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作者:

Zhao, Li-Jiao (Zhao, Li-Jiao.) (学者:赵丽娇) | Ren, Ting (Ren, Ting.) | Zhong, Ru-Gang (Zhong, Ru-Gang.) (学者:钟儒刚)

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Scopus SCIE

摘要:

The content of lead in human hair was measured by high resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS) combined with microwave-assisted digestion (MAD) and direct solid sampling (DSS). Hair strands were washed, dried, and then cut into three parts (root, middle portion, and tip). For MAD-GFAAS assays, approximately 0.25 g of hair was completely digested using a mixture of concentrated nitric acid and hydrogen peroxide in a closed system. In the DSS-GFAAS assays, 0.1-0.2 mg of dried hair was directly introduced into a graphite furnace using a solid autosampler. The temperature programs were optimized and the effects of various added modifiers were compared. The results indicated that NH4H2PO4 was the optimal modifier for analysis of Pb using GFAAS. Use of the optimal modifier and temperature program gave similar limits of detection for MAD-GFAAS and DSS-GFAAS of 1.16 ng/g and 0.82 ng/g, respectively. Both methods also produced satisfactory recoveries ranging from 98.69% to 103.14%. There was no significant difference observed between the Pb contents of hair strands determined by the MAD-GFAAS and DSS-GFAAS assays, which both indicated that the Pb levels increased along the hair strands. Comparison of the two methods revealed that DSS-GFAAS had several advantageous characteristics over MAD-GFAAS, including the need for much less sample material and having a less time-consuming procedure, lower sample blank absorbance, lower memory effect, and no risk of environmental pollution by digesting chemicals. The direct solid sampling technique can be employed as a good alternative to conventional wet digestion in AAS assays.

关键词:

Direct solid sampling Microwave-assisted digestion Human hair High resolution continuum source graphite furnace atomic absorption spectrometry Lead

作者机构:

  • [ 1 ] [Zhao, Li-Jiao]Beijing Univ Technol, Coll Life Sci & Bioengn, Beijing 100124, Peoples R China
  • [ 2 ] [Ren, Ting]Beijing Univ Technol, Coll Life Sci & Bioengn, Beijing 100124, Peoples R China
  • [ 3 ] [Zhong, Ru-Gang]Beijing Univ Technol, Coll Life Sci & Bioengn, Beijing 100124, Peoples R China

通讯作者信息:

  • 赵丽娇

    [Zhao, Li-Jiao]Beijing Univ Technol, Coll Life Sci & Bioengn, Beijing 100124, Peoples R China

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来源 :

ANALYTICAL LETTERS

ISSN: 0003-2719

年份: 2012

期: 16

卷: 45

页码: 2467-2481

2 . 0 0 0

JCR@2022

ESI学科: CHEMISTRY;

JCR分区:4

中科院分区:4

被引次数:

WoS核心集被引频次: 26

SCOPUS被引频次: 28

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