Parameters | Materials and methods | References or standard |
Hydrogen potential | Ratio 1/5 (Compost/distilled water) JEULIN 701 296 pH meter INITIO. Accuracy: 10−2 | AFNOR NF ISO 10-390, 2005 |
Electrical conductivity (EC) | Ratio 1/5 (Compost/distilled water). CTA JEULIN 701 328 conductivity meter INITIO. Accuracy: 10−2 | AFNOR NF ISO 10-390, 2005 |
Total Organic Carbon (TOC) | Oxidation of organic matter (1 M potassium dichromate in acidic H2SO4 medium). -Reduction of the excess of potassium dichromate by an excess of double ferrous iron and ammonium sulphate solution at 0.5 N dosed in return with dichromate (1 M) | [11] |
Organic matter (OM) | Baking at 550˚C for 2 hours. Weight difference between the mass of dry waste and the mass of calcined waste | [10] |
Total nitrogen Kjeldahl, (TNK) | -Mineralization in an acidic medium and in the presence of a catalyst (K2SO4 and Se) -Distillation after neutralization of the excess acid with 30% sodium hydroxide solution -Titration of the distillate with a sodium hydroxide solution (0.1 M) in the presence of methyl red | AFNOR NF T 90-110 |
Phosphorus (P) | Extraction of compost with sulfuric acid at 15% by volume -Spectroscopic assay at 660 nm | [12] |
Potassium (P), calcium (Ca), magnesium (Mg), sodium (Na) | Mineralization of hot compost samples and aqua regia (HNO3 + HCl) -Determination by flame atomic absorption spectrophotometry | AFNOR NF ISO 11 460 of June 1995. |