Accession Number : ADA295076

Title :   Environmental Effects of Dredging. Determination of Total Organic Carbon in Estuarine Leachate Samples.

Descriptive Note : Technical notes,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

PDF Url : ADA295076

Report Date : MAY 1995

Pagination or Media Count : 9

Abstract : Distinct differences in leaching characteristics of fresh-water and estuarine sediments have been observed and documented (Brannon and others 1991; Lee and others 1993a,b,c; Myers and Brannon 1993). Anaerobic leaching of fresh-water sediments with distilled-deionized (DDI) water produces aqueous leachate samples relatively free of microparticulates (Brannon, Myers, and Price 1992). Conventional liquid injection procedures (American Public Health Association 1989, U.S. Environmental Protection Agency 1986) for TOC determination are analytically sound for these leachate samples. Column leaching of estuarine sediments with DDI water initially produces microparficulate-free leachate samples. After leaching several pore volumes, leachate samples containing nonfilterable colloids and nonsettleable microparticulate matter are obtained (Lee and others 1993a,b,c). Analysis of these samples for metals and organic species using standard procedures presents no major obstacles. However, analysis of these samples for TOC using standard techniques has been subject to error due to the nonhomogeneity of the samples and the dispersion of TOC in both water and colloid phases. pg2. JMD

Descriptors :   *CARBON, *ENVIRONMENTAL IMPACT, *CONTAMINATION, *DREDGING, *SEDIMENTS, *LEACHING, *ESTUARIES, INJECTION, LIQUIDS, WATER, ORGANIC MATERIALS, ERRORS, SAMPLING, COLLOIDS.

Subject Categories : Environmental Health and Safety
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE