Overview
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Key numbers
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- and zinc (Zn) in typical mining soils. Soil samples were amended with 1%, 2%, and 3%
- transformation, and microbial community responses. At 50 days, the 1% UiO-66-NH2
- treatment reduced the leaching concentrations of V, Cr, Ni, and Zn by 90.42%, 59.72%,
- 90.12%, and 90.71%, respectively. Although Cr showed its highest reduction efficiency
- under the 3% treatment, the 1% dosage provided a practical compromise for multi-metal
- that a 1% UiO-66-NH2 amendment provides a robust and ecologically compatible strategy
- multi-metal contamination dominated by V and Cr (Table S1).
- and amended with UiO-66-NH2 at 1%, 2%, and 3% based on dry soil weight. The untreated
- at 72 ◦ C. The resulting amplicons were verified via 2% agarose gel electrophoresis, pu-
- were clustered into operational taxonomic units (OTUs) at a 97% similarity threshold via
- 0.177, and 1.624 mg/kg, respectively (Tables S3–S6). These values represent the time-
- At addition rates of 1–3%, the leaching concentration decreases sharply from 4.645 mg/kg
- to 0.328–0.345 mg/kg within 10 days, with the passivation efficiency exceeding 92%. How-
- systematically (0.445–0.554 mg/kg), and the efficiency decreased to 88–90% (Tables S7–S10).
- leaching concentration decreased as the addition amount increased. At 1% addition, the
- concentration decreased from 0.0435 mg/kg to 0.0175 mg/kg within 30 days, achieving
- an efficiency of 59.12%, but by 50 days, the efficiency increased only slightly to 59.72%. At
- 3% addition, the concentration sharply decreased to 0.0062 mg/kg, with an efficiency of
- 75.31%, and the efficiency increased to 85.71% at 50 days. These results indicate that Cr
- reduction efficiency was obtained under the 3% treatment rather than the 1% treatment.
- stabilization at 1–2% addition. The Ni leaching concentration decreased from 0.1771 mg/kg
- to 0.0174–0.0202 mg/kg within 40 days, with an efficiency of 88–90% at 50 days, whereas
- the 1% dosage, the leaching concentration decreased from 1.201 mg/kg to 0.151 mg/kg,
- decreased to 80–87%, with the 2% treatment showed higher leaching concentrations than
- In the untreated soil, V was mainly present in the residual fraction (79.67%), with
- weakly acid-extractable (0.35%) and reducible (13.77%) fractions contributing to potential
- significantly increased: at a 1% addition, the weakly acid-extractable and reducible fractions
- decreased by 42.77% and 38.03%, respectively, within 50 days, whereas the residual fraction
- only slightly increased by 2.77%, and the oxidizable fraction sharply increased by 51.24%.
- fractions rather than residual fractions. At 2% addition, the weakly acid-extractable and
- reducible fractions decreased by 43.35% and 34.41%, respectively, while the oxidizable and
- residual fractions increased by 76.51% and 0.17%, respectively, further confirming that the
- acid-extractable fraction decreased by 49.50%, reaching a peak, but the residual fraction
- unexpectedly decreased by 1.79% to 78.24%, while the oxidizable fraction increases to
- 80.35%. This may be due to the excessive passivation agent forming soluble complexes with
- low, with the residual fraction accounting for as high as 96.78%. This indicates that
- highest inhibition rate of 85.71% was achieved after 50 days at a 3% application rate,
- application rates of 1% and 2%, the weak acid-extractable fraction decreased by 6.67–11.48%,
- the reducible fraction was drastically reduced by over 95%, and the oxidizable fraction
- increased significantly by 37.77–64.88%. This transformation from active fractions to the
- the high application rate of 3%, an anomalous increase of 2.05% was observed in the
- characteristics (Figure 4c,d). The original residual state of Ni accounts for 90.36%. At
Methods (brief)
- and zinc (Zn) in typical mining soils. Soil samples were amended with 1%, 2%, and 3%
- 2.1. Sample Collection and Analysis
- Heavy-metal-contaminated soil was collected from five sites at a depth of 0–20 cm in
- Huashan mine in Panzhihua city, Sichuan Province. After collection, the soil samples were
- ICP-AES results showed that the average concentrations of V, Cr, Ni, and Zn in the
- contaminated soil collected before UiO-66-NH2 addition was defined as the initial untreated
- baseline sample. This time-zero sample was used to characterize the initial leaching
- samples. Total genomic DNA was isolated from soil samples using the E.Z.N.A.® Soil
- lineages. With sample coverage exceeding 0.99, the sequencing depth captured most of
- samples identifies it as a potential indicator for UiO-66-NH2 amendment. These patterns
Implications
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Update history
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