Speciation of inorganic arsenic and selenium in leachates from landfills in relation to water quality assessment
| Autor: | A. M. Yusof, A. K. H. Wood, S. Salleh |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Chemistry
Spectrum Analysis Endocrinology Diabetes and Metabolism Biochemistry (medical) Clinical Biochemistry Radiochemistry Water chemistry.chemical_element General Medicine Alkali metal Biochemistry Arsenic Refuse Disposal Inorganic Chemistry Selenium chemistry.chemical_compound Environmental chemistry Ammonium Leachate Water quality Water Pollutants Chemical Masking agent Waste disposal |
| Zdroj: | Biological Trace Element Research. :139-148 |
| ISSN: | 1559-0720 0163-4984 |
| DOI: | 10.1007/bf02784200 |
| Popis: | Speciation of arsenic and selenium was carried out on water samples taken from rivers used as water intake points in the vicinity of landfill areas used for land-based waste disposal system. Leachates from these landfill areas may contaminate the river water through underground seepage or overflowing, especially after a heavy downpour. Preconcentration of the chemical species was done using a mixture of ammonium pyrrolidinethiocarbamate-chloroform (APDTC-CHCl3). Because only the reduced forms of both arsenic and selenium species could be extracted by the preconcentrating mixture, suitable reducing agents such as 25% sodium thiosulfate for As(III) and 6M HCl for Se(IV) were used throughout the studies. Care was taken to exclude the interfering elements such as the alkali and alkali earth metals from the inorganic arsenic and selenium species by introducing 12% EDTA solution as the masking agent. The extracted mixture was irradiated in a thermal neutron flux of 4 x 10(12)/cm/s from a TRIGA Mk.II reactor at the Malaysia Institute of Nuclear Technology Research (MINT). Gamma rays of 559 keV and 297 keV from 76As and 75Se, respectively, were used in the quantitative determination of the inorganic species. Mixed standards of As(III) and Se(IV) used in the percentage efficiency procedure were prepared from salts of Analar grade. The water quality evaluation was viewed from the ratio of the inorganic species present. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink