Determination of Trace Metal Elements in Toluene and Their Feature Analysis

KeyWord:toluene  trace metal elements  inductively coupled plasma mass spectrometry

Abstract:

      An inductively coupled plasma mass spectrometric(ICP-MS) method was established for the determination of trace metal elements,including V£¬Cr£¬Mn£¬Fe£¬Co£¬Ni£¬Cu£¬Zn£¬Ag£¬Cd and Pb in toluene.The toluene were dissolved in ethanol-water-nitric acid system.The organic sampling system and the internal standard element Re were used in this experiment.The experimental conditions,such as RF power£¬carrier gas£¬sampling depth£¬ethanol-water ratio and nitric acid concentration were optimized.The results showed that,under the optimal conditions,the detection limits for the most trace metal elements could reach up to ng /L level.The linear correlation of the method was preferable with correlation coefficient of 0.998 4-1.000.The relative standard deviation(n=3) was less than 8.0% and the relative error was not more than 10%.The toluenes from different factories were analyzed.Results indicated that the concentrations of trace metal elements in the toluenes were obvious different.Therefore,a new identification method for benzenes spilled in ocean was provided by feature analysis of metals in the benzene compounds.