DTIC ADA161948: Sample Digestion and Drying Techniques pdf

DTIC ADA161948: Sample Digestion and Drying Techniques

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Mercury in soils and sediments can be accurately determined over the concentration range of 0.04 to 2 micrograms Hg/g using amalgamation on thin gold films. Relative standard deviation of analysis is about 10%. A mild sample dissolution technique, involving HNO3 at 75 C, produced quantitative Hg recoveries for certified sediment samples and recoveries equivalent to those of rigorous Parr-bomb digestions for other soil and sediment samples. Oven drying of samples at 150 C resulted in significant losses of Hg from both soil and sediment samples. Air drying, oven drying at 60 C or freeze drying resulted in Hg recoveries that agreed within 20% of those for undried samples. Thus, any one of these three comparable methods is recommended for Hg determinations in soils and sediments. Keywords: Chemical analysis; Volatilization

• Creator/s: Defense Technical Information Center
• Date: 9/1/1985
• Year: 1985
• Book Topics/Themes: DTIC Archive, Cragin, James H., COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH, *SOILS, *MERCURY, RECOVERY, OPTIMIZATION, AIR, METAL FILMS, THIN FILMS, FREEZE DRYING, SAMPLING, VOLATILITY, GOLD, STANDARD DEVIATION, SEDIMENTS, CHEMICAL ANALYSIS, GEOCHEMISTRY, SOIL TESTS, CONCENTRATION(CHEMISTRY), DRYING, CHEMICAL DETECTION, OVENS, AMALGAMS

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