slt272-2001 水质 总硒的测定铁(ⅱ)--邻菲啰啉间接分光光度法

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1、SL中华人民共和国行业标准SL/T272-2001水质总硒的测定铁(川—邻菲哆琳间接分光光度法Waterquality-Determinationoftotalselenium-Iron(I)-O-phenanthrolineindirectspectrophotometry2001-09-11发布2001一12-01实施中华人民共和国水利部发布SL/T272-2001目次前言‘································，······，··········‘··································

2、······。········。。，⋯⋯1适用范围·························································································，··。··············。⋯2干扰及其消除·...........................................................................·············⋯⋯，·.·一3方法原理·················，·价·，。···········

3、···············。···········。·····。。····，·····。······。·············⋯⋯4试剂·························。····················································································⋯⋯5仪器设备··························。····，·····························。··························

4、···············⋯⋯6分析步骤...................................。········...........................................··‘，··⋯⋯7分析结果的计算......................................................................................................8精密度与准确度·........................................

5、......................................................⋯⋯9注意事项·························。。·······。·······，·····，·。·‘···············。。····························。····⋯⋯标准分享网www.bzfxw.comSL/T272-2001前言《水质总硒的测定铁(I)—邻菲哆琳间接分光光度法》SL/T272-2001的制定主要依据国家技术监督局发布的GB/Ti.1-1993《标准化工作导则》、国家

6、标准化组织ISO和国家有关水环境监测的技术标准以及国内外有关总硒测定的新成果。《总硒的测定》主要包括以下内容:—分析方法原理;—试剂的配制和仪器;一分析步骤;-—结果计算本标准由水利部水文局提出本标准由水利部水文局归口。本标准起草单位:黄河流域水环境监测中心。本标准主要起草人:李鸿业、袁丽华、冯荣周、李晃。SL/T272-2001水质总硒的测定铁(II)邻菲哆琳间接分光光度法适用范围本标准适用于地表水、地下水、生活污水和工业废水中总硒的测定。取50mL水样，硒的最低检出浓度为。.003mg/L,测定范围为0.01---0.2mg/L,2干扰及其消

7、除铜、铁、铝等金属离子的干扰可用EDTA消除。10倍的砷化物和20倍的硫化物不干扰硒的测定。3方法原理试样经硝酸一高氯酸混合酸(见4-8)加热消解后，各种形态的硒转化为硒(N)离子。在加热的条件下，盐酸定量地将硒(11)还原为硒(N)。在酸性介质中，硼氢化钾将硒(N)还原为硒化氢(H2Se)，同时硼氢化钾分解产生的氢气流将它带入吸收液中。硒化氢将吸收液中的铁(0)还原为铁(u)，使淡黄色的铁(1)一邻菲alp琳络合物转变为桔红色的铁(II)一邻菲哆琳络合物。后者生成量与试样中硒的浓度成正比。4试剂4.1试验用水:去离子水。4.2硝酸(HNO3):

8、pen=1.428/mL，优级纯。4.3盐酸(HCl):P2o=1.198/mL，优级纯。4.4高氯酸(HCL04):P2o=1.688