Lead was mobilized in acid silty clay loam paddy soil with potassium dihydrogen phosphate (KDP) amendment

Dual Regulatory Role of Penicillium oxalicum SL2 in Soil: Phosphorus Solubilization and Pb Stabilization

“…Compared with the CK treatment, the contents of HNO 3 -Pb and CaCl 2 -Pb in the P treatment decreased by about 10% and 30% respectively, while the content of EDTA-Pb was not significantly changed, indicating that only application Ca 3 (PO 4 ) 2 had limited effect on Pb availability but could reduce Pb migration. 48 However, the results of BCR extraction indicated that only application Ca 3 (PO 4 ) 2 may have the risk of Pb activation: the proportion of acid extractable Pb increased significantly on the 28th day, which may be related to our previous research finding that phosphorus application could promote the formation of Pb(OH) 2 . 48 The contents of HNO 3 -Pb, EDTA-Pb and CaCl 2 -Pb in S treatment were reduced by 20.1−22.8%, 17.9−29.9% and 53.1−66.7%, respectively.…”

“…48 However, the results of BCR extraction indicated that only application Ca 3 (PO 4 ) 2 may have the risk of Pb activation: the proportion of acid extractable Pb increased significantly on the 28th day, which may be related to our previous research finding that phosphorus application could promote the formation of Pb(OH) 2 . 48 The contents of HNO 3 -Pb, EDTA-Pb and CaCl 2 -Pb in S treatment were reduced by 20.1−22.8%, 17.9−29.9% and 53.1−66.7%, respectively. The transformation of Pb from acid extractable state and reducible state to oxidizable state was observed, and the content of oxalate was also significantly increased, indicating that Pb may be stabilized in the form of organic binding state such as Pb-oxalate, which was considered to be one of the main forms of PSF stabilized Pb in soil.…”

Effect of concentration of silica encapsulated ds-DNA colloidal microparticles on their transport through saturated porous media

“…Increasing k det and enhanced mobility of SiDNASi with increasing concentration could be attributed to electrostatic double layer repulson between the aqueous phase and deposited SiDNASi [39,42] and by developing a shadow zone downgradient of the deposited particles restricting the probability of subsequent colloidal deposition [40,69]. Release of weakly attached SiDNASi (deposited in secondary energy minimum or nanoscale surface asperities) could also be attributed to enhanced electrostatic colloid-collector repulsion or charge reversal of surface charge heterogeneities due to adsorption of phosphate onto both collector grains and colloid particles [16,88]. Another possible explanation of the concentration dependent changes in k att and η could be colloidal re-entrainment due to aqueous phase-solid phase inter-colloidal collision.…”

Enhanced Formation of 6PPD-Q during the Aging of Tire Wear Particles in Anaerobic Flooded Soils: The Role of Iron Reduction and Environmentally Persistent Free Radicals

“…The aging of TWPs in the soil is supposed to be driven by both abiotic and biotic pathways. For example, soil moisture has been identified as an important environmental factor for the aging of pollutants in soils 21 because different water managements might result in anaerobic and aerobic conditions, which further differentiate the transformation of pollutants. 22 Therefore, it can be hypothesized that the aging of TWPs under different water conditions might lead to distinct accumulation of 6PPD-Q in soils.…”