tailieunhanh - Passive Sampling Techniques Episode 7

Tham khảo tài liệu 'passive sampling techniques episode 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | DA Alvarez et al. with a CV of 32 indicating strong WBL control. Furthermore differences in the polarity of organic analytes accumulated in SPMDs and POCIS have no relevance to equations used for the diffusion of aqueous solutes through the WBLs of PoCIS and SPMDs. To date small SPMDs containing PRCs have been used by either placing the SPMD inside the POCIS deployment canister or by attaching a small SPMD holder to the outside of the POCIS canister. However by fixing PRC-spiked SPMDs between POCIS compression rings and mounting the resulting disk similarly to POCIS disks in deployment canisters the turbulence regime experienced by the SPMD disk should be about the same as adjacent POCIS disks. With the exception of the differences in biofouling between the POCIS and SPMD membranes environmentally induced changes in the rates of PRC loss from SPMDs should reflect the changes in POCIS sampling rates. PRC-SPMD fixed to the outside of POCIS canisters provides only a means of adjusting relative differences in flow and temperature among sites. Although attempts to use the classical PRC approach . spiking of PRCs into sorptive matrix of the sampler for current POCIS configurations have been unsuccessful so far . Alvarez unpublished data research will continue in this area. Initial experiments have revealed that a silicone membrane disk may be a suitable alternative as a sorbent material for POCIS PRC determinations. Seven-day trials in microcosms containing 1L of stirred water indicated that silicone disks fortified with 14C diazinon lost up to 50 of the chemical to the surrounding water. Concurrent trials with the two sorbents commonly used in the POCIS showed less than 1 loss of 14C diazinon to the water. Evaluation of the PRC-loaded silicone disks contained within the PES membranes is on-going. Determination of sampling rate and kinetic data for chemicals of interest As previously mentioned the estimation of ambient water concentrations is dependent on the

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