碱度的毒性强弱与池水的水温、pH值、盐度和鱼品种的不同而有较大的差异,其毒性往往随上述条件的变化而变化,这些情况在前面的报告中进行了讨论和验证。碱度致毒是个综合作用,在pH小于9时,与碱度同时起协同作用的因素有CO_2、总含盐量、CO_3~=(HCO_3~-),在pH值为9—9.5之间的主要是CO_3~=和HCO_3~-致毒,在pH大于9.5时,CO_3~=和OH~-起协同作用。另外随着碱度的增高,K~+、M~(++)离子含量相对增大,而C_a~(++)则逐渐减少,使水的毒性增强。 Alkalinity toxicity and water temperature and water temperature, pH value, salinity and fish species vary greatly, its toxicity often changes with the above conditions, these situations were discussed in the previous report and verification. Alkalinity toxin is a synergistic effect. When the pH is less than 9, the synergistic factors with alkalinity are CO_2, total salt content, CO_3 ~ (HCO_3 ~ -), pH value between 9-9.5 Mainly CO_3 ~ = and HCO_3 ~ - toxic, when the pH is greater than 9.5, CO_3 ~ = and OH ~ - synergistic effect. In addition, with the increase of alkalinity, the content of K ~ + and M ~ (++) ions increased relatively while that of C_a ~ (++) decreased gradually, which increased the toxicity of water.