The standard applies to water that is only slightly contaminated. The described method determines animal, vegetable and mineral oils and fats, as well as fatty acids, soaps, waxes and some dyes. Notes 1. During the drying process, volatile products can escape and the extract can absorb oxygen. 2. For the determination of components extractable with petroleum ether in highly contaminated water, see NEN 3235 9.2.1.
NEN 3235 9.2.2-1978 history
1978NEN 3235 9.2.2-1978 Test methods for waste water. Gravimetric determination of oil and fat content. Direct extraction