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sarnples were left in a natural condition and the remaining two were acidified <br />• individually with sulfuric acid and nitric acid. The samples were refrigerated and <br />transported to the laboratory. Upon receiving The samples, the laboratory filtered <br />one natural sample acidified the sample and analyzed it for dissolved metals. This <br />procedure was changed in September, 1980, and henceforth the sample To be used for <br />dissolved iron and orthophosphate determinations was filtered before transport to the <br />lab. The methodology involved in the analysis of the samples is shown below. All <br />Standard Methods references refer to "Standard Methods for The Examination of <br />Water and Wastewater." 14th edition, American Public Health Association, 1975. <br />Tofal Dissolved Solids -Determined by a gravimetric method by <br />evaporation of the filtrate from the suspended solids deterrnination (see below). An <br />aliquot of filtrate is evaporated and dried at 103° - 105° C in a preweighed dish. <br />Dissolved solids are reported in mg/I. Reference: Standard Methods, page 93. <br />Total Suspended Solids -Determined by a gravimetric method using <br />a standard glass fiber filter disk to collect the solids, followed by drying to constant <br />weight at 1030 - 1050 C. Suspended solids are reported in mg/I. Reference: <br />Standard Methods, page 94. <br />pH -Determined by direct measurement using a digital pH meter and <br />• cornbinaTion electrode. <br />Total Alkalinity - An aliquot of sample is Titrated with standard H3504 <br />to a pH of 4.4. Alkalinity is reported as mg/I CaC03. <br />Sodiurn Absorption Ratio -SAR is calculated from concentrations obtained <br />for Ca, Mg and Na according to the equation <br />SAR Na <br />CCa + M11 /2 <br />z J <br />where the concentrations are expressed in milli-equivalents per liter. <br />Ammonia Nitrogen -The sampled is buffered at pH 9.5 with o borate <br />buffer and distilled into a solution of boric acid. The boric acid is then neutralized and <br />the solution is treated with Nessler reagent. Ammonia concentration is then determined <br />calorimetrically. Arnmonia is reported in mg/I-N. Reference: Standard Methods, page <br />412. <br /> <br />Revised 7-81 2.5-I 10 <br />