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Table 3.1. Instrumentation utilized for water chemistry <br />analyses by Bureau of Reclamation water quality <br />laboratory. <br />Water quality component Instrumentation <br />Major cations <br />Na, K, Ca, Mg <br />Major anions <br />Cl, S04 <br />Alkalinity <br />Nutrients <br />SRPa, NH4, N03-NO2, Silica <br />N03 <br />Total phosphatesb <br />Atomic absorption <br />Ion chromatograph <br />Potentiometric titration <br />Flow injection analysis <br />Ion chromatograph <br />Persulfate oxidation <br />Ammonium molybdata/ <br />ascorbic acid <br />Narrow-band spectrophometer <br />a Soluble reactive phosphate <br />b 2 ml of HC1 were added as preservative to.all nutrient <br />samples. This addition of strong acid undoubtedly <br />solubilized some phosphate, thus increasing the SRP <br />component. <br />-19-