Humic substances that form the basis of leonardite – a complex mixture of high-molecular natural organic compounds formed during the decomposition of dead plants and their subsequent so-called humification (biochemical transformation of decomposition products of organic residues into humus with the participation of microorganisms, water and oxygen). Humic substances are biologically active substances. They activate biochemical processes in the body of animals and in plant cells. This circumstance predetermines the high demand for humates in the domestic and international markets. Particularly valuable for plants are humic preparations enriched with potassium and phosphorus, i.e. The main elements that determine the fertility of soils.

Characteristics of brown coal (leonardite)

Index Value
Moisture (operating state), % 55,00
Ash,% (not more than) 12,00
Acidity, pH 6,40
Bitumen (raw mountain wax),% (not less than) 15,00
Humic acids,% (not less than) 79,60

Elemental composition of brown coal (leonardite)

N, % С, % S, % Н, % О, %
0,51 61,13 3,64 5,56 29,16

The content of harmful metals in the leonardite ash:

zinc – 46.6 μg / g; manganese – 33.1 μg / g; copper – 27.6 μg / g;
nickel – 16.9 μg / g; cadmium 0.32 μg / g; lead-17.7 μg / g.
Mercury and arsenic are contained in the ashes in the form of traces.

Among the elements studied, iron is released, the content of which is 3.42 mg / g of ash.
The data obtained indicate a low content of heavy metals in the test product, and the most dangerous of them (mercury and arsenic) are found only in the form of traces.

This is confirmed by the results of analyzes of Ukrainian and foreign laboratories, which are presented below.