期刊
ANALYTICA CHIMICA ACTA
卷 1018, 期 -, 页码 45-53出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2018.02.074
关键词
Passive sampling; o-DGT; pH; Pharmaceuticals; Pesticides
资金
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chairs Program
Recent literature has demonstrated the utility of the organic-diffusive gradients in thin films (o-DGT) device as an effective passive sampler for polar organics in aquatic environments. Here, a new configuration comprising a polyacrylamide diffusive gel and Sepra (TM) ZT sorbent was developed and calibrated under multiple pH conditions. Linear uptake (r(2) > 0.9) was observed at pH approximate to 5 for a suite of 31 pharmaceuticals and pesticides over 25 days, suitable for typical passive sampler deployments. At pH approximate to 8.5, linear uptake (r(2) > 0.9) was observed for many of the same compounds. Comparisons of the uptake rates between the two pH experiments generally agreed (14% average relative error), with only 6 compounds exhibiting marked reduction with pH (e.g. sulfonamide antibiotics). These discrepancies may be explained by changes in analyte-sorbent interaction (H-bonding) due to speciation changes at varying pH. Samplers performed well in field evaluations conducted in an impacted river system, showing close agreement with the previously validated agarose/HLB o-DGT configuration deployed simultaneously. This work illustrates that polyacrylamide diffusive gels are a more robust and resistant outer-membrane material compared to agarose used in earlier o-DGT configurations. Sepra (TM) ZT binding gels served as an effective binding resin, offering a cost effective and commercially available sorbent. (c) 2018 Elsevier B.V. All rights reserved.
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