CAJ | 학술논문

采用批平衡实验方法,研究了四环素(TC)在褐土和红壤中的吸附和解吸,以及Cd~(2+)对四环素在两种土壤上吸附和解吸的影响.结果表明,四环素在褐土和红壤中的吸附可以用Freundlich等温吸附方程拟合,所得lgK_f分别为3.039和3.169,这表明四环素在红壤中的吸附能力较强.此外,四环素在两种土壤上的解吸过程都存在滞后现象,所得lgK_(f,des)分别为3.292和3.877,这将可能威胁到土壤环境和人体健康.常见重金属Cd~(2+)的存在会促进四环素在两种土壤上的吸附,在红壤中表现显著(P<0.05);同时红壤中四环素的lgK_(f,des)有所增加,而在褐土中的变化不大.
채용비평형실험방법,연구료사배소(TC)재갈토화홍양중적흡부화해흡,이급Cd~(2+)대사배소재량충토양상흡부화해흡적영향.결과표명,사배소재갈토화홍양중적흡부가이용Freundlich등온흡부방정의합,소득lgK_f분별위3.039화3.169,저표명사배소재홍양중적흡부능력교강.차외,사배소재량충토양상적해흡과정도존재체후현상,소득lgK_(f,des)분별위3.292화3.877,저장가능위협도토양배경화인체건강.상견중금속Cd~(2+)적존재회촉진사배소재량충토양상적흡부,재홍양중표현현저(P<0.05);동시홍양중사배소적lgK_(f,des)유소증가,이재갈토중적변화불대.
Tetracycline(TC) has been extensively used in human infection medicines and veterinary medicines, especially in China. Heavy metals and antibiotics often coexist in soil due to land application of anmial wastes and other sources of inputs. On the basis of the OECD Guideline 106, batch sorption methods were employed to reveal the effect of Cd~(2+) on TC sorption and desorption process in two tested soils (cinnamon soil and red soil). Results showed that the Freundlich model was the best isotherm to describe the experimental datas of adsorption and desorption. The lgK_f on cinnamon soil and red soil were 3.039 and 3.169, respectively, which showed that red soil had more stronger sorption capacity for TC than cinnamon soil. Heavy metals Cd~(2+) could promote TC sorption on two tested soils, especially in red soil(P<0.05). The appararent sorption-desorption hysteresis were found in two soils, and the lgK_(f,des) on two soils were 3.292 and 3.877 respectively. The lgK_(f,des) in red soil increased with the addition of Cd~(2+) but little change in cinnamon soil. It is important to consider the interaction of Cd~(2+) and TC when modeling the fate of Cd~(2+) and TC in soil.