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Line 49: ===Semipermeable membrane devices (SPMDs)=== {{Main\|Semipermeable membrane devices}} Semipermeable membrane devices (SPMDs) passively sample [[Chemical polarity\|nonpolar]] organic contaminants with a log octanol-water partition coefficient (K<sub>ow</sub>) value greater than 3. Examples of these types of chemicals include [[polycyclic aromatic hydrocarbons]] (PAHs), [[polychlorinated biphenyls]] (PCBs), [[polybrominated diphenyl ethers]] (PBDEs), chlorinated pesticides, [[~~dioxin~~Polychlorinated dibenzodioxins\|dioxins]]s, and [[~~furan~~Polychlorinated dibenzofurans\|furans]]s. SPMDs are composed of sealed plastic tubing filled with [[triolein]], in which nonpolar organics are very soluble and which serves as a representation of the fatty tissues of aquatic organisms. The tubing is then weaved between metal rods and enclosed in a metal cage. The sampler can be made in varying lengths of tubing for different applications, since sampling rate depends on the surface area of tubing exposed to the water. As long as the amount of water passing over the sampler is known, nonpolar organic contaminant water concentrations can be calculated after extracting contaminants from a SPMD.<ref name = POCISSPMD /> [[File:Stabilized liquid membrane device (SLMD).jpg\|thumb\|75px \|A 7.5 centimeter SLMD, filled with a 1:1 mixture of Kelex-100 and oleic acid.]]

Passive sampling: Difference between revisions