Determination of the Toxic Elements As, Cd, Hg and Pb in Food Grade Dimethicone by Inductively Coupled Plasma Mass Spectrometry
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Abstract:
A method of inductively coupled plasma mass spectrometry (ICP-MS) was established to determine As, Cd, Hg and Pb toxic elements in dimethicone after diluted by kerosene. The condensation and deposition of high concentrations of carbon in mass cone interface and ion lens, which will decrease the sensitivity of element analysis, can be avoided effectively by introducing O2 to plasma. The mass spectral interferences of polyatomic ions to As element were corrected by collision?reaction?cell and the matrix matching method was used to eliminate matrix interference. On the other hand, the memory effect of Hg was corrected by the addition of Au in sample solution and standard solution. The detection limit of As, Cd, Hg and Pb was 0.58, 0.16, 0.87, 0.12 ng/L, respectively, with a correlation coefficient higher than 0.9999. The recovery rate was 93.25%~102.70%, with a relative standard deviation less than 4.61%. These four toxic elements were all detected in practical analysis, and their content was very low, which had no harm to human body. The method can be applied for the quality control and safety evaluation of food grade dimethicone.
