Effects of carbonate and organic matter on sorption and desorption behavior of polycyclic aromatic hydrocarbons in the sediments from Yangtze River

Wang, Lili; Niu, Junfeng; Zhang, Yang; Shen, Zhenyao; Wang, Jingyi

doi:10.1016/j.jhazmat.2007.10.096

Cited by 34 publications

(9 citation statements)

References 26 publications

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“…Sediments with different organic matter contents were prepared by mixing the raw sediments and the organic-removed sediments according to the given mixing ratios of 0:3, 1:2, 2:1 and 3:0, yielding sediments with organic matter contents of 0.33, 0.45, 0.56 and 0.68%, respectively. The organic matter was removed from original sediments using H 2 O 2 removal method previously described by Wang et al (2008b). After slow addition of 10 ml 30% H 2 O 2 solution, 20 g sediment sample was incubated at 40°C with intermittent agitation followed by evaporating to dryness.…”

Section: Sample Preparationmentioning

confidence: 99%

Ammonia adsorption and nitritation in sediments derived from the Three Gorges Reservoir, China

et al. 2009

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The influences of suspended particles (SPs) on NH 4? adsorption and nitritation occurring in the water system of the Three Gorges Reservoir (TGR) were evaluated in this study. The results indicated that the adsorption of NH 4 ? was significantly affected by the SPs concentration under the conditions typically present in the TGR. The amount of ammonia adsorbed per unit weight of suspended particles was inverse proportional to the concentration of suspended particles. However, the influences of the particle size and the organic matter concentration existing in SPs were insignificant under the experimental conditions. The effects of suspended particles on nitritation were determined by the use of ammonia-oxidizing bacteria (AOB) strain SW16, identified as Nitrosomonas nitrosa, which was isolated from sediment samples of the TGR. Suspended particle concentration in water-sediment solution played an important role in the nitritation process. The rate of nitritation enhanced with the increase of the suspended particle concentration. It was found that the critical factor controlling ammonia oxidizing rate was the AOB biomass resulting from the AOB growth rate. Moreover, results demonstrated that both particle size and organic matter content showed little effect on the nitritation process under the experimental conditions.

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Section: Sample Preparationmentioning

confidence: 99%

Ammonia adsorption and nitritation in sediments derived from the Three Gorges Reservoir, China

et al. 2009

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“…SPM samples as well as sediments were mixed with 30-mL hexane/acetone mixture (1:1, v/v) and left to settle overnight. The advanced PAH quantifying analysis was as demonstrated in our previous study (Wang et al 2008). …”

Section: Methodsmentioning

confidence: 90%

“…Prediction models were accordingly developed, and the differences between measured and predicted values were supposed to be due to the presence of other active sorbents in sediment (Feng et al 2007b;Latimer et al 1999). However, as sediment is a multi-component mixture, its sorption mechanisms cannot be distinctly determined by a single partition hypothesis (van der Heijden and Jonker 2009; Wang et al 2008). In addition, under hydrodynamic conditions, particle collisions occurring during remobilization altered the size and surface areas of the suspended solid (DePinto et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Simulation of polycyclic aromatic hydrocarbon remobilization in typical active regions of river system under hydrodynamic conditions

Wang

Zhang

2010

J Soils Sediments

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Purpose In an aquatic environment, hydrodynamic condition is a ubiquitous natural process, and the contaminated sediments will act as a potential pollution source once they are remobilized into the overlying water. In this study, remobilization behavior of polycyclic aromatic hydrocarbons (PAHs) under simulated hydrodynamic conditions was studied. Additionally, an adjusted prediction model with addictive consideration of surface properties was developed to exhibit the distribution of PAHs in hydrodynamic system. Materials and methods An improved syntonic turbulencesimulation device (TSD) was used to simulate hydrodynamic conditions. Two sediments from the Yellow River Delta (YRD) and the intersection of Yangtze and Hanjiang River (YHR), respectively, were used to represent variations in organic carbon contents and sediment surface characteristics. Five PAHs including acenaphthene (Ace), fluorine (Flu), phenanthrene (Phe), fluoranthene (Fla), and pyrene (Pyr) were selected as the target compounds in this study. Results and discussion ∑PAH concentrations in particles on volume normalization increased 74.1% and 18.5% for the YRD and YHR samples, respectively, and the same increasing trend was observed for individual PAHs. On mass weight basis, ∑PAHs were observed to decrease for both the YRD (from 2,039.5 to 1,149.7 ngg −1 ) and YHR (4,222.7 ngg −1 to 2,914.2 ngg −1 ) samples. Interestingly, concerning the different heights of the TSD, the YRD-associated PAHs showed an opposite behavior comparing with the YHR-bound PAHs. Conclusions The remobilization of less contaminated, larger-size particles was found to skew the PAH concentration downward, which resulted in the opposite PAH behaviors of the YRD and YHR samples. The distribution of PAHs between solid and liquid phases was affected by both organic carbon contents and surface areas of the remobilized sediments.

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“…Comparing the sorption isotherms of PHE from S0 to S2 and judging from the slight decrease of K d value, carbonate played a minor role in the sorption, despite its dominant content in the limestone. A previous work with different results was done on river sediments by Wang et al (2008) indicating that the sample was remarkably aggregated and came to exist with amorphous state after the removal of carbonate and that carbonate provided sorption sites in the PHE sorption process and thus the sorption mass decreased after removing carbonate in sediment samples.…”

Section: Factors Affecting Phe Sorption On Limestonementioning

confidence: 96%

Kinetics and Controlling Factors of Phenanthrene Adsorption on Limestone

Shao¹,

Wang²,

Kong³

et al. 2014

Environmental Engineering Science

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Sorption kinetics and controlling factors of phenanthrene (PHE) adsorption on limestone were obtained by batch experiments. A pseudo-first-order equation fit well with the experimental data. Roles of carbonate and organic matter in the adsorption process of PHE were studied by using a sequential separation procedure. It was discovered that organic matter remarkably affected the behavior of PHE in the adsorption procedure, and carbonate slightly affected the adsorption process due to its influence on physical characteristics of limestone. Different pH conditions led to precipitation and dissolution of carbonate and dissociation of limestone hydroxyl groups, which affected adsorption capacity. In the presence of low ionic strength, calcium ions would occupy some adsorption sites, leading to a decrease in PHE adsorption. By contrast, standard free energy (DG 0 ) became more negative when the concentration of CaCl 2 increased from 0.005 to 0.1 M, which was consistent with the amount of adsorption increase. The influence of humic acids (HA) was also investigated. There was competitive adsorption between PHE and HA. The affinity of HA for limestone was stronger than that of PHE, which when adsorbed on limestone could be desorbed by HA added later. Finally, the coexistence of PHE and acenaphthylene indicated that there was a competitive adsorption between them, although it was easier for PHE to be adsorbed on limestone.

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Effects of carbonate and organic matter on sorption and desorption behavior of polycyclic aromatic hydrocarbons in the sediments from Yangtze River

Cited by 34 publications

References 26 publications

Ammonia adsorption and nitritation in sediments derived from the Three Gorges Reservoir, China

Ammonia adsorption and nitritation in sediments derived from the Three Gorges Reservoir, China

Simulation of polycyclic aromatic hydrocarbon remobilization in typical active regions of river system under hydrodynamic conditions

Kinetics and Controlling Factors of Phenanthrene Adsorption on Limestone

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