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L1 <br />A S C I <br />~~'IV.'c ^~ :.R3I4'A10Y~16' <br />' Sample 4: Collection Pond <br />' - total cyanide - 126 mg/L <br />WAD cyanide - 1 12 mg/L <br />- free cyanide - (WAD cyanide -minimum WAD metallo-cyanide <br />' complexes =maximum theoretical value for free <br />cyanide) <br />' 1 12 - 80 = 32 mo/L <br />In practice, the above method gives the maximum potential free cyanide levels in <br />' samples. Amore realistic maximum estimate of the free cyanide levels can be made <br />by considering all the metal data and by choosing the most probable metallo-cyanide <br />complex and not the minimum metal oxidation state. The latter will mean more <br />' cyanide is needed to account for the metallo-cyanide complexes, reducing the free <br />cyanide residual value. "Realistic" maximum free cyanide levels would be: <br />' Sample lt1: 184 mg/L <br />• Sample #2: No estimate <br />` Sample 1J3: 22 mg/L <br />• Sample Jt4: 15 mg/L <br />' These free cyanide values have been calculated using the mean metal analyses and <br />taking 10°~ of the copper cyanide as being as Cu(CN) g , with 90°h of the copper <br />cyanide being Cu(CN) 2. If any Cu(CNIq were to be present or the mass of Cu(CN~ <br />' increased, the residual free cyanide value would decrease commensurately. <br /> <br /> <br /> <br /> <br />1 <br /> <br />9 <br />t <br />