BS ISO 21285:2019 pdf free.Soil quality – Inhibition of reproduction of the soil mite (Hypoaspis aculeifer) by soil contaminants. Approximately 0,3 % to 1,0 % calcium carbonate (CaCO3, pulverised, analytical grade) are necessary to get a pH of 6,0 ± 0,5. NOTE 1 Taking the properties of highly non-polar (log I(> 2) or ionizing substances into account, 5 % of peat have proven to be sufficient for maintaining the desired structure of the artificial soil. NOTE 2 It has been demonstrated that Hypoaspis aculeifer can comply with the validity criteria even on reproduction when tested In fIeld soils with lower organic carbon content (e.g. 2,7 %), and there is experience that this can be achieved In artificial soil with 5 % peat. Therefore, it is not necessary before using such a soil in a definitive test to demonstrate the suitability of the artificial soil for allowing the test to comply with the validity criteria unless the peat contents lowered more than specified above. Prepare the artificial soil at least three days prior to start the test, by mixing the dry constituents listed above thoroughly in a large-scale laboratory mixer. A portion of the deionized water required is added while mixing…