The Differences in Thermal Breakdown of H2PtC16 and cisPt( NH3)2C12 in Carbon Furnace Atomic Absorption.
A study using a combination of thermogravimetric and x-ray diffraction analyses has shown that a solution of hexachloroplatinic acid (Hj'tCI(), usually used as a standard in atomic absorption spectrophotometric (AAS) measurements, was broken down to yield volatile PtCt before being converted...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English English |
| Published: |
1989
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| Online Access: | http://psasir.upm.edu.my/id/eprint/2808/1/The_Differences_in_Thermal_Breakdown_of_H2PtC16_and_cis.pdf http://psasir.upm.edu.my/id/eprint/2808/ |
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| Summary: | A study using a combination of thermogravimetric and x-ray diffraction analyses has shown that a solution
of hexachloroplatinic acid (Hj'tCI(), usually used as a standard in atomic absorption spectrophotometric (AAS)
measurements, was broken down to yield volatile PtCt before being converted to metallic platinum. On the
other hand, a solution of cis-diaminodichloroplatinum(II) (cis-Pt(NH)zClz ; cis-DDP) was converted to metallic
platinum in a single step. The differences in their thermal decomposition mechanisms could be one of the leasons
as to why carbon furnace atomic absorption spectrophotometric (CFAAS) signal from Hj'tCI~ was found to
be lower than that of cis-DDP in aqueous solution.
INTRODUCTION Studies by earlier workers have shown differences in absorbance signals of platinum from
different platinum complexes when analyses
by flame AAS technique. For example, the
platinum absorbance of ( H4)2PtC14 (50 ppm)
is about twofold greater than that of ~PtCI6
(Macquet and Theophanides 1974) and the
cis-DDP signal is about 12% higher than that of
H2PtCI6 (Macquet et al. 1974). These differences
are said to be due to the differences in
thermal stability of the complexes. The ability
of the more stable complex to survive as volatile
species in the flame is greater than the less
stable complexes; a volatile species is more easily
decomposed to free atoms hence a higher AAS
signal is obtained. (Macquet and Theophanides
1975 |
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