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Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water

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A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Soil and Plant Nutrition".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 17645

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Special Issue Editors

Dr. Ting Li

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Guest Editor

College of Resources, Sichuan Agricultural University, Chengdu 611130, China
Interests: soil fertility; soil potassium; soil ecological processes

Dr. Ming Li

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Guest Editor

State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Nanjing 210042, China
Interests: biochar; remediation of heavy metal contaminated soil; soil carbon sequestration

Dr. Kang Tian

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Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Interests: geochemical baseline of heavy metals; source identification; migration and transformation; bioavailability; health risks

Special Issue Information

Dear Colleagues,

In recent years, heavy metal pollution has received widespread research attention. Heavy metals are highly toxic elements which are persistent in the natural environment, resulting in magnification throughout the food chain, adversely affecting both human and environmental health. Heavy metals that are of environmental importance include cadmium, lead, arsenic, and mercury. Thus, these metals which are released into the environment should constantly be monitored and controlled, and there should be remediation for heavy metals in contaminated soils and water.

This Special Issue will welcome contributions in the field of interest, including sources of heavy metal pollution monitoring, management and mitigations, appropriate restoration, and treatment plans in agriculture, to inform researchers and other stakeholders regarding the prevention of heavy metal pollution of water and soil.

Dr. Ting Li
Dr. Ming Li
Dr. Kang Tian
Guest Editors

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Keywords

heavy metals
contamination
toxic metals
soil ecological risk
risk assessment
remediation techniques

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Published Papers (9 papers)

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Research

12 pages, 1984 KiB

Open AccessArticle

Effect of Water Management under Different Soil Conditions on Cadmium and Arsenic Accumulation in Rice

by Xia Li, Ya Zhou, Lihui Luo, Peng Wang and Rui You

Agronomy 2023, 13(10), 2472; https://doi.org/10.3390/agronomy13102472 - 25 Sep 2023

Cited by 1 | Viewed by 1354

Abstract

Water management and soil conditions affect the bioavailability of cadmium (Cd) and inorganic arsenic (As) in the soil, and hence, their accumulation in rice grains. A field experiment was conducted to investigate the effects of two water management regimes (flooding and dry–wet alternation) on Cd and inorganic As uptake and transport in rice under different soil conditions (paddy soil developed from gray-brown alluvium, K1; paddy soil developed from weathered shale and slate, K2) in the Sichuan Basin, Western China. The results indicated that compared to the wet–dry rotation, long-term flooding led to a substantial decrease of 49.3~55.8% in soil-available Cd content (p < 0.05), accompanied by a significant increase of 16.0~74.2% in As(Ⅲ) content (p < 0.05), causing no significant difference in As(V) content at the K1 site (p > 0.05). However, differences in soil-available Cd and inorganic As content under different water management treatments were both insignificant at the K2 site (p > 0.05). Long-term flooding treatment at the K1 site resulted in a remarkable reduction of 90.2% in Cd content in rice husks and 92.2% in brown rice (p < 0.05), along with a significant increase of 263.6% and 153.3%, respectively, in As(Ⅲ) content; no significant differences in As(V) content were observed at the K2 site (p > 0.05). In conclusion, the effect of water management on rice Cd and inorganic As varied under different soil conditions, with the change in rice Cd and inorganic As in paddy soil developed from gray-brown alluvium being significantly greater than that in paddy soil developed from weathered shale and slate. Full article

(This article belongs to the Special Issue Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water)

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12 pages, 1879 KiB

Open AccessArticle

Influencing Factors of Elevated Levels of Potentially Toxic Elements in Agricultural Soils from Typical Karst Regions of China

by Yubo Wen, Yuanyuan Wang, Wenbing Ji, Ning Wei, Qilin Liao, Dingling Huang, Xianqiang Meng and Yinxian Song

Agronomy 2023, 13(9), 2230; https://doi.org/10.3390/agronomy13092230 - 26 Aug 2023

Cited by 6 | Viewed by 1199

Abstract

Agricultural soils originating from carbonate rocks within karst regions exhibit inherent high concentrations of potentially toxic elements (PTEs) due to geogenic processes. However, the influencing factors of the elevated levels of PTEs in the naturally contaminated karst regions remain inadequately comprehended. This research investigates the chemical compositions of 278 soils derived from carbonate rocks. Descriptive statistics, stepwise multiple regression, and the random forest (RF) method were applied to screen the significant factors that affect the distribution, migration, and enrichment of the PTEs in soils. Cadmium (Cd) and arsenic (As) are the most highly contaminated PTEs in the soils of the study area, and the average contents of Cd and As in soils are 11.5 and 2.92 times the national soil background value, respectively. The pollution risk ranking of PTEs is Cd > As > Cr > Zn > Pb > Cu > Ni > Hg, using the proportion exceeding the risk screening thresholds of agricultural land as the standard. Soil Fe₂O₃ and Mn contents, soil pH and total organic carbon (TOC) values, and weathering intensity (characterized using the chemical index of alternation, CIA) are the most important factors influencing the PTE levels in agricultural soils. Full article

(This article belongs to the Special Issue Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water)

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15 pages, 2268 KiB

Open AccessArticle

Mechanisms of Cadmium Tolerance and Detoxification in Two Ornamental Plants

by Yongxia Jia, Peixi Yue, Keheng Li, Yihui Xie, Ting Li, Yulin Pu, Xiaoxun Xu, Guiyin Wang, Shirong Zhang, Yun Li and Xian Luo

Agronomy 2023, 13(8), 2039; https://doi.org/10.3390/agronomy13082039 - 31 Jul 2023

Cited by 2 | Viewed by 1254

Abstract

Cadmium (Cd) is an important environmental heavy metal and one of the main soil pollutants in southwest China and even the Yangtze River Basin because of its toxicity to plants and humans. To clarify the potential of Euryops pectinatus L. and Gardenia jasminoides J. and the mechanism they use to remediate Cd-contaminated soil, a soil pot experiment with 0, 5, 10, 20, and 40 mg kg⁻¹ of Cd was used to investigate the accumulation characteristics, subcellular distribution, chemical forms, and the antioxidative defense systems of the two ornamental plants. When the concentration of Cd was below 40 mg kg⁻¹, it promoted the growth of E. pectinatus shoots, and the tolerance index (TI) was >1. However, 20–40 mg kg⁻¹ Cd significantly inhibited the growth of G. jasminoides, and the TI was <1. The shoots of both varieties accumulated more Cd than the roots, and the E. pectinatus shoots accumulated more Cd (1.45 mg plant⁻¹) than those of G. jasminoides (0.71 mg plant⁻¹). The Cd in E. pectinatus and G. jasminoides was primarily distributed in the soluble fraction (52.83–68.97%) and cell walls (44.62–54.98%), respectively. Higher proportions of Cd bound to NaCl and acetic acid (HAc) in E. pectinatus (55.32–73.44%) than in G. jasminoides (42.94–61.58%), while the inorganic and water-soluble proportions of Cd bound in the opposite manner. E. pectinatus maintained high activities of antioxidant enzymes under Cd treatments, and its levels of malondialdehyde (MDA) and relative electrical conductivity (REC) were comparable to those of the control. Nonetheless, G. jasminoides had low levels of activity of antioxidant enzymes, but its levels of MDA and REC were significantly higher than those of the control under the 20–40 mg kg⁻¹ Cd treatment. Therefore, both types of plants have a strong ability to tolerate and accumulate Cd, which makes them suitable for the remediation of Cd-polluted soil. However, E. pectinatus is more effective at remediating Cd and tolerant to it than G. jasminoides. These plants utilize different mechanisms to detoxify Cd. Full article

(This article belongs to the Special Issue Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water)

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18 pages, 10829 KiB

Open AccessEditor’s ChoiceArticle

A Novel Approach for Predicting Heavy Metal Contamination Based on Adaptive Neuro-Fuzzy Inference System and GIS in an Arid Ecosystem

by Elsayed Said Mohamed, Mohamed E. M. Jalhoum, Abdelaziz A. Belal, Ehab Hendawy, Yara F. A. Azab, Dmitry E. Kucher, Mohamed. S. Shokr, Radwa A. El Behairy and Hasnaa M. El Arwash

Agronomy 2023, 13(7), 1873; https://doi.org/10.3390/agronomy13071873 - 15 Jul 2023

Cited by 6 | Viewed by 1756

Abstract

The issue of agricultural soil pollution is especially important as it directly affects the quality of food and the lives of humans and animals. Soil pollution is linked to human activities and agricultural practices. The main objective of this study is to assess and predict soil contamination by heavy metals utilizing an innovative method based on the adaptive neuro-fuzzy inference system (ANFIS), an effective artificial intelligence technology, and GIS in a semiarid and dry environment. A total of 150 soil samples were randomly collected in the neighboring area of the Bahr El-Baqar drain. Ordinary kriging (OK) was employed to generate spatial pattern maps for the following heavy metals: chromium (Cr), iron (Fe), cadmium (Cd), and nickel (Ni). The adaptive neuro-fuzzy inference system (ANFIS), known as one of the most effective applications of artificial intelligence (AI), was utilized to predict soil contamination by the selected heavy metals (Cr, Fe, Cd, and Ni). In total 150 samples were used, 136 soil samples were used for training and 14 for testing. The ANFIS predicting results were compared with the experimental results; this comparison proved its effectiveness, as a root mean square error (RMSE) was 0.048594 in training, and 0.0687 in testing, which is an acceptable result. The results showed that both the exponential and spherical models were quite suitable for Cr, Fe, and Ni. The correlation values (R²) were close to one in training and test; however, the stable model performed well with Cd. The high concentration of heavy metals was the most prevalent, encompassing approximately 51.6% of the study area. Furthermore, the average concentration of heavy metals in this degree was 82.86 ± 15.59 mg kg⁻¹ for Cr, 20,963.84 ± 4447.83 mg kg⁻¹ for Fe, 1.46 ± 0.42 mg kg⁻¹ for Cd, and 48.71 ± 11.88 mg kg⁻¹ for Ni. The comparison clearly demonstrates that utilizing the ANFIS model is a superior option for predicting the level of soil pollution. Ultimately, these findings can serve as a foundation for decision-makers to develop acceptable measures for mitigating heavy metal contamination. Full article

(This article belongs to the Special Issue Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water)

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17 pages, 2810 KiB

Open AccessArticle

Adsorption of Pb²⁺ and Cd²⁺ in Agricultural Water by Potassium Permanganate and Nitric Acid-Modified Coconut Shell Biochar

by Hengji Qin, Xiaohou Shao, Hiba Shaghaleh, Wei Gao and Yousef Alhaj Hamoud

Agronomy 2023, 13(7), 1813; https://doi.org/10.3390/agronomy13071813 - 7 Jul 2023

Cited by 8 | Viewed by 2068

Abstract

Biochar prepared from agricultural waste resource coconut shells was used as the original charcoal, which was oxidatively modified and characterized using batch adsorption tests before and after modification by SEM, FTIR, surface area, and elemental analyses. The removal capacity and adsorption mechanism of the modified biochar for Pb²⁺ and Cd²⁺ in water were investigated, and its adsorption kinetics and thermodynamics were discussed. The findings demonstrated that the specific surface area of potassium permanganate and nitric acid-modified coconut shell carbon (MHBC) is 3.02 times than that of the coconut shell carbon (BC). The kinetic data of adsorption of Pb²⁺ and Cd²⁺ on MHBC were more in accordance with the pseudo-second order kinetic model, indicating that chemical adsorption played a dominant role, and the adsorption rate gradually tended to balance with a decrease in solution ion concentration. The isothermal thermodynamic data of the adsorption of Pb²⁺ and Cd²⁺ by MHBC conformed to the Langmuir model. At pH = 5.5, the maximum adsorption capacities of Pb²⁺ and Cd²⁺ were 160.41 mg·g⁻¹ and 47.46 mg·g⁻¹, respectively. Thermodynamic parameter fitting showed that the process of adsorption of Pb²⁺ and Cd²⁺ by MHBC is a spontaneous endothermic reaction. The higher the temperature is, the stronger the adsorption capacity is. When the ions coexist, Pb²⁺ and Cd²⁺ have obvious competitive adsorption, and Pb²⁺ has a significant competitive advantage. Among them, MHBC has high adsorption and good reusability for Pb²⁺ and Cd²⁺, and has good practical application prospects. Full article

(This article belongs to the Special Issue Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water)

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15 pages, 3410 KiB

Open AccessArticle

Geochemical Behaviors of Heavy Metal(loid)s in Soil Ferromanganese Nodules in Typical Karst Areas in Southwest China

by Wenbing Ji, Zhixiang Luo, Jianyu Huang, Xu Liu, Haiyun He, Yang Gong, Meng Chen, Yubo Wen and Rongrong Ying

Agronomy 2023, 13(6), 1602; https://doi.org/10.3390/agronomy13061602 - 13 Jun 2023

Cited by 2 | Viewed by 1548

Abstract

The ferromanganese nodules (FMNs) developing in soils of karst regions are naturally characterized by high heavy metal(loid)s contents due to several geological factors. Soil FMNs can considerably influence the geochemical behaviors of soil heavy metal(loid)s. However, the mechanisms of the FMN effects in soils of karst areas soils remain unclear, resulting in less understanding of the development process of karst soils. Therefore, the present study aims to investigate 21 individual FMNs collected in soils derived from carbonate rocks in Guangxi province, China, to reveal the mechanisms of heavy metal(loid)s enrichment in FMNs. The studied soil FMNs were mainly composed of Fe₂O₃, SiO₂, Al₂O₃, MnO₂, and TiO₂, with proportions of 25.95, 20.8, 19.07, 3.98, and 1.23%, respectively. Compared to the background soils of Guangxi, the soil FMNs exhibited great enrichment in heavy metal(loid)s. The enrichment factors followed the order of Cd (243.33), Cr (49.67), Cu (5.46), Ni (8.37), Pb (23.68), Zn (15.4), and As (20.11). The heavy metal(loid)s contents in the soil FMNs of the karst areas were much higher than those observed in non-karst areas worldwide. According to the principal component analysis (PCA) results, the first three principal components contributed to about 88.81% of the total variance of the FMN compositions. PC1 (50.90%) suggested the presence of quartz, feldspar, and clay minerals-related elements in the soil FMNs, whereas PC2 (27.10%) and PC3 (10.81%) indicated the presence of Mn(oxyhydr)oxides and Fe(oxyhydr)oxides-related elements in the soil FMNs, respectively. The obtained selective extraction results demonstrated that up to 93% of the total contents of heavy metal(loid)s, namely, Cd, Pb, Cu, Ni, and Zn, were bound to Mn(oxyhydr)oxides. In contrast, oxyanionic species (As and Cr) were predominantly sequestered in Fe(oxyhydr)oxides. Full article

(This article belongs to the Special Issue Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water)

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12 pages, 1526 KiB

Open AccessArticle

Enhanced Phytoremediation for Trace-Metal-Polluted Farmland with Hibiscus cannabinus–Sedum plumbizincicola Rotation: A Case Study in Hunan, China

by Shuaishuai Gao, Yuan Guo, Xueying Cao, Caisheng Qiu, Huajiao Qiu and Xinlin Zhao

Agronomy 2023, 13(5), 1231; https://doi.org/10.3390/agronomy13051231 - 27 Apr 2023

Cited by 3 | Viewed by 1612

Abstract

Trace metal pollution in farmland threatens the health of both crops and humans. Restoring these polluted farmlands safely and utilizing them to elevate farmers‘ incomes are extremely needed. Phytoremediation is a promising method for metal extracting but its popularization is limited by both its low efficiency and the low economic value of the plants used. Herein, a field study was conducted to investigate the potential of using a rotation with the hyperaccumulator of Sedum plumbizincicola and kenaf (Hibiscus cannabinus) for combined heavy-metal-contaminated farmland remediation. Results showed that the kenaf obtained an aerial biomass of up to 21 Mg ha⁻¹ under combined heavy metal contaminations, which was significantly higher than that for S. plumbizincicola (<8 Mg ha⁻¹). However, the concentrations of Cd, Cu, Pb, and Zn in S. plumbizincicola were at least 100, 2, 8, and 75 fold higher than that for kenaf, respectively. The removal of Cd, Pb, and Zn for S. plumbizincicola can be more than 3800, 720, and 104,347 g ha⁻¹, which was at least 38, 3, and 27 times higher than that for kenaf, respectively. Finally, the removal of Cd, Cu, Pb, and Zn by rotation of the two crops was increased by 7.88%, 126%, 33.5%, and 4.39%, respectively, compared with the S. plumbizincicola monoculture. Hence, the rotation with kenaf and S. plumbizincicola can not only remove more heavy metals from the contaminated soil and accelerate the phytoremediation pace, but also can supply a large number of raw materials for industrial applications. Full article

(This article belongs to the Special Issue Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water)

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20 pages, 2256 KiB

Open AccessArticle

Environmental Assessment of Soils and Crops Based on Heavy Metal Risk Analysis in Southeastern China

by Xinyu Mao, Jingjing Sun, Hiba Shaghaleh, Xiaosan Jiang, Huaizhi Yu, Senmao Zhai and Yousef Alhaj Hamoud

Agronomy 2023, 13(4), 1107; https://doi.org/10.3390/agronomy13041107 - 12 Apr 2023

Cited by 11 | Viewed by 3458

Abstract

Heavy metal pollution in soil–crop systems has attracted great attention globally, caused by rapid urbanization and intensive industrialization. The research aims to investigate the environmental quality of the agricultural production area in Taizhou City, a typical economic region that is along the Yangtze River in the Southeast of China. A total of 370 sampling sites were chosen, with 370 soil, rice (Oryza sativa L.) and wheat (Triticum aestivum L.) samples collected, respectively, for measuring and analyzing the status, spatial distribution and pollution level of different heavy metals. The mean values of soil Cr, Pb, Cd, As and Hg were 66.78, 32.88, 0.23, 8.16 and 0.16 mg/kg, which were lower than the risk control standard values (RCV). However, the mean values of Pb, Cd and Hg were 1.25-, 1.77- and 2-fold larger than their soil background values (SBV) due to the intensive anthropogenic activities. The average content of Cd in rice exceeded its food safety limiting values (FCV) by 0.05 mg/kg, and the average contents of Pb in rice and wheat both exceeded the relevant FSV by 0.42 and 0.186 mg/kg, respectively. In addition, the maximum As and Cr contents in rice and wheat could be 0.13, 0.46 mg/kg and 0.63, 3.5 mg/kg larger than the relative FCVs in certain areas. Most of the high-value areas of soil and crop heavy metals were mainly located in Xinghua City, Taixing City and Jiangyan District, which had a similar distribution pattern with local industries or anthropogenic activities. The heavy metal pollution in soils and crops was found to be inconsistent, as 8.94% of the arable land possessed lightly metal pollution, while 3.18% of the area of rice and 4.0% of the area of wheat suffered severe pollution, with excessive accumulation of Cr, Pb and Cd. Based on the heavy metal pollution assessment of soil–crop systems, approximately 83% of the study area possessed medium or higher environmental quality, which was preferable for agricultural production. Our results implied that the spatial distribution and pollution level of the heavy metals in soil–crop systems were significantly influenced by industrial activities, followed by agricultural sources, transportation emissions and so on. Therefore, continuous monitoring and source control of heavy metals, especially for Cr, Pb and Cd, should be conducted to ensure the regional environmental quality and food security. Full article

(This article belongs to the Special Issue Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water)

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15 pages, 4716 KiB

Open AccessArticle

Geochemical Characteristics of Typical Karst Soil Profiles in Anhui Province, Southeastern China

by Wenbing Ji, Yuanyuan Lu, Min Yang, Jian Wang, Xiaoyu Zhang, Caiyi Zhao, Bing Xia, Yunjin Wu and Rongrong Ying

Agronomy 2023, 13(4), 1067; https://doi.org/10.3390/agronomy13041067 - 6 Apr 2023

Cited by 4 | Viewed by 2353

Abstract

The geographical distributions of Cd and several other heavy metals (HMs) (Hg, Cu, Ni, Pb, Zn, Cr, As, Co, and V) were characterized in 90 (p > 0.05) terra rossa samples across the Anhui karst area. Significant enrichment of HM was observed in this soil, mainly associated with the weathering of Cd-enriched carbonate rocks. Then, this enrichment was developed in 31 profiles. Our investigations revealed pedogenic processes as the dominant factors accounting for the enrichment of Hg, Cu, Ni, As, Co, and V. We also observed that all soil samples had a silty clay texture, with a pH scope of 4.08–8.04 and a median value of 6.50. In addition, the soil samples had relatively high saturation, with basic cations over 6.68%. The enrichment of the HMs based on their distinct factors were as follows: Cd (3.92) > As (2.55) > Zn (1.62) > Ni (1.50) > Cu (1.47) > Pb (1.47) > V (1.43) > Cr (1.23) > Co (1.19) > Hg (1.12). Finally, terra rossa samples derived from carbonate rocks were categorized as Cambisols, Luvisols, and Regosols. The soil profiles of Cambisols and Luvisolsis were less developed, so the HM concentrations were relatively low. The Regosols profile contained the highest total Cd concentration and exhibited a higher capacity to immobilize Cd compared with other soil profiles. Regosols are also characterized by high pH values (scope of 7.05 to 8.22, with an average value of 7.56). The contents of HM also exhibited minor changes across the Regosol, Cambisol, and Luvisol profiles, implying that the karst development degrees of weathering in Anhui were relatively low. Full article

(This article belongs to the Special Issue Evaluation and Management of Heavy Metal Contamination in Agricultural Soil and Water)

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