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实验研究了虾夷扇贝不同组织(鳃,内脏,外套膜和贝柱)在受到重金属Cd2+污染后的蓄积和排放规律。结果表明:(1)在染毒实验期间,海水中Cd2+不断被虾夷扇贝累积,且其内脏团、外套膜、鳃、贝柱中Cd2+的蓄积量均随暴露时间增加而增大。到第14 d均达到平衡。达到平衡后Cd2+蓄积量(干重)和蓄积速率均为:内脏团>鳃>外套膜>贝柱。其数值分别为:562.93×10-6和40.21×10-6/d,354.27×10-6和25.31×10-6/d,125.36×10-6和8.95×10-6/d,34.49×10-6和2.46×10-6/d。(2)排放实验期间,各组织中Cd2+蓄积量随排放时间的增加而逐渐下降。至排放第10天各组织中的Cd2+排出率为:贝柱﹥鳃﹥外套膜﹥内脏,各组织中Cd2+含量明显降低。表明:经短时间镉污染的虾夷扇贝,转入清洁海水一段时间对其体内Cd2+的排出是很有效的。(3)不同浓度Cd2+对虾夷扇贝各组织的影响实验表明:当Cd2+浓度相同时,扇贝不同组织蓄积量和富集系数次序均为:内脏团>鳃>外套膜>贝柱。虾夷扇贝各组织Cd2+蓄积量均随着暴露水体中Cd2+含量的增加而增加,海水中Cd2+浓度不影响Cd2+在虾夷扇贝各组织内的分配次序。而同一组织对Cd2+的富集系数与其蓄积量不同,它随着金属浓度的升高而呈现下降的趋势,贝柱的富集系数始终处在最低值。
The accumulation and emission of different tissues (gills, viscera, mantle and muscovado) of Cd-contaminated tissues were studied experimentally. The results showed that: (1) Cd2 + in seawater was continuously accumulated in the seawater during the exposure experiment, and the accumulation of Cd2 + in the visceral mass, mantle, gill and pombe increased with the increase of exposure time. By the 14th day, the balance was reached. After reaching the equilibrium Cd2 accumulation volume (dry weight) and the accumulation rate are: visceral mass> gill> mantle> Beizhu. The values were 562.93 × 10-6 and 40.21 × 10-6 / d, 354.27 × 10-6 and 25.31 × 10-6 / d, 125.36 × 10-6 and 8.95 × 10-6 / d, 34.49 × 10 -6 and 2.46 × 10 -6 / d. (2) During the experiment of discharge, the accumulation of Cd2 + in each tissue gradually decreased with the increase of the discharge time. The Cd2 + excretion rate in each tissue at the 10th day after discharge was as follows: Bells> gills> mantle> viscera, and the content of Cd2 + in each tissue was significantly decreased. The results showed that it is very effective to transfer cadmium into the seawater after a short period of cadmium pollution. (3) Effects of Cd2 + in different concentrations on the tissues of Echinochloa crusgalliThe experiments showed that when Cd2 + concentration was the same, the order of accumulation volume and enrichment coefficient of different tissues were as follows: visceral mass> gill> mantle> The accumulation of Cd2 + in tissues of Echinochloa crusgalli increased with the increase of Cd2 + content in exposed water, and the concentration of Cd2 + in seawater did not affect the distribution order of Cd2 + in tissues of Echinochloa crusgalli. The same organization of Cd2 + enrichment coefficient and its accumulation of different, with the increase of metal concentration showed a downward trend, Beilian enrichment coefficient is always at the lowest value.