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===Peepers===
Peepers are passive [[diffusion]] samplers used for metals in freshwater and marine [[sediment]] pore water, so they can be used to find areas that may have metal-contaminated sediments. Peepers are plastic vessels filled with clean water and covered in a [[Dialysis (biochemistry)|dialysis membrane]], which allows metals in sediment pore water to enter the water inside the peeper.<ref name="Peeper1">{{cite journal |last1=Serbst |first1=JR |last2=Burgess |first2=RM |last3=Kuhn |first3=A |last4=Edwards |first4=PA |last5=Cantwell |first5=MG |title=Precision of Dialysis (Peeper) Sampling of Cadmium in Marine Sediment Interstitial Water |journal=Archives of Environmental Contamination and Toxicology |date=2003 |volume=45 |issue=3 |pages=297–305 |pmid=14674581 |doi=10.1007/s00244-003-0114-5}}</ref> They are usually placed deep enough into sediment to be in an [[Anoxic waters|anoxic]] environment, in which metals will be soluble enough to sample.<ref name = Missouri /> If the peepers are deployed long enough so the sediment pore water and contained peeper water reach equilibrium, they can accurately provide metal concentrations in sampled sediment pore water.<ref name = Peeper1 />
===Polar organic chemical integrative sampler (POCIS)===
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