石墨炉原子吸收光谱法测定茶叶中的铅 试读结束,如需阅读或下载,请点击购买>;原发布者:易发表网石墨炉原子吸收光2113谱法测定茶叶5261中的铅摘要:采用石墨炉原4102子吸收光谱法测定茶叶中的铅含量1653,并优化了试验条件?确定了测定铅的最佳基体改进剂为磷酸二氢铵,灰化温度为700℃?原子化温度为1450℃?该方法的测定范围为0~50 μg/L,最低检出限为0.003 mg/kg,相对标准偏差为2.52%~5.31%,样品加标回收率为95.5%~104.2%,具有良好的线性关系?精密度和准确度,适用于茶叶中铅的检测分析?关键词:石墨炉原子吸收光谱;基体改进剂;铅;茶叶Determination of Pb in Tea by Graphite Furnace Atomic Absorption SpectroscopyAbstract:The content of Pb in tea was determined after optimizing the pretreatment and instrumental conditions.The optimal modifier was(NH4)H2PO4,ashing and atomization temperature were700℃and 1450℃respectively.The results showed this method had the linear range of 0~50 μg/L,detecting limit of 0.003 mg/kg,RSD of 2.52%~5.31%and recovery rate of 95.5%~104.2%respectively.In a conclusion,it was an accurate and reproductive method for detecting lead in 。
什么是电极石墨化?大直流石墨化,和内串石墨化是什么概念?还有为什么会在这些过程中电极有变形?
原子吸收光谱仪石墨炉和火焰分别适合测试什么元素?二者有啥区别? 原子吸收光谱仪石墨炉和火焰的区别:原子化的方式不同;石墨炉原子化属于电热原子化,后者是火焰高温原子化;