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1、SL中華人民共和國行業(yè)標準SL/T272-2001水質總硒的測定鐵(川—鄰菲哆琳間接分光光度法Waterquality-Determinationoftotalselenium-Iron(I)-O-phenanthrolineindirectspectrophotometry2001-09-11發(fā)布2001一12-01實施中華人民共和國水利部發(fā)布SL/T272-2001目次前言‘································,······,··········‘························
2、················?!ぁぁぁぁぁぁぁ?。。,??1適用范圍·························································································,··。··············。?2干擾及其消除·...........................................................................·············??,·.·一3方法原理··············
3、···,·價·,?!ぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁ?。···········?!ぁぁぁぁぁ??!ぁぁぁ?,·····。······?!ぁぁぁぁぁぁぁぁぁぁぁぁ??4試劑·························?!ぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁ??5儀器設備··························。····,···························
4、··。·········································??6分析步驟...................................?!ぁぁぁぁぁぁぁ?..........................................··‘,··??7分析結果的計算......................................................................................................8精密度與準確度·.
5、.............................................................................................??9注意事項·························。。·······。·······,·····,·?!ぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁ??!ぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁ!ぁぁぁ??SL/T272-2001前言《水質總硒的測定鐵(I)—鄰菲哆琳間接分光光度法》SL/T272-2001的制定主要依據國家技
6、術監(jiān)督局發(fā)布的GB/Ti.1-1993《標準化工作導則》、國家標準化組織ISO和國家有關水環(huán)境監(jiān)測的技術標準以及國內外有關總硒測定的新成果?!犊偽臏y定》主要包括以下內容:—分析方法原理;—試劑的配制和儀器;一分析步驟;-—結果計算本標準由水利部水文局提出本標準由水利部水文局歸口。本標準起草單位:黃河流域水環(huán)境監(jiān)測中心。本標準主要起草人:李鴻業(yè)、袁麗華、馮榮周、李晃。SL/T272-2001水質總硒的測定鐵(I)鄰菲哆琳間接分光光度法適用范圍本標準適用于地表水、地下水、生活污水和工業(yè)廢水中總硒的測定。取50mL水樣,硒的最低檢
7、出濃度為。.003mg/L,測定范圍為0.01---0.2mg/L,2干擾及其消除銅、鐵、鋁等金屬離子的干擾可用EDTA消除。10倍的砷化物和20倍的硫化物不干擾硒的測定。3方法原理試樣經硝酸一高氯酸混合酸(見4-8)加熱消解后,各種形態(tài)的硒轉化為硒(N)離子。在加熱的條件下,鹽酸定量地將硒(11)還原為硒(N)。在酸性介質中,硼氫化鉀將硒(N)還原為硒化氫(H2Se),同時硼氫化鉀分解產生的氫氣流將它帶入吸收液中。硒化氫將吸收液中的鐵(0)還原為鐵(u),使淡黃色的鐵(1)一鄰菲alp琳絡合物轉變?yōu)榻奂t色的鐵(I)一鄰菲哆琳
8、絡合物。后者生成量與試樣中硒的濃度成正比。4試劑4.1試驗用水:去離子水。4.2硝酸(HNO3):pen=1.428/mL,優(yōu)級純。4.3鹽酸(HCl):P2o=1.198/mL,優(yōu)級純。4.4高氯酸(HCL04):P2o=1.688/mL,優(yōu)級純。4.5硫酸(H2SOO;P