Maity Sulata, Bhattacharya Shelley, Chaudhury Shibani
Centre for Environmental Studies, Siksha-Bhavana, Visva-Bharati, Santiniketan 731235, India.
Chemosphere. 2009 Oct;77(3):319-24. doi: 10.1016/j.chemosphere.2009.07.011. Epub 2009 Aug 15.
Among pollutants, the coal fly ash occupies a significant position in industrial wastes. The fly ash matrix is a complex mixture of various organic (polyhalogenated compounds) and inorganic (Si, Al, Fe, As, Cd, Bi, Hg, etc.) chemicals. The application of fly ash for agricultural purposes and as landfills may lead to the contamination of the land with some of the toxic chemical compounds present in fly ash. Thus prior to the application of fly ash for developmental activities, it requires bio-monitoring and risk characterization. In order to achieve this objective adult Lampito mauritii were exposed to different proportions of fly ash in soil for 30 d and the concentrations of metallothionein in earthworm were assessed. The results revealed that up to 50% of fly ash amendment does not apparently harm the earthworm in respect of their survival and growth. A significant increase in tissue metallothionein level was recorded in L. mauritii exposed to fly ash amended soil without tissue metal accumulation indicating that metallothionein is involved in scavenging of free radicals and reactive oxygen species metabolites. It is concluded that this biochemical response observed in L. mauritii exposed to fly ash amended soil could be used in ecotoxicological field monitoring.
在污染物中，煤粉煤灰在工业废弃物中占据重要地位。粉煤灰基质是各种有机（多卤代化合物）和无机（硅、铝、铁、砷、镉、铋、汞等）化学物质的复杂混合物。将粉煤灰用于农业目的和作为填埋物可能会导致土地被粉煤灰中存在的一些有毒化合物污染。因此，在将粉煤灰用于开发活动之前，需要进行生物监测和风险表征。为了实现这一目标，将成年的毛里求斯腔蚓暴露于土壤中不同比例的粉煤灰中30天，并评估蚯蚓体内金属硫蛋白的浓度。结果表明，高达50%的粉煤灰添加量在蚯蚓的存活和生长方面显然不会对其造成伤害。在暴露于添加粉煤灰土壤的毛里求斯腔蚓中，组织金属硫蛋白水平显著升高，但没有组织金属积累，这表明金属硫蛋白参与清除自由基和活性氧代谢产物。得出的结论是，在暴露于添加粉煤灰土壤的毛里求斯腔蚓中观察到的这种生化反应可用于生态毒理学现场监测。
