PS Polar
PS Polar is our sampling system for polar organic compounds in water . Many hydrophilic pesticides and drug substances , among others , belong to this category . The sampler consists of a solid sorbent ( a powder ) enclosed between two membrane layers that are mounted between a pair of stainless steel washers . Up to three PS Polar samplers can be mounted in one steel canister ( the same type of canister as for PS Organic ), that can be hired or purchased from ALS . Polar compounds diffuse through the membranes and are accumulated by the sorbent . Following extraction , the analysis is carried out by standard methods , and the concentrations in the sampled water can be calculated .
Analyses for PS Polar
Polar pesticides
Analytical package
LOQs depend on sampling times . Please contact your local sales representative for further details or for information on analyses of pharmaceutical substances .
PS VOC
PS VOC , our method for passive sampling of volatile organic compounds , consists of LDPE tube ( approximately 35 cm long ) with a polyethylene protective mesh on the outside . The tube is filled with deionized water through a fill nozzle and closed with a plug .
The appropriate deployment time is dependent on the time required by the sampler to equilibrate with ambient water and the time required for environmental disturbances caused by sampler deployment to return to ambient conditions . The rate at which deionized water in the sampler equilibrates with the ambient water depends on e . g . the type of compound and the water temperature . A minimum equilibrium time of two weeks is suggested for most field applications . When the sampler is retrieved , a discharge tube is pressed into the membrane and two vials are filled . The samples are then analyzed using standard methods ( see page 13 ).
IF YOU CONSIDER PASSIVE SAMPLING AS AN INTERESTING TOOL , DO NOT HESITATE TO CONTACT US FOR FURTHER INFORMATION .
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