title: Kinetics, intermediates and acute toxicity of arsanilic acid photolysis.
abstract: Arsanilic acid (4-amino phenyl arsenic acid, ASA) is widely used in poultry production as feed additives, while most of ASA in the feed is excreted in the animal manure and released into the environment. However, the environmental behaviors of ASA were not well understood. In the present study, the photolysis behaviors of ASA and the toxicity of its metabolites to luminescent bacterium were studied. The results showed that ASA could be photodegraded and this process was strongly affected by solution pH, humic acid and dissolved oxygen. Upon UV irradiation for 360 min, ASA could be completely eliminated, but the reduction of total organic carbon (TOC) was not significant. In addition, NH4(+) ions and inorganic arsenic including arsenite and arsenate were identified as the predominant end-products. The conversion of ASA included both direct and indirect photolysis involving radicals, and its possible photolysis pathways were proposed on the basis of the identified intermediates. Unfortunately, higher adverse effects of the conversion products of ASA on bacteria were observed during the photolysis reaction. The results of present study might be helpful for assessing the environmental persistence and risks of ASA.
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Xiang-Dong
authors.initials: XD
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Yu-Jun
authors.initials: YJ
authors.lastname: Wang
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Cun
authors.initials: C
authors.lastname: Liu
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Wen-Xiu
authors.initials: WX
authors.lastname: Qin
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: dmzhou@issas.ac.cn.
authors.forename: Dong-Mei
authors.initials: DM
authors.lastname: Zhou
mesh_terms: D048908:Aliivibrio fischeri / Q000187:drug effects; D000818:Animals; D001147:Arsanilic Acid / Q000737:chemistry* / Q000378:metabolism / Q000633:toxicity*; D001149:Arsenates / Q000378:metabolism; D004785:Environmental Pollutants / Q000737:chemistry* / Q000378:metabolism / Q000633:toxicity*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010100:Oxygen / Q000737:chemistry; D010782:Photolysis
chemical_list: D001149:Arsenates; D004785:Environmental Pollutants; C025657:arsenic acid; D010100:Oxygen; D001147:Arsanilic Acid
keywords: Arsanilic acid; Mechanism; Photolysis; Toxicity