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1,5-二(2-羟基-5-磺基苯基)-3-氰基甲(月朁)(HSPCF)已用于钒的分光光度测定。实验比较了不同氰基甲(月朁)衍生物的分析性能并发现,新合成的1,5-二(2-羟基-5-氯苯基)-3-氰基甲(月朁)(HCPCF)借表面活性剂的增溶效应溶于弱酸性水溶液后,用于钒的测定优于HSPCF。与HSPCF相比,用HCPCF-吐温-80作试剂的反应,其对比度△λ由110nm增至160nm,摩尔吸光系数由2.45×10~4增至3.0×10~4。本报告提出了用HCPCF-吐温-80作试剂分光光度测定微量钒的方法。实验部分一、试剂和仪器 1.HCPCF溶液:1.0×10~(-3)M,用本实验室合成的HCPCF以75%乙醇配制而成,其余的浓度均由此溶液用75％乙醇稀释。
1,5-Bis (2-hydroxy-5-sulfophenyl) -3-cyanomethanone (HSPCF) has been used for the spectrophotometric determination of vanadium. The analytical performance of different cyanometalate derivatives was compared experimentally and it was found that the newly synthesized 1,5-bis (2-hydroxy-5-chlorophenyl) -3-cyanomethanone ) By the solubilizing effect of surfactants dissolved in weak acidic aqueous solution, the determination of vanadium better than HSPCF. Compared with HSPCF, with the reaction of HCPCF-Tween-80 as reagent, the contrast △ λ increased from 110nm to 160nm, and the molar absorptivity increased from 2.45 × 10-4 to 3.0 × 10-4. This report presents a method for the spectrophotometric determination of trace vanadium using HCPCF-Tween-80 as a reagent. Experimental Part I. Reagents and Instruments 1.HCPCF solution: 1.0 × 10 -3 M, prepared with HCPCF from our lab in 75% ethanol. The remaining concentration was diluted with 75% ethanol.