Influence of alkyl polyglucoside, citric acid, and nitrilotriacetic acid on phytoremediation in pyrene-Pb co-contaminated soils

ABSTRACT

At present, the remediation for organic pollutants and heavy metals co-contaminated soils is a challenge which needs to be broken through. In this study, alkyl polyglucoside (APG), citric acid (CA), and nitrilotriacetic acid (NTA) were chosen to enhance the phytoremediation of pyrene and Pb co-contaminated soils by perennial ryegrass. Through the comparison of the results with different applications, it could be found that the application of NTA was beneficial to the growth of perennial ryegrass, the underground and aboveground biomass were increased by 172.9–236.1% and 61.9–142.8%, respectively, meanwhile, photosynthetic activity of perennial ryegrass was affected positively. More importantly, the combined application of APG and NTA maximally promoted the accumulation and translocation of Pb (BF/TF, 0.44/0.61) and dissipation of pyrene (71.6%). These results indicated that the combined application of APG and NTA could be promising for future practical application of phytoremediation. However, the optimal dosage ratio of APG and NTA for phytoremediation needs to be further researched.

KEYWORDS:

• APG
• CA
• NTA
• perennial ryegrass
• pyrene
• lead

Conflict of interest

The authors declare that they have no conflict of interest.

Acknowledgments

This work was funded by the National Natural Science Foundation of China (Nos.21677093, 41373097), Key Laboratory of Water Environment and Marine Biological Resources Protection of Zhejiang Province (No.KF201503).

Additional information

Funding

This work was supported by National Natural Science Foundation of China(21677093, 41373097), Shanghai Natural Science Foundation(18ZR1414100).