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已发展了一种高灵敏的微分脉冲极谱法,以便用低PH的磺胺酸以及N—(1—萘基)乙撑二胺二氢氯化物,在重氮化后,测定亚微摩尔浓度的亚硝酸根离子。在PH2.0时,用0.01M磷酸二氢钾作基底电解质,在简单水溶液中,浓度范围为5×10~(-?)—2.12×10~(-6)M,在+0.020V(相对于饱和甘汞电极)时,峰电流线性升高.测定1×10~(-7)M亚硝酸根的相对标准偏差为3.3％。
A highly sensitive differential pulse polarography has been developed to measure sub-micromolar concentrations after diazotization with low pH sulfanilic acid and N- (1-naphthyl) ethylenediamine dihydrochloride Of nitrite ions. At pH 2.0, 0.01 M potassium dihydrogen phosphate was used as the substrate electrolyte in a simple aqueous solution at concentrations ranging from 5 × 10 ~ (-2) × 2.12 × 10 ~ (-6) M at + 0.020V At saturated calomel electrode, the peak current increased linearly, and the relative standard deviation of 1 × 10 ~ (-7) M nitrite was 3.3%.