In-situ zinc content measuring method for inferior internal combustion engine oil

Application Number: 00115009
Application Date: 2000.03.21
Publication Number: 1265468
Publication Date: 2000.09.06
Priority Information:
International: G01N31/22
Applicant(s) Name: Shanghai Jiaotong Univ.
Inventor(s) Name: Chen Ming;Wang Chengtao;Tao Dehua
Patent Agency Code: 31201
Patent Agent: wang tilin
Abstract Based on that the zinc content is not less than 500ppm, the consumption of disodium complexonate solution is calculated by the formula X=6.538MV/G, where X is the limiting value of zinc content, M is the molar concentration of standard disodium complexonate solution, V is the volume of standard disodium complexonate solution in ml and G is sample weight ing. The standard disodium complexonate solution as well as extraction solvent and color reagent are filled into a test tube in advance, lubricant oil in fixed amount is dropped into the test tube, complexation between zinc in the sample and the standard disodium complexonate solution takes place and the zinc content is judged to bequalified or not through the color observation.