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

Abstract

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稬^-1) was lower under neutral than under acid condition.

Key words: Aluminum-based coagulation, Ecotoxicology, Seed germination, Root elongation, Inhibitory rate

CLC Number:

X131.5

ZHANG Kaisong, ZHOU Qixing. Ecological toxicity of aluminum-based coagulant on representative corps in neutral environment[J]. Chinese Journal of Applied Ecology, 2005, 16(11): 2173-2177.

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