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Effects of CuSO4 and CaO2 on the Forms of Phosphorus in Seawater and Sediments
HUANG Guifang, WEI Xiangtao, LI Linwei, LIANG Jiening, BAI Weihao, GE Changzi
PDF(1243 KB)
PDF(1243 KB)
Effects of CuSO4 and CaO2 on the Forms of Phosphorus in Seawater and Sediments
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.
calcium peroxide / exchangeable phosphorus / copper sulfate / hydrochloric acid leachable phosphorus / total phosphorus {{custom_keyword}} /
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PDF(1243 KB)
图1 CuSO4下上覆水TP浓度图2 CuSO4下上覆水IP浓度图3 CaO2下上覆水TP浓度图4 CaO2下上覆水IP浓度图5 CuSO4下间隙水TP浓度图6 CuSO4下间隙水IP 浓度图7 CaO2下间隙水TP浓度图8 CaO2下间隙水IP浓度图9 CuSO4下沉积物TP含量图10 CuSO4下沉积物HCl-P含量图11 CuSO4下沉积物Ex-P含量图12 CaO2下沉积物TP含量图13 CaO2下沉积物HCl-P含量图14 CaO2下沉积物Ex-P含量图15 CuSO4下上覆水pH经时变化图16 CaO2下上覆水pH经时变化/
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