Lime-Phosphorus Fertilizer Efficiently Reduces the Cd Content of Rice: Physicochemical Property and Biological Community Structure in Cd-Polluted Paddy Soil

Due to the biomagnifying effect in the food chains, heavy metals will cause serious harm to the food produced in paddy soil, and then threaten human health. The remediation of soil heavy metals by the addition of amendments is a common method. However, the combination of the two amendments has been less studied and its effect is unknown. In this study, we investigated the effects of different concentrations of a lime and calcium-magnesium phosphate (CMP) amendments metal availability and paddy soil bacteria biodiversity. The experiment proves that the addition of 0.5 and 1.0‰ amendment can effectively reduce cadmium (Cd) availability and the cadmium content in rice to be below 0.2 mg/kg, meeting the national food safety level. The results demonstrate that increasing pH and phosphorous (P) in soil were two important factors decreasing available cadmium. Furthermore, biodiversity analysis of the treated soil showed that the amendment increased biodiversity. Proteobacteria and Chloroflex were the most abundant bacteria at the phylum level, followed by Acidobacterium and Nitrospirae. The abundance of Bacterodietes-vadinHA17, Syntrophaceae, and Thiobacillus increased as phosphorous increased. Cadmium passivation might induce those species.

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Heavy Metals Accumulation and Health Risk Consumption in Some Vegetables, Isfahan, Iran

Annals of Military and Health Sciences Research ◽

10.5812/amh.101311 ◽

2021 ◽

Vol In Press (In Press) ◽

Author(s):

Arasb Dabbagh Moghadam ◽

Ahmad Shahmoradi

Keyword(s):

Heavy Metals ◽

Dry Matter ◽

Groundwater Resources ◽

Food Chains ◽

Cadmium Content ◽

Great Understanding ◽

Health Index ◽

Management Options ◽

Heavy Metals Accumulation ◽

Metals Accumulation

: Heavy metals (HM) can enter the human body via food chains or contaminate groundwater resources. The current study aimed to investigate HM contamination in vegetables and its associated health index risk (HIR) in Isfahan, Iran. The lowest amount of HM was observed for Cd and Pb in all vegetables. The highest level of Cadmium content was found in potato (1.153 mg kg-1 dry matter (DM)) and spinach (1.180 mg kg-1 DM). The highest levels of As and Cu were observed in lettuce, while the lowest content of Cu was in the carrot. Moreover, the highest content of N (344.00 mg kg-1 DM) was obtained in spinach. The As and P were higher than standard amounts, and HIR was higher than 1 for these two elements. Heavy metal's HIR through ingestion vegetables were a great concern, and there has been particularly increased attention to As. A great understanding of the ecological effects of HM on soils and vegetables is needed to develop management options.

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Leaching of heavy metals from lead-zinc mine tailings and the subsequent migration and transformation characteristics in paddy soil

Chemosphere ◽

10.1016/j.chemosphere.2021.132792 ◽

2021 ◽

pp. 132792

Author(s):

Rongguo Sun ◽

Yue Gao ◽

Yang Yang

Keyword(s):

Heavy Metals ◽

Paddy Soil ◽

Mine Tailings ◽

Lead Zinc ◽

Zinc Mine

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Heavy Metals, Trophic Levels, Food Chains, and Future Risks

Marine Science - Habitat, Population Dynamics, and Metal Levels in Colonial Waterbirds ◽

10.1201/b20219-15 ◽

2016 ◽

pp. 425-452

Keyword(s):

Heavy Metals ◽

Trophic Levels ◽

Food Chains

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Electrochemical attributes and availability of nutrients, toxic elements, and heavy metals in tropical soils

Scientia Agricola ◽

10.1590/s0103-90162006000600014 ◽

2006 ◽

Vol 63 (6) ◽

pp. 589-608 ◽

Cited By ~ 45

Author(s):

Mauricio Paulo Ferreira Fontes ◽

Luís Reynaldo Ferracciú Alleoni

Keyword(s):

Heavy Metals ◽

Electrochemical Properties ◽

Toxic Elements ◽

Chemical Speciation ◽

Surface Complexation ◽

Tropical Soils ◽

Metal Availability ◽

Ionic Exchange ◽

Weathered Soils ◽

Highly Weathered Soils

Electrochemical properties of soils are very important for the understanding of the physico-chemical phenomena which affect soil fertility and the availability of nutrients for plants. This review highlights the electrochemical properties of tropical soils, the behavior and the availability of nutrients, toxic elements and heavy metals in the soil, especially for soils with predominant variable charge minerals. Availability of the elements is related to ionic exchange, solution speciation, and electrostatic and specific adsorptive soil properties. Empirical and surface complexation models are briefly described, and some results of their application in tropical soils are presented. A better understanding of the role of the double diffuse layer of charges and CEC on nutrient cation availability for highly weathered soils is required, as well as a solid comprehension of surface complexation models, in order to improve the knowledge regarding the behavior of anions in soils. More studies have to be conducted to generate results that enable the use of chemical speciation concepts and calculation of several constants used in surface complexation models, especially for highly weathered soils from the humid tropics. There has to be a continuing development and use of computer softwares that have already incorporated the concepts of chemical speciation and adsorption models in the study of nutrients, toxic elements and heavy metal availability in the soil-plant system.

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