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• characteristics determined is the field. <br />The "DPTA (diethylenetriaminepentaacetic acid) Bztractable" <br />method was used for analyzing samples for Zinc, Iron, Copper, <br />Manganese, Cadmiimm, Lead and Nickel, For Selenium, Arsenic and <br />Boron, the "hot water eztract" method was used. Potassium and <br />Phosphorus were analyzed in the "available" form. <br />The laboratory method for determining acid-base potential is as <br />follows: The acid-base potential was determined from values for <br />total sulfur, sulfate, and neutralizing bases present in the sample. <br />Total sulfur was determined by the Leco Furnace Method. Sulfate vas <br />determined by turbidimetry on a CaH4 (P04)Z eztract of the sample. <br />• Total sulfur minus sulfate gives the amount of acid-producing sulfur <br />in the saple, To determine the neutralizing bases present, the <br />samples were treated with an excess of standard HC1 and boiled to <br />expel all COZ produced. The resulting solutions were then titrated <br />with standard base to pH 7 and the neutralization potential vas <br />calculated. The values for acid-producing sulfur and neutralizing <br />bases were then compared to establish the capability of the sample <br />to neutralize any acid produced. Acid-base potential is reported in <br />tone of CaC03 equivalent per thousand tons of material. This method <br />is the one used to calculate acid-base potential such as that <br />required by the Wyoming DEQ Guidelines for overburden. The <br />difference between total sulfur and sulfate sulfur gives all reduced <br />• forma of sulfur remaining in the material. For many areas in the <br />Onited States it has been shown that the vast majority of these <br />2.04-34 <br />