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建立了采用氢化物发生原子吸收法直接测定包头铁矿中微量铅的方法。对铅氢化物发生和测定条件进行了优化。当采用Clark-Lubs缓冲溶液控制氢化物发生体系的最佳酸度为pH1.0-1.5,共存酸的允许量明显增加。系统研究了包头铁矿中共存元素对铅测定的影响,采用邻菲啰啉、草酸联合掩蔽消除共存元素的干扰?梅椒斐鱿尬?.88 ng/mL,对包头铁矿标准样品进行测定,结果与认定值吻合。
A method for direct determination of trace lead in Baotou iron ore by hydride generation atomic absorption spectrometry was established. Lead hydride generation and measurement conditions were optimized. When using the Clark-Lubs buffer solution to control the optimum acidity of the hydride generation system to be pH 1.0-1.5, the allowable amount of coexistent acid is significantly increased. The influence of coexisting elements in Baotou Iron Mine on the determination of lead was systematically studied. The interference of coexisting elements with phenanthroline and oxalic acid was masked to eliminate the interference of coexisting elements. Determination, the results agreed with the certified value.