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ANALYTICAL METHODOLOGY <br /> Metal Anlaysis by ICRP Scan: Method 3050/6010 <br /> Digestion Proceedure: <br /> 2 grams of a homogeneous soil sample are weighed into a clean acid rinsed <br /> 250 m.1 teflon beaker. 5 mls of nitric acid (HNO3) and 5 mls 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 HNO3 are added, and the sample is heated 30 additional <br /> minutes. The sample is again cooled, 3 mls 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 100 ml with D.I. <br /> Analysis: <br /> Metal digestate analysis uses a sequential multi-element determination of <br /> elements in solution. The basis of the method is the measurement of the <br /> atomic emission by an optical spectroscopic technique. Samples are <br /> nebulized and introduced to the plasma torch. Characteristic atomic line <br /> emission spectra are produced by a radio-frequency inductively coupled <br /> plasma (ICP). The intensities of the emissions are related to the <br /> concentrations of trace elements present in the sample. These <br /> concentrations are then determined by comparison with standard curves of <br /> known amounts. Method blanks, method blank spikes, duplicates, and <br /> 1 sample spike quality controls are run along with the samples to assure <br /> accuracy. <br /> CHEMWEST ANALYTICAL LABORATORIES,INC, <br />