- a) an intact core sealed to prevent loss of VOCs is taken and sent to the laboratory; and
- b) a small portion of material taken with a coring device is immediately placed in water or a preservative (e.g. methanol or sodium hydrogen sulfate) in a subsequently sealed vial to be sent to the laboratory.
NOTE 1 This standard uses the term "soil" to refer to "soil and soil materials" as defined BS EN ISO 11074:2015, 7.4.16, although the procedures specified might not be applicable to certain coarse soils and rocks (see 4.1.2, Figure 1 and 6.3).
NOTE 2 The methods described can be applied at the sampling location, in an on-site facility or at an off-site facility. In all three cases, the sample is then sent to the analytical laboratory. It is assumed that the overall site investigation is carried out in accordance with BS 10175 and that the sampling strategy is developed in accordance with BS 10175 and BS ISO 18400‑104.
NOTE 3 Analytical procedures are outside the scope of this standard. Laboratories should adopt procedures that will yield accurate results for the sample as presented to the laboratory. The sampling methods described are suitable for use in connection with, amongst others, the analytical methods described in:
- • BS EN ISO 15009, Gas chromatographic determination of the content of volatile aromatic hydrocarbons, naphthalene and volatile halogenated hydrocarbons – Purge-and-trap method with thermal desorption;
- • BS EN ISO 16558‑1, Risk–based petroleum hydrocarbons – Determination of aliphatic and aromatic fractions of volatile petroleum hydrocarbons using gas chromatography (static headspace method);
- • BS EN ISO 22155, Gas chromatographic determination of volatile aromatic and halogenated hydrocarbons and selected ethers – Static headspace method.
