Chromatographic analysis of the environment by Robert L Grob; Leo M L Nollet
By Robert L Grob; Leo M L Nollet
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Extra info for Chromatographic analysis of the environment
Sample containers should remain in such containment up to the point where the sample is to be placed into it. It may be necessary to “double-protect” sample containers during transport to a ﬁeld sampling site by protecting the integrity of the sealing containment with a secondary containment such as a zip-lock bag to hold batches of sealed precleaned sample containers. I. SAMPLE P RESERVATION /STABILIZATION AND S TORAGE In addition to ensuring that sample containers have sufﬁcient capacity to store the minimum volume of sample needed for the range of tests to be applied, it is important to preserve the integrity of samples over the period between the taking of the samples and commencement of laboratory analysis.
SAMPLING A IR The atmosphere is an important media for the environmental distribution of chemicals. , it allows high sampling rates and good detection limits) this poses a range of challenges for the sampling strategy. Sampling air contaminants can be required for a wide variety of reasons covering a wide range of pollution levels including emission evaluation, for example, from industrial stacks, workplace health and safety exposure evaluation, and the evaluation of background concentrations of pollutants in ambient air.
2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Are the purpose and objectives of the sampling program clearly stated and understood? Are data requirements stated and speciﬁc variables of interest determined? Have appropriate measurement techniques been selected? If in situ measurements are to be made, are calibration procedures in place? Will the chosen sampling method and equipment collect a representative sample? Will disturbance of the environment during sampling impact on the integrity of the sample? Will the sample be altered physically or chemically by contact with sampling equipment?