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本文献研究了硝基磺酚C与钒显色的各种条件,试验表明,硝基磺酚C与钒显色的最佳酸度为pH1.5～3.0,在羟胺存在下,生成稳定的三元络合物。络合物最大吸收波长在640nm处,摩尔吸光系数为2.8×10~4,络合物组成为钒:硝基磺酚C:羟胺=1:1:1。钒浓度在0～60水gV_2O_5/25ml范围内服从比尔定律。方法借助于氟化钠和酒石酸作掩蔽剂具有较高的选择性,可不经分离而直接进行测定,尤其适合含铀、钼高的样品中微量钒的测定。 一、主要试剂和仪器 盐酸—氯化钾缓冲溶液:用0.2N盐酸溶液和0.2N氯化钾溶液混合制成pH1.8的缓冲溶液;
In this paper, various conditions for the color development of nitrosulphol C and vanadium have been studied. The results show that the optimal acidity of nitrochlorobenzene C and vanadium is pH 1.5 ~ 3.0. Under the presence of hydroxylamine, the stable tris Element complex. The maximum absorption wavelength of the complex at 640nm, the molar absorption coefficient of 2.8 × 10 ~ 4, the complex composition of vanadium: nitrosulphol C: hydroxylamine = 1: 1: 1. The vanadium concentration obeys Beer’s law in the range of 0 ~ 60 gV_2O_5 / 25ml. The method has high selectivity by using sodium fluoride and tartaric acid as masking agent, and can be directly measured without isolation, and is particularly suitable for the determination of trace vanadium in samples containing uranium and molybdenum. First, the main reagents and equipment hydrochloric acid - potassium chloride buffer solution: 0.2N hydrochloric acid solution and 0.2N potassium chloride solution mixed to form a buffer solution pH1.8;