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环境中抗生素与重金属的共存会使各自在土壤中的迁移转化和生态效应变得更为复杂,为了准确评估磺胺二甲基嘧啶(SMT)与重金属镉复合污染下的环境风险,采用紫外光谱法,研究了中性条件下磺胺二甲基嘧啶与镉的络合特性;采用批量振荡吸附平衡法,研究了SMT存在的条件下针铁矿对镉的吸附特性.结果表明:SMT与镉有一定的络合能力,络合常数log K值为-3.31;针铁矿对SMT和镉都有一定的吸附作用;在SMT存在条件下,针铁矿对镉的吸附容量明显增强,这可能是由于SMT改变了针铁矿表面带电情况,红外结果表明在吸附过程中形成了针铁矿-SMT-镉三元络合物.因此,在评估抗生素与重金属复合污染的环境影响时,需要考虑到污染物之间的协同效应.
In the environment, the coexistence of antibiotics and heavy metals will make their migration and transformation in the soil and the ecological effects more complicated. In order to accurately assess the environmental risks of sulfadimethyl pyrimidine (SMT) and heavy metal cadmium combined pollution, the ultraviolet spectroscopy , The complexation of sulfamethazine with cadmium under neutral condition was studied.The adsorption of cadmium by goethite was investigated by batch oscillatory equilibrium method.The results showed that SMT and cadmium had a certain , And the log K value of the complexation constant is -3.31. Goethite has some adsorption effects on both SMT and cadmium. Under the condition of SMT, the adsorption capacity of goethite to cadmium significantly increased, which may be due to SMT changed the surface charge of goethite and the infrared results showed that goethite -SMT-cadmium ternary complex formed during the adsorption process.Therefore, in assessing the environmental impact of antibiotic and heavy metal compound pollution, it is necessary to consider the pollution Synergy between things.