石墨炉原子吸收法测定自来水中的有害元素铅

Determination of a harmful element-lead in water by graphite furnace atomic absorption spectrometry

采用石墨炉原子吸收光谱法,水样处理后加入基体改进剂,测定水中有害元素痕量铅.实验优化了石墨炉原子吸收光谱法的测定条件.重点讨论了铅的灰化温度、原子化温度以及基体改进剂的选用对铅测定结果的影响,结果表明,以磷酸二氢盐、钯盐为基体改进剂可提高灰化温度,消除样品中的钙、镁、钠等复杂基体的干扰,相对标准偏差为2.23%,回收率为94.0%-102.0%,具有良好的精密度和回收率.方法简便快速、结果准确.

The Pb in water was determined by graphite furnace atomic absorption spectrometry with matrix modifier. The optimum conditions for GFAAS determination of Pb with the use of phosphoric acid as chemical modifier were studied . It was found that the Dresenc phosphoric acid and palladium chloride chemical modifier permited a higher ashing temperature and stabilized the signal with RSD of 2.23% and recovery was 94.0% -102.0%. The influence of ash temperature and atomic temperature and the selection of the matrix modifier was also studied. The method is simple and accurate.