Abstract
AbstractA new method for the in direct determination of thiocyanate with ammonium sulfate and isopropyl alcohol by extraction‐flotation of cop per in the presence of ascorbic acid is described. A small amount of Cu(II) is reduced to Cu(I) by ascorbic acid, then Cu(I) is precipitated with SCN−. In the course of phase separation of isopropyl alcohol from water, the precipitated CuSCN stays in the interface of isopropyl alcohol and water. A good linear relationship is observed between the flotation yield of Cu(II) and the amount of SCN−. The detection limit for thiocyanate is 1.0 × 10−5 M, and the linear range is 1.0 × 10−5 ∼ 7.8 × 10−5M. Every parameter was optimized and the reaction mechanism was studied. The method is simple and rapid and it was successfully applied to the determination of thiocyanate in urine and saliva of smokers and non‐smokers and in venous blood of patients in fused with sodium nitroprusside.
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