Stable condition of dimethylmonothioarsinic acid (DMMTAV) and dimethyldithioarsinic acid ( DMDTAV) in landfill leachate

Abstract:

When waste containing arsenic (As) are disposed of landfill, such facilities (i.e., landfill) can play an important role in disseminating As to the surrounding environment. These disposal of waste containing As might cause a serious environmental pollution due to potentially As remobilization in landfill. Especially, As species containing sulfur such as DMDTA^v and DMMTA^v found occasionally high concentration in landfill leachate. These As species (i.e., DMDTA^v and DMMTA^v) had the higher toxicity to human cells compared to other pentavalent As species. However, there was no chemical standard material of these As species (i.e., DMDTA^v and DMMTA^v) commercially. In this study, we synthesized DMDTA^v and DMMTA^v by simulating reaction with the sufficient sulfur condition from DMA^v. DMMTA^v was quite changeable to DMDTA^v due to its short life time from our preliminary study. Thus, it is important to find the stable condition of synthesis process for DMDTA^v and DMMTA^v under suitable environmental condition. This study can be very significant in quantitative analysis area to detect the various As species in environmental media such as landfill.