1-(2-羟基-3,5-二硝基苯)-3-(4-苯基-2-噻唑)-三氮烯的合成及其与镍的显色反应

Synthesis of a Reagent 1-(2-Hydroxy 3,5-dinitro-phenyl)-3-(4-phenyl-2-thiazole) Triazene and Its Colour Reaction with Nickel

合成了新试剂 1 - (2 -羟基 - 3,5-二硝基苯 ) - 3- (4-苯基 - 2 -噻唑 ) -三氮烯 ,研究了在表面活性剂TritonX - 1 0 0存在下 ,它与Ni2 +的显色反应。结果表明 ,在 pH 6.0～ 7.5时 ,Ni2 +与该试剂形成配合物 ,其最大吸收峰位于 51 5nm处 ,摩尔吸光系数为 1 .0 8× 1 0 5 L·mol- 1 ·cm- 1 。Ni2 +在 0～ 0 .4mg/L内符合比尔定律。方法已用于矿物、合金、钢样中微量镍的测定 ,结果与原子吸收法相符 ,相对标准偏差RSD <5% (n =6)

A new reagent 1 (2 hydroxy 3,5 dinitrophenyl) 3 (4 phenyl 2 thiazole) triazene (HDNPTT) was synthesized and its colour reaction with nickel was studied. The results show that in the presence of Triton X 100 , nickel(Ⅱ) reacts with HDNPTT at pH 6.0～7.5 to form a complex. The complex exhibits maximum absorption at 515 nm with a molar absorptivity of 1.08×10 5 L·mol -1 ·cm -1 . Beer's law is obeyed in the range of 0～0.4 mg/L for Ni(Ⅱ). The reaction has been applied to the determination of trace nickel (Ⅱ) in mineral, alloy and steel samples. The results are in agreement with those provided by AAS with precision of <5% RSD ( n =6).