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1.
The adsorption of a cationic (CTAB, cetyl trimethylammonium bromide) and an anionic surfactant (SLES, sodium dodecylethersulfate)
from aqueous solution onto organic polymer resin (Lewatit VPOC 1064 MD PH) was studied. A series of batch experiments were
performed to determine the sorption isotherms of surfactants to organic polymer resin. The experimental studies were analyzed
by Langmuir and Freundlich isotherms. Furthermore, the isotherm parameters, average percentage errors (ε) of model data, and
separation factor (R
L) were calculated. Other factors influencing the adsorption capacity (contact time, adsorbent amount, and initial surfactant
concentration) were also discussed. The experimental data fitted very well to the Langmuir equilibrium model in the studied
concentration range. The calculated R
L values showed that the adsorption of both surfactants were favorable. Among the surfactants, CTAB showed higher adsorption
capacity onto organic polymer resin compared to SLES (Q
0 = 250 and 34.36 mg g−1, respectively). 相似文献
2.
Water samples from 20 locations on rivers in the Tongzhou District of Beijing were collected four times from July 2005 to
March 2006. In addition, sediment samples were collected in July 2005. All samples were analyzed for 16 US Environmental Protection
Agency (EPA) priority pollutants polycyclic aromatic hydrocarbons (PAHs). The concentration, distribution, seasonal variation,
and sources of the 16 PAH compounds identified in the water samples, suspended particles, and surface sediments were then
evaluated. The concentrations of PAHs in the water and suspended particle and surface sediment samples ranged from 87.3 to
1,890 ng l−1, 1,330 to 27,700 ng g−1, and 156 to 8,650 ng g−1, respectively. These results demonstrated that rivers in the Tongzhou District of Beijing had a high level of PAH pollution,
especially in the suspended particles. The highest and lowest concentrations of PAHs in the water samples were observed in
summer and spring. However, the seasonal variations in the concentration of PAHs in the suspended particles were more complicated.
The dominant compounds in the water, suspended particle, and surface sediment samples were two-, three- and four-ring PAH
compounds, respectively. Ratio analysis illustrated that fuel-burning was the primary source of PAHs in the study area. Gasoline,
diesel, coal, and coke oven sources were identified and the contributions of the different fuel-burning sources were then
calculated using factor analysis and multiple linear regression. These analyses revealed that coal combustion, gasoline combustion
plus coke oven emission, and diesel combustion accounted for 38.8%, 38.5%, and 22.7% of the PAHs in suspended particles, respectively. 相似文献
3.
Patricia Miretzky Carolina Mu?oz Enrique Cantoral-Uriza 《Environmental Chemistry Letters》2011,9(1):55-63
Naturally occurring diatomaceous earth was modified by alkaline pretreatment, and its effectiveness for Cd2+ removal from contaminated water was investigated. Batch experiments were carried out to determine Cd2+ adsorption capacity and the efficiency of the sorption process under different experimental conditions. Experimental data
showed good fitting to Langmuir and Freundlich isotherms models. The Cd2+ maximum adsorption capacity was 0.058 mmol g−1 for raw diatomite and increased to 0.195 mmol g−1 for alkaline-pretreated diatomite with efficiency higher than 96% (diatomite dose 2.5 g L−1, pH 6). Adsorption of Cd2+ to alkaline-pretreated diatomite increased as the temperature increased. Thermodynamic parameters were calculated to evaluate
the feasibility of the adsorption process at different temperatures. The adsorption process was spontaneous and endothermic.
The interaction between Cd2+ ions and diatomite surface was weak enough to be considered as physical sorption, confirmed by the low value of activation
energy. 相似文献
4.
M. J. Watts J. O’Reilly A. L. Marcilla R. A. Shaw N. I. Ward 《Environmental geochemistry and health》2010,32(6):479-490
A field method is reported for the speciation of arsenic in water samples that is simple, rapid, safe to use beyond laboratory
environments, and cost effective. The method utilises solid-phase extraction cartridges (SPE) in series for selective retention
of arsenic species, followed by elution and measurement of eluted fractions by inductively coupled plasma mass spectrometry
(ICP-MS) for “total” arsenic. The method is suitable for on-site separation and preservation of arsenic species from water.
Mean percentage accuracies (n = 25) for synthetic solutions of arsenite (AsIII), arsenate (AsV), monomethylarsonic acid (MA), and dimethylarsinic acid (DMA) containing 10 μg l−1 As, were 98, 101, 94, and 105%, respectively. Data are presented to demonstrate the effect of pH and competing anions on
the retention of the arsenic species. The cartridges were tested in the UK and Argentina at sites where arsenic was known
to be present in surface and groundwaters, respectively, at elevated concentrations and under challenging matrix conditions.
In Argentinean groundwater, 4–20% of speciated arsenic was present as MA and 20–73% as AsIII. In UK surface waters, speciated arsenic was measured as 7–49% MA and 12–42% DMA. Comparative data from the field method
using SPE cartridges and the laboratory method using liquid chromatography coupled to ICP-MS for all water samples provided
a correlation of greater than 0.999 for AsIII and DMA, 0.991 for MA, and 0.982 for AsV (P < 0.01). 相似文献
5.
Particle size distribution and pollutants in road-deposited sediments in different areas of Zhenjiang,China 总被引:2,自引:0,他引:2
An understanding of road-deposited sediment (RDS) characteristics on an impervious surface is essential to estimate pollutant
washoff characteristics and to minimise the impacts of pollutants on the water environment. A total of 62 RDS samples were
collected from four different land-use types (commercial, residential, intense traffic and riverside park) in Zhenjiang City,
China. The samples were fractionated into seven grain-size classes and analysed for particle size distribution and concentrations
of pollutants. The samples are found to consist predominantly of fine particles (60–80%, <250 μm). The maximum mean concentrations
of zinc, lead and copper were 686.93, 589.19 and 158.16 mg/kg, respectively, with the highest metal concentrations found in
samples from the intense traffic area. The maximum mean contents of organic matter (12.55%), nitrogen (6.31 mg/g) and phosphorus
(5.15 mg/g) were found in samples from the commercial area. The concentrations of heavy metals were highest in the smallest
particle size fraction analysed (63 μm). The organic matter and nitrogen content generally increased with decreasing particle
sizes in the <500-μm particle size range. The results also revealed that most of the total nitrogen (TN) is attached to the
finer sediments and that to effectively reduce TN loads in particulates, treatment facilities must be able to remove the finer
particles (down to 125 μm for TN). 相似文献
6.
In the present article, a simple, rapid, sensitive and economical method has been developed for the simultaneous separation
and preconcentration of the trace amounts of copper, nickel, cobalt and manganese in water samples by using modified XAD-4
resins. The sorption was quantitative in the pH range 6.0–9.0, whereas quantitative desorption occurred instantaneously with
5.0 mL of 2 M HNO3, and selected elements have been determined by using flame atomic absorption spectrometry. Dynamic ranges were 0.04–3.5,
0.1–6.0, 0.04–4.5 and 0.04–4.0 μg/mL for copper, nickel, cobalt and manganese, respectively. The detection limits were 9.2,
28.6, 12.3 and 5.7 ng/mL for Cu(II), Ni(II), Co(II) and Mn(II), respectively. The effects of the experimental parameters,
including the sample pH, eluent type, interference ions and breakthrough volume, were studied for separation and preconcentration
of Cu(II), Ni(II), Co(II) and Mn(II) ions. Determination of these ions in standard samples confirmed that the proposed method
has good accuracy. The proposed method was used for the determination of these ions in water samples. 相似文献
7.
Kitirote Wantala Suthipong Sthiannopkao Bang-orn Srinameb Nurak Grisdanurak Kyoung Woong Kim 《Environmental geochemistry and health》2010,32(4):261-266
Rice husk (RH) agro-waste was used as a raw material for synthesizing mesoporous molecular sieves, MCM-41. The Fe-MCM-41 was
prepared by the hydrothermal technique (HT), resulting in a higher surface area and crystallinity than when prepared under
ambient conditions. In addition, a hexagonal structure was clearly seen with hydrothermal technique (HT) preparation. The
adsorption of arsenate by HT-Fe-MCM-41 was investigated. The factors studied affecting arsenate adsorption capacity were ferric
content in MCM-41, contact time, pH of solution, and initial arsenate concentration. It was found that HT-Fe-MCM-41 at the
Si/Fe mole ratio of 10 gave the highest adsorption capacity. Arsenate adsorption reached equilibrium within 4 h. The adsorption
capacity of HT-Fe-MCM-41 (Si/Fe = 10) was affected by the initial pH value and the initial arsenate concentration. The adsorption
capacity was highest at pH 3 and decreased thereafter with increases in the pH of solution value. The Langmuir model fit the
arsenate adsorption isotherm well. The maximum adsorption capacity for arsenate was 1,111 μg g−1. 相似文献
8.
Adsorption of vanadate(V) from aqueous solution onto industrial solid ‘waste’ Fe(III)/Cr(III) hydroxide was investigated.
HCl treated Fe(III)/Cr(III) hydroxide was found to be more efficient for the removal of vanadate(V) compared to untreated
adsorbent. The adsorption follows second-order kinetics. Langmuir and Freundlich isotherms have been studied. The Langmuir
adsorption capacity (Q
0) of the treated and untreated adsorbents was found to be 11.43 and 4.67 mg g−1, respectively. Thermodynamic parameters showed that the adsorption process was spontaneous and endothermic in the temperature
range 32–60°C. Maximum adsorption was found at system pH 4.0. The adsorption mechanism was predominantly ion exchange. Effect
of other anions such as phosphate, selenite, molybdate, nitrate, chloride, and sulfate on adsorption of vanadium has been
examined. 相似文献
9.
A simple, sensitive, accurate, and selective method for determination of ultratrace levels of Co is modified. The method is
based on preconcentration of Co on the PAR-loaded Amberlite XAD-7 at pH 2.0 ± 0.2 for contact time as low as 45 min. The adsorbed
cobalt was eluted with concentrated nitric acid and measured by flame atomic absorption spectrometry. Recoveries up to 90%
were achieved. The optimized preconcentration method was applied to cobalt determination in natural mineral waters. The detection
limit was found to be 0.1 ng mL−1. The relative standard deviation was found to be 13% for 600 mL of 2.0 ng mL−1, for 10 replicate preconcentration procedures. Cobalt concentrations in the studied water samples were found to be in the
ranges of 0.5–3.5 ng mL−1. 相似文献
10.
Strong adsorption of DNA molecules on humic acids 总被引:1,自引:0,他引:1
Kazutoshi Saeki Yasutaka Ihyo Masao Sakai Takashi Kunito 《Environmental Chemistry Letters》2011,9(4):505-509
Analysing soil microbial communities is often hampered by DNA adsorption on soil organic compounds such as humic acids. However
the role of humic acids in DNA adsorption and stability in soils remains controversial. To characterize DNA–humic acid interactions,
we studied DNA adsorption on two commercially available humic acids and a soil humic acid extracted from an Andosol. Desorption
of the adsorbed DNA using 4 different solutions—distilled water, 0.1 M NaCl, 0.1 M sodium phosphate buffer (pH 6.0), and 1%
sodium dodecyl sulfate solution—was also studied to understand the mechanism of DNA adsorption on humic acids. Here, we show
that humic acids play an important role in DNA adsorption to soils. DNA molecules were adsorbed on the humic acids, with adsorption
increasing proportionally with the DNA concentrations in the solution. The adsorption on all humic acid samples was fitted
with Freundlich equation, and the parameters obtained from the equation indicated a high affinity between the humic acids
and DNA molecules. The total amount of DNA desorbed by the 4 solutions was less than 2% of the total DNA adsorbed on all the
humic acids. The results demonstrate that DNA molecules are able to bind strongly to humic acids by ligand binding, hydrophobic
interaction, aggregation, or precipitation. 相似文献
11.
Pistón M Silva J Pérez-Zambra R Dol I Knochen M 《Environmental geochemistry and health》2012,34(2):273-278
A multicommutated flow system was designed and evaluated for the determination of total arsenic and selenium by Hydride Generation
Atomic Absorption Spectrometry (HG-AAS). It was applied to the determination of arsenic and selenium in samples of natural
and drinking water. Detection limits were 0.46 and 0.08 μg l−1 for arsenic and selenium, respectively; sampling frequency was 120 samples h−1 for arsenic and 160 samples h−1 for selenium. Linear ranges found were 1.54–10 μg l−1 (R = 0.999) for arsenic and 0.27–27 μg l−1 (R = 0.999) for selenium. Accuracy was evaluated by spiking various water samples and using a reference material. Recoveries
were in the range 95–116%. Analytical precision (s
r
(%), n = 10) was 6% for both elements. Compared with the Standard Methods, APHA, 3114B manual method, the system consumes at least
10 times less sample per determination, and the quantities of acid and reducing agent used are significantly lower with a
reduction in the generation of pollutants and waste. As an additional advantage, the system is very fast, efficient and environmentally
friendly for monitoring total arsenic and selenium levels in waters. 相似文献
12.
This study was conducted in the summer season (May, 2007). The fluoride concentration along with other physico-chemical parameters
in ground water samples was determined in Marks Nagar of Unnao district, Uttar Pradesh (India), since it is the only source
of drinking water for the villagers. The fluoride concentration in the water varied from 0.8 to 13.9 mgl−1 with a mean of 4.02 mgl−1. The correlation analysis revealed that fluoride had a positive correlation with pH, CO3, HCO3, and sodium adsorption ratio (SAR), whereas a negative correlation with Ca and Mg was found. A soil profile was also dug
in the area to assess depth-wise fluoride content in the soil. The soil samples and underneath calcium carbonate (CaCO3) concretion were analyzed for fluoride content. The percent of soluble fluoride to total fluoride in the soil varied from
25.15 to 4.76% down the soil profile. The soluble fluoride was found to decrease with the increase in the clay content in
the soil. The total leachable fluoride in CaCO3 concretions was found to be 6.08%. It was inferred from this study that the soil and underneath layer of CaCO3 concretions may be the potential source of fluoride contamination in the shallow drinking water sources of the area. 相似文献
13.
The influence of ionic strength, index cations and competing anions on arsenate (AsV) adsorption–desorption kinetics was studied in an Alfisol soil. A flow-through reactor system similar to that developed by
Carski and Sparks (Soil Sci Soc Am J 49:1114–1116, 1985) was constructed for the experiments. Arsenate adsorption kinetics
for all the treatments were initially fast with 58–91% of AsV adsorbed in the first 15 min. Beyond 15 min, AsV adsorption continued at a slower rate for the observation period of the experiments. Changes in the solution composition
had differing effects on the cumulative amount of AsV adsorbed by the soil. Ionic strength and different index cations had little effect on the amount of AsV adsorbed, while the presence of phosphate decreased the amount of AsV adsorbed from 169 to 89 and 177 to 115 g AsV μg−1 in 0.03 M sodium nitrate and 0.01 M calcium nitrate, respectively. Considerably less AsV was desorbed than was adsorbed, with only between 2 to 17% of the adsorbed AsV desorbed. The presence of phosphate increased the amount of AsV desorbed by 17%, but other changes in the solution ionic strength or index cation had little effect on the amount of AsV desorbed. 相似文献
14.
Jasmin Shah M. Rasul Jan Farhat-un-nisa Shehzad Behisht Ara 《Environmental Chemistry Letters》2010,8(3):253-259
A simple spectrophotometric method was developed for determination of trifluralin in commercial formulation and food samples.
The method was based on the hydrolysis of trifluralin with sodium hydroxide to form 2,6-dinitro-4-trifluoromethylaniline.
The resultant aniline group was diazotized with nitrate in acidic media and the diazotized product was coupled with β-naphthol
to form red colored product having λmax 550 nm. The reaction conditions were optimized for hydrolysis as well as for the diazotization reaction. The Beer’s law was obeyed over the range of 0.2–17 μg mL−1 with molar absorptivity of 1.5 × 104 L mol−1 cm−1. The relative standard deviation was found to be 3.6%. A two level factorial design of 23 was used for optimization of all parameters. The influence of different factors and their interactions on the final azo dye
formation were also studied from these factorial designs. The method has been applied successfully for the analysis of commercial
formulations and agricultural samples. The recovery for the determination of trifluralin was found to be in the range 95–97%. 相似文献
15.
Adsorptive separation of phosphate oxyanion from aqueous solution using an inorganic adsorbent 总被引:2,自引:0,他引:2
Phosphate removal from aqueous solution was explored using granular ferric hydroxide (GFH) as an inorganic adsorbent. Adsorption,
desorption and kinetic studies were conducted on laboratory scale to evaluate the performance of GFH as an adsorbent for low
concentrations of phosphate solution. The effect of pH on adsorption was investigated, and phosphate uptake was shown to decrease
with an increase in solution pH, with maximum removal seen to occur at pH 3. The experimental data best fit the Temkin isotherm
at both pH 3 and 4. Uptake of phosphate by GFH follows second-order kinetics, with the small particle range (76–200 μm) removing
phosphate from the solution more rapidly than the larger particle range (710–850 μm). The kinetic results suggest that intra-particle
diffusion is an important factor in phosphate adsorption onto GFH. Thermodynamic parameters (ΔG°, ΔH°, ΔS°) were evaluated, and the results indicated that the adsorption process was endothermic and spontaneous. This study demonstrates
that GFH has potential to be used as a cost-effective adsorbent for phosphate removal from aqueous solution. 相似文献
16.
Environmental concerns have been raised that suspended solids in turbid water adversely affect human health, and that their
removal increases in the cost of water treatment. The Yongdam dam reservoir, located in the southwestern region of Korea,
is severely affected by inflowing turbid water after storms. In this study, soil samples were collected from 37 sites in the
Yongdam upstream basin to investigate mineralogical and environmental factors associated with the turbidity potential of soils
in water environments. Turbidity potential was estimated by measuring the turbidity of soil-suspension solutions after settling
for 24 h. The mineralogy of the soils was dominated by four minerals—quartz, microcline, albite, and muscovite—with lesser
amounts of hornblende, chlorite, kaolinite, illite, and mixed layer illite. The quartz content was the most variable of the
soil mineralogy among the collected samples. Principal-components analysis (PCA) was used to examine relationships between
turbidity potential and other soil properties. The variables considered in the PCA included turbidity potential, quartz content,
albite content, mean size of soil particles, clay content, clay mineral content, zeta potential, conductivity, and pH of the
soil-suspension solution. The first two components of the PCA explained 52% of the overall variation of the selected variables.
The first component was possibly explained by physical properties such as the size of the soil particles; the second was correlated
with chemical properties of the soils, for example dissolution and extent of weathering. Closer examination of the PCA results
revealed that the quartz content of the soils was negatively correlated with their turbidity potential. A linear correlation
(r = 0.63) was obtained between measured turbidity potential and that predicted using multiple regression analysis based on
the content of clay-sized particles, clay minerals, and quartz, and the conductivity of the soil-suspension solution. 相似文献
17.
Ravi Naidu Euan Smith S. M. Imamul Huq Gary Owens 《Environmental geochemistry and health》2009,31(Z1):61-68
The bioavailability of arsenic (As) in the soil environment is largely governed by its adsorption–desorption reactions with
soil constituents. We have investigated the sorption–desorption behaviour of As in four typical Bangladeshi soils subjected
to irrigation with As-contaminated groundwater. The total As content of soils (160 samples) from the Laksham district ranged
from <0.03 to approximately 43 mg kg−1. Despite the low total soil As content, the concentration of As in the pore water of soils freshly irrigated with As-contaminated
groundwater ranged from 0.01 to 0.1 mg l−1. However, when these soils were allowed to dry, the concentration of As released in the pore water decreased to undetectable
levels. Remoistening of soils to field moisture over a 10-day period resulted in a significant (up to 0.06 mg l−1) release of As in the pore water of soils containing >10 mg As kg−1 soil, indicating the potential availability of As. In soils containing <5 mg As kg−1, As was not detected in the pore water. A comparison of Bangladeshi soils with strongly weathered long-term As-contaminated
soils from Queensland, Australia showed a much greater release of As in water extracts from the Australian soils. However,
this was attributed to the much higher loading of As in these Australian soils. The correlation of pore water As with other
inorganic ions (P, S) showed a strongly significant (P < 0.001) relationship with P, although there was no significant relationship between As and other inorganic cations, such
as Fe and Mn. Batch sorption studies showed an appreciable capacity for both AsV and AsIII sorption, with AsV being retained in much greater concentrations than AsIII. 相似文献
18.
Manganese oxide coatings on sand particles within filtration beds from a water treatment plant in Grampian, Scotland were
examined to determine their control on metal mobility. This study first sought to characterise the oxides, notably their mineralogy
and metal content, to provide a foundation for studies on the adsorption of dissolved metals from the treated water by the
oxides. The oxides were examined by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and analysed by flame
atomic absorption spectrophotometry (AAS). These techniques showed the oxide coatings were amorphous but uniformly distributed
over each sand grain. The oxides were selectively removed from the sand grains prior to analysis by AAS using a hydroxylamine
hydrochloride selective leaching method. The compositional range of the extracts was 100–150 mg L−1 Mn; 30–55 mg L−1 Fe; 17–56 mg L−1 Ca; 4.6–7.0 mg L−1 Ni; 4.6–6.8 mg L−1 Zn and 1.3–5.7 mg L−1 Mg. When these results are expressed as mg of metal per mg of Mn, the metal content of the oxides is remarkably uniform:
0.25–0.37 mg Fe; 0.14–0.35 mg Ca; 0.035–0.042 mg Ni; 0.035–0.040 mg Zn; 0.01–0.04 mg Mg. The greatest metal concentrations
were consistently found in the upper 3 cm of the filtration bed, and these decrease with increasing depth. After the beds
are cleaned a more uniform distribution of metals occurs throughout the bed. The metals taken up by the manganese coating
are retained over a wide pH range with the exception of Ca and Mg which desorb to a significant extent. The percentage of
calcium and magnesium lost from the coating ranges from 30–94%, the amount being dependent on the final pH of the solution.
The presence of manganese oxide in the filtration beds appears to be advantageous in terms of removal of transition metals
from the treated water. 相似文献
19.
Virginia E. Villafañe Paul J. Janknegt Marco de Graaff Ronald J. W. Visser Willem H. van de Poll Anita G. J. Buma E. Walter Helbling 《Marine Biology》2008,154(6):1021-1029
During austral summer 2006, experiments were carried out to evaluate the effects of ultraviolet radiation (UVR, 280–400 nm)
on carbon fixation of natural phytoplankton assemblages from Patagonia (Argentina). Surface water samples were collected (ca.
100 m offshore) at mid morning using an acid-cleaned (1 N HCl) dark container. The short-term impact of UVR (measured as radiocarbon
incorporation) was immediately assessed by exposing samples to three artificial illumination treatments: PAR (400–700 nm),
PAR + UV-A (320–700 nm), and PAR + UV-A + UV-B (280–700 nm). Pico-nanoplankton characterized the assemblages, and taxon-specific
pigment fingerprinting combined with CHEMTAX and supplemented with microscopic observations showed varied proportions of diatoms,
chlorophytes, and cyanobacteria throughout January–February 2006. Photosynthetic efficiency, as assessed through assimilation
numbers, was high [between 4.4 and 10.4 μg C (μg chl-a)−1 h−1], and it was probably favored by the supply of inorganic nutrients from the Chubut River. UVR-induced photoinhibition appeared
to be related to the taxonomic composition: in general, higher photoinhibition was observed when diatoms dominated, whereas
this was lower when samples were dominated by chlorophytes. Our data suggest that xanthophyll pigments might have provided
only limited protection in these already highlighted acclimated assemblages. 相似文献
20.
Residues of fluoroquinolones in marine aquaculture environment of the Pearl River Delta, South China 总被引:4,自引:0,他引:4
He X Wang Z Nie X Yang Y Pan D Leung AO Cheng Z Yang Y Li K Chen K 《Environmental geochemistry and health》2012,34(3):323-335
Concentrations and distributions of selected fluoroquinolones (norfloxacin, ciprofloxacin and enrofloxacin) in water, sediments
and nine kinds of fish species collected from 6 sites in two marine aquaculture regions of the Pearl River Delta, China, were
analyzed by using high-performance liquid chromatography with fluorescence detector (HPLC). The results showed that the concentrations
of ciprofloxacin and enrofloxacin were below the limits of quantification (LOQ) in all water samples except for norfloxacin.
Norfloxacin and ciprofloxacin concentrations ranged from 1.88 to 11.20 ng g−1 dry wt, 0.76–2.42 ng g−1 dry wt in sediments collected from the Dapeng’ao region (sites 1–3) and ranged from 2.31 to 4.75 ng g−1 dry wt, 1.26–1.76 ng g−1 dry wt in sediments collected from the Hailing Island region (sites 4–6), respectively. However, no enrofloxacin was found
in all sediment samples. The three fluoroquinolones (FQs) were detected in all fish samples, and the concentrations were higher
in liver tissues than those in muscle tissues. The levels of norfloxacin were higher than ciprofloxacin and enrofloxacin in
both liver and muscle tissues. Among the nine marine fish species, Siganus fuscescens from Hailing Island had a significantly high level of norfloxacin in liver tissue (254.58 ng g−1 wet wt), followed by Sparus macrocephalus (133.15 ng g−1 wet wt) from Dapeng’ao, and the lowest value was Lutianus argentimaculatus (5.18 ng g−1 wet wt) from Hailing Island. The obtained results of FQs in present study do not represent a risk to the human health in
Guangdong coastal area, based on the maximum residue limits (MRLs) established by Chinese Government and the acceptable daily
intake (ADI) recommended by the Food and Agriculture Organization and World Health Organization (FAO/WHO). 相似文献