【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).更多还原

【Abstract】 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.更多还原