Pollution characteristics and environmental risk assessment of typical veterinary antibiotics in livestock farms in Southeastern China

Abstract

Scientific interest in pollution from antibiotics in animal husbandry has increased during recent years. However, there have been few studies on the vertical exposure characteristics of typical veterinary antibiotics in different exposure matrices from different livestock farms. This study explores the distribution and migration of antibiotics from feed to manure, from manure to soil, and from soil to vegetables, by investigating the exposure level of typical antibiotics in feed, manure, soil, vegetables, water, fish, and pork in livestock farms. A screening environmental risk assessment was conducted to identify the hazardous potential of veterinary antibiotics from livestock farms in southeast China. The results show that adding antibiotics to drinking water as well as the excessive use of antibiotic feed additives may become the major source of antibiotics pollution in livestock farms. Physical and chemical properties significantly affect the distribution and migration of various antibiotics from manure to soil and from soil to plant. Simple migration models can predict the accumulation of antibiotics in soil and plants. The environmental risk assessment results show that more attention should be paid to the terrestrial eco-risk of sulfadiazine, sulfamethazine, sulfamethoxazole, tetracycline, oxytetracycline, chlorotetracycline, ciprofloxacin, and enrofloxacin, and to the aquatic eco-risk of chlorotetracycline, ciprofloxacin, and enrofloxacin. This is the first systematic analysis of the vertical pollution characteristics of typical veterinary antibiotics in livestock farms in southeast China. It also identifies the ecological and human health risk of veterinary antibiotics.

Keywords:

• Veterinary antibiotics
• pollution characteristics
• exposure
• distribution
• risk assessment

Acknowledgments

We acknowledge Daoji Cai, academician of the China Engineering Academy, for his strong support to this project.

Funding

The authors are very grateful for the financial support from the 2011 Commonwealth and Environmental Protection project granted by the MEP “The health risk assessment and management technology of veterinary medicine” (201109038) and “Study of determination method, pollution level, and pollution control strategy of antibiotic-resistant gene in China” (201309031), and from the Jiangsu Province Natural Science Foundation (BK20130644).