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-10- <br /> 2 . 1 .7 Field Log. <br /> 2 . 2 REAGENTS USED AS PRESERVATIVES <br /> Different parameters and groups of parameters require dif- <br /> ferent means of preservation. ( See Table 2 to select the <br /> appropriate preservative. ) <br /> 2 . 2 . 1 Concentrated nitric acid, Baker Instra-Analyzed. <br /> 2 . 2 . 2 Water; High Performance Liquid Chromatography (HPLC) <br /> grade from J. T. Baker , reserved lots . <br /> 2 . 2 . 3 pH buffers with pH' s of 10 . 0, 7 . 0 and 4 . 0 . <br /> 2 . 2 . 4 Concentrated hydrochloric acid, Baker Instra- <br /> Analyzed. <br /> 2 . 2 . 5 Concentrated sulfuric acid, Baker Instra-Analyzed. <br /> 2 . 2 . 6 Concentrated phosphoric acid, Baker Instra-Analyzed. <br /> 2 . 2 .7 Copper sulfate crystals, Baker Analyzed Reagent . <br /> 2 . 2 . 8 Sodium chloride, Mallinckrodt Analytical Reagent . <br /> 2 . 3 PROCEDURES TO PREPARE BOTTLES <br /> 2 . 3 . 1 Use commercially cleaned bottles for all sampling. <br /> Commercially cleaned bottles are currently obtained <br /> from I-Chem Research, 23787-F Eichler Street , <br /> Hayward, CA 94545 ( I-Chem) and from California <br /> Analytical Laboratories, 2544 Industrial Boulevard, <br /> West Sacramento, CA 95691 (Cal Labs) . <br /> [Cal Labs maintains an inventory of several sizes for <br /> their customers. Preservatives are added and bottles <br /> are prelabeled for appropriate analytes. Cal Labs <br /> runs quality control inspections on their prepared <br /> bottles. ] <br /> 2 . 3 . 2 Should containers not be available from the vendors <br /> above (Section 2 . 3 .1) then prepare sample containers <br /> with seals and glassware according to the following <br /> steps : <br />