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The study aims to examine how humic acid fertilizer influences mercury (Hg) emissions from greenhouse soils by analyzing soil mercury oxidation state transformations.

May 9, 2026EARTH AND ENVIRONMENT0 citations

Mechanistic Insights into the Effects of Humic Acid Fertilizer on Mercury Emissions from Greenhouse Soils Based on Mercury Oxidation State Transformations

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ZXZhanglin Xu RSRongguo Sun RSRongguo Sun

Key Points

The study aims to examine how humic acid fertilizer influences mercury (Hg) emissions from greenhouse soils by analyzing soil mercury oxidation state transformations.
Conducted a simulation experiment in greenhouse conditions with control and 1%, 3%, 5% humic acid treatment groups.
Analyzed soil mercury (Hg) flux and gaseous elemental mercury (GEM) concentration changes.
Investigated mechanisms through soil oxidation-reduction state and electron transfer analysis.
1%, 3%, and 5% HA treatments reduced Hg(0) release flux by 69.8%, 72.3%, and 73.6%, respectively.
GEM concentration in the greenhouse decreased by approximately 78% on average with HA treatment.
HA enhanced soil electron activity, promoting the transformation of Hg to more stable and less volatile forms.

Abstract

贵州喀斯特地区具有典型的汞(Hg)地质高背景特征，在设施农业条件下，土壤释汞Hg(0)过程易在封闭大棚环境中转化为更高的暴露风险。尽管腐殖酸肥(HA)被广泛应用于土壤改良和重金属固定，但其是否以及如何影响蔬菜大棚土壤释Hg(0)过程，目前仍缺乏直接认识。为此，本研究通过模拟蔬菜大棚培养实验，设置空白对照(CK)和1%、3%、5% HA处理组，系统分析土壤释Hg(0)通量和棚内气态元素汞(GEM)的浓度变化特征，并从土壤Hg价态转变和电子转移角度探讨其作用机制。结果表明，与CK相比，1%、3%、5% HA处理使土壤Hg(0)的释放通量分别降低69.8%、72.3%和73.6%，棚内GEM平均浓度下降约78%，且不同HA剂量间控Hg效果无显著差异(p > 0.05)。HA通过提升土壤电子(e-)活度负对数(pξ)，改变了土壤氧化还原状态与电子转移条件，使低价态Hg Hg(0)、Hg(I)相对减少，而高价态的Hg(II)相对增加，整体表现为Hg向较稳定、较难挥发的价态转化。HA对土壤释Hg(0)的抑制主要通过影响Eh、CEC、有机质及Hg价态的分配来实现，进而削弱可挥发Hg(0)供给并降低释Hg(0)通量。相关结果可为高背景区蔬菜大棚土壤释Hg(0)风险防控提供潜在的绿色调控思路。

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Xu et al. (2026) studied this question.

synapsesocial.com/papers/69fecfafb9154b0b82876b20 https://doi.org/10.3724/ee.1672-9250.2026.54.059

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May 9, 2026EARTH AND ENVIRONMENT0 citations

Mechanistic Insights into the Effects of Humic Acid Fertilizer on Mercury Emissions from Greenhouse Soils Based on Mercury Oxidation State Transformations

View Full Paper

ZXZhanglin Xu RSRongguo Sun RSRongguo Sun

Key Points

The study aims to examine how humic acid fertilizer influences mercury (Hg) emissions from greenhouse soils by analyzing soil mercury oxidation state transformations.
Conducted a simulation experiment in greenhouse conditions with control and 1%, 3%, 5% humic acid treatment groups.
Analyzed soil mercury (Hg) flux and gaseous elemental mercury (GEM) concentration changes.
Investigated mechanisms through soil oxidation-reduction state and electron transfer analysis.
1%, 3%, and 5% HA treatments reduced Hg(0) release flux by 69.8%, 72.3%, and 73.6%, respectively.
GEM concentration in the greenhouse decreased by approximately 78% on average with HA treatment.
HA enhanced soil electron activity, promoting the transformation of Hg to more stable and less volatile forms.

Abstract

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Cite This Study

Xu et al. (2026) studied this question.

synapsesocial.com/papers/69fecfafb9154b0b82876b20 https://doi.org/10.3724/ee.1672-9250.2026.54.059

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