Synchronous measuring sediment pore-water inorganic and organic matter concentration passive sampler
A passive sampler, passive sampling technology, used in instruments, measuring devices, scientific instruments, etc.
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[0021] 1. Before sampling, pre-treat the passive sampling vials. Such as figure 1 As shown, add ultrapure water (TOC<1ppb) to the nutrient sampling vial 3 in the pore water to be measured; add ultrapure water and nitric acid (excellent grade) to the sampling vial of heavy metals in the pore water to be measured, and make the concentration of nitric acid The volume fraction is 3%; a sheet of low-density polyethylene (LDPE) film that has an adsorption effect on hydrophobic organic pollutants such as polycyclic aromatic hydrocarbons PAHs and organochlorine pesticides OCPs is cut into strips and placed in dichloromethane, methanol and Soak in pure water for 48h, 24h and 24h to remove impurities. Then place the strip-shaped LDPE film 4 in the passive sampling vial 3 and fill it up with ultrapure water. After each sampling vial is preloaded, the 0.45 μm microporous filter membrane 2 is sequentially covered, and the bottle cap 1 containing the mesopore is tightly closed.
[0022] ...
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