摘要
通过苏州东郊城河试验:凤眼莲对城河污水及其重金属具有很强的吸收积累和净化能力。经凤眼莲净化后,其污水中酚浓度从0.005～0.023毫克/升降到检不出来,总氮从5.330自克/升降至2.330毫克/升,总磷从0.840毫克/升降至0.183毫克/升,COD从54.8毫克/升降至29.36毫克/升,水质透明度也有很大改善,从36.7厘米提高到90厘米左右。对重金属铜从0.57ppb降至0.32ppb,Pb 0.14ppb降至0.06ppb,锌65.6ppb降至23.6ppb,镉0.14ppb加降至0.03ppb等,从而使河水达到了渔业用水标准。根据实验结果,凤眼莲喂鱼后鱼类对重金属没有明显的二次富集现象,在鱼肉中重金属含量均在食品卫生标准(汞0.3毫克/公斤,铅2毫克/公斤、砷1毫克/公斤)以下.
The experiment conducted in the river of the east suburbs of Suzhourevealed that the water hyacinth had strong ability to accumulate heavy metals andpurity the waste-water. It could considerably reduce the concentration of the heavymetals in the water, reducing the Phenol from 0.005～0.023 mgL^(-3) to trace, TN from5.330 to 2.330 mgL^(-1), TP 0.840 to 0.183 mgL^(-1), COD 54.80 to 29.36 mgL^(-1); Cu 0.57to 0.32 ppb, Pb 0.14 to 0.06 ppb, Zn 65.6 to 23.6 ppb and Cd 0.14 to 0.03 ppb, ect.Meamwhile it improved water greatly, increasing the water transparency from 36.7 to90cm. Therefore, the river water after treated by water hyacinth could reach thestandard water quality suitable for fishes. According to the experimental results, thereis no distinct second accumlation of the heavy metals in the fish bodies after the fisheshave been fed on the water hyacinth. In the fish meat the contents of the heavy metalswere lower than the healthy food standard (Hg 0.3 mgKg^(-1), As 1 mgKg^(-1), Pb2 mgKg^(-1))
出处
《水产学报》
CAS
1988年第2期135-144,共10页
Journal of Fisheries of China
