中性环境中铝盐絮凝剂对典型作物的生态毒性效应  

Ecological toxicity of aluminum-based coagulant on representative corps in neutral environment

作　　者：张凯松[1] 周启星[1] 

机构地区：[1]中国科学院沈阳应用生态研究所中国科学院陆地生态过程重点实验室

出　　处：《应用生态学报》2005年第11期2173-2177,共5页Chinese Journal of Applied Ecology

基　　金：国家杰出青年科学基金项目(20225722);国家重点基础研究发展规划资助项目(2004CB418503).

摘　　要：采用种子发芽和根伸长抑制的陆生生态毒理方法,在中性条件(pH=7.0)下对铝盐絮凝剂(Al-Cl3)的生态毒性效应进行了研究.结果表明,AlCl3溶液在pH=7.0时,与其酸性条件(pH=4.0)相比对萝卜、白菜和小麦等受试作物种子发芽和根伸长均表现出抑制作用,且发芽抑制率和根伸长抑制率与铝浓度均呈极显著相关(P<0.01).尽管在酸性条件下AlCl3对白菜和小麦根伸长抑制效应比相同浓度中性条件更为强烈,但对萝卜根伸长的抑制程度在相同铝浓度条件下则是pH=7.0时明显大于pH=4.0时,在低浓度时萝卜发芽抑制率也是中性条件明显高于酸性条件.同时,铝盐在中性条件下对萝卜、白菜的发芽和根伸长产生明显抑制效应的起始浓度低于酸性条件(<2.0 mg.L-1).By the terrestrial ecotoxicological methods of seed germination and root elongation, and with aluminum-based coagulant AlCl3 which was widely used in wastewater-and water treatment as an example, this work studied the toxicological effects of aluminum-based coagulants on representative crops, including radish Raphanus sativus, cabbage Brassica chinensis and wheat Triticum aestivum, over a range of exposure concentrations under the neutral condition （pH = 7.0 ）, with contrast to an acid condition （pH = 4.00）. The results indicated that there was a significantly positive correlation between the concentration of AlCl3 and the inhibitory rate of root elongation and seed germination either under pH 7.0 or 4.0 （P 〈 0.01）. Cabbage and wheat was more susceptive to AlCl3 toxicity under acid than under neutral condition, while radish was in adverse. The minimum inhibitory concentration of AlCl3 （ 〈 2.0 mg·L^-1 ） was lower under neutral than under acid condition.

关 键 词：铝盐絮凝剂 生态毒理 种子发芽 根伸长 抑制率 

分 类 号：X703.5[环境科学与工程—环境工程]