季铵盐类化合物对蔬菜种子发芽的生态毒性研究

Seed germination experiment of three vegetables (flowering cabbage,radish,cucumber ) was conducted to study the ecotoxicity of three kinds of quaternary ammonium compounds ( dodecyl trimethyl ammonium chloride, dodecyl trimethyl ammonium bromide, and trioctyl methyl ammonium chloride).The results showed that half inhibition concentration values (IC50) of quaternary ammonium compounds to the root elongation of seed germination of flowering Chinese cabbage, radish and cucumber were 19.22-25.40 mgoL-1, 20.49-46.72 mgoL-1, and 35.80-65.67mgoL-1,respectively. Dodecyl trimethyl ammonium chloride displayed significant dose-effect relationships (p<0.05) with root elongation and germination rate of the flowering cabbage seed germination, and root elongation and shoot elongation of the radish seed germination, as well as root elongation and germination rate of the cucumber seed germination. Dodecyl trimethyl ammonium bromide demonstrated significant dose-effect relationships (p<0.05) with shoot elongation, root elongation and germination rate of the flowering cabbage seed germination, and root elongation and germination rate of the radish seed germination, as well as root elongation of the cucumber seed germinatio. Trioctyl methyl ammonium chloride revealed significant dose-effect relationships (p<0.05) with shoot elongation , root elongation and germination rate of the flowering cabbage seed germination, as well as the root elongation of radish and cucumber seed germination. Ecotoxicity of dodecyl trimethyl ammonium chloride and dodecyl trimethyl ammonium bromide was nearly the same and significantly greater than that of trioctyl methyl ammonium chloride. Their ecotoxicity response to seed germination of three vegetables decreased in the order of flowering cabbage > radish > cucumber.