.3
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    • pp.339-346
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    • 2006
  • Semi-micro-HPLC using a column-switching technique was developed for simultaneous determination of vitamin A and E contents in infant formula. Vitamin A and E were extracted by PDA - HPLC with reversed phase column using organic solvent and their contents in Certified Reference Material (CRM) and infant formula were determined and compared with hydrolysis method and rapid extraction. Developed method has many advantages of simple and rapid sample preparation and simultaneous determination of vitamin A and E by micro-HPLC using reversed phase column.

Simultaneous Kinetic Spectrophotometric Determination of Sulfite and Sulfide Using Partial Least Squares (PLS) Regression

  • Afkhami, Abbas;Sarlak, Nahid;Zarei, Ali Reza;Madrakian, Tayyebeh
    • Bulletin of the Korean Chemical Society
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    • v.27 no.6
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    • pp.863-868
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    • 2006
  • The partial least squares (PLS-1) calibration model based on spectrophotometric measurement, for the simultaneous determination of sulfite and sulfide is described. This method is based on the difference between the rate of the reaction of sulfide and sulfite with Malachite Green in pH 7.0 buffer solution and at 25 ${^{\circ}C}$. The absorption kinetic profiles of the solutions were monitored by measuring the decrease in the absorbance of Malachite Green at 617 nm in the time range 10-180 s after initiation of the reactions with 2 s intervals. The experimental calibration matrix for partial least squares (PLS-1) calibration was designed with 24 samples. The cross-validation method was used for selecting the number of factors. The results showed that simultaneous determination could be performed in the range 0.030-1.5 and 0.030-1.2 $\mu$g m$L ^{-1}$ for sulfite and sulfide, respectively. The proposed method was successfully applied to simultaneous determination of sulfite and sulfide in water samples and whole human blood.

Simultaneous Determination of Anions and Cations in Natural Water by Ion-exclusion/Cation-exchange Chromatography with a Weakly Acidic Cation-exchange Resin Column

  • Lee, Kwang-Pill;Choi, Seong-Ho;Park, Yu-Chul;Bae, Zun-Ung;Lee, Mu-Sang;Lee, Sang-Hak;Chang, Hye-Yong;Kwon, Se-Mok;Kazuhiko Tanaka
    • Bulletin of the Korean Chemical Society
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    • v.24 no.9
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    • pp.1324-1328
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    • 2003
  • The simultaneous determination of anions ($SO_4 ^{2-},\;Cl^-,\;and\;NO_3^-$) and cations ($Na^+,\;NH^{4+},\;K^+,\;Mg^{2+},\;and\;Ca^{2+}$) in natural water obtained by Nakdong River waters system in Korea were performed by ion-exclusion/cationexchange chromatography with conductimetric detection. The stationary phase was a polymethacrylate-based weakly acidic cation-exchange resin column in the $H^+$-form and a weak-acid eluent. When using only a 1.4 mM sulfosalicylic acid/6 mM 18-crown-6 ether as an eluent, good resolution of both anions and cations, minimum time required for the separation, and satisfactory detection sensitivity were obtained in a reasonable time. The method was successfully applied to the simultaneous determination of anions and cations in natural waters.

Studies on the Simultaneous Determination of VNA and TSNA by GC - TEA (Gas chromatography-Thermal Energy Analyzer에 의한 휘발성 니트로소아민과 담배 특유의 니트로소아민들의 동시 분석연구)

  • Rhee, Mun-Su;Ji, Sang-Woon;Park, Yang-Su
    • Journal of the Korean Society of Tobacco Science
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    • v.15 no.2
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    • pp.174-184
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    • 1993
  • This is to investigate the methodology for the simultaneous determination of Wk, mk and TSNA using gas chromatography(GC) in combination with chemiluminescence detector, thermal energy analyzer(TEA) . The simultaneous analysis has been estimated by evaluating tobacco. The TEA was linked to GC equipped with non -polar SPB -5 fused silica capillary column which was introduced into the ceramic pyrolysis tube by the point of 16cm from the end of TEA. Quantification was carried out by internal standardization with WDPA after calibration of retention times and response factors with authentic nitrosoamines. It was demonstrated that WDPA was most preferable as internal standard for the simultaneous analysis. The recoveries of the internal standard were in the range of 83∼96% . Nitrosoamines in this method were detected with determination limit of 0.1ng and was made by a straight line in calibration curve by TEA response. The suitability of nitrosoamines extraction in tobacco leaf was investigated. It was most suitable to extract nitrosoamines from tobacco leaves with 0.01 M NaOH within a period of 8 hours. Thimerosal as an antibacterial agent was added to NaOH solution to prevent artifactual formation. The fractionation and the purification of nitrosoamines form alkaline extracts were conveniently performed using Extrelut multilayer column and dichloromethane. Reproducible and reliable results were obtained for the determination of nitrosamines in a relatively short time compared to previous known method. TSNA contents in burley were about 4 times higher as those in the fluecured tobacco.

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Simultaneous Derivative Spectrophotometric Determination of Levodopa and Carbidopa in Pharmaceutical Preparations

  • Madrakian, T.;Afkhami, A.;Borazjani, M.;Bahram, M.
    • Bulletin of the Korean Chemical Society
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    • v.25 no.12
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    • pp.1764-1768
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    • 2004
  • The present work reports on the investigations based on the interaction of sodium hydroxide with catechol derivatives. The first derivative spectra allowed the simultaneous determination of levodopa and carbidopa. The calibration graph was constructed from the first derivative signals by measuring $^1D$ at 350 nm for standard samples containing between 3 and 30 mg $L^{-1}$ of levodopa and at 305 nm for standard samples containing between 3 and 80 mg $L^{-1}$ of carbidopa. This method offers the advantages of simplicity, rapidity, selectivity and higher sensitivity than most of the existing spectophotometric methods.

Simultaneous Determination of Alkaline Earth Metal Ions by a Conventional High Performance Liquid Chromatographic System

  • Rho, Young-Soo;Choi, Seung-Gi
    • Archives of Pharmacal Research
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    • v.9 no.4
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    • pp.211-214
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    • 1986
  • A simultaneous determination method of alkaline earth metals was attempted with the conventional high performance liquid chromatographic system. Four cations, namely, magnesium, calcium, strontium and barium ion, were injected directly as aqueous solution into an eluent containing copper chloride solution and and were successfully separated and determined on a separating column (Zipax SCX, 4.6 mm i.d. ${\times}25$ cm length, Du Pont, USA) by using a variable wavelength UV detector. The linear calibration curves were obtianed in the range from $1.0{\times}10^{-4}M$ to $5.0{\times}10^{-4}M$ and the correlation coefficient of the calibration curve for each metal of magnesium and calcium in tap water. Alkaline earth metals were determined with the conventional high performance liquid chromatographic system.

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The Simultaneous Extraction and Determination of Trace Copper and Zinc in Solvent Extraction (용매추출법에 의한 토양중의 미량 구리와 아연원소의 동시추출 및 정량에 관한 연구)

  • 정창웅;지석주;박종안
    • Journal of Environmental Health Sciences
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    • v.21 no.3
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    • pp.87-95
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    • 1995
  • A rapid and selective co-extraction systems of copper and zinc-thiocyanate complex into various types of alkylamine for the simultaneous determination of two metal ions by atomic absorption spectrometry and ion chromatograph have been proposed. The quantitative extractions of Cu(II) and Zn(II) at 0.1 M-thiocyanate and 0.1 M-HCI were achieved with Aliquat 336-$CHCl_3$. The detection limits of Cu and Zn were 2 ppb and 0.9 ppb respectively.

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Simultaneous Determination of Cinnamaldehyde and Coumarin in Oryeong-san using HPLC with Photodiode Array Detector

  • Seo, Chang-Seob;Shin, Hyeun-Kyoo
    • Herbal Formula Science
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    • v.18 no.2
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    • pp.251-257
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    • 2010
  • Objectives : To develop and validate High-performance liquid chromatography-photodiode array methods for simultaneous determination of two constituents in Oryeong-san(ORS). Methods : Reverse-phase chromatography using a Gemini C18 column operating at $40^{\circ}C$, and photodiode array(PDA) detection at 280 nm, were used for quantification of the two marker components of ORS. The mobile phase using a gradient flow consisted of two solvent systems. Solvent A was $H_2O$ and solvent B was acetonitrile. Results : Calibration curves were acquired with correlation coefficient ($r^2$)>0.9999, and the relative standard deviation(RSD) values(%) for intra- and inter-day precision were not exceed 1.0%. The recovery rate of each compound was in the range of 93.01-104.16%, with an RSD less than 2.0%. The contents of two compounds in ORS were 1.10-3.72 mg/g. Conclusions : The established HPLC method will be helpful to improve quality control of ORS.