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3 <br />procedures were performed on samples from the site, and both total and dissolved samples <br />were collected and analyzed from the process points to determine whether the "greenish <br />precipitate" caused analytical interferences. <br />The only determinations performed on the samples collected for this trip were total cyanide, <br />WAD cyanide, nitrate+nitrite, calcium, copper, iron, sodium and zinc. The five metals were <br />selected because they can form complexes of varying stability with cyanide, and <br />nitrate+nitrite determinations were performed because of potential interferences with <br />cyanide determinations. <br />2.1 FIELD MEASUREMENTS <br />The dissolved oxygen and pH/conductivityltemperature meterswere calibrated~each morning <br />using pH 7 and 10 buffers, 1433 µS/cm conductivity standard and an air calibration for the <br />dissolved oxygen meter. <br />2.2 FIELD QUALI'T'Y CONTROL SAMPLES <br />The rinse blank (taken after the collection pond sample) was prepared by wastring the barrel <br />filter with soapy water, rinsing with tap water, rinsing with DI water, placing a filter in the <br />barrel filter, filling the barrel filter with DI water and pulling the DI water through the filter <br />using a hand pump. <br />As stated above, the DI water used for rinsing and field/rinse blanks was second-stage DI <br />water (which was finished through the 5na1 three columns of the ion-exchange system). <br />23 SAMPLE PRESERVATION <br />The process point samples were 5ltered using the barrel filter and disposable 0.45µm pore- <br />size filter membranes. As listed above, the samples were checked after collection to ensure <br />that they were preserved to the proper pH, and nitrate+nitrite samples were preserved with <br />sulfuric acid to pH<2. <br />RCG/Hagler, Bailty, Ine <br />