[
    {
        "id": "authors:x02yw-z3t46",
        "collection": "authors",
        "collection_id": "x02yw-z3t46",
        "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120816-130259865",
        "type": "conference_item",
        "title": "Sonochemical degradation of perfluorooctane sulfonate and perfluorooctanoate in groundwater",
        "author": [
            {
                "family_name": "Hoffmann",
                "given_name": "M. R.",
                "orcid": "0000-0001-6495-1946",
                "clpid": "Hoffmann-M-R"
            },
            {
                "family_name": "Cheng",
                "given_name": "J.",
                "clpid": "Cheng-Jie"
            }
        ],
        "abstract": "Ultrasonic irradn. has been shown to effectively degrade perfluorinated chems. (PFCs) such as perfluorooctane sulfonate\n(PFOS) and perfluorooctanoic acid (PFOA) in aq. soln. Reduced PFC sonochem. degrdn. rates in org.-rich groundwater\ntaken from beneath a landfill, however, testify to the neg. kinetic effects of the org. groundwater constituents. In this\nstudy, the PFOX (X = S or A) sonochem. degrdn. rates in a groundwater sample with org. concns. 10 times lower than\nthose in the groundwater taken from beneath a landfill are found to be 29.7% and 20.5% lower, resp., than the rates in\nMilliQ water, suggesting that inorg. groundwater constituents also neg. affect PFC sonochem. kinetics. To det. the\nsource of the groundwater matrix effects, we evaluate the effects of various inorg. species on PFOX sonochem. kinetics.\nAnions over the concn. range of 1 to 10 mM have dissimilar effects on the sonochem. degrdn. rates of PFOX that follow\nthe Hofmeister series. In contrast, the presence of 5 mM of various cations has negligible effects. Initial soln. pH\nenhances the degrdn. rates of PFOX at 3, but has negligible effects over the range of 4 to 11. The obsd. inorg. effects\non sonochem. kinetics are hypothesized to be due to ions' partitioning to and interaction with the bubble-water interface.\nFinally, it is shown that the rate redn. in the groundwater is primarily due to the presence of bicarbonate and thus can be\nfully rectified by pH adjustment prior to sonolysis.",
        "publisher": "Caltech Library",
        "publication_date": "2010-12"
    }
]