Performance of electrodeposited noble metals as permanent modifiers for the determination of cadmium in the presence of mineral acids by electrothermal atomic absorption spectrometry |
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| Institution: | 1. Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China;2. College of Energy, Xiamen University, Xiamen, People’s Republic of China;3. Institute of Plant Protection and Environmental Protection, Beijing Academy of Agriculture and Forestry Science, Beijing, People’s Republic of China;1. College of Resources & Environment, Hunan Agricultural University, No.1, Nongda Road, Changsha 410128, China;2. Changsha Research Station for Agricultural and Environmental Monitoring, Key Laboratory of Agro–ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, No. 644, Yuanda Road, Changsha 410125, China;3. Agronomy Department, Iowa State University, 716 Farm House Lane, Ames 50011, USA |
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| Abstract: | The analytical performance of electrodeposited noble metals (Pd, Rh or Pd+Rh) on the graphite surface for cadmium determination in the presence of inorganic acids was evaluated and discussed. The study was carried out for 16% HNO3, 28% HCl and a mixture of both acids (aqua regia). It was demonstrated that all electrodeposited modifiers stabilized cadmium up to 800°C in the presence of HNO3 and aqua regia. When only HCl was present in the solution the thermal stability of cadmium was less pronounced, the maximum pyrolysis temperature that could be applied was 500°C. The long-term study for Cd determination shows that permanent performance of electrodeposited modifiers is not influenced by mineral acids, moreover, the tube lifetime was doubled, compared with a non-modified tube, when Pd+Rh were electrodeposited onto the graphite surface. |
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