Heavy Metals in Agricultural Lands Receiving Chemical Sewage Sludges PDF Download

Author: Jon Clement Van Loon
Publisher:
ISBN:
Category : Heavy metals
Languages : en
Pages : 52

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Book Description
This report reviews existing and newly developed analytical methods for sewage sludge analysis. ft had been stressed earlier that knowledge of the form of metals in waste and environmental samples is of great importance. As a result of this the development of simple equipment and analytical methods to initiate metal speciation has been stressed. Procedures developed earlier and used provisionally have been studied in depth. The mercury method is now acceptable as recorded. The As/Se procedure has been modified as a result of further investigation. Nonflame atomic absorption methods have been developed for silver and vanadium. It is demonstrated that using atomic absorption spectroscopy as a detector does not guarantee a quick solution to metal speciation problems. Sludges can be dry-ashed at 450°C without fear of Joss of cadmium, lead or appreciable amounts of zinc. When aluminum is to be determined, dry-ashing should not be used. Data also make it clear that incineration at temperatures usually employed will release large amounts of arsenic, cadmium, lead, mercury and zinc. A number of sewage sludges were analyzed, and the results are tabulated.