Acute toxic effects of bromate on aquatic organisms

Acute toxic effects of potassium bromate, sodium bromate and potassium bromide on luminescent bacteria, water flea, green alga and zebrafish were studied using standard toxic testing methods. The results showed that the pollutants had no effect on the luminous intensity of luminescent bacteria. The 96 h EC₅₀ of potassium bromate on Scenedesmus obliquus was 738.18 mg·L^-1, 48 h EC₅₀on Daphnia magna and Moina was 154.01 mg·L^-1 was 161.80 mg·L^-1, while 48 h LC₅₀ was 198.52 mg·L^-1, 175.68 mg·L^-1, and 96 h LC₅₀ on zebrafish was 931.4 mg·L^-1. The 96 h EC₅₀ of sodium bromate on Scenedesmus obliquus was 540.26 mg·L^-1, 48 h EC₅₀on Daphnia magna and Moina was 127.90 mg·L^-1, 111.07 mg·L^-1, while 48 h LC₅₀ was 161.80 mg·L^-1, 123.47 mg·L^-1, and 96 h LC₅₀ on zebrafish was 1 065.6 mg·L^-1. But the effects of potassium bromide on the above several kinds of aquatic organisms were far smaller than those of potassium bromate and sodium bromate. The toxic effects on test organisms were due to the impacts of bromate after the comparison of different pollutants, and the effects were more obvious with the increase of exposure time. The order of sensitivity to the toxic effects of bromate was Daphnia magna, Moina>Scenedesmus obliquus>zebrafish>Chlorella vulgaris, luminescent bacteria.