Abstract
The electrothermal atomizer was installed in a Varian AA240FS AAS. This equipment was tested for determination of arsenic by hydride generation – atomic absorption method in water samples in the low μg/l range. Pre-reduction capability of KI investigated systematically and obtained as 2.5 %. Analytical parameters, that influencing for hydride formation NaBH4 and HCl concentrations are optimized and employed as 0.5 % and 8 mol/l accordingly.The detection limit for determination of arsenic by optimized HG-AAS with electrically heated atomizer was 0.3 μg/l. The accuracy is confirmed by optimized HG-AAS method with flame atomizer and by ICP-MS.Water samples were taken from the different places of Tuul river and from groundwater in the same area. It was found that the arsenic concentration in the river was low, around 3 ppb. The concentration of arsenic in groundwater was around the detection limit of method and no detectable amount of arsenic was found in the other. Concentration of arsenic in the Tuul river in these districts does not seem to be so high that it could affect the people living there. DOI: http://dx.doi.org/10.5564/pmas.v0i4.50 Proceedings of the Mongolian Academy of Sciences 2009 No.4 pp.78-85
Highlights
Arsenic is among the top 20 most toxic substances in the world and can lead to wide range of health problems in humans
Living organisms are exposed to the toxic arsenic species from food and water
The contamination of groundwater with arsenic has already been reported in 20 countries, out of which four major instances are from Asia: Bangladesh, India, Taiwan and Inner Mongolia [1]
Summary
Arsenic is among the top 20 most toxic substances in the world and can lead to wide range of health problems in humans Their concentrations in the environment vary, partly in relation to geology and partly as a result of human activities. Concentration of arsenic in river waters are low, typically in the range 0.1-2.0 μg/l. To detect low concentration of arsenic in water samples sensitive methods such as, hydride generation technique linked with AAS widely used. The purpose of this study was to optimize and improve a method that was used for determining arsenic at the low ppb level in water samples and determine concentration of arsenic in Tuul river. All samples were collected in 100 ml polyethylene flasks and acidified with 1 ml hydrochloric acid in laboratory to preserve trace metals
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