水中五氯酚钠对发光细菌毒性测定的影响因素

应用发光细菌检测法,考察了不同的影响因素对水体中典型的有机污染物五氯酚钠的生物毒性测定结果的影响.结果表明,五氯酚钠对发光细菌的EC₅₀值随着pH值和硬度的增加而增加;五氯酚钠的15 min EC₅₀和20 min EC₅₀基本相符;与水体中相同浓度的常规有机污染物相比,五氯酚钠表现出更强的毒性,实验中常规有机污染物的存在对五氯酚钠毒性测定的结果影响较小.原水毒性检测实验显示一定毒性(相对发光率降低14%),原水水质对测定结果影响程度与去离子水相似.

Influential Factors on the Toxicity of Pentachlorophenol Sodium with MICROTOX System in Water

The biological toxicity of pentachlorophenol sodium (Na-PCP), a typical kind of aquatic organic pollutants, was tested with the MICROTOX system using luminescent bacteria with the influence of several factors taken into consideration. The EC₅₀ of Na-PCP increases with the increasing of the pH and hardness of the sample. The EC₅₀ (15min) of Na-PCP is approximately equal to its EC₅₀ (20min). Compared with some common organic pollutants, which exhibit little influence on the toxicity of Na-PCP when mixed, Na-PCP is more toxic. A reduction of 14% in relative luminescent rate was observed in the experiment with a natural sample. The natural sample exhibits similar influence on the toxicity of Na-PCP similarly compared with unionized water.