论文部分内容阅读
痕量铬的测定,通常采用二苯氨基脲法,其摩尔吸光系数为3.4×10~4。但采用三苯甲烷类碱性染料乙基紫测定痕量铬(Ⅵ)尚未见文献报道。我们在实验中发现,在弱酸性介质中,Cr~+与菸酸和乙基紫能够生成易于被混合溶剂(苯:丁酮=4:1)萃取的蓝色缔合物,其摩尔吸光系数为8.01×10~4本文研究了该络合物的形成条件,共存离子的影响,络合物的组成。实验表明该法可用于合成试样中铬
Determination of trace chromium, usually diphenylsemicarbazide method, the molar absorption coefficient of 3.4 × 10 ~ 4. However, the determination of trace chromium (Ⅵ) by using triphenylmethane basic dye ethyl violet has not been reported in the literature. We found in experiments that Cr + and nicotinic acid and ethyl violet can generate blue complex easily extracted by mixed solvent (benzene: butanone = 4: 1) in weak acid medium, and its molar absorption coefficient Is 8.01 × 10 ~ 4 In this paper, the formation conditions of the complex, the influence of coexisting ions and the composition of the complex were studied. Experiments show that the method can be used for the synthesis of chromium in the sample