生源要素磷的生态功能受其赋存形态影响，金属阳离子和DO影响其赋存形态转化，故推断渔药CuSO₄和CaO₂影响磷的赋存形态。为验证这一假说，分别在充气和不充气的条件下将海水和沉积物分别暴露于浓度为0、0.35、0.70、1.05 mg/L的CuSO₄和浓度为0、5.00、35.00、50.00 mg/L的CaO₂中，21 d后测定上覆海水和间隙水的总磷(TP)、活性磷酸盐(IP)浓度，沉积物中的总磷(TP)、盐酸可浸取态磷(HCl-P)、可交换态磷(Ex-P)含量。结果表明：充气时，CuSO₄降低上覆水IP浓度和沉积物TP含量，增加沉积物Ex-P含量；不充气时，CuSO₄降低上覆水TP浓度和沉积物TP、Ex-P含量，增加间隙水IP浓度；充气时，过氧化钙降低上覆水IP、TP浓度，增加沉积物HCl-P和Ex-P含量；不充气时，过氧化钙降低上覆水TP浓度，增加间隙水IP浓度和沉积物Ex-P含量。因此，CuSO₄和CaO₂将水体中磷封存于沉积物，有降低水体IP的潜力。

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.