论文部分内容阅读
浮游植物指悬浮在水体中的植物(主要是藻类),是水生生物链的基础之一,在水生生态系统中占有重要地位.浮游植物的某些属种在污水处理、水体自净中起积极作用,可作水体富营养化指示生物.浮游植物施放到水中的毒素称为浮游植物毒素.水体中有机物和无机盐过量(磷的浓度为0.02mg/l、氮的浓度为0.3mg/l)时会明显促进和加速浮游植物的繁殖生长.它一方面消耗水中大量溶解氧,使生物呼吸困难,造成鱼类和其它水生生物因缺氧而死亡、水质变得黑臭;另一方面浮游植物毒素积蓄到临界浓度,对人体产生危害.浮游植物毒素可经多种途径进入人体,有些可不加改变地通过普通水处理构筑物进入饮用水中.这些毒素可在水生动物(鱼、贝类)体内富集,经常饮用含浮游植物水的牲畜体内也可富集毒素,人通过吃这样的水产品和畜肉而摄入浓缩的浮游植物毒素.人摄进这种毒素达到极量时可出现胃肠道炎症、痢疾、麻痹甚至死亡,有人设想许多非细菌性消化道疾病是由于摄入浮游植物
Phytoplankton refers to the plants (mainly algae) that are suspended in water and form one of the foundations of the aquatic organism chain and play an important role in aquatic ecosystems. Some species of phytoplankton play a positive role in wastewater treatment and water purification , Which can be used as water eutrophication indicator organisms.Phytoplankton released into the water toxins called phytoplankton toxins.When the organic matter and inorganic salts in excess water (phosphorus concentration of 0.02mg / l, nitrogen concentration of 0.3mg / l) Will significantly promote and accelerate the reproductive growth of phytoplankton .On the one hand it consumes a large amount of dissolved oxygen in water, so that biological breathing difficulties, resulting in fish and other aquatic organisms died of hypoxia, the water becomes black and smelly; the other hand, phytoplankton toxins Accumulation to the critical concentration, harmful to humans.Phytogenetic phytoplankton can enter the body through a variety of ways, some without change through ordinary water treatment structures into drinking water.These toxins in aquatic animals (fish, shellfish) body rich Set, often drinking animals containing phytoplankton water can also be rich in toxins, people eat such aquatic products and meat intake of concentrated phytoplankton toxins. There may be inflammation of the gastrointestinal tract, diarrhea, paralysis and even death, it was conceived many non-bacterial gastrointestinal disease reaches the maximum dose due to ingestion of phytoplankton