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<br />ANALYTICAL -GENERAL <br />As the concentrations of CNP or CNw„A and Fe approach zero, the fornlula <br />becomes less exacting since a ligand other than cyanide might be present to keep the iron <br />(Fe) in solution. <br />105 <br />104 <br />~ 103 <br />n <br />a <br />`/ 100 <br />f- <br />v 10 <br />1 <br />0.1 <br />0.1 <br />Assay Comparison of <br />CNwad + 2.795+Fe .vs. CNT <br />CNp + 2.795~Fe .vs. CNT <br />1 10 100 103 104 105 <br />CNwad + 2.795^Fe <ppm> <br />The direct colorimetric method allows for the accurate measurement of 8 - IEA µg <br />CN~ in a sample aliquot of up to 10 mL. For samples containing greater than 800 ppm <br />CNp, dilute with disdllcd water. The table below should be used as a guide to determine <br />the sample aliquot to be used for preparing the 40 ml mixture of the unknown. <br /> <br />K.~wusnc.m 6 <br />