Effect of Humic Acid Fertilizer on Mercury Release from Greenhouse Soils

The elemental mercury (Hg0) release characteristics from the Hg-contaminated soil applied with Humic acid fertilizer (HAF) in the greenhouse were identified. The adsorption features of mercuric ion (Hg2+) on HAF under different reaction times and pH were investigated to elucidate the influencing mec...

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Published inNature environment and pollution technology Vol. 23; no. 1; pp. 451 - 458
Main Authors Zhao, Z., Long, L. Y., Gu, H., Sun, R. G.
Format Journal Article
LanguageEnglish
Published Karad Technoscience Publications 01.03.2024
Subjects
Acidic soils
Acids
Adsorption
Air temperature
Electron micrographs
Fertilizers
Fluxes
Fourier transforms
Greenhouses
Humic acids
Infrared spectroscopy
Light intensity
Luminous intensity
Mercury
Mercury (metal)
Mining
Moisture content
Organic matter
Oxidation
Oxidation-reduction potential
Redox potential
Soil chemistry
Soil contamination
soil mercury release, humic acid fertilizer, greenhouse, hg-contaminated soil
Soil moisture
Soil pH
Soil pollution
Soil temperature
Spectrometry
United States > US
China
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Summary:The elemental mercury (Hg0) release characteristics from the Hg-contaminated soil applied with Humic acid fertilizer (HAF) in the greenhouse were identified. The adsorption features of mercuric ion (Hg2+) on HAF under different reaction times and pH were investigated to elucidate the influencing mechanism of HAF on soil Hg0 release. Besides, the microstructure of HAF loading with Hg2+ was characterized by using Fourier transform infrared spectroscopy (FTIR) and scanning electron micrograph-energy dispersive spectrometry–EDS). The results showed that with the increasing HAF dosage, soil oxidation-reduction potential (Eh), and organic matter (SOM) content, as well as the decreasing soil pH, the soil Hg0 release fluxes showed a decreasing tendency. The soil pH, Eh, SOM, and total Hg content are the key factors that can affect the soil Hg0 release fluxes. The interior air temperature, light intensity, soil moisture, and soil temperature have little impact on soil Hg0 release fluxes when the greenhouse soil is applied with HAF. The HAF can immobilize Hg2+ and reduce its activity by surface precipitation and specific adsorption, then affecting the soil Hg0 release fluxes. The results of this study provide a basis for the application of HAF to reduce soil Hg0 release fluxes in the greenhouse of Hg-contaminated areas.
ISSN:2395-3454
0972-6268
2395-3454
DOI:10.46488/NEPT.2024.v23i01.040