砷对三角褐指藻、叉边金藻生长率的影响

THE EFFECT OF ARSENATE ON THE GROWTH RATE OF Phaeodelylum tricornation, Dicratoria

研究了砷（Ｖ）对近岸水中三角褐指藻和叉边金藻的毒性，其阈值分别为 １０－４．１ｍｏｌ／ｄｍ３和 １０－４．９ｍｏｌ／ｄｍ３。根据活性点模式计算砷（ Ｖ）与两藻的结合常数为 ６９２．５和９８９．７。砷（Ｖ）对叉边金藻的毒性作用不受磷酸盐浓度影响；砷（Ｖ）对三 角褐指藻的毒性作用随磷酸盐浓度降低而受到抑制。

In f/2 culture medium (except EDTA), the threshold values of arsenate toxity to Phaeodeclylum tricornution and Dicratoria were determined to be 10-4. 1 and 10-4. 9 mol/dm3. The apparent association constants of arsenate to the two algae are 692. 5 and 989. 7. The toxity of arsenate to Dicratoria isn't affected by the concentration of phosphate, but the toxity of arsenate to Phaeodeclylum Tricornution will be prevented when the concentration of phosphate decreases.