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ARSENIC Method 206.3 (Atomic Absorption-gaseous hydride) STORET NO. Total 01002 Dissolved 01000 Suspended 01001 1 Scope and ApphcatIOn l I T h e gaseous hydnde method determmes morgamc arsemc when present m concentrationsatorabove2ug/l ThemethodISapphcabletodnnkmgwaterandmost fresh and sahne waters m the absence of high concentratIOns of chromIUm, cobalt, copper, mercury, molybdenum, mckel and stIver 2 Summary ofMethod 21 Arsemc m the sample IS first reduced to the tnvalent form usmg SnCl2 and converted to arsme, AsH3, usmg zmc metal The gaseous hydnde IS swept mto an argon-hydrogen flameofanatomICabsorptlonspectrophotometer TheworkmgrangeofthemethodIS 2-20ug/l The1937nmwavelengthlmeISused 3 Comments 3 1 32 33 34 35 In analyzmg dnnkmg water and most surface and ground waters, mterferences are rarely encountered IndustnalwastesamplesshouldbespIkedwithaknownamountofarsemc to estabhsh adequate recovery Orgamc forms of arsemc must be converted to morgamc compounds and orgamc matter must be oXidized before begmmng the analysIs The OXidatIOn procedure given m Method 206 5 (Standard Methods, 14th Edition, Method 404B, p 285, Procedure 4 a) has been found sUItable For sample handhng and preservation, see part 4 1 of the AtomiC Absorption Methods section ofthis manual For quahty control reqUIrements and optional recommendations for use m dnnkmg water analyses, see part 10 ofthe AtomiC AbsorptIOn Methods section ofthts manual Data to be entered mto STORET must be reported as ug/l 4 PrecIsion and Accuracy 4 1 Ten rephcate solutions of o-arsemhc aCid at the 5, 10 and 20 ug/llevel were analyzed by asmglelaboratory StandarddeViationswere ±O3, ±O9and ±11withrecovenesof94, 93 and 85%, respectIvely (Caldwell, J S , Lishka, R J , and McFarren, E F , "EvaluatIOn ofa Low Cost Arsemc and Selemum Determmatlon at Microgram per Liter Levels", JA.WW A, vol 65, P 731, Nov, 1973 ) Approved for NPDES and SDWA Issued 1974 206 3-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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