BS EN ISO 15952 pdf download Soil quality — Effects of pollutants on juvenile land snails (Helicidae) — Determination of the effects on growth by soil contamination (ISO 15952:2006) 9.1.2 Preparation of the test mixtures 9.1.2.1 General The test mixture (3.3) is made up of test substrate and of test substance, preparation or matrix. Prepare enough test mixture in order...