Table 3: Characteristics of the leaching tests considered in the standards.

Standard Particle Size L/S
(L/kg)		 Leachant pH of Leachant Leaching Type Duration Temperature
EN 12457-3 [18] < 4 mm 2 and 8 Demineralized water neutral Shaking 6 h + 18 h 20 ± 2 ºC
EN 12457-4 [12] < 10 mm 10 Demineralized water neutral Shaking 24 h 20 ± 2 ºC
NEN 7343 [19] < 4 mm 0.1, 0.2, 0.5, 1, 2 and 5 Demineralized water + nitric acid 4 ± 0.1 Percolation ± 3 weeks 20 ± 2 ºC
CEN/TS 14405 [20] 4 ≤ d ≤ 10 mm 0.1, 0.2, 0.5, 1, 2 and 5 Demineralized water Percolation ± 23 days 20 ± 5 ºC
EN 14997 [21] ≤ 1 mm 10 Demineralized water + nitric acid or sodium hydroxide 4 ≤ pH ≤ 12 pH equilibrium ≥ 48 h 20 ± 5 ºC
TCLP 1311 [22] < 9.5 mm 20 Demineralized water + acetic acid + sodium hydroxide 2.88* Shaking + pressure filtration 18 h ± 2 h 23 ± 2 ºC

* to substances with pH > 5