饮用水中硒的形态分析——2,3-二氨基萘光度法测定硒(Ⅳ)、硒(Ⅵ)及总硒含量

Study on the Speciation Analysis of Selenium in Potable Water Determination of the Se(), Se() and Total Selenium Content with 2,3Diaminonaphthalene(DAN) Spectrometry

应用２，３－二氨基萘（ＤＡＮ）对硒（Ⅳ）的选择性反应，生成的４，５－苯并苤硒脑经甲苯萃取，用分光光度法测定其吸光度，以研究饮用水中硒的存在形态。水样用ＨＮＯ３－ＨＣｌＯ４（５∶２）消化，将硒（Ⅱ）、硒（０）氧化为硒（Ⅵ）。用ＨＢｒ作还原剂，将硒（Ⅵ）还原为硒（Ⅳ），然后进行测定，用差减法求得硒（Ⅳ）、硒（Ⅵ）及总硒的含量。

The method on the speciation analysis of Selenium in potable water by means of the selective reaction of only Se () with 2,3diaminonaphthalene(DAN) and determining the absorbency of resultant extracted with toluene was studied. After the potable water sample was digested with HNO3HClO4(52) and reduced with HBr, Se() and Se(0) were oxidized to Se() and Se() was reduced to Se(), then determining the content of Se(), Se() and total Selenium respectively with DAN spectrometry and differential method.