Hexavalent chromium extraction from soils: a comparison of five methods

Article Abstract:

The use of the carbonate-hydroxide extraction method and its comparison to other chromium extraction techniques are examined. Maximal dissolution of all chromium forms was achieved and total chromium soil status was established by setting an extraction protocol at 0.28 M Na2CO3 and 0.5 M NaOH with temperature conditions set at 90-95 degrees centigrade for one hour. Unheated carbonate-hydroxide solution, distilled water, pH 7.0 phosphate buffer and alkaline-based sonication exhibited less accurate results for chromium extraction.

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The challenge of remediating chromium-contaminated soil

Article Abstract:

The New Jersey Dept. of Environmental Protection, in coordination with scientists working on Hudson County, NJ, soils, have launched a major effort to understand the effects of chromium contamination on human health and the environment. The research focuses on determining the toxic levels in chromate-bearing slag, also known as chromite ore processing residue (COPR), and developing remediation techniques to reduce the amount of chromium in COPR-enriched soils.

Methods, Environmental aspects, Bioremediation, Soil disinfection, Hudson County, New Jersey

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Extraction of sparingly soluble chromate from soils: evaluation of methods and E(sub h)-pH effects

Article Abstract:

A study aimed at comparing the effectiveness of hot alkaline extraction method (SW-846 Method 3060A) to four others in solubilizing PbCrO4 is presented. The hot alkaline extraction method, which was developed to selectively solubilize Cr(VI), is tested along with the other four methods in five extractants. The five extractants used in the experiment were distilled water, phosphate buffer, carbonate/hydroxide solution, and hydroxide solution.

Research and Development in the Physical, Engineering, and Life Sciences, All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Chemistry, Chromium Compounds, Evaluation

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