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目前铬污染已经成为世界性的环境问题.为探究生物硫铁复合材料(生物硫铁,BISC)在Cr~(6+)污染水体中对鱼类的保护作用,以斑马鱼为实验载体,在测定Cr~(6+)对斑马鱼的半数致死浓度(LC50)的基础上,研究生物硫铁对Cr~(6+)污染水体的处理效果,以及生物硫铁投加比(生物硫铁与Cr~(6+)的摩尔浓度之比)、投加时间和水体p H对Cr~(6+)污染水体中斑马鱼保护作用的影响.结果显示,在79.30 mg/L(24 h-LC50)Cr~(6+)污染水体(p H=6.98)中,生物硫铁的投加能够快速降低水体Cr~(6+)的浓度.当生物硫铁投加比达到3时能将Cr~(6+)快速去除,15 min后Cr~(6+)去除率达到84.01%,96 h后达到99.99%.斑马鱼存活率随生物硫铁投加比的增加和投加时间的减少而增大,最佳投加比为0.5;最佳投加时间为0-4 h,此时能将斑马鱼存活率提高90%以上,24 h时投加,作用96 h后亦可使斑马鱼存活率提高约3倍.在p H 6-9内,生物硫铁的投加可显著提高斑马鱼的存活率,且对斑马鱼的保护作用随p H降低而逐渐增强.本研究表明生物硫铁对Cr~(6+)污染水体中的斑马鱼保护效果显著,在Cr~(6+)突发污染治理方面具有广阔的应用前景.
At present, chromium pollution has become a worldwide environmental problem.In order to explore the protective effect of bioferric iron (BISC) on fish in Cr 6 (+) contaminated water, zebrafish On the basis of determining the LC50 of Cr 6+ to zebrafish, the treatment effect of biosulfur on Cr 6+ contaminated water was studied, Cr (6+) molar ratio), dosing time and water body p H on the protective effect of zebrafish in Cr 6+ contaminated water were studied.The results showed that at the concentration of 79.30 mg / L (24 h-LC50 ) Cr (6+) contaminated water (p H = 6.98), the addition of biosulfur can rapidly reduce the concentration of Cr 6+ in the water.When the biosulfur dosing ratio reaches 3, (6+), the removal rate of Cr ~ (6+) reached 84.01% after 15 min and reached 99.99% after 96 h.The survival rate of zebrafish increased with the increase of biodiesel addition rate and the decrease of dosing time Big, the best dosing ratio is 0.5; the best dosing time is 0-4 h, at this time the zebrafish survival rate can be increased more than 90%, dosing at 24 h, the zebrafish survival after 96 h Rate increased by about 3 times in the p H 6-9, bio-sulfur iron dosing can be significant The results showed that the bio-pyrites had a significant protective effect on zebrafish in Cr 6+ contaminated water, 6+) has a bright future in pollution control.