Implication of transformation reactions of arsenic species in high sulfur environment

Toxicity of Arsenic Species found in environment depends on their conditions where reactions can takes place. Chemicals such as sulfur may play a key role on the transformation of Dimethylmonothioarsinic acid (DMMTA^V) from non toxic organic arsenic species such as dimethylarsinic acid (DMA^V). DMMTA^V a highly toxic arsenic species, which was observed in municipal landfill leachate, has been received attention by many environmental chemists due to its high toxicity to human. High concentration of sulfur environment was expected for responsible DMMTA^V a methyl-thiolated arsenic species formation by transformation reactions through various geochemical processes. The reaction pathways where the hydrosulfide concentration is sufficient, the transformation reaction of methyl-thiolated arsenic species like DMMTA^V can take place. To study this reaction pathways in nature sulfur condition as concentration has been modified in the presence of dimethylarsinic acid (DMA^V). Various sulfide sources were tested as sulfide source in the presence of dimethylarsinic acid (DMA^V). The sodium sulfide was added in the DMA^V solutions, the concentration of DMMTA^V increased concurrently with a positive correlation. This research was supported by the National Research Foundation of Korea (grant number NRF-2019R1A2C2007092) and Korea Basic Science Institute (grant number C39707).