Van Buren Jean, Cuthbertson Amy A, Ocasio Daniel, Sedlak David L
Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
Department of Civil and Environmental Engineering, University of California at Berkeley, Berkeley, CA 94720, USA.
Environ Sci Technol Lett. 2021 Jul 13;8(7):574-580. doi: 10.1021/acs.estlett.1c00316. Epub 2021 Jun 4.
Oxidation of organic contaminants by sulfate radical (SO ) is becoming more popular for the treatment of hazardous waste sites by chemical oxidation (ISCO) and industrial wastewater by advanced oxidation processes (AOPs). It is well documented that SO can produce similar oxygen-containing transformation products as hydroxyl radical-based treatment processes, but SO also has the potential to produce organosulfates by radical addition. Experiments conducted with a suite of 23 aromatic and 5 aliphatic compounds, including several contaminants typically detected at hazardous waste sites, demonstrated the formation of at least one stable sulfate-containing product for 25 of the compounds. These compounds likely exhibit higher mobility in the subsurface due to a lower affinity for surfaces (e.g., aquifer solids, activated carbon) than most other transformation products. Although the health risks associated with organosulfates are still uncertain, some aromatic organosulfates produced in this study (i.e. phenyl sulfate and p-cresyl sulfate) are known to be harmful uremic toxins. Further study of organosulfate formation, fate, and toxicity is needed before SO -based treatment processes are more widely employed.
通过硫酸根自由基（SO ）氧化有机污染物，在利用化学氧化法（ISCO）处理危险废物场地以及利用高级氧化工艺（AOPs）处理工业废水方面正变得越来越普遍。有充分文献记载，SO 能够产生与基于羟基自由基的处理工艺类似的含氧化转化产物，但SO 也有可能通过自由基加成生成有机硫酸盐。对包括几种在危险废物场地通常检测到的污染物在内的一组23种芳香族化合物和5种脂肪族化合物进行的实验表明，其中25种化合物形成了至少一种稳定的含硫酸盐产物。由于这些化合物对表面（如含水层固体、活性炭）的亲和力低于大多数其他转化产物，它们在地下可能具有更高的迁移率。尽管与有机硫酸盐相关的健康风险仍不确定，但本研究中产生的一些芳香族有机硫酸盐（即硫酸苯酯和对甲酚硫酸酯）已知是有害的尿毒症毒素。在基于SO 的处理工艺得到更广泛应用之前，需要对有机硫酸盐的形成、归宿和毒性进行进一步研究。
