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9 1 2 For samples contaInIng particulates mg/l metal In sample = A ( ~) where A= mg/l ofmetal In processed sample from cahbratIOn curve V= final volume ofthe processed sample In m1 C= ml ofsample ahquot processed 9 1 3 For sohd samples report all concentratIOns as mglkg dry weight 9 1 3 1 Dry sample: AxV mg metal/kg sample = D where A= mg/l ofmetal In processed sample from cahbratIOn curve V= final volume ofthe processed sample In ml D= weight ofdry sample In grams 9 132 Wetsample AxV mg metal/kg sample = W x P where A = V = W = P = mg/l ofmetal In processed sample from cahbratIOn curve final volume of the processed sample In ml weight of wet sample In grams %sohds 92 Special ExtractIOn Procedure When the concentratIOn of the metal IS not sufficiently high to determIne directly, or when conSiderable dissolved sohds are present In the sample, certaIn metals may be chelated and extracted with orgamc solvents Ammomum pyrrohdIne dlthlocarbamate (APDC) (see footnote) In methyl Isobutyl ketone (MIBK) IS widely used for thiS purpose and IS particularly useful for ZInC, cadmIUm, Iron, 6 manganese, copper, sliver, lead and chromlUm+ with APDC unless It has first been converted to the hexavalent form [AtomiC Absorption Newsletter 6, p 128 (1967)] ThiS procedure IS descnbed under method 218 3 The name ammOnIum pyrrohdme dlthlOcarbamate (APDC) IS somewhat ambiguous and should more properly becalledammomum, I-pyrrohdme carbodlthlOate (APCD), CAS RegIstry No 5108-96-3 MET ALS-14 Tn-valent chromIUm does not reactPDF Image | Methods for Chemical Analysis of Water and Wastes
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