论文部分内容阅读
硫氰酸盐测定低含量钨的方法有关氟化钙的干扰及消除,资料报导不一。毛主席教导说:“分析的方法就是辩证的方法”。我们从试验实践中认识到,氟化钙的干扰表现在两个方面:钙的吸附和氟对显色的影响。实验表明,单加三氯化铝于比色液中,不足以克服氟的干扰,用三氯化铝抽取去氟化钙的方法,流程过长,钨也可能损失。我们采用EDTA络合钙或将钙转化为碳酸钙的沉淀克服了吸附问题;提高显色酸度和硫氰化钾浓度克制了钨
Thiocyanate method for determination of low levels of tungsten on the interference and elimination of calcium fluoride, the data reported different. Chairman Mao taught: “The method of analysis is the dialectical method.” We know from experimental practice that calcium fluoride interference manifests itself in two aspects: the adsorption of calcium and the effect of fluorine on color development. Experiments show that a single aluminum trichloride in the colorimetric solution, not enough to overcome the interference of fluorine, with aluminum trichloride extraction of calcium fluoride method, the process is too long, tungsten may also be lost. We use EDTA complexation of calcium or calcium into calcium carbonate precipitation to overcome the adsorption problems; improve the color of acidity and potassium thiocyanate concentration restraint of tungsten