Tong Lei, Qin Liting, Xie Cong, Liu Hui, Wang Yanxin, Guan Chuan, Huang Shuangbing
School of Environmental Studies, China University of Geosciences, Wuhan 430074, PR China.
School of Environmental Studies, China University of Geosciences, Wuhan 430074, PR China.
Chemosphere. 2017 Nov;186:100-107. doi: 10.1016/j.chemosphere.2017.07.141. Epub 2017 Jul 28.
Antibiotics are increasingly detected in groundwater, but little is known about their presence in deep underground sediments. In this study, underground sediment samples were collected from pig farms, chicken houses, fishponds and riverbanks in a small region of the Jianghan Plain. Sixteen antibiotics were detected in different layers of sediments in various animal-breeding areas, with the riverbank containing the most pollution, followed by the fishpond, then the pig farm and the least being the chicken house. Samples taken from different sections of the collection sites and tested for each antibiotic compound revealed significant pollution, with the riverbank containing the most pollution, followed by the fishpond, then the pig farm and the least being the chicken house. The concentrations of the targets did not decrease with depth, but increased between 0.6 m and 1.0 m, which was a significant fluctuation. The aquifer sediment analysis indicated that the greatest antibiotic retention was within 8 m, with a small increase between 12 and 16 m, consistent with the depth of sandy aquifer layers. None of the compounds were detected in the deep layer at 20 m but for sulfadiazine and chlorotetracycline. Tetracyclines and Fluoroquinolones were the two groups observed at higher concentrations in most sediment layers, although their residual levels no more than 20 ng g. This study revealed that antibiotics generally exist in the underground environment, along with groundwater migration and particle adsorption. The pollution of antibiotics in alluvial sediments is an immense challenge to groundwater remediation, and its environmental effects should be studied.
抗生素在地下水中的检出率越来越高，但人们对其在深层地下沉积物中的存在情况知之甚少。在本研究中，从江汉平原一个小区域的养猪场、养鸡场、鱼塘和河岸采集了地下沉积物样本。在各个动物养殖区域的不同沉积层中检测到了16种抗生素，其中河岸污染最严重，其次是鱼塘，然后是养猪场，污染最轻的是养鸡场。从采集地点的不同断面采集样本并对每种抗生素化合物进行检测，结果显示污染严重，河岸污染最严重，其次是鱼塘，然后是养猪场，污染最轻的是养鸡场。目标物的浓度并未随深度降低，而是在0.6米至1.0米之间增加，这是一个显著的波动。含水层沉积物分析表明，最大的抗生素截留量在8米以内，在12米至16米之间略有增加，这与砂质含水层的深度一致。在20米深处的深层中，除了磺胺嘧啶和金霉素外，未检测到其他化合物。四环素类和氟喹诺酮类是在大多数沉积层中浓度较高的两类，尽管它们的残留水平不超过20纳克/克。本研究表明，抗生素普遍存在于地下环境中，伴随地下水迁移和颗粒吸附。冲积沉积物中抗生素的污染对地下水修复是一个巨大挑战，应研究其环境影响。
