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本文合成了新显色剂2-[2-(苯并噻唑)-偶氮]-4-甲基-5-二羧甲氨基苯甲酸(BTACT),研究了在十二烷基硫酸钠(NaLS)存在下它与镍的显色反应。研究结果表明,在微酸性介质中能形成稳定的蓝紫色配合物,其组成为Ni(Ⅱ):BTACT=1:2,最大吸收波长为605nm,表现(?)尔吸光系数为8.07×10~(?)L·mol~(-1)·cm~(-1),镍的浓度在0～10μg/25ml范围内服从比耳定律。反应具有较高的灵敏度,选择性好,Fe(Ⅲ)的允许量较大.只有Co(Ⅲ)、Cu(Ⅱ)、Pd(Ⅱ)、Fe(Ⅱ)有干扰,其中铜、钯的干扰可用硫脲掩蔽。用于纯镁、纯铜、铝合金、钢铁试样中微量镍的测定,结果满意。
In this paper, a new color reagent 2- [2- (benzothiazole) -azo] -4-methyl-5-dicarboxymethylaminobenzoic acid (BTACT) was synthesized and studied in sodium lauryl sulfate ) In the presence of its color reaction with nickel. The results show that the formation of a stable blue-purple complex in a slightly acidic medium has a composition of Ni (Ⅱ): BTACT = 1: 2 and a maximum absorption wavelength of 605 nm. The absorption coefficient of the reaction is 8.07 × 10 ~ (?) L · mol ~ (-1) · cm ~ (-1), and the nickel concentration obeys Beer’s law in the range of 0 ~ 10μg / 25ml. The reaction has high sensitivity and good selectivity, and the allowable amount of Fe (Ⅲ) is relatively large. Only Co (Ⅲ), Cu (Ⅱ), Pd (Ⅱ) and Fe (Ⅱ) Available thiourea masking. For pure magnesium, pure copper, aluminum, steel samples in the determination of trace nickel, with satisfactory results.