title: Degradation of roxarsone in a silt loam soil and its toxicity assessment.
abstract: The land application of poultry or swine litter, containing large amounts of roxarsone, causes serious arsenic pollution in soil. Understanding biotransformation process of roxarsone and its potential risks favors proper disposal of roxarsone-contaminated animal litter, yet remains not achieved. We report an experimental study of biotransformation process of roxarsone in a silt loam soil under various soil moisture and temperature conditions, and the toxicity of roxarsone and its products from degradation. Results showed that soil moisture and higher temperature promoted roxarsone degradation, associating with emergent pentavalent arsenic. Analysis of fluorescein diacetate (FDA) hydrolysis activity revealed that roxarsone does not exert acute toxic on soil microbes. With the release of inorganic arsenic, FDA hydrolysis activity was inhibited gradually, as evidenced by ecotoxicological assessment using Photobacterium leiognathi. The results shade new lights on the dynamic roxarsone biotransformation processes in soil, which is important for guiding appropriate disposal of poultry or swine litter in the environment.
authors.affiliation: Department of Civil Engineering, Hefei University of Technology, Hefei 230009, China; School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Tengfang
authors.initials: T
authors.lastname: Liang
authors.affiliation: Department of Civil Engineering, Hefei University of Technology, Hefei 230009, China; School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Zhengchen
authors.initials: Z
authors.lastname: Ke
authors.affiliation: School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Chen
authors.affiliation: Department of Civil Engineering, Hefei University of Technology, Hefei 230009, China; School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Civil Engineering, Hefei University of Technology, Hefei 230009, China; School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China. Electronic address: gwchen@hfut.edu.cn.
authors.forename: Guowei
authors.initials: G
authors.lastname: Chen
mesh_terms: D000818:Animals; D001151:Arsenic / Q000032:analysis; D001711:Biotransformation; D003049:Coccidiostats / Q000378:metabolism / Q000633:toxicity; D054750:Ecotoxicology; D008372:Manure / Q000032:analysis; D011200:Poultry; D012406:Roxarsone / Q000378:metabolism* / Q000633:toxicity*; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism* / Q000633:toxicity*; D013552:Swine; D013696:Temperature
chemical_list: D003049:Coccidiostats; D008372:Manure; D012987:Soil; D012989:Soil Pollutants; D012406:Roxarsone; D001151:Arsenic
keywords: Biotransformation; Inorganic arsenic; Roxarsone; Silt loam soil; Toxicity assessment