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ANALYTICAL METHODOLOGY <br /> Digestion Proceedute for Metals Analysis: <br /> 2 grams of a homogeneous soil sample are weighed into a clean acid rinsed <br /> 250 ml teflon beaker. 5 mls of nitric -acid (HNO3) and 5 m1s of deionized <br /> water (D.I.) are added to the sample and the mixed slurry is heated in a <br /> glass bead bath for 10 minutes. The sample is cooled; 5 mls of <br /> concentrated HN0.8 are added, and the sample is heated 30 additional <br /> minutes. The: sample is again tooled, 3 mis of 30% Hydrogen Peroxide and <br /> 2 mls D.I. are added and the slurry is heated for. 15 to 20 minutes. 5 mls <br /> of 1:1 hydrochloric acid and 10 mls D.I. are then added. to the :sample which <br /> is heated a final 10 minutes. After cooling, the sample digestate is filtered <br /> through filter paper and the final volume is adjusted to IGO ml with D.I. <br /> CHEWASTANALY11CAL LABC-PATORIES.INC. <br />