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) 4Principle Juvenile land snails (usually Helix aspersa aspersa Miller) are exposed during a period of 28 days to a testmixture containing the test substance, preparation or matrix at different concentrations. The...