Phosphorus release from coastal sediments: Impacts of the oxidation-reduction potential and sulfide

Yi, So-yŏn; Sheng, Yanqing; Yang, Jian; Burton, Edward D.

Phosphorus release from coastal sediments: Impacts of the oxidation-reduction potential and sulfide

2016

Yi, So-yŏn | Sheng, Yanqing | Yang, Jian | Burton, Edward D.

The release of phosphorus (P) from benthic sediments can affect the P content, nutrient status and quality of overlying waters in coastal ecosystem. This study was carried out to investigate the influence of oxidation-reduction potential (ORP) and sulfide on P release from sediments in the coastal estuary of the Yuniao River, China. The results showed that ferric iron-bound P was the main P burial phase in the sediments. The P concentration in overlying water increased with ORP decrease and sulfide increase, displaying a significant linear correlation with the ORP and sulfide concentration. The results indicate that decreased ORP may elevate the zero equilibrium phosphorus concentration, enhancing the capability of P release. And increased sulfide may react or capture reactive iron in sediments, reducing the P adsorption capacity and accelerating P release. Therefore, the control of ORP and sulfide production is important in the sink/source conversion of P in coastal sediments.

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