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在 4.5×10~(-2)mol/l NH_4Cl-5.4×10~(-2)mol/l NH_3-2×10~(-3)mol/l 铜铁试剂溶液(pH～9.5)中,用示差脉冲吸附伏安法测定海水中痕量 Cr(VI)。导数峰电位为-1.40 V(VS.Ag/AgCl)、峰电流与 Cr(VI)浓度在 0.05～1.2 ng/ml 范围内呈线性关系。检出限为 0.04 ng/ml。对 Cr(VI)含量为 0.35 ng/ml的海水样品,变异系数为 7.6％,平均回收率为92％。本法已应用于厦门近岸海水中 Cr(VI)的测定。
In 4.5 × 10 -2 mol / L NH 4 Cl-5.4 × 10 -2 mol / L NH 3 -2 × 10 -3 mol / l copper-iron reagent solution (pH 9.5) Determination of trace Cr (VI) in seawater by differential pulse voltammetry. The derivative peak potential was -1.40 V (VS.Ag/AgCl). The peak current was linear with the concentration of Cr (VI) in the range of 0.05-1.2 ng / ml. The limit of detection was 0.04 ng / ml. The sea water samples with a Cr (VI) content of 0.35 ng / ml had a coefficient of variation of 7.6% and an average recovery of 92%. This Law has been applied to the determination of Cr (VI) in coastal waters of Xiamen.