Soil Sampling Coring equipment to sample soil on

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Soil Sampling • Coring equipment to sample soil on volatiles Traditional method: – Closed

Soil Sampling • Coring equipment to sample soil on volatiles Traditional method: – Closed stainless steel tubes with filler blocks that avoid head space and evaporation for soil with volatiles located deeper than 0. 5 m – Additionally sample tube is wrapped in aluminium foil and cooled – Preferably horizontal transportation, to avoid higher concentrations at one side of the tube Van Walt Ltd - Monitoring Your Needs 1

Soil Sampling • Methanol or sodiumthiosulphate method – Details can be found in USEPA

Soil Sampling • Methanol or sodiumthiosulphate method – Details can be found in USEPA 5035 A-2002 (both methods) or applicable ISO standards as ISO 22155 and ISO 18512 – Decontaminate the corer Van Walt Ltd - Monitoring Your Needs 2

Soil Sampling – Push or hammer the soil corer into the larger sample. –

Soil Sampling – Push or hammer the soil corer into the larger sample. – Overfill the corer – Push a second time if the soil is very sticky (like here in Haslemere) Van Walt Ltd - Monitoring Your Needs 3

Soil Sampling – Use plunger to push the 16 ml of soil in the

Soil Sampling – Use plunger to push the 16 ml of soil in the jar with 25 grams methanol or sodiumthiosulphate. • To allow the lab to express the concentrations found as based on dry weight a black capped coring should be sent with the methanol stored samples – Or wrap chemical analysis sticker around capped sample and store sample in a cool location or freeze. - Extraction is done in the laboratory Van Walt Ltd - Monitoring Your Needs 4

Soil Sampling – In the laboratory the methanol or sodiumthiosulphate will be analysed for

Soil Sampling – In the laboratory the methanol or sodiumthiosulphate will be analysed for volatiles. – A criticism: there are much better extraction liquids for volatiles. Use the “freeze method” – Be aware of safety risks: Methanol is highly flammable and toxic for humans. Chemicals in the field !? Van Walt Ltd - Monitoring Your Needs 5