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Method 7471B Mercury in Solid or Semisolid Waste (Manual Cold-Vapor Technique)

By Environmental Protection Agency

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Book Id: WPLBN0000000269
Format Type: PDF eBook
File Size: 0.1 MB
Reproduction Date: 2007

Title: Method 7471B Mercury in Solid or Semisolid Waste (Manual Cold-Vapor Technique)  
Author: Environmental Protection Agency
Volume:
Language: English
Subject: Ecology, Natural resource issues, Environemtal protection
Collections: Environmental Awareness Library Collection
Historic
Publication Date:
Publisher: United States Environmental Protection Agency

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Agency, E. P. (n.d.). Method 7471B Mercury in Solid or Semisolid Waste (Manual Cold-Vapor Technique). Retrieved from http://worldlibrary.org/


Description
Excerpt: 1.0 SCOPE AND APPLICATION 1.1 Method 7471 is approved for measuring total mercury (organic and inorganic) in soils, sediments, bottom deposits, and sludge-type materials. All samples must be subjected to an appropriate dissolution step prior to analysis. If this dissolution procedure is not sufficient to dissolve a specific matrix type or sample, then this method is not applicable for that matrix. 2.0 SUMMARY OF METHOD 2.1 Prior to analysis, the solid or semi-solid samples must be prepared according to the procedures discussed in this method. 2.2 This method is a cold-vapor atomic absorption method and is based on the absorption of radiation at the 253.7-nm wavelength by mercury vapor. The mercury is reduced to the elemental state and aerated from solution in a closed system. The mercury vapor passes through a cell positioned in the light path of an atomic absorption spectrophotometer. Absorbance (peak height) is measured as a function of mercury concentration.

 

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