Effect of Metal Oxide Nanoparticles on the Chemical Speciation of Heavy Metals and Micronutrient Bioavailability in Paddy Soil

Long

et al. 2020

IJERPH

Self Cite

Tailings ponds are a main heavy metal pollution source in mining areas. In this study, the geo-accumulation index (Igeo) and the potential ecological risk index (RI) are used to evaluate the environmental impact of Hongtou Mountain (HTM) tailings pond on the surrounding area. Farmland soil, surface water, and sediment samples in the Hun River around the HTM tailings pond were collected. Heavy metal contents in the samples were analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Results show that Cu, Zn, and Cd content in the farmland soil and sediment around the lower reaches of the Hun River (HTM tailings pond section) are obviously higher than the upper reaches. The Igeo values show that the farmland soil near the outlet of the tailings pond is the most polluted area. Cu was classified as moderate–strongly pollution, Zn was moderately pollution, and Cd was strongly pollution. Cd is the major pollutant in farmland soil, the monomial ecological risk (Eri) for Cd is a very high potential ecological risk. The potential ecological risk of sediment in the dry season is more serious than in the raining season. In the dry season, the Igeo index shows strong pollution for Cu and Cd at the confluence of the Hun River and the tributary from the HTM tailings pond, and a moderate–strongly pollution for Zn. Whereas, the Eri index shows that the monomial ecological risk for Zn at H3 is low, and Cu is moderate. The potential ecological risk at H3 is high, and Cd is the main source of the ecological risk around the HTM tailings pond.

Section: Methodsmentioning

confidence: 99%

Pollution and Ecological Risk Evaluation of Heavy Metals in the Soil and Sediment around the HTM Tailings Pond, Northeastern China

Long

et al. 2020

IJERPH

Self Cite

“…The pH values obtained in soils with ENPs are diverse. Studies carried out on different soils with ENPs of Ag [ 10 ], phytogenic iron oxide [ 60 ], ZnO [ 61 ], CuO [ 52 ], Fe 3 O 4 [ 62 ], and ZnO and CuO [ 28 ] have shown a slight increase in pH values ( Table 1 ). Gao et al [ 52 ] used 10 mg kg −1 of CuO ENPs in sandy soil and determined that the pH ranged from 4.9 to 5, which is similar to the pH value of the control soil.…”

Section: Effect Of Enps On Soil Propertiesmentioning

confidence: 99%

“…As a result, ENPs can cause changes in the biological (e.g., mesofauna, macrofauna, and microbiota), physical (e.g., hydraulic conductivity, porosity, texture, bulk density, aggregation), and chemical (e.g., cation exchange capacity (CEC), electricity conductivity (EC), redox potential (Eh), pH, dissolved organic matter (DOM), and organic matter (OM) content) properties of the soil [ 16 , 20 , 23 , 24 , 25 ]. In fact, due to their small particle size, ENPs can interact with plant nutrients, like phosphorus (P), affecting their availability in the soil solution [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Impact on Some Soil Physical and Chemical Properties Caused by Metal and Metallic Oxide Engineered Nanoparticles: A Review

et al. 2023

In recent years, the release of metal and metallic oxide engineered nanoparticles (ENPs) into the environment has generated an increase in their accumulation in agricultural soils, which is a serious risk to the ecosystem and soil health. Here, we show the impact of ENPs on the physical and chemical properties of soils. A literature search was performed in the Scopus database using the keywords ENPs, plus soil physical properties or soil chemical properties, and elements availability. In general, we found that the presence of metal and metallic oxide ENPs in soils can increase hydraulic conductivity and soil porosity and reduce the distance between soil particles, as well as causing a variation in pH, cation exchange capacity (CEC), electrical conductivity (EC), redox potential (Eh), and soil organic matter (SOM) content. Furthermore, ENPs or the metal cations released from them in soils can interact with nutrients like phosphorus (P) forming complexes or precipitates, decreasing their bioavailability in the soil solution. The results depend on the soil properties and the doses, exposure duration, concentrations, and type of ENPs. Therefore, we suggest that particular attention should be paid to every kind of metal and metallic oxide ENPs deposited into the soil.

“…In in-situ passivation, there are various inorganic and organic materials used for remediation of heavy metal contaminated soils, including alkali substance [6], silicate [7], clay minerals [8], metallic oxide [9] and biochar [10]. The addition of alkali substance to contaminated soils is an extremely regarded passivator that can increase soil pH, enhance precipitation of metal carbonates and hydroxide and reduce metals bioavailability [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Combined Passivators on Cadmium Availability in Contaminated Soils and Uptake by Pakchoi (<i>Brassica chinensis</i> L.)

Lai¹,

Wang²,

Lü³

et al. 2023

Pol. J. Environ. Stud.

To solve the problem of excessive heavy metals in farmland soil, there is a pressing need for research effort to screen for the soil passivator materials. The effects of combined passivators on cadmium (Cd) availability in soils and uptake by pakchoi have been investigated based on the passivator screening and pot experiment. The results indicated that sepiolite, calcined lime and polyacrylamide (PAM) could significantly decrease the available Cd content in soils among eight kinds of inorganic and organic passivators, which were declined by 28.64%, 40.06% and 74.55%, respectively. Therefore, sepiolite, calcined lime and PAM were identified as the components of the combined passivators to grow pakchoi. The pakchoi planting experiment results of combined passivators showed that the combination of "calcined lime+PAM+sepiolite" was the most effective in decreasing the available Cd content in soils, which can reduce it by 39.83% (P<0.05). Meanwhile, the increases in ratio of weak organic bound or iron and manganese oxidation fractions in soils were responsible for the transformation of soil available Cd to the more stabilized fraction after applying of combined passivators. The positive passivation responses of "calcined lime+PAM+sepiolite" for Cd transfer to the aboveground of pakchoi and "calcined lime+PAM" for Cd absorption by pakchoi root demonstrated that these combined passivators could reduce Cd uptake by pakchoi. Thus, application of combined passivator of "calcined lime+PAM+sepiolite" can effectively reduce the Cd availability and Cd uptake by pakchoi in this study. Based on the results of the present research would provide a useful reference to remediate Cd contaminated soils.