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This document summarizes a study that tested different acid digestion procedures for extracting metals from soils and sewage sludges. The researchers found that refluxing samples with aqua regia (a mixture of nitric and hydrochloric acids) was more effective than open vessel digestion and produced results comparable to bomb digestion, the most vigorous method tested. Refluxing with aqua regia extracted at least 80% of the total chromium, copper, lead and manganese from sewage sludges and sludge-treated soil

Author

Elis

Language

EN