کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5757858 | 1622722 | 2016 | 6 صفحه PDF | دانلود رایگان |
- Phosphorus release from coastal sediments was investigated.
- Phosphorus concentration increased with ORP decrease and sulfide increase.
- Decreased ORP may elevate the zero equilibrium phosphorus concentration.
- Sulfide existence or production may enhance the P release.
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.
Journal: Marine Pollution Bulletin - Volume 113, Issues 1â2, 15 December 2016, Pages 176-181