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紫贻贝(Mytilus edulis)对4种重金属的生物富集动力学特性研究 总被引：21，自引：4，他引：21
应用半静态双箱模型室内模拟了紫贻贝对 4种重金属 (As、Hg、Cd、Pb)的生物富集实验 ,通过非线性拟合得到了紫贻贝富集重金属的吸收速率常数k1 、排出速率常数k2 、生物富集因子BCF、生物学半衰期B1 / 2 等动力学参数。实验海水盐度为 32、温度分别为( 1 2 .34± 2 .2 8)℃和 ( 6.63± 3.1 2 )℃、溶氧量 >6.5mg/L。得到的Hg、Cd、Pb的动力学参数k1为 8.71 2— 30 1 .5 ;k2 为 0 .0 0 942 5— 0 .0 30 64;BCF为 783.4— 1 1 75 4 ;B1 / 2 为 2 2 .62— 73.5 4。比较结果得出 :吸收速率常数k1 及生物富集因子BCF均随着外部水体浓度的增加而减小 ,在平衡状态下生物体内金属含量CAmax随着外部水体浓度的增加而增加 ,且基本呈正相关 ,说明紫贻贝是比较理想的重金属Hg、Cd、Pb污染的指示生物。紫贻贝排出Cd的生物学半衰期要长于金属Hg、Pb、As。 相似文献
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On the basis of the research of DO budget or kinetics in shrimp pond, the main influence process of DO and its seasonal variations are quantitatively described through redividing the budget process and modifying the quantitative method of the process. The percentages of oxygen demand of various processes in the total oxygen demand are different in shrimp cultivation seasons. It is showed that the dissolved oxygen demand of mini-organisms is the major affected factor of DO in this environment and approximately accounts for 64.1～74.1% of the total oxygen demand. In the early period of shrimp culture, the dissolved oxygen demand of allotrophic bacteria degrading organic matters is much lower than that of phytoplankton respiration. But in the midterrn and later period, it is about 50% of the total oxygen demand because of the higher water temperature and more serious self-pollution. The dissolved oxygen demand of sediment is lower and just 19.1～28.8%, while the percentage of shrimp oxygen demand is lower. The effect of phytoplankton on DO in shrimp culturing water has dualism. One is the oxygen producing process of photosynthesis and the other is the oxygen consumption process of respiration. It is estimated that the dissolved oxygen demand of phytoplankton respiration is approximately one-fifth of the oxygen produced by photosynthesis under normal illumination conditions. The dissolved oxygen demand of al lotrophic bacteria degrading organic matters and the total oxygen demand of sediment increase 4 times and 1.7 times respectively from the early period to the midterm and later period.Obviously, the DO of culturing water can be also greatly improved by controlling the selfpollution of organic matters during shrimp culture. 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＳｅｄｉｍｅｎｔｏｘｙｇｅｎｄｅｍａｎｄ(ＳＯＤ)ｉｎｃｌｕｄｅｓｂｉｏｌｏｇｉｃａｌａｎｄｃｈｅｍｉｃａｌｏｘｙｇｅｎｄｅｍａｎｄ(ＧｅｏｒｇｅａｎｄＪｏｓｅｐｈ,1980),ｉｓａｎｉｍｐｏｒｔａｎｔｆａｃｔｏｒａｆｆｅｃｔｉｎｇｄｉｓｓｏｌｖｅｄｏｘｙｇｅｎ(ＤＯ)ａｎｄｈａｓｂｅｃｏｍｅａｎｉｍｐｏｒｔａｎｔｐａｒａｍｅｔｅｒｉｎｍａｎｙｗａｔｅｒｑｕａｌｉｔｙｍｏｄｅｌｓｆｏｒｃｕｌｔｕｒｅｐｏｎｄｓ(Ｍａｄｅｎｊｉａｎ,1990;Ｆａｎｇ,1991).Ｓｏｉｔｉｓｎｅｃｅｓｓａｒｙｔｏ… 相似文献
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