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<br />5.0 REAGENTS <br />5.1 See Section 5.0 of Method 7000. <br />5.2 Preparation of standards: <br /> <br />5.2.1 Stock solution: Dissolve 1.303 g thallium nitrate, T1N03 <br />(analytical reagent grade), in Type II water, acidify with 10 mL <br />concentrated HNO~, and dilute to 1 liter with Type I[ water. Alterna- <br />tively, procure a certified standard from a supplier and verify by <br />comparison with a second standard. <br />5.2.2 Prepare dilutions of the stock solution to be used as <br />calibration standards at the time of analysis. The calibration standards <br />should be prepared using the same type of acid and at the same <br />concentrations as in the sample after processing (0.5% v/v HNO,). <br />5.3 Palladium chloride: Weigh 0.25 g of PdClz to the nearest 0.0001 g. <br />Dissolve in 10 mL of 1:1 HNO, and dilute to 1 liter with Type II water. Use <br />equal volumes of sample and palladium solution. <br />6.0 SAMPLE COLLECTION. PRESERVATION. AND HANDLING <br />6.1 See Chapter Three, Section 3.1.3, Sample Handling and Preservation. <br />7.0 PROCEDURE <br />7.1 Sample preparation: The procedures for preparation of the sample are <br />given in Chapter Three, Section 3.2. <br />7.2 See Method 7000, Paragraph 7.3, Furnace Procedure. The calculation <br />is given in Method 7000. Paragraph 7.4. <br />8.0 QUALITY CONTROL <br />8.1 See Section 8.0 of Method 7000. <br />9.0 METHOD PERFORMANCE <br />9.1 Precision and accuracy data are not available at this time. <br />9.2 The performance characteristics for an aqueous sample free of <br />interferences are: <br />Optimum concentration range: 5-100 ug/L. <br />Detection limit: 1 ug/L. <br />7841 - 2 <br />CO-ROM Revision 0 <br />Date September 1986 <br />