Accession Number : ADA041468
Title : Transformations of Heavy Metals and Plant Nutrients in Dredged Sediments as Affected by Oxidation Reduction Potential and pH. Volume 1. Literature Review
Descriptive Note : Final rept.
Corporate Author : LOUISIANA STATE UNIV BATON ROUGE AGRICULTURAL EXPERIMENT STATION
Personal Author(s) : Khalid, R A ; Gambrell, R P ; Verloo, M G ; Patrick, Jr, W H
Report Date : May 1977
Pagination or Media Count : 245
Abstract : This report discusses the literature on the occurrence and chemistry of selected trace metals and plant nutrients in sediment-water systems. The effects of pH and oxidation-reduction conditions on metal and nutrient chemistry were stressed. The toxic and nutrient elements included are lead, cadmium, mercury, arsenic, selenium, copper, zinc, manganese, iron, nitrogen, phosphorus, and sulfur. The report also reviews the scope and limitations of various selective chemical fractionation procedures developed to determine the chemical forms of trace metals and nutrients in soil and sediment-water systems. Many laboratory studies simulating the transport of reduced sediments to an oxygenated environment have reported some release of toxic metals and biostimulants and others have shown no release of many elements. However, too few studies of actual dredging and dredged material disposal operations have been completed to draw broadly applicable conclusions regarding the effects of dredging on water quality. Where dredging activities have resulted in minimal change in metal ion concentration, it may be that some regulating processes influenced by oxidation-reduction reactions tend to be activated as others are inactivated.
Descriptors : *AQUATIC PLANTS , *HEAVY METALS , *DREDGED MATERIALS , *OXIDATION REDUCTION REACTIONS , BIBLIOGRAPHIES , NUTRIENTS , PLANT GROWTH , LABORATORY PROCEDURES , ECOSYSTEMS , WASTE DISPOSAL , SOLUBILITY , WATER QUALITY , SEDIMENTS , CHEMICAL ANALYSIS , PH FACTOR , TRANSFORMATIONS , TRACE ELEMENTS , ADSORPTION , LITERATURE SURVEYS , WATER CHEMISTRY , SIMULATION , TOXIC HAZARDS
Subject Categories : Toxicology
Distribution Statement : APPROVED FOR PUBLIC RELEASE