Calibration of organic-diffusive gradients in thin films (o-DGT) passive samplers for perfluorinated alkyl acids in water
Wang, P; Challis, JK; Luong, KH; Vera, TC; Wong, CS
| HERO ID | 7277660 |
|---|---|
| In Press | No |
| Year | 2021 |
| Title | Calibration of organic-diffusive gradients in thin films (o-DGT) passive samplers for perfluorinated alkyl acids in water |
| Authors | Wang, P; Challis, JK; Luong, KH; Vera, TC; Wong, CS |
| Journal | Chemosphere |
| Volume | 263 |
| Page Numbers | 128325 |
| Abstract | The application of the organic-diffusive gradients in thin films (o-DGT) passive sampling technique for the monitoring of per- and polyfluoroalkyl substances (PFAS) in the environment is still limited. Six common PFAS with different chain lengths were evaluated in water by o-DGT. Measured diffusion coefficients (D) in agarose and polyacrylamide diffusive gels ranged from 4.55-8.63 × 10-6 cm2 s-1 and 3.85-7.00 × 10-6 cm2 s-1 at 23 °C, respectively. Experimental sampling rates (Rs) for both agarose- and polyacrylamide-WAX sampler configurations were within 22% relative error of D-based Rs for four of the PFAS. Larger differences for perfluorobutanesulfonic acid (PFBS) and perfluoroundecanoic acid (PFUnDA) ranged from 36% to 56%. In general, in-situ Rs can be predicted using measured D-values for perfluorinated alkyl acids. The mass accumulation of six PFAS in two o-DGT configurations was linear over 21 days (R2 ≥ 0.97). Diffusion and uptake of o-DGT depended on the gel type and specific PFAS. Field demonstrations of o-DGT with WAX and HLB binding gels and polyacrylamide diffusive gels (not prone to biodegradation) found 0.3-19.5 ng L-1 of PFAS in rivers near industrial areas around Guangzhou and Foshan, China, with no apparent differences between the two co-deployed samplers. This study demonstrates that the configurations of o-DGT tested provide a cost-effective monitoring tool for measuring perfluorinated alkyl acids in aquatic systems, in particular the four PFAS for which reasonable correlations were observed. |
| Doi | 10.1016/j.chemosphere.2020.128325 |
| Pmid | 33297256 |
| Wosid | WOS:000595802200363 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Scopus URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091257501&doi=10.1016%2fj.chemosphere.2020.128325&partnerID=40&md5=e4f713dbb41a1978a3fea3076091f0d7 |
| Is Public | Yes |
| Language Text | English |
| Keyword | Organic-diffusive gradients in thin films; Perfluorinated alkyl acids; Diffusion coefficients; Passive sampling |