Oil separators are used to separate free-phase oil from water contaminated with oil, and the function must be documented through sampling of the effluent twice a year (Forurensningsforskriften, Chapter 15).
ALS is now reducing the sample volume for oil in water analysis from the oil separator. New bottles are as follows:
| Analysis Package | Sample Bottle | Comment |
|---|---|---|
| Oil, TPH - C10-C40 (oil separator) in water | 100 ml glass bottle | Fill only half |
| Oil, TPH screening, > C5-C40 (oil separator) in water, [OV-20G HIGH] |
100 ml glass bottle 40 ml glass vial with NaHSO4 |
Fill only half Top-fill |
The change will have both quality and environmental benefits:
Quality: By using a new bottle that is filled only halfway, solvent can be added directly to the sample bottle, instead of taking a sub-sample.
Environmental: Smaller volume and weight are sent from the customer to ALS and further from ALS to the performing laboratory (ALS Czech Republic).
Oil in water analysis from the oil separator is performed according to ISO 9377-2, but the amount of solvent and the measurement range are adjusted to the sample matrix (water from the oil separator), where it is expected that the sample contains, among other things, oil and soap residues.
For more information about oil in water from the oil separator, see our sampling instructions