Determination of Cobalt in Urine by Graphite Furnace Atomic Absorption Spectrometry / 环境与健康杂志

ABSTRACT

Objective To develop a method for the determination of cobalt in urine by graphite furnace atomic absorption spectrometry(GFAAS).Methods Usingthe matrixmodifier tofind the best condition byimprovingthe cineration temperature and reducing the interference of gas phase in atomization stage.Results The best cineration temperature and atomization temperature was 1 200 ℃and 2 450 ℃respectively,taking15% PdCl2,NH3H2PO4 and HNO3 as the matrix modifier.The background absorb value was less than 0.05.The linear range was 0～75 ?g/L,the correlation coefficient was over 0.999,the average recovery rate was 97.2%,the relative standard deviations were 3.5%～6.5%,the detection limit was 1.5 ?g/L.The result of 16 urine samples determined with the present method showed no significant difference compared with that by using polarography.Conclusion This method is sensitive,accurate,simple and is applicable tothe determination ofcobalt in urine.