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<br /> <br />ANALYTICAL -GENERAL <br />J <br />Assay Comparison of <br />CNwad .vs. CNp <br />n 250 <br />E <br />n 200 <br />v <br />300 <br />0 150 <br />3 <br />Z <br />U 100 <br />50 <br />0~ <br />0 <br />50 100 150 200 250 300 350 <br />CNp <ppm> <br />The ieducdon of picric acid is effected by free cyanide only. Cyanide tied up in <br />copper, nickel, riot or cadmium complexes is liberated by metathesis with: <br />• diethylenetriaminepentaacedc acid (DTPA) or <br />• ethylenediaminetetraacetic acid (EDTA). <br />Iron-cyanide complexes, cobalt-cyanide complexes, gold-cyanide complexes, and <br />silver-cyanide complexes do not react leaving their portion of cyanide undetermined <br />Usually only iron cyanide is present in any significant concentration so ape can calculate <br />total cyanide (CNr) with one of the two formulae <br />CNr = CNP + 2.795 x Fe <br />CNr = CNw„a + 2.795 x Fe <br />C~ <br />350 <br />K~.~..,K,~, <br />5 <br />