辽宁石油化工大学学报2011，Vol.31Issue(2)：17-19,49,4.DOI:10.3696/j.issn.1672-6952.2011.02.006
非完全消化-分光光度法测定润滑油中的钙
Noncomplete Digestion-Spectrophotometric Determination of Calcium in Lubricating Oil
沈春玉1
作者信息
- 1. 辽宁石油化工大学化学与材料科学学院,辽宁抚顺,113001
- 折叠
摘要
Abstract
The noncomplete digestion method was applied to the treatment of lubricating oil sample, i. e. the sample was digested in concentrated nitric acid, and then the product of the digested sample was dissolved in emulsifier Triton X -100 obtaining the homogeneous and transparent solution of the sample. Thus the noncomp1ete digestion—spectrophotometer method for determination of calcium in lubricating oil was established. The interference ions are masked by EDTA.Experimental conditions are carefully selected. The results show that in the presence of 5—Br—PADAP, emulsifier TritonX—100 and KH2PO4—NaOH, Ca reacts with 5—Br—PADAP to form a complex with maximum absorption wavelength at 555 nm. Under the optimum conditions Beers law is obeyed in the range of 0～20.0 tμg/mL of Ca with the correlative coefficient of 0. 999 6 and an apparent molar absorptive coefficient of 3.84 × 104 L/(moL · cm) The average recovery for Ca is 98.03 ％ (n =6) from model samples and 97.4 ％ ～102. 9％ in real lubricating oil case with precision of 2. 62％～3. 13％ RSD.关键词
钙/非离子表面活性剂/非完全消化法/分光光度法Key words
Calcium/ Non—ionic surfactant/ Noncomplete digestion methods/ spectrophotometry分类
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沈春玉..非完全消化-分光光度法测定润滑油中的钙[J].辽宁石油化工大学学报,2011,31(2):17-19,49,4.
