H. W. SUN ET AL.
Copyright © 2011 SciRes. AJAC
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the element in herb. A n-octanol system can be used to
study the distribution of Pb and Cd in water decoction in
our stomach and intestine. By using NH4H2PO4 as a
modifier for Pb and NH4H2PO4 plus Mg(NO3)2 as a ma-
trix modifier for Cd, the critical pyrolysis temperature
could be raised to 900˚C and 800˚C, respectively, assur-
ing high analytical sensitivity and lower background ab-
sorption. The detection limits of the proposed method for
Pb and Cd were lower than that of FAAS [3,4], GFAAS
[5,6,8,10] and HGAFS methods[11]. The proposed me-
thod is a reliable and effective for the determination of
Pb and Cd in Chinese herbal medicines and their de-
coctions. The distribution of Pb and Cd in water decoc-
tion at stomach and intestine acidities was developed in
the first time. The proposed method can help us make a
further study on the chemical and biological behaviors,
regularity of elements movement and toxicity of Pb and
Cd in Chinese herbal medicines, and gives some advice
on Chinese traditional herbs’ plant and use.
5. Acknowledgements
We express thanks to the Natural Science Foundation of
Hebei province of China for much support to the studied
subject (B2008000583).
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