Samplers groundwater sampling

Sladky, B., and Roberts, P. G. (2002). Zero-purge groundwater sampling for semivolatile organic compounds. ITRC—Diffusion Sampler Database. Available from http //www.diffusionsampler. org/... 

Trick J. K., Stuart M., and Reeder S. describe the tools available to the field sampler for the collection of groundwater samples, methods of on-site water quality analysis, and the appropriate preservation and handling ofsamples. The authors discuss the merits of different purge methodologies and show how on-site measurements such as pH, specific electrical conductance (SEC), oxidation—reduction potential (ORP), dissolved oxygen (DO), temperature, and alkalinity can be used to provide a check on subsequent laboratory analyses. Techniques for the preservation and analysis of samples and quality assurance and quality control are also presented. 

Table IIU Aldlcarb Residue Concentrations (ppb) In Groundwater Samples Withdrawn through Multilevel Samplers Depth below Date (year, month) ...

Groundwater refuses to submit to a regimented written procedure, and the sampling of it may be more of an art than science. The ability to bring groundwater to the surface and collect a representative sample depends on the experience, intuition, and individual sampling technique of the sampler. 

Passive samplers are widely used in monitoring volatile organic chemicals (VOCs) in groundwater. Such samplers have the potential to reduce costs of monitoring from the high levels associated with the use of pumps to sample the test wells. Moreover, the risk of loss of volatile analytes during sample transport and storage is substantially reduced once the compounds are accumulated in the sampler sorption phase. 

Vroblesky, D.A. 2007. Passive diffusion samplers to monitor volatile organic compounds in groundwater. In R. Greenwood, G.A. Mills, and B. Vrana (eds), Passive Sampling Techniques in Environmental Monitoring, pp. 295-309. Amsterdam Elsevier. 

A similar survey was carried out in The Netherlands in 2001. Morgenstern et al. [52] developed an off-hne P T coupled to a GC/MS equipped with an automated thermal desorption sampler (ATD), which enabled the analysis of at least 40 samples per day and a MTBE quantification limit of 0.02 irgL MTBE concentrations ranged < 0.01-0.42 xgL in Dutch drinking water sources with a median below 0.01 xgL. The highest value 2.9 xgL was associated with a point source contamination of groundwater. 

Semipermeable membrane devices (SPMDs) filled with triolein, identical to the ones used in air sampling, are also commonly employed in water monitoring. Gustavson and Harkin [191] reported a comparison between SPMDs and typical active samplers (bailers and automated systems) for the monitoring of PAHs in groundwater. Among other important... 

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