coal contains humic it

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  Coal: Chemical Behavior with Increasing Rank | SpringerLink

  2022928 · Every coal contains moisture, and its presence lowers the calorific value and hence it is undesirable. Lower the rank of a coal, higher is its moisture (air-dried) content.

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  Chemical Structure and Biological Activity of Humic …

  2021413 · A study testing 37 humic fractions—characterized by isotopic composition, structural characteristics, and chemical properties responsible for stimulation of root traits—showed that the fractions shared some structural similarity although differing in their stimulation activity on plant roots [ 8 ].

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  Concentrating rare earth elements in brown coal humic acids …

  20211111 · The REE concentration process in the samples of mechanochemically activated coal can be attributed both to formation of new oxygen-containing groups in humic acids (HA) and to binding of REEs to oxygen-containing groups already contained in coal due to vigorous solid-phase mechanical mixing.

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  Response of maize roots to different additive amounts of weathered coal ...

  2019116 · Abstract 【Objective】Weathered coal humic acid possesses abundant reserves in China, which has multiple active functional groups. The response of roots to humic acid, which acts as a humic acid ...

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  Humic substances derived from unconventional resources: …

  202346 · Humic substances comprise up to 70% of the total organic matter in soils, between 50 and 80% of the dissolved organic matter in water, and about 25% of dissolved organic matter in groundwater. Elucidation of the complex structure and properties of humic substances requires advanced analytical tools; however, they are of fundamental …

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  Humic Acid Fertilizer For Plants: A Complete Guide

  202311 · What is Humic acid used for on plants? Humic acid is a complex group of compounds derived from the decomposition of ancient plant and animal material, extracted from coal or peat. It contains a variety of different chemicals, with properties ranging from root support, nutrient transport and into improving overall soil condition.

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  Characterization of Ultrafiltration-Fractionated Humic …

  2022623 · Abstract: Weathered coal is a widely used raw material of farm-oriented humic acid in China, while the high heterogeneity impedes its sufficient utilization. In this study, we fractionated the humic acid derived from Chinese weathered coal by ultrafiltration, and three fractions with the molecular range of 100 kDa, 10–100 kDa, 10 kDa were ...

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  Frontiers | Understanding the Role of Humic Acids on Crop …

  202231 · Humic acids (HA) are organic molecules that play essential roles in improving soil properties, plant growth, and agronomic parameters. The sources of HA include coal, lignite, soils, and organic materials. Humic acid-based products have been used in crop production in recent years to ensure the sustainability of agriculture production.

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  Humic acids: Structural properties and multiple …

  201651 · Humic acids (HAs) are macromolecules that comprise humic substances (HS), which are organic matter distributed in terrestrial soil, natural water, and sediments resulting from the decay of vegetable and natural residues [1]. Commercial HAs are extracted from peat and coal, which are non-renewable sources of carbon.

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  PHYSICAL STRUCTURE AND PROPERTIES OF BROWN COAL

  199111 · This chapter discusses physical structure and properties of brown coal. Brown coal is composed of a poly-dispersed collection of particulate entities ranging from small molecules such as fulvic acids, humic acids, humic acid macromolecules, small plant residues, such as spores, collapsed cells, and pieces of wax and resin right through to ...

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