四种重金属对刺参幼参的急性致毒效应

Acute Toxicity of Four Heavy Metals Acting on Apostichopus japonicus Juvenile

采用静水试验法，在水温18．5℃～20℃的条件下，用Cu^2＋，Zn^2＋，Cd^2＋和Cr^6＋四种重金属对刺参幼参进行了单一急性毒性试验。结果表明：Cu^2＋对刺参幼参的24h，48h，72h和96hLC50分别为0．299，0．176，0．133和0．120mg，L；Zn^2＋的24h，48h，72h和96hLC50分别为6．700，3．624，2．577和1．951mg／L；Cd^2＋的24h，48h和72hLC50分别为4．246，2．588和2．137mgEL；Cr6＊的24h，48h和72hLC50分别为31．974，7,499和3．808mg，L；Cu^2＋,Zn^2＋，Cd^2＋和Cr^6＋对刺参幼参的安全浓度分别为0．018，0．362，0．259和0．750mg/L。四种重金属对刺参幼参的毒性大小依次为Cu^2＋〉Cd^2＋〉Zn^2＋〉Cr^6＋。

The acute toxicity of Cu^2＋, Zn^2＋, Cd^2＋ and Cr^6＋ acting on sea cucumber （Apostichopusjaponicus） was determined in stilled water at the water temperature of 18.5℃ - 20℃. The result indicated that the LC50 of 24 h, 48 h, 72 h and Cu^2＋ of 96 h to Apostichopusjaponicus juvenile were 0.299, 0.176, 0.133 and 0.120 mg/L respectively. The LC50 of 24 h, 48 h, 72 h and Zn^2＋ of 96 h were 6.700, 3.624, 2.577 and 1.951 mg/L respectively. The LCsoof 24 h, 48 h and Cd^2＋of 72 h were 4.246, 2.588 and 2.137 mg/L respectively. The LC50 of 24 h, 48 h and Cr^6＋ of 72 h were 31.974, 7.499 and 3.808 mg/L respectively. The safe concentrations of Cu^2＋, Zn^2＋, Cd^2＋ and Cr^6＋ to Apostichopus japonicus juvenile were 0.018, 0.362, 0.259 and 0.750 mg/L respectively. The toxicity sequence of the four heavy metals to Apostichopus japonicus juveniles in a descent order ranged as Cu^2＋ 〉 Cd^2＋ 〉 Zn^2＋ 〉 Cr^6＋.