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矿物中低含量磷的测定前人做了大量工作.利用锑(Ⅲ)与磷(Ⅴ)和钼(Ⅵ)形成三元杂多酸(亦称三元络合物),用抗坏血酸等还原剂还原后形成磷锑铝杂多篮藉以进行分光光度法测定,较以前的方法有所改进.但仍然存在一些不足之处,主要是受气温影响大.温度低了三元杂多蓝的溶解度迅速变小,生成絮状沉淀,影响分析工作的正常进行.本文研究了加入溶剂丙酮以加速显色和增大三元杂多蓝的溶解度,从而提高了显色的速度和有色物质的稳定性,收到了满意的效果;同时还研究了三元杂多蓝的组成以及显色剂的选择.
A lot of work has been done on the determination of low content of phosphorus in minerals, and ternary heteropoly acid (also ternary complex) is formed by using antimony (Ⅲ), phosphorus (Ⅴ) and molybdenum (Ⅵ) After the reduction of the formation of phosphorus antimony aluminum heteropoly basket for spectrophotometric determination, compared with the previous method has been improved, but there are still some shortcomings, mainly affected by temperature .Low temperature ternary heteropoly blue solubility rapidly Become smaller and generate flocculent sediment, affecting the normal work of analysis.In this paper, the solvent acetone was added to accelerate the color development and increase the solubility of ternary heteropoly blue so as to improve the color developing speed and the stability of the colored materials, Received satisfactory results; also studied the composition of ternary heteropoly blue and the choice of developer.