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<br />t • ~ ~ ~uA~.as n1 C~zlnirlec <br />positive I he noted that the free cyanide analysis is often too high. due to inierfcranccs <br />ery low associated with the titration method in mining solutions. In some cases. the free <br />cyanide level is hi~~h~r than the wad cyanide level which is not possible. <br />method. The difference between the total and wad cyanide values is 25 mg/I. The only metal <br />n is not cyanide complex of the three mentioned that does not report in the wad procedure <br />is th:u of iron, which only reports in the total cyanide analysis. Therefore, the <br />corresponding iron concentrmion present in the solution should be at above 9.0 mg/I <br />potential (i.e. 0.36 x 25 mg/I ). <br />e is an <br />Assuming the free analysis is correct, about 50 mg/I of the wad cyanide is <br />complexed (i.e. 175 m~Jl - 125 mg/I = 50 mg/I). The corresponding copper and <br />atmems: nickel concentrations should be 34.0 mg/I and 5.0 mg/I, respectively. These two <br />metals' concentration correlate to a calculated wad cyanide level of 50 mg/I. As a <br />result, it appears the metals and cyanide values are self consistent. and the anah-scs <br />are reliable. Differences in the calculated and actual cyanide levels of I(1-20 perrent <br />are common with nteutllurgical solutions. <br />ure <br />I 2.6 REFERENCES <br />ASCI/SRK, "An Evaluation of the Effectiveness of Rinsing Procedures on Cyanide <br />pleting a Removal from Spent Heap Leach Ore; Brohm Mining Corporation. Lead. South <br />from the Dakota, USA", for Suue of South Dakota, September 1990. <br />ASTM, Section 11, Water and Environmental Technology. Volume 11.02. 1985. <br />cyanide <br />u(CN),), Barron, P., Hamner, C.A., and Kennedy. D.C., "Analysis of Cyanides in Coke Plant <br />anide is Wastewater Effluents". Journal Water Pollution Control Federation. pp. 234-~39. <br />mr main 1978. <br />i to the <br />+. Based Brickell, R.H.. "Chemistry of Cyanide Solutions". Presented at Cyanide and the Oold <br />~ of each Mining Industry: A Technical Seminar, sponsored by Environment Canada and <br />Canadian Mineral Proces.cots. 1981. <br />Conn. K., "Cyanide Analysis in Mine EfFluents", Cyanide and the Gold Mining <br />Industry: A Technical Seminar, Ottawa, Ontario, 1981. <br />Csikai, NJ. and Barnard, A.A..Jr.. "Determination of Total C_ynnide in <br />solution Thiocyanate-Containing Wastewaters".Analytical Chemistry. Vol. 5S. p. 1677, 1983. <br />t should <br />43 Cl+~yner rrrn <br />