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SELENIUM Method 270.3 (Atomic Absorption, gaseous hydride) STORET NO. Total 01147 Dissolved 01145 Suspended 01146 1 Scope and ApphcatiOn l I T h e gaseous hydnde method determmes morgamc selemum when present m concentratiOnsatorabove2ug/l ThemethodISapphcabletodnnkmgwaterandmost fresh and sahne waters, m the absence of hIgh concentratiOns of chromIUm, cobalt, copper, mercury, molybdenum, mckel and sIlver 2 Summary of Method 21 Selemum m the sample IS reduced from the +6 oXIdatiOn state to the +4 oXIdatiOn state by the addItiOn of SnClz Zmc IS added to the aCIdIfied sample, producmg hydrogen and convertmg the selemum to the hydnde, SeHz The gaseous selemum hydnde IS swept mto an argon-hydrogen flame of an atomIC absorptiOn spectrophotometer The workmg range ofthe method IS 2-20 ug/l usmg the 196 0 nm wavelength 3 Comments 31 In analyzmg dnnkmg water and most surface and ground waters, mterferences are rarely encountered Industnal waste samples should be spIked WIth a known amount of selemum to estabhsh adequate recovery 32 Orgamc forms of selemum must be converted to an morgamc form and orgamc matter mustbeOXIdIzedbeforebegmmngtheanalysIs TheOXIdatiOnproceduregIvenmmethod 206 5 (Standard Methods, 14th Ed 404B, p 285, Procedure 4 1) should be used 33 For sample handlmg and preservatIon, see part 4 1 of the AtomIC AbsorptiOn Methods sectiOn ofthIS manual 34 For quahty control reqUIrements and optiOnal recommendatIons for use m dnnkmg water analyses, see part 10 ofthe AtomIC AbsorptiOn Methods sectiOn ofthIS manual 35 Data to be entered mto STORET must be reported as ug/l 4 PreCIsiOn and Accuracy 4 1 Ten rephcate solutiOns of selemum OXIde at the 5, 10 and 15 ug/l1evel were analyzed by a smgle laboratory Standard deVIatIons at these levels were ±O 6, ±1 1 and ±2 9 WIth recovenes of 100, 100 and 101% (Caldwell, J S, Lishka, R J, and McFarren, E F , "EvaluatIon ofa Low-Cost Arsemc and Selemum DetermmatiOn at MIcrogram per LIter Levels",JAWWA,vol65,p 731,Nov 1973) Approved for NPDES and SDWA Issued 1974 2703-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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