کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5130898 | 1490866 | 2017 | 10 صفحه PDF | دانلود رایگان |
- DGT is optimized for anionic pesticides from different chemical groups.
- Polyacrylamide is more suitable than Agarose for diffusive gel.
- HLB-DGT is more suitable than MAX-DGT.
- Successful quantifications are demonstrated in laboratory.
- Successful in situ applications are demonstrated in two Rivers.
DGT passive samplers using Oasis® HLB or Oasis® MAX sorbent were developed for anionic pesticides sampling. They were tested using four model compounds (i.e. bentazon, chlorsulfuron, ioxynil and mecoprop). Polyacrylamide diffusive gel was found to be more suitable than agarose gel for most anionic pesticides sampling. An elution procedure was optimized and diffusion coefficients were determined for quantitative use of the samplers. Depending on the DGT configuration used (HLB or MAX), accuracies better than 30% were demonstrated in laboratory for pH from 3 to 8 and ionic strengths from 10â2 to 1 M. Combined with the effective binding capacities of samplers (â¥9 μg for each pesticide) and limits of quantification of the method (â¤13 ng.Lâ1 using Q-TOF detector) monitoring of numerous aquatic systems can be expected. Except for ioxynil, accurate quantifications were demonstrated in laboratory using a spiked natural water for HLB-DGT whereas MAX-DGT did not give satisfactory results. A further in situ validation was performed in two rivers and showed identical detection frequency between HLB-DGT and POCIS of anionic pesticides (bentazon and mesotrione) whereas calculated concentrations, although within the same order of magnitude, could differ (<70%). HLB-DGT could therefore constitute an interesting alternative to other passive samplers for the monitoring of several anionic pesticides in aquatic systems but more work is required for quantification of molecules from hydroxybenzonitrile chemical group (ioxynil).
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Journal: Analytica Chimica Acta - Volume 966, 8 May 2017, Pages 1-10