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文中提出用巯基棉富集-悬汞电极示差脉冲溶出伏安法测定海水中溶解态Se(Ⅳ)和Se(Ⅵ).在0.3NHCl介质中,Se(Ⅳ)定量被巯基棉吸附,而后用HNO_3 Mg(NO_3)_2消化法解吸.测定底液为MgCl_2-HCl(含微量Cu(Ⅱ)),PH～1.∑Se和Se(Ⅳ)的检测限分别为0.01ppb和0.009ppb(200ml海水),对∑Se含量和Se(Ⅳ)含量分别为0.45ppb和O.033ppb的海水样品,六次平行测定的变异系数分别为4.4％和3.0％,平均回收率分别为102％和96％.用本法测定厦门近岸表层海水,Se(Ⅳ)含量为0.01—0.03ppb,Se(Ⅵ)含量为0.03—0.06ppb,Se(Ⅳ)/Se(Ⅵ)比值约为0.2—0.8.九龙江河口∑Se大致是保守行为,而Se(Ⅳ)则是非保守的.
In this paper, Se (Ⅳ) and Se (Ⅵ) in sea water were determined by differential pulse stripping voltammetry using mercapto cotton enrichment-suspend mercury electrode. In Sepharose (0.3NHCl) The detection limit of PH to 1.ΣSe and Se (Ⅳ) were 0.01 ppb and 0.009 ppb (200 ml seawater respectively) with MgCl 2 -HCl (containing trace Cu (Ⅱ)) and HNO_3 Mg (NO_3) ). For the seawater samples with ΣSe and Se (Ⅳ) contents of 0.45 ppb and 0.033 ppb respectively, the coefficients of variation of six parallel determinations were 4.4% and 3.0%, respectively. The average recoveries were 102% and 96%, respectively. Se (Ⅳ) is 0.01-0.03ppb, Se (Ⅵ) is 0.03-0.06ppb, Se (Ⅳ) / Se (Ⅵ) is about 0.2-0.8, ΣSe estuary estuary is generally conservative behavior, while Se (Ⅳ) is non-conservative.