TY - JOUR
T1 - Assessing simultaneous immobilization of lead and improvement of phosphorus availability through application of phosphorus-rich biochar in a contaminated soil
T2 - A pot experiment
AU - Chen, Hanbo
AU - Feng, Ying
AU - Yang, Xing
AU - Yang, Bingshuang
AU - Sarkar, Binoy
AU - Bolan, Nanthi
AU - Meng, Jun
AU - Wu, Fengchang
AU - WONG, Jonathan W. C.
AU - Chen, Wenfu
AU - Wang, Hailong
N1 - Funding Information:
This study was funded by the National Natural Science Foundation of China ( 21876027 ), the Key Scientific and Technological Project of Foshan City , China ( 2120001008392 ), and the Special Fund for the Science and Technology Innovation Team of Foshan, China ( 1920001000083 ).
Publisher Copyright:
© 2022 Elsevier Ltd.
PY - 2022/6
Y1 - 2022/6
N2 - Soil lead (Pb) contamination is often caused by anthropogenic activities. In this study, a pot experiment was conducted to assess the effect of biochars derived from pig-carcass (PCBC) and branches of oriental-plane tree (OPBC) on the bioavailability, redistribution, and phytoavailability of Pb and P, as well as the growth of Ipomoea aquatica Forsk in a Pb-contaminated soil. Application of PCBC increased the total and available P concentrations in the soil as compared to the control, and enhanced the concentrations of labile P and sparingly labile P via direct exogenous P input and improvement of soil pH. Both biochars facilitated P accumulation in plant shoots and roots. Sequential extraction of soil Pb confirmed that biochar application facilitated the transformation of mobile Pb into stable fractions, with greater effects from PCBC than OPBC. Hence, biochar application significantly decreased the soil DTPA-extractable Pb by 90.2% (PCBC) and 64.0% (OPBC) compared to the control, consequently reducing Pb uptake by plants. The Pb immobilization by biochar was driven by the biochar-induced increase of soil pH, Pb-phosphate/carbonate precipitation, ion exchange between Pb2+ and biochar-derived cations (e.g., Ca2+ and K+), and surface complexation with functional groups (e.g., carboxyl, hydroxyl, C[dbnd]O). Application of PCBC simultaneously increased the biomass of plant roots and shoots, by 1.8- and 0.6- folds, respectively. Overall, PCBC showed a potential to function as an effective amendment in the immobilization of Pb and alternative P fertilizer to improve degraded soils.
AB - Soil lead (Pb) contamination is often caused by anthropogenic activities. In this study, a pot experiment was conducted to assess the effect of biochars derived from pig-carcass (PCBC) and branches of oriental-plane tree (OPBC) on the bioavailability, redistribution, and phytoavailability of Pb and P, as well as the growth of Ipomoea aquatica Forsk in a Pb-contaminated soil. Application of PCBC increased the total and available P concentrations in the soil as compared to the control, and enhanced the concentrations of labile P and sparingly labile P via direct exogenous P input and improvement of soil pH. Both biochars facilitated P accumulation in plant shoots and roots. Sequential extraction of soil Pb confirmed that biochar application facilitated the transformation of mobile Pb into stable fractions, with greater effects from PCBC than OPBC. Hence, biochar application significantly decreased the soil DTPA-extractable Pb by 90.2% (PCBC) and 64.0% (OPBC) compared to the control, consequently reducing Pb uptake by plants. The Pb immobilization by biochar was driven by the biochar-induced increase of soil pH, Pb-phosphate/carbonate precipitation, ion exchange between Pb2+ and biochar-derived cations (e.g., Ca2+ and K+), and surface complexation with functional groups (e.g., carboxyl, hydroxyl, C[dbnd]O). Application of PCBC simultaneously increased the biomass of plant roots and shoots, by 1.8- and 0.6- folds, respectively. Overall, PCBC showed a potential to function as an effective amendment in the immobilization of Pb and alternative P fertilizer to improve degraded soils.
KW - Alternative fertilizer
KW - Bioavailability
KW - Heavy metal
KW - Sequential extraction
KW - Soil remediation
UR - http://www.scopus.com/inward/record.url?scp=85124589683&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2022.133891
DO - 10.1016/j.chemosphere.2022.133891
M3 - Journal article
SN - 0045-6535
VL - 296
JO - Chemosphere
JF - Chemosphere
M1 - 133891
ER -
