1、Potential origin and formation for molecular components of humic acids

Soil humic acids are the base soluble/acid insoluble organic components of soil organic matter. Most of what we know about humic acids comes from studies of their bulk molecular properties or analysis of individual fractions after extraction from soils.

2、Humification and Humic Acid Composition of Suspended Soil in

Our study of the structural composition of humic substances in suspended soils was conducted with an aim of evaluating the humification rates and structural composition of humic acids in the suspended soil in tropical forests of South Vietnam.

3、Changes in the Properties of Humic Acids Due to the Effects of High

In the last humification stages, the complexity of humic acids (HAs) increases, leading to the formation of aromatic and carboxyl functional groups with complex substitutions, which behave as two- or three-component acids (Amoah-Antwi et al., 2022).

4、How is the Formation of Humic Acids

Humic substances are formed by the microbial degradation of dead plant matter, such as lignin. They are very resistant to further biodegradation. The precise properties and structure of a given sample depend on the water or soil source and the specific conditions of extraction.

Chemical Characteristics of Humic Substances in Nature

Humic substances are the main constituents of natural organic matter, found in both aquatic and terrestrial environments. Humic substances are a complex, dispersed, and heterogeneous mixture of various organic compounds synthesized from organic matter residues, decomposed by microorganisms.

Effects of Humic Acid and Suspended Solids on the Removal of Heavy

Adsorption is a common physico-chemical process used to remove heavy metals. Dissolved organic carbon (DOC) and suspended solids (SS) are associated pollutants in water systems that can interact...

Provenances, preponderances, and distribution of humic acids and

River sediments (also known as fluvial sediments) occur as material settled on the bottom of riverbeds, suspended in water, or transported by water currents (Gałuszka, 2020). The river water is responsible for transporting sediment along the river's course.

Formation Mechanisms of Humic Substances in the Environment

Formation Mechanisms of Humic Substances in the Environment P. M. Huang Ph.D., M.Sc., A. G. Hardie

Humic Substances: Hypotheses and Reality (a Review)

It is hypothesized that HSs are formed as a result of degradation and transformation of biomolecules of organic residues and free radical condensation reactions (a process called humification).

Vindication of humic substances as a key component of organic matter in

In response, we present an evidence-based rebuttal, detailing the decomposition processes of plant components and their transformation to a range of products, some of which, including humic substances, have a degree of resistance to microbial degradation.

Humic acid is a natural organic substance widely found in nature. It is formed through the microbial decomposition and transformation of plant and animal residues and constitutes a crucial component of soil. during the use of humic acid, suspended matter may appear, which can affect its effectiveness and potentially harm the environment. The following analyzes the causes of this phenomenon:

I. Raw Material Quality and Impurities

1. Quality of Raw Materials: If the raw materials for humic acid production are subpar, such as containing excessive soil, sand, or other impurities, these contaminants may remain as suspended particles during production, leading to turbidity or precipitation in the final product.
2. Incomplete Impurity Removal: During processing, failure to fully eliminate impurities—especially fine particulate matter—can result in suspended particles in the solution, compromising clarity and stability.
3. Improper Pretreatment of Raw Materials: If raw materials are not thoroughly cleaned or processed before use, surface contaminants like soil or plant residues may dissolve and form suspended matter, reducing product quality.

II. Inadequate Control in Production Process

1. Poor Dissolution Control: Inaccurate temperature or timing during the dissolution of humic acid may leave undissolved components, forming larger solid particles. These particles can later float due to density differences.
2. Inadequate Filtration and Precipitation: Insufficient filtration or precipitation steps during production may fail to remove larger particles, resulting in suspended matter. This affects both appearance and performance stability.
3. Defects in Concentration and Drying: Improper equipment or techniques during concentration and drying can cause uneven evaporation, generating fine bubbles and suspended particles. This compromises product purity and quality.

III. Improper Storage and Usage Conditions

1. Environmental Impact During Storage: Exposure to high temperatures or humidity during storage may cause volatile small molecules to escape, leaving behind solid particles that form suspended matter.
2. Improper Usage: Errors during application, such as incorrect dosage ratios or inadequate mixing, can produce excess suspended matter, diminishing effectiveness.
3. Long-Term Storage: Prolonged storage exposes humic acid to air, altering its structure and causing component precipitation. Over time, stability and quality may also degrade.

IV. Technological Improvements and Innovations

1. Optimizing Production Processes: Upgrading equipment and processes—e.g., using advanced filtration and drying technologies—enhances separation of solutes and solvents, reducing suspended matter formation.
2. Strengthening Quality Control: Implementing rigorous quality management systems, from raw material procurement to final product release, ensures compliance with standards through regular testing.
3. Developing New Products: Addressing existing issues through innovation, such as improving solubility and stability via novel materials and processes, minimizes suspended matter generation.

V. Environmental Protection and Sustainable Development

1. Reducing Environmental Pollution: Adopting eco-friendly measures—e.g., resource conservation, reduced energy consumption, and waste minimization—protects ecosystems during production.
2. Advancing Circular Economy: Promoting recycling and reuse in the humic acid industry improves resource efficiency while preventing secondary pollution through proper waste management.
3. Promoting Green Production: Encouraging environmentally friendly technologies, reducing emissions, and raising public awareness of sustainability fosters broader support for green practices.

the formation of suspended matter in humic acid results from multiple factors, including raw material quality, production processes, and storage conditions. A comprehensive approach addressing these aspects is essential to mitigate the issue.