The number of worms per sample must provide a mass of worm tissue such that the mass of test substance per sample at the beginning of the uptake phase and at the end of the elimination phase, respectively, is significantly higher than the detection limit for the test substance in biological material.
La méthode de détermination du pH d'un échantillon de sol, décrite ci-dessous, s'appuie sur la norme ISO 10390 (Qualité du sol — Détermination du pH) (1).