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The pollution of Jiaozhou Bay was investigated by measuring the trace elements of surface sediments. Sediment samples were collected at 33 locations in Jiaozhou Bay in November 2003. The large-scale distribution pattern of metals in surface sediments showed elevated levels of Cd, Cr, Cu, Pb, Hg compared with values obtained in 1989. Concentrations of soil-related elements such as Al, Fe, Mn did not...
Spatial distribution of metal concentrations in the surface sediment samples collected from 19 marine at Guanhe estuary in Haizhou Bay, Lianyungang was studied. Heavy metal (Cu, Zn, Pb, Cd, Cr, As, Ni, Mn) concentrations were determined and geo-accumulation index (Igeo) was calculated to understand the pollution status of the study area based on the background values. The ranges of the measured concentrations...
A three-layer artificial neural network (ANN) model was developed to predict the contributions of non-residual and residual components in surficial sediments (SSs) on atrazine (AT) adsorption based on 32 experimental sets obtained in a laboratory batch study, in which the inputs were selected as contents of Fe oxides, Mn oxides, organic materials (OMs), residual component and the initial concentrations...
This paper aims to optimize dispersive liquid-liquid microextraction based on the solidification of floating organic drop coupled with ultrasonic-assisted extraction (UAE-DLLME-SFO) of brominated diphenyl ether (BDE-209) in surficial sediment samples through genetic algorithm neural network (GANN) model and high-performance liquid chromatography (HPLC). A GANN model was established based on the orthogonalized...
Based on the data of single atrazine (AT) adsorption, co-sorption of AT and cadmium (Cd), and co-sorption of AT and malathion (Ma) onto surficial sediments (SSs), a BP artificial neural network (ANN) model was established, in which the inputs were selected as concentrations of AT, Cd, Ma and the output was the amount of AT adsorption onto SSs, in order to simulate the interaction of co-existed Ma...
The impacts of several factors (extractant volume, dispersant volume, extractant type, dispersant type, pH, salt effect, extraction time and grain size) on dispersive liquid-liquid microextraction-solidification of floating organic drop of DecaBDE from river sediments based on undecanol were investigated by an interactive orthogonal experimental array design, and the significant factors were obtained...
The distribution, profile, sources, and impacts of polycyclic aromatic hydrocarbon (PAHs) in oilfield soils were investigated. The concentrations and distribution of PAHs in soils from five sites (named as S1, S2, S3, S4 and S5) showed different levels of PAHs. The concentrations of total PAHs in the soils ranged from 1340 to 82393 ng/g. The profiles of different number of aromatic rings in each of...
The adsorption, desorption and species distribution characteristics of Cu and Zn in the sediments with or without montmorillonite spiked were investigated by isothermal adsorption and sequential extraction procedure. The results show that the montmorillonite spiked in the sediments enhanced the adsorption capacity of sediments for Cu and Zn and facilitated the transformation of Cu and Zn from less...
Surfactants have a significant influence on the adsorption of organic contaminants. In this study, batch equilibrium experiments were conducted to investigate the influences of cationic surfactant cetyltrimethylammonium bromide (CTMAB), anionic surfactant sodium dodecylbenzenesulfonate (SDBS) and non-ionic surfactant Triton X-100 (TX100) on bisphenol A (BPA) adsorption onto surficial sediments (SSs)...
The effects of pH andEh on release of nitrogen and phosphorus from sediments of West Lake under different conditions were investigated by simulation test. Results showed that the net flux of NH4+-N release from sediments increased with pH, but NO3−-N showed negative-going release at all tested pH levels. The net flux of NH4+-N release from sediments was higher under...
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