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Citation: Dai Qingshan, Yao Jinyu, Xie Wenbing, Wang Guoping. Effect of NH₄H₂PO₄ on The Ashing and Atomization of Cd in GFAAS[J]. Chinese Journal of Applied Chemistry, ;1996, 13(5): 85-87. shu

Effect of NH₄H₂PO₄ on The Ashing and Atomization of Cd in GFAAS

1.
Changckun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Received Date: 22 November 1995
Available Online: 24 June 1996

A kinetic approach and other informations were employed to study the mechanism of Cd ashing and atomization when NH₄H₂PO₄ was used as a modifier. During the pyrolysis stage Cd_x(PO₃)_n produced and a large amount of NH₄H₂PO₄ dehydrated to form metaphosphate with chain or ring shape. This may result in the physical embedment of Cd. So both chemical and physical factors lead to the rise of the pyrolysis temperature. During the atomization stage, the analyte atomization was considered to be governed by the decomposition of this meta phosphate.
- graphite furnace atomic absorption spectrometry,
- kinetic model,
- Arrhenius plot
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Effect of NH₄H₂PO₄ on The Ashing and Atomization of Cd in GFAAS