Simultaneous Determination of Ultra trace Level of As,Sb,Bi,Ge,Sn and Hg in Coastal and Estuarine Seawater by Chemical Vapor Generation and Inductively Coupled Plasma Mass Spectrometry

KeyWord:chemical vapor generation  inductively coupled plasma mass spectrometry  coastal and estuarine seawater  ultra-trace level  element

Abstract:

      A chemical vapor generation£¨CVG£© and inductively coupled plasma mass spectrometric £¨ICP MS£© method was proposed for the simultaneous determination of ultra-trace level of As,Sb,Bi,Ge,Sn,and Hg in coastal and estuarine seawater.Effects of operating parameters,including concentrations of KBH4,HCl and thiourea,pump flow rate and carrier gas flow rate on analytical performance were studied.The results showed that good signal to noise£¨S/N£© ratios for all the analysed elements were obtained when 0.70% HCl,0.10 g/L thiourea,11.0 g/L KBH4,and 0.40 L/min carrier gas were used in the CVG procedure.The relative standard deviations£¨RSDs,n=5£© for 0.10 ¦Ìg/L spiked sample were in the range of 3.9%-8.9%.The spiked recoveries for the seawater samples were between 89% and 112%.The method blanks were in the range of 0.012-0.036 ¦Ìg/L.The limits of quantitation£¨LOQs,10¦Ò£© for the developed method were obtained between 0.006 7 ¦Ìg/L and 0.026 ¦Ìg/L.The method could be applied in the simultaneous determination of As,Sb,Bi,Ge,Sn and Hg in coastal and estuarine seawater.