Simultaneous Determination of Sulfur, Phosphorus, and Zine in Lubricating Oils by Microwave Digestion System and ICP-AES

마이크로파 분해장치와 유도결합 플라스마 원자방출분광법을 이용한 윤활유 시료 중 S, P 및 Zn의 동시 분석

  • Received : 2001.06.25
  • Published : 2001.08.25


For the analysis of S, P and Zn in lubricating oil, microwave digestion method was studied by using inductively coupled plasma-atomic emission spectrometry(ICP-AES). Lubricating oil was completely decomposed with nitric acid or a mixture of nitric acid and hydrogen peroxide using and closed microwave digestion system. Digestions are completed within 50 min, a factor of at least 3~4 times faster than for the conventional digestion. A gradual heating program operated by the pulsed mode was found suitable for decomposing the lubricating oil matrix safely. The proposed method of digestion gave relative standard deviations(RSD) less than 3% for the elements determined.