论文部分内容阅读
前文报道了非离子表面活性剂对结晶紫-磷钼杂多酸显色反应的影响,曾指出,非离子表面活性剂能与杂多酸生成离子缔合物,参与了一系列竞争反应,导致显色体系有褪色的倾向。本文则企图以结晶紫-砷钼酸体系为例,进一步验证上述的论点。仪器及试剂砷标准溶液用As_2O_3按常规法配制,每毫升含100μg及2μg砷。其余试剂及仪器与前文同。乳化剂OP对结晶紫(CV)-砷钼酸反应的影响于含4.0μg As的数份试液中,分别加入不同量的1.5mol/L硫酸,2mL 0.05mol/L钼酸铵溶液,
The foregoing reports the effect of nonionic surfactants on the color reaction of crystal violet-phosphomolybdic heteropolyacid. It has been pointed out that nonionic surfactants can form ion-association with heteropoly acid and participate in a series of competition reactions, leading to Color system tends to fade. This paper attempts to crystal violet - arsenic molybdenum system as an example to further verify the above argument. Equipment and reagents Arsenic standard solution with As_2O_3 prepared by conventional methods, each containing 100μg and 2μg arsenic. The remaining reagents and instruments with the same as before. Effect of emulsifier OP on the reaction of crystal violet (CV) -artemolybdic acid In different test solutions containing 4.0μg As, different concentrations of 1.5mol / L sulfuric acid, 2mL 0.05mol / L ammonium molybdate solution,