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The method is based on the principle that humus develops a dark color when it reacts with NaOH. The color intensity depends on the size of the humus occurrence. If the solution is clear or only slightly colored, the specimen does not contain an amount of humus that is considered significant. A strong color reaction usually reflects high humus content, but may be due to other factors. In that case, the method does not give a definitive conclusion.
Art.no.: 42-0455, Humus vessel
Accessories: V300-24, Sodium hydroxide, NaOH 500g | S132, Reference color (Standard color chart)
