采用纳米 TiO2 涂层石英管原子化器和氢化物发生原子吸收光谱法测定中草药和头发中的汞和硒。

Determination of mercury and selenium in herbal medicines and hair by using a nanometer TiO2-coated quartz tube atomizer and hydride generation atomic absorption spectrometry.

机构信息

Department of Chemistry & Environmental Science, Zhangzhou Normal University, Zhangzhou 363000, China.

出版信息

J Hazard Mater. 2011 May 15;189(1-2):609-13. doi: 10.1016/j.jhazmat.2011.02.019. Epub 2011 Feb 15.

DOI:10.1016/j.jhazmat.2011.02.019

Abstract

The nanometer TiO(2) particle was coated onto the inner wall of a T-shaped quartz tube atomizer (QTA) and then was used as a new atomizer (NT-QTA) for the determination of Hg and Se by hydride generation atomic absorption spectrometry (HGAAS). After coating 67.4 mg TiO(2) on a quartz tube, the analytical performance of NT-QTA-HGAAS was compared to conventional QTA-HGAAS and it was improved as follows: (a) the linear range of the calibration curves was expanded from 10.0-80.0 ng mL(-1) to 5.0-150.0 ng mL(-1) for Hg, and from 10.0-70.0 ng mL(-1) to 5.0-100.0 ng mL(-1) for Se; (b) the characteristic concentration of was decreased from 2.8 ng mL(-1)/1% to 1.1 ng mL(-1)/1% for Hg and from 1.2 ng mL(-1)/1% to 0.8 ng mL(-1)/1% for Se; and (c) the interference from the coexistence of As on the determination of Hg and Se could be eliminated. The achieved technique was applied for the determination of Hg and Se in herbal medicines and hair.

摘要

纳米 TiO(2) 颗粒被涂覆在 T 形石英管雾化器 (QTA) 的内壁上，然后用作氢化物发生原子吸收光谱法 (HGAAS) 测定 Hg 和 Se 的新型雾化器 (NT-QTA)。在石英管上涂覆 67.4 mg TiO(2) 后，将 NT-QTA-HGAAS 的分析性能与传统的 QTA-HGAAS 进行了比较，结果得到了以下改进：(a) Hg 的校准曲线线性范围从 10.0-80.0 ng mL(-1)扩展到 5.0-150.0 ng mL(-1)，Se 的线性范围从 10.0-70.0 ng mL(-1)扩展到 5.0-100.0 ng mL(-1)；(b)Hg 的特征浓度从 2.8 ng mL(-1)/1%降低到 1.1 ng mL(-1)/1%，Se 的特征浓度从 1.2 ng mL(-1)/1%降低到 0.8 ng mL(-1)/1%；(c)消除了共存的 As 对 Hg 和 Se 测定的干扰。该技术已应用于中草药和头发中 Hg 和 Se 的测定。