Analysis for lead in study materials of primary school children such as water colours, clays and crayons.
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Date
1979
Authors
Journal Title
Journal ISSN
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Publisher
University of Colombo: UC(SCI).
Abstract
The estimation of Lead in the samples of water colours, clays and crayons has been carried out using the Dithizone Proce Dure (5) the method adapted by the Sri Lanka standared committee for lead in water colours. The Sri Lanka standard specifies not more than 250 mg/kg of lead for the water colours and mo standared are prescribed for clays and crayona Total of forty one (41) samples of the three materials under study were analysed for their lead concentration and most of the samples had the lead contant within the standard specified for water couloursThe yellow colours of all the materials analysed excepting two makes of water colours, had lead concentration over the standard limit. One of the makes had all the colours with lead concentration lead than10mg/kg.
Description
Dissertation: M.Sc., University of Colombo: UC(SCI), 1979.
Keywords
Water quality
Citation
DE MEL, LSK, Analysis for lead in study materials of primary school children such as water colours, clays and crayons., University of Colombo UC(SCI), 1979: p.