Determination of mercury in lead concentrate by Zeeman mercury analyzer with solid injection
Mercury in heavy metal concentrates could be discharged into environment,which will exacerbate ecological environment.Therefore,it is of great significance to determine mercury in lead concentrate.Af-ter 0.05-0.30 g of sample was weighed,it was burned at high temperature in air atmosphere by Zeeman mercury analyzer.Mercury was released and atomized with heat release temperature of 800 ℃ for 150 s,and then mercury vapor was introduced into the detector by air.The interference of sulfur in sample matrix was deducted based on Zeeman effect.The content of mercury was determined at wavelength of 253.7 nm.Thus,a determination method of mercury in lead concentrate was established.The results showed that the contents of mercury in range of 1-500 ng and 500-15 000 ng had a good linear relationship with their corre-sponding peak areas respectively,and the correlation coefficients were both 0.999 9.The limit of detection of this method was 0.24 ng,and the limit of quantification was 0.80 ng.The lead concentrate samples was determined according to the proposed method.The relative standard deviations(RSDs,n=11)of determi-nation results were between 1.2％and 5.0％,and the recoveries were between 85％and 114％.Atomic fluorescence spectrometry in GB/T 8152.11-2006 was used for method comparison,and the results of the two above methods were basically consistent.The proposed method adopted direct solid injection without sample pretreatment.The detection range was wider compared to the mercury enrichment mercury analy-zer.
lead concentratemercuryZeeman effectsolid injectionmercury analyzer
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