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=== Microporous polyethylene tubes (MPT) ===
Microporous polyethylene tubes (MPT) attempt to mitigate the flow-dependency of other kinetic passive samplers such as Chemcatcher and POCIS by introducing a thicker membrane.<ref>{{Cite journal|last1=Fauvelle|first1=Vincent|last2=Kaserzon|first2=Sarit L.|last3=Montero|first3=Natalia|last4=Lissalde|first4=Sophie|last5=Allan|first5=Ian J.|last6=Mills|first6=Graham|last7=Mazzella|first7=Nicolas|last8=Mueller|first8=Jochen F.|last9=Booij|first9=Kees|date=2017-03-07|title=Dealing with Flow Effects on the Uptake of Polar Compounds by Passive Samplers|journal=Environmental Science & Technology|volume=51|issue=5|pages=2536–2537|doi=10.1021/acs.est.7b00558|pmid=28225255|bibcode=2017EnST...51.2536F|s2cid=206567423 |issn=0013-936X|doi-access=free}}</ref> The diffusive polyethylene layer prevents the thickness of the water-boundary layer (which is affected by flow) from dominating diffusion.<ref name=":0">{{Cite journal|last1=Fauvelle|first1=Vincent|last2=Montero|first2=Natalia|last3=Mueller|first3=Jochen F.|last4=Banks|first4=Andrew|last5=Mazzella|first5=Nicolas|last6=Kaserzon|first6=Sarit L.|date=2017|title=Glyphosate and AMPA passive sampling in freshwater using a microporous polyethylene diffusion sampler|url=https://pubmed.ncbi.nlm.nih.gov/28886558/|journal=Chemosphere|volume=188|pages=241–248|doi=10.1016/j.chemosphere.2017.08.013|issn=1879-1298|pmid=28886558|bibcode=2017Chmsp.188..241F}}</ref> The tube is filled with sorbents depending on the chemicals or chemical groups being sampled and has been successfully used to sample glyphosate, AMPA, illicit drugs and pharmaceuticals and personal care products.<ref name=":0" /><ref>{{Cite journal|date=2020-02-20|title=Calibration and validation of a microporous polyethylene passive sampler for quantitative estimation of illicit drug and pharmaceutical and personal care product (PPCP) concentrations in wastewater influent|url=https://www.sciencedirect.com/science/article/abs/pii/S0048969719358863|journal=Science of the Total Environment|language=en|volume=704|pages=135891|doi=10.1016/j.scitotenv.2019.135891|issn=0048-9697|last1=McKay|first1=Sarah|last2=Tscharke|first2=Ben|last3=Hawker|first3=Darryl|last4=Thompson|first4=Kristie|last5=O'Brien|first5=Jake|last6=Mueller|first6=Jochen F.|last7=Kaserzon|first7=Sarit|pmid=31838300|bibcode=2020ScTEn.70435891M|s2cid=209386153 |url-access=subscription}}</ref>
===Peepers===
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