Phototransformation of p-arsanilic acid in aqueous media containing nitrogen species.

Phototransformation of p-arsanilic acid in aqueous media containing nitrogen species.
Chemosphere. 2018 Dec;212:777-783
Authors: Xu J, Zhang H, Luo T, Liu Z, Xia J, Zhang X
Abstract
The effects of co-existing nitrogen species in surface water on the phototransformation of organoarsenical p-arsanilic acid (p-ASA) have been investigated using a xenon lamp as a simulated solar light source. Significant enhancements of p-ASA phototransformation efficiency were observed in the presence of nitrate and nitrite, increasing with the concentration of these species and pH, whereas ammonia showed no obvious effect. The products, including inorganic arsenic species and organic derivatives, have been analyzed in order to reveal the phototransformation pathways. In the nitrate and nitrite systems, only small proportions of inorganic arsenic species were generated, with the majority of p-ASA being converted into other organoarsenical derivatives through hydroxylation, nitration, and nitrosation. Phototransformation of p-ASA in collected natural surface water was also observed. This work has implications for the phototransformation of p-ASA in nitrogen-contaminated surface water.
PMID: 30179842 [PubMed - indexed for MEDLINE]

Source: Chemosphere - November 9, 2018 Category: Chemistry Authors: Xu J, Zhang H, Luo T, Liu Z, Xia J, Zhang X Tags: Chemosphere Source Type: research