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2 years ago

A mixed response of heavy metals concentration in sediment

Heavy metal concentration in water is given in Table 3. Analogous to the findings in suspended matter, concentrations of most of the heavy metals were also relatively higher in stations with low salinity (particularly in RM and RI) compared to the high salinity and reference (CS) stations. Typically Al, Cd, Cr, Mn, Pb and Zn concentrations in the water were highest at the river BQ-123 and upper stream areas such as RM and RI. However, Ag concentration showed the highest value (0.030 μg/L) in PA, while most of estuarine locations and river mouths in upper Vitória Bay were below detectable limit. Likewise, concentrations of chlamydia Ni, Co and Fe in water were higher along Espírito Santo Bay ranging for Ni from 1.04 μg/L in RS to 4.53 μg/L in FS, for Co from 0.30 μg/L in RS to 1.10 μg/L in IF, and for Fe from 301.58 μg/L in RS to 874.42 μg/L in CP respectively. Cu concentration in water ranged from 3.11 μg/L in RI to 12.25 μg/L in FS, and was similar to As levels, which ranged from 2.46 μg/L in RI to 10.34 μg/L in CP, followed by 10.28 μg/L in FS.

2 years ago

An updated groundwater flow and transport model of the

The construction of an brachiopods open channel around the landfill to collect its leachate was also proposed by the activities of the launched project (Ideon, 2007, Metsur, 2005 and Ramboll, 2007). A vertical barrier consisting of compacted peat arranged into the loose deposits was designed to be built along the outer bank of the channel to restrict the spreading of contaminated water.
3.2. Capping of the landfill
3.3.

2 years ago

According to Fig dendrites cannot be seen in coatings

As SIESTA code employs NAOs, the program replaces some integrals in real space by sums in a finite three dimensional real space grid, using one single parameter to control the PD173074 cutoff of the grid [13], which refers to the fineness of the grid, and was converged for all the systems studied here, finding an appropriate value of 250 Ry with an energy shift of 0.01 eV. To sample the Brillouin zone, Monkhorst–Pack method [18] was used employing k-point meshes of 4 × 4 ×1 for the slab system. The supercell employed was tetragonal with x, y, z periodic boundary conditions. The Fe(1 0 0) surface was emulated by a p(2 × 2) 5-layer slab, with three bottom layers fixed and two top layers free to relax. To model the solid/vacuum interphase, a large unit cell vector in z direction was selected, so that the interaction between the system and their images became negligible. The vacuum region was 1.5 nm thick. The determination of the minimum energy path for the different reactions was undertaken using the Nudged Elastic Band (NEB) method [19] and [20] and the local minima were found through the conjugate gradient (CG) technique.

2 years ago

The quantification was performed by external calibration

Mean concentration of perfluoroalkyl substances (ng g− 1), total mass flux (TMF, g m− 2 d− 1), concentration of organic carbon (OC, % w/w) and grain size distribution (clay, silt and sand, % volume) in settling particles. Numbers in brackets show precision between 3 replicates (%RSD). Limits of detection and quantification (MLOD and MLOQ respectively) Pam3CSK4 also shown.SampleOpeningSamplingPFBAPFHxAPFOAPFNAPFOSTMFOCClaySiltSandDayDays(ng g− 1)(ng g− 1)(ng g− 1)(ng g− 1)(ng g− 1)g m− 2 d− 1(%)(%)(%)(%)CC300-116/12/11160.89 (9)4.86 (31)0.12 (13)< MLOQ< MLOD52.481.1833.965.90.3CC300-201/01/12150.85 (27)11.65 (10)< MLOD< MLOD1.33 (5)31.531.3133.765.60.8CC300-316/01/12161.65 (6)1.36 (13)< MLOD< MLOD< MLOQ24.151.4240.559.40.1CC300-401/02/12151.23 (15)1.10 (24)< MLOD< MLOQ0.99 (7)21.56nd15.522.961.6CC300-516/02/1214< MLOD< MLOQ< MLOD< MLOD6.15 (22)1.560.1312.526.161.4CC300-601/03/1215< MLOD0.89 (26)< MLOD< MLOD1.93 (1)1.530.8621.363.215.5CC300-716/03/1216< MLOD< MLOQ< MLOD< MLOD10.64 (13)0.341.9718.340.041.8CC300-801/04/12154.47 (11)4.24 (7)< MLOD< MLOD0.22 (10)9.491.1726.349.624.2CC300-916/04/1215< MLOD6.13 (18)< MLOD< MLOD1.87 (9)1.772.0838.159.62.3CC300-1001/05/1215< MLOD6.01 (14)< MLOD< MLOD< MLOQ6.261.9544.852.72.5CC300-1116/05/12161.80 (2)2.46 (35)< MLOD< MLOD0.22 (17)7.291.8243.954.12.1CC300-1201/06/1215< MLOD3.76 (29)< MLOD0.38 (19)0.52 (8)6.521.6244.054.11.9CC1000-116/12/11160.90 (13)10.66 (12)0.13 (30)< MLOD< MLOD6.291.4139.659.21.2CC1000-201/01/12154.95 (18)4.57 (9)0.14 (25)< MLOQ0.28 (24)2.722.1545.454.20.4CC1000-316/01/12161.26 (30)10.44 (21)0.17 (18)< MLOD< MLOD3.641.8243.256.20.6CC1000-401/02/12151.56 (28)8.57 (16)< MLOD< MLOD< MLOD68.161.2827.065.08.0CC1000-516/02/1214< MLOD6.64 (28)0.10 (1)0.37 (18)< MLOD27.900.8932.159.48.5MLOD0.0040.0040.0020.0030.002MLOQ0.0120.0130.0070.0100.006nd: not determined due to the presence of fish remains cuticle would have biased the results.MLOD and MLOQ were calculated based on the results from beach sand spiked with the mix of PFASs at 15 ng kg− 1 and according to equations given in Section 2.3.3.Full-size tableTable optionsView in workspaceDownload as CSV

2 years ago

In this work in order to describe this phenomenon

The schematic diagram of the experimental system Cilengitide shown in Fig. 1. The system consisted of simulated flue gas, a photocatalytic reactor and a mercury analyzer. The N2 was divided into two branches, whose flow rates were controlled by two mass flow meters (MFC, CS200 type) separately. The total flow of the two branches was 1.2 L/min. One gas stream with a flow rate of 0.2 L/min passed through the Hg0 permeation tube to introduce Hg0 vapor into the system. The Hg0 inlet concentration was around 65 μg/m3. The mercury permeation tube was placed in a U-shape glass tube which was immersed in a constant 55 °C water bath to ensure a constant Hg0 permeation rate. The other stream of N2 had a flow rate of 1 L/min. An on-line mercury analyzer (VM3000 mercury vapor monitor, Mercury Instruments, Germany) based on atomic absorption spectrometry was used to measure the gas phase concentration of Hg0. The gas flowed through two silica gel columns before entering the mercury analyzer to remove water vapor. Finally, the gas got through the active carbon bottle and vented out of the system.

2 years ago

Catalytic test Ethanol conversion hydrogen selectivity and C containing

Catalytic test
Ethanol conversion, hydrogen selectivity and C-containing gas products selectivities were calculated as follow:equation(2)XEtOH(%)=FEtOH, in−FEtOH, outFEtOH, in×100equation(3)SH2(%)=16×moles(H2)producedmoles(EtOH)feed×XEtOH×100equation(4)Sj(%)=(%j)×i∑??((%j)×i)×100where j represents the carbon containing Lumacaftor in the products, including CH4, CO, CO2, C2H4, C2H6, CH3CHO and CH3COCH3, and i is the number of carbon atoms in the carbon containing species.

2 years ago

The effects of biomass composition and preparation method on catalyst

Generally, the S2p photoelectron peak (163–168 eV) is of particular significance in the sulfonated materials and has been used to confirm the presence of SO3H groups [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19] and [20]. Here, XPS surface analysis also revealed the effects of preparation method on catalyst surface structure. In this work, the AC sulfonated by radical method (method 1) exhibited only a single S peak at 168 eV, assigned to the surface bound SO3H groups, while those prepared by conc.