Effects of CuSO4 and CaO2 on the Forms of Phosphorus in Seawater and Sediments

doi:10.11924/j.issn.1000-6850.casb2022-0842

Abstract

Abstract:

The ecological function of biogenic element phosphorus is affected by its forms, and metal cations and DO affect its forms transformation. It is inferred that the fish drugs CuSO₄ and CaO₂ affect the phosphorus forms. To test this hypothesis, seawater and sediments were exposed to CuSO₄ at concentrations of 0, 0.35, 0.70 and 1.05 mg/L, and CaO₂ at concentrations of 0, 5.00, 35.00 and 50.00 mg/L respectively under aerated and unaerated conditions. After 21 days, the concentrations of total phosphorus (TP), reactive phosphate (IP) in seawater and the content of total phosphorus (TP), hydrochloric acid leachable phosphorus (HCl-P) and exchangeable phosphorus (Ex-P) in sediments were determined. The results showed that: under aeration, CuSO₄ reduced the IP concentration of overlying water and sediment TP content, and increased the sediment Ex-P content. Without aeration, CuSO₄ reduced the TP concentration and the sediment TP and Ex-P, and increased the IP concentration of gap water. Under aeration, calcium peroxide reduced the overlying IP and TP concentration, and increased the sediment HCl-P and Ex-P. Without aeration, calcium peroxide reduced the overlying TP concentration, and increased the gap water IP concentration and sediment Ex-P content. Thus, CuSO₄ and CaO₂ sequester the phosphorus in water body in sediments, and both of them have the potential to reduce IP in water body.

Key words: calcium peroxide, exchangeable phosphorus, copper sulfate, hydrochloric acid leachable phosphorus, total phosphorus

HUANG Guifang, WEI Xiangtao, LI Linwei, LIANG Jiening, BAI Weihao, GE Changzi. Effects of CuSO₄ and CaO₂ on the Forms of Phosphorus in Seawater and Sediments[J]. Chinese Agricultural Science Bulletin, 2023, 39(13): 79-86.

Figures/Tables 16

References 43

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Effects of CuSO₄ and CaO₂ on the Forms of Phosphorus in Seawater and Sediments

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