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rE <br /> S.i Sludgaz, sediments, and soils: weigh out to the nearest O.l g <br /> about 5o g of hemoganizad sampie into an stoppetad CYIeameya_ flask. <br /> Add l00 -.IL xylene. Stopper tha flask and shake half an hour on a <br /> Filter the extract through filter paper containing <br /> mechanics'- shaker. <br /> anhydrous <br /> approximately 5.09ms o€ anyp le sodium sulfate' <br /> s <br /> amethyl <br /> samp lead. The <br /> ex_racts 85-353 of spiked soil <br /> efficiency of extraction depend on the rroistura content of the sample. <br /> e of rco:e than hal° an hour results in loss of <br /> Also, extraction tim <br /> organoload due to oxidation by air (02) - <br /> 5.2 pipes 20 ml of MIaX into a So r+l volumetric flask. <br /> 5.3 Pipet 20.0 ml of the xylene extract (Step 5.1) into the flask and . <br /> mix. <br /> 5.4 Pipet 0.1 ml of 12 solution into the flask and mix for about one ;Binute. <br /> 5.5 Pipet 5,ml of 10 iquo 336 in MI3K and mix. <br /> 5.6 Diiuta o volume with M K and mix. <br /> (6) Standard and blank pr�scation: <br /> • . <br /> eq appropriate working standards from <br /> Prepare a blank and a minimum of thr <br /> 100 ug/m1 Bb standard. <br /> 6.1 Add approximately 20 ml of xylene to 5o mi volumetric flask. Pipet <br /> thQ correct amount of the 106 ug/ml Pb standard into tho flask to i <br /> prepare the desired standard concentration. f,.. <br /> 6.2 Add immediately 0.1 ml <br /> of IZ solution and:'raix Well. " - <br /> r <br /> 6.3 Add 5 ml of 1� Aliquot 336/MIBX and mix well. (4 <br /> -_ 5.4 Dilute to volume with MIBX and mix well. " <br /> 6.5 Blank xylene/MISK (400 xylene) should be treated as the working <br /> Standard solutions. <br /> (7) Analysis: <br /> , <br /> 7.1 Set-up the AA according to manufacture <br /> actuse broad bandabsoratco <br /> oninterfeeence. <br /> background correction to <br /> e acetylene :low to 8.5 1/min <br /> 7.2 Aspirate H20 into the flame and adjust th <br /> and the aif flow to 25 1/rain. <br /> - f <br /> - 73--_Aspirsta-Mraic containing -400_xylene in <br /> the flare. <br /> ,3_ <br />