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3.2.6.1 Principle— <br /> In doubtful cases, as stated in 3.2.4.1, this method should be used to rule <br /> out HCl-extractable and non-extractable forms of sulfur which are not <br /> considered to be acid foragers. The HNO3-extractable sulfur is determined <br /> by calculations. This form of sulfur will react with oxygen to produce acid. <br /> 3.2.6.2 Comments-- <br /> It is necessary to remove chlorides and nitrates by water leachings after <br /> the hydrochloric and nitric acid (res ective <br /> total sulfur. P ly) extractions before manning <br /> Care should be taken that no sample is lost by run over, splashing or <br /> breaking through the filter paper during a.0 leachings. <br /> 3.2.6.3 Chemicals-- <br /> 1. Hydrochloric acid (HCl), 2 parts acid to 3 parts water: Mix 400ml of <br /> concentrated HC1 with 600 ml of distilled water. <br /> 2. Nitric acid (HNO3), 1 part acid to 7 parts water; Mix 125 ml of <br /> concentrated HNO3 with 875 ml of distilled water. <br /> 3. Silver Nitrate (AgNO3), 10%; Dissolve 10.0 g of AgNO3 in 90 ml of <br /> distilled water. Store in amber bottle away from light. <br /> 4. Nessler's Solution (Fisher Scientific Co. No. So-N-24 or equivalent). <br /> 3.2.6.4 Materials-- <br /> 1. Leco Induction Furnace and Automatic Sulfur Titrator as in 3.2.4.4. <br /> 2. Funnels, 28 mm I.D. polyethylene. <br /> 3. Filter paper, 5.5 cm glass fiber. <br /> 4• Flasks, Erlenmeyer, 250 ml. <br /> 6o <br />