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. • • <br />I <br />_, _.. I <br />_ .. TABLE 1 <br />RELATIVE STABILITY OF METAL CYANIDE COMPOUNDS AND COMPLEXES IN HATER <br />(LISTED IN APPROXIMATE ORDER OF INCREASING STABILITM) <br />CYANIDE SPECIES. EXAMPLES PRESENT IN THE HEAPiENVIRONMENT <br />1. Free Cyanide CN-, NCN <br />2. 5lmple Cyanide Compounds <br />e) Readily soluble NaCN.t(JCN, Ca(CN)Z, Hg(CN)p ~ ~ . <br />b) Relatively insoluble Zn(CN)2, CuCN, Mi(CN)y. AgCN <br />3. ifeak Hetal-Cyanide Zn(CN)gZ-.. Gd(CN)3-, Cd(CN}q~- <br />Complexes ~ •' <br />`q. Moderately Stron Metal- Cu(CN)-p, Cu(CN)g2-, N1(CN)gZ-, Agl(CN)-y <br />Cyanide Complexe~ <br />5. Strong Metel-Cyanide Fe(CN)63-; Fe(CN)64','Co(CN)6¢-, pu(CN)-Z, Ng(CN)gZ' <br />Complexes . <br />