牙鲆对海水中铅积累排放规律研究

Studies on lead accumulation and elimination in the tissues of Paralichthys olivaceus

研究了海水中铅在牙鲆内脏、肌肉、鳃组织中吸收、积累和排放规律及海水中总有机碳浓度对铅吸收的影响.结果表明,铅浓度为0 5mg/dm3时,各组织中铅蓄积量随暴露时间增加而增大,第9天均达到吸收平衡,此时铅蓄积量(mg/kg)内脏中的649 8大于鳃中的237 4大于肌肉中的59 71.染毒13d后将牙鲆移入清洁海水中排放的结果表明,随排放时间增加各组织中铅蓄积量明显下降,第10天时各组织中铅排出率为内脏团的84 85%大于鳃的61 26%大于肌肉的57 03%.海水中总有机碳浓度对铅蓄积量有明显影响,随着总有机碳浓度升高,各组织中铅蓄积量明显下降,表明海水总有机碳能降低铅的生物有效性.

Rule of lead accumulation and elimination in the tissues of viscus,muscle,gill of Paralichthys olivaceus and effects of TOC concentration in seawater on the accumulation of lead in the tissues were studied. It is demonstrated that when the lead concentration is 0.5 mg/dm^3, each tissue's lead accumulation increases with the elapse of time, on the ninth day the tissues' lead accumulations reach equilibrium. At that time, the accumulation order of lead in the fish tissues is viscus (649.8 mg/kg) greater than gill(237.36 mg/kg) greater than muscle(59.71 mg/kg). The lead concentration is maintained at 0.5mg/dm^3 for 13 d. During the depuration days all tissues' lead accumulations decrease with the elapse of time .On the 10th day the rate of elimination sequence of lead in the fish tissues is viscus (84.85%)greater than gill(61.26%) greater than muscle(57.03%). The TOC concentration in seawater has significant effect on lead accumulation. The lead accumulation decreases significantly with the increase of TOC concentration. It is demonstrated that TOC in seawater can decrease the bioavailability of lead.