Sediment-Water Interactions in Anoxic Freshwater Sediments: Mobility of Heavy Metals and Nutrients

Overview

Aquatic sediments are important sinks of inorganic and organic pollutants as well as of nutrients in highly industrialized and densely populated areas. As many aquatic organisms live in or on the sediments, polluted sediments provide a pathway for the chemicals to food-chain organisms, and finally to man. Sediment-water interactions play a fundamental role in biogeochemical cycling of the elements. One of the most important reactions is the mineralization of organic matter during early diagenesis, which not only ...

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Overview

Aquatic sediments are important sinks of inorganic and organic pollutants as well as of nutrients in highly industrialized and densely populated areas. As many aquatic organisms live in or on the sediments, polluted sediments provide a pathway for the chemicals to food-chain organisms, and finally to man. Sediment-water interactions play a fundamental role in biogeochemical cycling of the elements. One of the most important reactions is the mineralization of organic matter during early diagenesis, which not only leads to anoxic conditions connected with a recycling of nitrate, phosphate, and ammonia but changes the chemical bonding of heavy metals into more soluble species. Our study carried out on freshwater sediments enabled us to show whether heavy metals and nutrients are released into the overlying water under changes in physicochemical conditions. The information is important to water management and sediment dredging activities in harbour areas.

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Product Details

Table of Contents

1 Abstract 1
2 Introduction 3
2.1 Early diagenesis 3
2.2 Behaviour of heavy metals and nutrients during early diagenesis 6
2.3 Methods used in the study of early diagenesis 7
3 Methods and materials 9
3.1 Location of the study area 9
3.2 Sampling 14
3.3 Analysis 14
4 Results and discussion 17
4.1 Early diagenesis in the sediments of the Neckar River and its tributaries 17
4.2 Distribution of heavy metals between sediments and porewater 54
4.3 Mobilization of heavy metals 72
4.4 Early diagenesis and heavy metal mobility in other freshwater sediments: a comparison 80
4.5 Comparison of the early diagenesis in freshwater and marine sediments 100
Conclusions 101
References 103
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