重金属Pb与抗生素对发光菌的联合毒性研究

重金属是水环境中的典型无机污染物,随着水体中抗生素检出率的增加,重金属和抗生素的复合污染及其效应已成为环境领域的研究热点。通过研究重金属和抗生素对发光菌的发光抑制作用,可以了解重金属和抗生素的毒性效应,为评估重金属和抗生素复合污染在水环境中的潜在风险提供理论依据。本文利用便携式急性毒性检测仪,系统研究了重金属Pb和6种抗生素(四环素、氧四环素、氯四环素、磺胺二甲基嘧啶、磺胺甲基嘧啶和磺胺嘧啶)对费氏弧菌的单一和联合急性毒性,得到了单一污染物的半数效应浓度,并对重金属Pb和抗生素所组成的二元、三元复合污染体系的联合作用进行初步探讨。研究表明,当Pb与抗生素共存时,对发光菌的急性毒性急剧上升。因此,在评价Pb与抗生素二元或多元复合污染体系的生态风险时,应考虑其联合毒性作用。

Joint toxicity of heavy metal Pb and antibiotics to photobacterium

Heavy metals are typical inorganic pollutants in water environments. As the detection rate of antibiotics in water has increased, the compound pollution of heavy metals and antibiotics and their effects have become the focus of environmental research. By studying the luminescence inhibition effect of heavy metals and antibiotics on luminescent bacteria, the study tries to understand the toxic effects of heavy metals and antibiotics and provide a theoretical basis for assessing the potential risk of complex pollution of heavy metals and antibiotics in water environments. This article systematically studied the single and combined acute effects of heavy metal Pb and six antibiotics(tetracycline, oxytetracycline, chlorotetracycline, sulfamethazine, sulfamethine, and sulfadiazine) on Vibrio fischeri toxicity, obtaining the half effect concentration of a single pollutant. The combined effect of the binary and ternary compound pollution system composed of heavy metal Pb and antibiotics was discussed. Studies had shown that when Pb coexists with antibiotics, the acute toxicity to luminescent bacteria rised sharply. Therefore, when evaluating the ecological risk of Pb and antibiotic binary or multi-element compound pollution system, the combined toxic effects should be considered.