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Simultaneous Determination of Sulfur, Phosphorus, and Zine in Lubricating Oils by Microwave Digestion System and ICP-AES
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2001, v.14 no.4, pp.324-330
Cho,
S., Lim,
H., &
Lee,
S.
(2001). Simultaneous Determination of Sulfur, Phosphorus, and Zine in Lubricating Oils by Microwave Digestion System and ICP-AES. Analytical Science and Technology, 14(4), 324-330.
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Abstract
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.
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- lubricating oil, microwave digestion, ICP-AES
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