Effect of oxidation-reduction potential on flocculation and mobility of metals in an estuarine environment

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science Pub Date : 2025-06-02 DOI:10.1016/j.rsma.2025.104278

Seyed Mohamadjavad Taghavi, Touraj Nasrabadi, Fatemeh Kachoueiyan, Abdolreza Karbassi

引用次数: 0

Abstract

This study examined the self-purification capacity of the Polrud River estuary and Caspian Sea in removing metals through flocculation at varying oxidation-reduction potential (ORP) levels. Flocculation was investigated under normal and enhanced ORP conditions across salinities of 0.5–2.1 PSU. Zn had the greatest flocculation rate of 51.3 %, while Pb had the lowest rate of 2.5 %. The rise in ORP led to increased Pb, Mn, and Ni flocculation rates by 21.6 %, 11.3 %, and 8.8 %, respectively. Flocculation rate of Zn and Cu decreased by 4.1 % and 2.4 % since salinity controlled their behavior. Moreover, being mostly correlated with ORP and pH, the mobility of metals in sediments followed the order: Mn> Ni> Zn> Pb> Cu. Mobility of studied metals increased with the increase in ORP or the decrease in pH.

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氧化还原电位对河口环境中金属絮凝和迁移的影响

本研究考察了不同氧化还原电位（ORP）水平下污染河河口和里海的自净化能力。在0.5-2.1 PSU的盐度范围内，研究了正常ORP和增强ORP条件下的絮凝效果。Zn的絮凝率最高，为51.3 %，Pb的絮凝率最低，为2.5 %。ORP的增加使Pb、Mn和Ni的絮凝率分别提高了21.6% %、11.3 %和8.8 %。由于盐度控制Zn和Cu的行为，它们的絮凝率分别下降了4.1 %和2.4 %。沉积物中金属的迁移率顺序为：Mn>； Ni>； Zn>； Pb>； Cu，主要与ORP和pH相关。所研究金属的迁移率随ORP的增加或pH的降低而增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Regional Studies in Marine Science Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics

CiteScore

3.90

自引率

4.80%

发文量

336

审稿时长

69 days

期刊介绍： REGIONAL STUDIES IN MARINE SCIENCE will publish scientifically sound papers on regional aspects of maritime and marine resources in estuaries, coastal zones, continental shelf, the seas and oceans.