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在 HOAc- Na OAc缓冲溶液中 ,Ba2 +与聚乙二醇 1 0 0 0及四苯硼钠反应生成大分子三元络合物型沉淀 ,据此建立了测定微量钡的浊度分析新体系。钡浓度在 0～ 5.6μg· ml-1范围内符合比耳定律 ,检出限为 0 .0 4μg· ml-1。方法具有灵敏、准确、简便、快捷 ,无须加入分散剂和体系稳定时间长等特点。用于岩石土壤标样中微量钡测定 ,结果满意
In HOAc-NaOAc buffer solution, Ba2 + reacted with polyethylene glycol (100) and sodium tetraphenylborate to form macromolecule ternary complex precipitate. Based on this, a new turbidimetric system for the determination of trace barium . Barium concentration in the range of 0 ~ 5.6μg · ml-1 in line with the Beer’s law, the detection limit of 0. 04μg · ml-1. The method has the characteristics of being sensitive, accurate, simple, quick, without adding dispersant and long stable time of the system. Used for determination of trace barium in rock soil samples with satisfactory results