NTA-enhanced Pb remediation efficiency by the phytostabilizer Athyrium wardii (Hook.) and associated Pb leaching risk
| Autor: | Juan Zhan, Haiying Yu, Xizhou Zhang, Tingxuan Li, Yongdong Wang, Huagang Huang, Zhang Qingpei |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nitrilotriacetic Acid
Environmental Engineering Environmental remediation Health Toxicology and Mutagenesis 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences 01 natural sciences Plant Roots chemistry.chemical_compound Soil Environmental Chemistry Soil Pollutants Leachate Biomass 0105 earth and related environmental sciences Public Health Environmental and Occupational Health Nitrilotriacetic acid General Medicine General Chemistry Pollution 020801 environmental engineering Phytoremediation Tracheophyta Biodegradation Environmental chemistry Column experiment Lead Environmental chemistry Athyrium wardii Soil water Leaching (metallurgy) |
| Zdroj: | Chemosphere. 246 |
| ISSN: | 1879-1298 |
| Popis: | Nitrilotriacetic acid (NTA), a biodegradable chelant, has been promoted to effectively assist Pb phytoextraction, while a few researches available on the phytostabilizer of Athyrium wardii (Hook.). In this study, two incubation experiments and a subsequent column experiment were conducted to investigate the effects of application of NTA on Pb availability in soils and Pb accumulation in A. wardii and associated leaching risk. The application of NTA significantly increased the exchangeable Pb and Pb bound to carbonates along with a decreased pH, leading to enhanced Pb availability in soils. It was more effective in enhancing Pb availability in soils by adding 2 mmol kg−1 NTA into soils at once for 7 d, thus demonstrating potential for enhancing Pb uptake by A. wardii. After the addition of 2 mmol kg−1 NTA for 7 d, Pb concentrations in roots of A. wardii was enhanced by 23.8%, along with 10.6% of increase for Pb accumulation in roots. No significant changes were observed for the biomass of A. wardii. Meanwhile, the available Pb and TCLP-extractable Pb in 0–20 cm soils increased by 11.1–23.4% and 7.1–31.2%, thus promoting Pb leaching in 0–20 cm soils. However, there were no changes for Pb leaching risk levels of 20–40 cm soils. No Pb was detected in the leachates from all columns. The application of 2 mmol kg−1 NTA at once for 7 d is therefore proved to show greater potential in enhancing Pb remediation efficiency by the phytostabilizer of A. wardii without increasing Pb leaching risk into groundwater. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect