Influencing Factors and Prediction Models of Mercury Phytoavailability and Transference in a Soil-Lettuce System under Chinese Agricultural Soils

文献类型： 外文期刊

第一作者： Ullah, Subhan

作者： Ullah, Subhan;Darma, Aminu Inuwa;Yang, Jianjun;Ullah, Subhan;Hussain, Sajjad;Xia, Xing;Feng, Ya;Noor, Yousaf;Khanam, Tasawar;Khanam, Tasawar

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关键词： Hg contamination; lettuce; soil pH; path analysis; prediction models

期刊名称：AGRONOMY-BASEL （ 影响因子：3.3； 五年影响因子：3.7 ）

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年卷期： 2024 年 14 卷 7 期

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收录情况： SCI

摘要： Mercury (Hg) is a highly toxic contaminant posing serious ecological and human health risks. This study investigates the Hg transfer characteristics and prediction models in a soil-lettuce system, employing bioconcentration factors (BCF), path analysis (PA), and Freundlich-type functions. A pot experiment was conducted in a greenhouse, where lettuce was grown in a range of Chinese agricultural soils (n = 21) and deliberately spiked with Hg using Hg(NO3)2 solution. The results indicated that lettuce grown in Hg-spiked acidic soils (pH < 6.5) accumulated total Hg (THg) levels up to 14.01 g kg(-1), surpassing the safe consumption limit of 10 mu g kg(-1). The BCF for lettuce THg was less than 1.0, suggesting a low transfer of Hg from soil to lettuce. Notably, BCF values were significantly higher in acidic soils (0.02) compared to alkaline soils (0.005). Path analysis accounted for 82% of the variation in lettuce THg content, identifying soil THg, pH, and amorphous (Amo) Al and Fe oxides as primary direct factors. Additionally, soil-available Hg (AvHg), exchangeable Hg (ExHg), clay, and organic matter (OM) were significant indirect factors affecting lettuce THg content. To validate the findings of the path analysis, an extended Freundlich-type equation was developed using stepwise multiple linear regression (SMLR). This model exhibited high predictive accuracy (R-2 = 0.82, p <= 0.001), with soil pH, THg, and amorphous Al and Fe oxides being the key variables for predicting Hg transfer in the soil-lettuce system. The insights from this study can guide the management of safe lettuce production in Hg-contaminated soils, ensuring the mitigation of Hg exposure through agricultural produce.

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