L′vov平台技术用于石墨炉原子吸收光谱法测定牙膏中的铅  

GFAAS Determination of Trace Lead in Toothpaste Using L′vov Platform

作　　者：张巽[1,2] 李彬贤[1,2] 高卫民[1,2] 张玉根 

机构地区：[1]中国科学技术大学地球和空间科学系 [2]第三世界科学院中国科学技术大学地球和天文学高级研究中心

出　　处：《光谱学与光谱分析》1999年第3期388-391,共4页Spectroscopy and Spectral Analysis

摘　　要：用石墨炉原子吸收法测定低含量元素时，平台技术可有效地提高测定的灵敏度。本文从平台的制作到平台涂层的选择，以及对不同石墨管加入平台后的效果作了比较。利用平台技术对牙膏中痕量Ｐｂ的灰化温度、原子化温度进行了选择，确定了最佳测试条件，讨论了加入平台后，基体中大量的Ｃａ、Ａｌ对痕量Ｐｂ测定影响的消除。用本文选出的最佳测试条件，对牙膏中痕量Ｐｂ进行了测定，其精度达到０．９％，检出限为１５ｎｇ，比不用平台技术有明显的改进。Sensitivity in determining low melting point metals is highly improved by means of platform technique in graphite furnace AAS.In this paper we describe a method of determining trace lead in toothpaste by this technique.The method of making the platform and the selection of the platform coating were discussed and the results with and without the platform were compared. The optimum ashing temperature,atomization temperature and experimental conditions were investigated.The interference of large amount Al and Ca in the matrix on determination of trace lead can be minimized by using platform technique.The precision of about 0 9 % and detection limit of about 15 ng obtained by this improved method are much better than those by methods without platform.

关 键 词：平台技术 牙膏 铅 测定 石墨炉 原子吸收光谱 

分 类 号：TQ658.41[化学工程—精细化工]