Fe（Ⅲ）－TEA－5－Br－PADAP－H_2O_2体系中催化波的研究及其应

Study and Application of the PolarographicCatalytic Wave of Fe(Ⅲ)-TEA-5-Br-PADAP-H_2O_2

在０．２ｍｏｌ·Ｌ￣（－１）ＮＨ＿４Ｃｌ－ＮＨ＿３·Ｈ＿２Ｏ底液中，（ｐＨ为９．２６），得到一个极为灵敏的Ｆｅ（Ⅲ）－ＴＥＡ－５－Ｂｒ－ＰＡＤＡＰ－Ｈ＿２Ｏ＿２配合吸附催化波，其峰电位为－０．７１Ｖ（ｖｓ．ＳＣＥ）。铁浓度在１．８×１０￣（－１０）～５．４×１０￣（－６）ｍｏｌ·Ｌ￣（－１）范围内与二阶导数波高呈线性关系。对该极谱波的性质进行了研究，证明是一种配合吸附催化波，并成功地应用于各类水样，钒催化剂中微量或痕量铁的测定。

In a supporting electrolyte containing 0.2 mol/LNH_4Cl-NH_3·H_2O at pH9. 26,a sensitive complex waveof Fe(Ⅲ)-TEA-5-Br-PADAP-H_2O_2 can be obtained by single-sweep polarography. The peak potential ofthe derivative wave is -0.71V( vs. SCE ).A linearrelationship between peak currents and concentrationsof Fe(Ⅲ) holds in the range of 1.8×10￣(-10)～5. 4×10￣(-6) mol/L of Fe(Ⅲ).In this paper the behavior ofthe polarographic complex wave was presented. It wasshown that this is a kind of catalytic wave. Themethod has been applied to determine trace or microFe in water and V-catalyst with satisfactory results.