**6. Final considerations**

Humic substances have made great strides in understanding the supramolecular structure and it have been widely accepted by several researchers. However, its structure is not yet fully defined and several issues remain under discussion by the scientific community. The fact is that these substances can be used to improve the quality and structure of the soil. Humic substances have unique chemical properties that benefit the soil in different ways, for example, it acts to combat soil erosion, improves the development of plants and removes pollutants from the soil. These characteristics indicate that humic substances play an important role in mitigating areas degraded by the phytoremediation technique. As for the aquatic system, humic substances can be used in the remediation of wastewater. In the treatment of leachate in landfills, humic substances can act as organic fertilizers for agricultural soils. On the other hand, these substances are a problem in drinking water for human consumption and must be treated efficiently to avoid damage to human health.

*Humic Substances*
