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1.
The Contamination Levels of Organochlorine Pesticides in Water and Sediment Samples in Uluabat Lake, Turkey 总被引:3,自引:0,他引:3
The Uluabat Lake is a reservoir of 125 km2 surface area, in the boundaries of Bursa province, Turkey. The results showed that Uluabat Lake was still contaminated by
organochlorine pesticides and their residues despite the existence of bans over a long time. Considerable amounts of organochlorine
pesticides (HCB, p.p′-DDT, p.p′- DDE, α -, β- and γ-BHC, Aldrin, Heptachlor epoxide, Endrin, Endosulfan I and II) were detected in water and sediment samples during one-year
study in this lake. Samples of water and sediment were collected in different regions, (6 sampling point) of the lake between
February 2002 and November 2002.The mean levels of organochlorine pesticides in water and sediments were determined. According
to results, it was found that various environs in Uluabat Lake were contaminated by 11 different organochlorine pesticides.
Residue analyses showed that higher organochlorine pesticides and their residues were generally more accumulated in the sediment
samples. 相似文献
2.
Wang H He M Lin C Quan X Guo W Yang Z 《Environmental monitoring and assessment》2007,133(1-3):231-242
Surface sediment samples from 12 sites of the three selected rivers in Daliaohe River watershed (Hunhe River, Taizihe River
and Daliaohe River) were analyzed with the objective of establishing sources and hazard of the organochlorinae pesticides
(OCPs) and polychlorinated biphenyl (PCBs) in surface sediments. The total concentrations of OCPs varied from 3.06 to 23.24
ng g−1. ∑HCH (α-HCH, β-HCH, δ-HCH, γ-HCH), ∑DDT (p, p′-DDE, p, p′-DDD, o, p′-DDT, p, p′-DDT) and ∑Cyclodiene (Heptachlor, Aldrin,
Heptachlor epoxide, Dieldrin, Endrin) ranged from 1.86 to 21.48, 0.5 to 2.81 and 0.56 to 1.53 ng g−1, respectively. Results of OCPs also illustrate that the most dominant pollutants among the OCPs was ∑HCH, and γ-HCH was the
most dominant isomer in HCH, which was evidence of recent input of lindane. It possibly came from the runoff of polluted soils
and long-scale transportation. Total PCB concentrations ranged between 1.88 and 16.88 ng g−1. The peak concentrations of PCBs were found in sediments from station T5 and D3, which are in the vicinity of industrial
areas and ferry, respectively. These data show a moderate level of OCPs and PCBs contaminations compared to that in other
countries. 相似文献
3.
Recent biological inventory data shows severe declines in freshwater mussel abundance and biodiversity in the Conasauga River
Basin in Northwest Georgia, USA. Based on assessments of habitat conditions, mussel populations should be sustainable. We
conducted a study of sediment and water quality to evaluate the impact of anthropogenic contamination on mussel populations.
Permeable membrane devices (PMD), polar organic chemical integrative samplers (POCIS™), conventional water and sediment quality
analyses, and stable nitrogen isotope ratio analyses (δ15N) of snails and sediments were used to assess sediment and water quality at target sites throughout the basin. Ambient concentrations
of organic contaminants in water were well below any aquatic life criteria; concentrations of some nutrients were detected
above aquatic life criteria levels. Most mussel species in the river are endangered or threatened; therefore, snails were
collected for δ15N analyses. Mean δ15N values for snails collected at forested upper watershed sites (national forest areas) were significantly lower than δ15N values from snails in agricultural areas. δ15N values for raw cow manure and manure-treated soil were similar to δ15N values for snails collected in agricultural areas. Dissolved nitrate from water samples had elevated δ15N values similar to the upper range of δ15N values for snails in agricultural areas. Data, particularly stable nitrogen isotope data, indicates that a land use change
from national forest land to agriculture alters nitrogen sources to the basin and snails. Implications of nutrient release
on freshwater molluscan reproduction, growth, and survival are discussed. 相似文献
4.
Persistent Organochlorine Pesticide Residues in Soil and Surface Water of Northern Indo-Gangetic Alluvial Plains 总被引:1,自引:0,他引:1
This study reports the concentration levels and distribution pattern of the organochlorine pesticide (OCPs) residues in the
soil and surface water samples collected from the northern Indo-Gangetic alluvial plains. A total of 31 soil and 23 surface
water samples were collected from the study region in Unnao district covering an area of 2150 km2 and analyzed for aldrin, dieldrin, endrin, HCB, HCH isomers, DDT isomers/metabolites, endosulfan isomers (α and β), endosulfan
sulfate, heptachlor and its metabolites, α-chlordane, γ-chlordane and methoxychlor. In both the soil and surface water samples
β- and δ-isomers of HCH were detected most frequently, whereas, methoxychlor was the least detected pesticide. The results
showed contamination of soil and surface water of the region with several persistent organic pesticides. The total OCPs level
ranged from 0.36–104.50 ng g–1 and 2.63–3.72 μg L–1 in soil and surface water samples, respectively. 相似文献
5.
Throughout August and September, 2003, wildfires burned in close proximity to Missoula, Montana, with smoke emanating from the fires impacting the valley for much of the summer. This presented the perfect opportunity to measure the levels of polychlorinated dibenzodioxins and dibenzofurans (PCDD/F) comprising ambient forest fire smoke particles impacting the Missoula Valley. An air sampler at the Montana Department of Environmental Quality's (DEQ) compliance site in Missoula measured hourly averages of PM10 throughout the fire season. Three collocated PM2.5 cyclones collected 24-h smoke samples using quartz filters and Polyurethane Foam (PUF) sorbent cartridges. From the quartz filters, concentrations of Organic and Elemental Carbon (OC/EC) were measured, while PCDD/F were measured from one set of a filter (particle phase) and PUF (vapor phase) aggregate of samples in an attempt to also investigate the different phases of PCDD/F in forest fire smoke impaired communities.Hourly PM10 concentrations peaked at 302.9 μg m−3 on August 15. The highest OC concentration (115.6 μg m−3) was measured between August 21–22, and the highest EC concentration of 10.5 μg m−3 was measured August 20–21. Measurable concentrations of PM2.5 associated PCDD/Fs were not detected from a representative aggregate sample, with the exception of small amounts of 1,2,3,4,6,7,8-heptachlorodibenzodioxin and octachlorodibenzodioxin. PM2.5 samples collected during the smoke events were composed of approximately 65% OC. However, the OC fraction of the particles collected in the smoke impaired Missoula valley was not composed of significant amounts of PCDD/F. 相似文献
6.
Licata P Naccari F Dugo G Fotia V Lo Turco V Potorti AG Di Bella G 《Environmental monitoring and assessment》2012,184(5):2881-2892
In the present study, we investigated the concentrations and distribution of organochlorine pesticides (OCs) and polychlorinated
biphenyls (PCBs) in intestine, liver, and muscle samples of 11 common buzzards (Buteo buteo) from Sicily used as bioindicator for monitoring pollution in environment. All samples of common buzzards were collected
at the “Recovery Center of Wild Fauna” of Palermo, through the Zooprophilactic Institute. Quantitative determination of OCs
and PCBs in the samples examined has been carried out using HRGC-ECD and GC-MS. The results obtained show the presence of
concentrations of ∑DDT and ∑PCB in almost all samples. Regarding ∑DDT (4,4′-DDE, 2,4′-DDD, 4,4′-DDD, 2,4′-DDT, and 4,4′-DDT), the highest concentrations were found in intestine (0.411 ± 0.050 μg/g) followed by muscle (0.130 ± 0.017 μg/g) and
liver samples (0.109 ± 0.014 μg/g). As regards the ∑PCB congeners (PCB-28, PCB-52, PCB-95, PCB-99, PCB-101, PCB-110, PCB-138,
PCB-146, PCB-149, PCB-151, PCB-153, PCB-170, PCB-177, PCB-180, PCB-183, and PCB-187), the highest concentrations were found
in intestine (1.686 ± 0.144 μg/g) followed by liver (1.064 ± 0.162 μg/g) and muscle samples (0.797 ± 0.078 μg/g). Our data
deserve particular attention not only for their significance but especially because they were recorded in Sicily, a region
with a very low risk of environmental pollution due to the shortage of industries. 相似文献
7.
One hundred forty seven samples of bovine milk were collected from 14 districts of Haryana, India during December 1998–February
1999 and analysed for the presence of organochlorine pesticide (OCPs) residues. ∑HCH, ∑DDT, ∑endosulfan and aldrin were detected
in 100%, 97%, 43% and 12% samples and with mean values of 0.0292, 0.0367, 0.0022 and 0.0036 μg/ml, respectively. Eight percent
samples exceeded the maximum residue limit (MRL) of 0.10 mg/kg as recommended by WHO for ∑HCH, 4% samples of 0.05 mg/kg for
α-HCH, 5% samples of 0.01 mg/kg for γ-HCH, 26% samples of 0.02 mg/kg for β-HCH as recommended by PFAA and 24% samples of 0.05 mg/kg
as recommended by FAO for ∑DDT. Concentrations of β-HCH and p,p′-DDE were more as compared to other isomers and metabolites
of HCH and DDT. 相似文献
8.
An assessment of heavy metals loading in River Benue in the Makurdi Metropolitan Area in Central Nigeria 总被引:1,自引:0,他引:1
River Benue, the second largest river in Nigeria, serves as the major source of municipal water supplies for towns and villages
along its course. Water samples from the river were collected at ten stations in the Makurdi metropolitan area (7°44′ N, 8°32′ E) in Benue State, Central Nigeria, for 12 months and analyzed for their heavy metals concentration, along with other water-quality
parameters such as turbidity, pH, total dissolved solids and total solids. The results revealed that the mean concentrations
of heavy metals in the river was in the following ascending order, Cd < Cu < Zn < Mn < Pb < Cr < Fe. The levels of most of
the parameters determined, with the exception of Cd, Cr and Pb were, generally, within acceptable limits for drinking water.
From the present study, it is concluded that the River Benue is only moderately contaminated with regard to heavy metals,
in the Makurdi metropolitan area. 相似文献
9.
In this study, SO2 dispersion over İzmit Gulf is simulated by California Puff (CALPUFF) model for three air pollution cases, which occurred
on January 28, February 12, and February 26, 1997. These days are generally characterized by dominant high-pressure systems
– pressure values reaching 1032 mb, low wind speeds and sometimes calm conditions, and low temperatures with a minimum of
0°C. Hourly simulations during those critical cases were carried out and results revealed very high concentrations of SO2 transported to the downwind regions of Tüpraş and Gebze, and values sometimes exceeded 1,000 μg/m3. Nighttime and morning simulations associated with inversion produced considerably higher values of SO2 than the afternoon simulations associated with breeze. Model verification was conducted by comparing the measured daily average
values of eight stations with the model predicted values at the same receptor points. Results showed that the model well predicted
the values at station Gebze in all three cases. The model sometimes underestimated and sometimes overestimated the concentrations
at other receptor stations. 相似文献
10.
The concentrations of 210Pb in the atmosphere of Kuwait Cityhave been monitored over a period of five years (January 1994 toDecember 1998) using cellulose air filters for analysis with liquid scintillation counting for gross beta. Results show thatthe distribution of daily averaged 210Pb concentrations varied from 0.002 to 2.53 mBqm-3 with an average of 0.896 mBqm-3 and a geometric mean of 0.687 mBqm-3. The studysuggests that the existence of 210Pb in air in Kuwait originates mainly from re-circulated fraction of 210Pb whichwas already deposited on ground surface, not from direct decay of radon.The long-term trend pattern for the five years shows a seasonalvariation with maximum concentrations occurring in the autumn season. 相似文献
11.
Anthropogenic nexus on organochlorine pesticide pollution: a case study with Tamiraparani river basin,South India 总被引:2,自引:0,他引:2
Kumarasamy P Govindaraj S Vignesh S Rajendran RB James RA 《Environmental monitoring and assessment》2012,184(6):3861-3873
The levels of 17 organochlorine pesticides residues (OCPs) in surface water and sediments from Tamiraparani river basin, South
India were investigated to evaluate their potential pollution and risk impacts. A total of 96 surface water and sediment samples
at 12 sampling stations were collected along the river in four seasons during 2008–2009. The ΣOCP concentrations in surface
water and sediments were in the range of 0.1 to 79.9 ng l−1 and 0.12 to 3,938.7 ng g−1 dry weight (dw), respectively. Among the OCPs, the levels of dichlorodiphenyltrichloroethanes (DDTs), aldrin, dieldrin, cis-chlordane, trans-chlordane, and mirex were dominant in the sediments. The dominant OCPs in water samples are heptachlor, o,p′-DDE, dieldrin,
o,p′-DDD, and mirex, which show different source of contamination pattern among sampling seasons. The distribution pattern
of DDTs, hexachlorocyclohexane, and other OCPs in the present study shows heterogenic nature of nonpoint source of pollution.
Notable contamination of water and sediment sample that was observed in upstream (S2) 58 ng l−1 and downstream (S11) 1,693 ng g−1 dw explains agricultural and municipal outfalls, whereas frequent damming effect reduces the concentration level in the midstream.
The overall spatial–temporal distribution pattern of ΣOCP residues are illustrated by GIS package. 相似文献
12.
Ikem A Campbell M Nyirakabibi I Garth J 《Environmental monitoring and assessment》2008,140(1-3):69-81
Anthropogenic sources of pollution can significantly contribute to elevated concentrations of toxic elements in soils. A preliminary
survey of trace elements content and their availability in residential soils from New Madrid County, Missouri was undertaken.
Mean elemental concentrations (mg kg−1, dry wt) of sixty two soil samples were: As 6.6, Be 0.8, Cd 1.6, Co 9.7, Cr 24.5, Cu 18.1, Fe 9951, Mn 298, Ni 15.6, Pb 48.8,
V 42.1, Zn 95.5 and Hg 0.05. The US EPA preliminary remediation goals (PRGs) was only exceeded by As (7 % of samples) and
V (8% of samples). The Missouri average background values were exceeded by Pb (69%), Zn (31%), Cu (27%), As (23%), Be (19%),
Co (18%), Ni (16%), V (8%) and Mn (2%). Crustal enrichments (EFc) for As (97), Cr (6), Cu (10), Pb (121), V (7), and Hg (17) were highest for North Lilbourn soils. Fractionation experiment
revealed that Fe (54–79%) was in the residual phase while Zn (70–90%), Mn (88–92%), As (59–81%) and Pb (63–79%) were potentially
available in soils. Factor loadings of the element concentrations on principal components 1, 2 and 3 accounted for over 81%
variance of the data set. The factor loadings suggested that apart from natural contributions of trace elements to the soils,
human activities possibly accounted for other inputs in soils. 相似文献
13.
To analyze polycyclic aromatic hydrocarbons (PAHs) at an urban site in Seoul, South Korea, 24-hr ambient air PM2.5 samples were collected during five intensive sampling periods between November 1998 and December 1999. To determine the PAH
size distribution, 3-day size-segregated aerosol samples were also collected in December 1999. Concentrations of the 16 PAHs
in the PM2.5 particles ranged from 3.9 to 119.9 ng m−3 with a mean of 24.3 ng m−3.An exceptionally high concentration of PAHs(∼120 ng m−3) observed during a haze event in December 1999 was likely influenced more by diesel vehicle exhaust than by gasoline exhaust,
as well as air stagnation, as evidenced by the low carbon monoxide/elemental carbon (CO/EC) ratio of 205 found in this study
and results reported by previous studies.
The total PAHs associated with the size-segregated particles showed unimodal distributions. Compared to the unimodal size
distributions of PAHs with modal peaks at < 0.12 μm measured in highway tunnels in Los Angeles (Venkataraman and Friedlander,
1994), four- to six-ring PAHs in our study had unimodal size distributions, peaking at the larger size range of 0.28–0.53
μm, suggesting the coagulation of freshly emitted ultrafine particles during transport to the sampling site. Further, the
fraction of PAHs associated with coarse particles(> 1.8 μm) increased as the molecular weight of the PAHs decreased due to
volatilization of fine particles followed by condensation onto coarse particles. 相似文献
14.
Heavy metal contamination from mining sites in South Morocco: Monitoring metal content and toxicity of soil runoff and groundwater 总被引:5,自引:0,他引:5
El Khalil H El Hamiani O Bitton G Ouazzani N Boularbah A 《Environmental monitoring and assessment》2008,136(1-3):147-160
The aim of the present work is the assessment of metal toxicity in runoff, in their contaminated soils and in the groundwater
sampled from two mining areas in the region of Marrakech using a microbial bioassay MetPLATE™. This bioassay is based on the
specific inhibition of the β-galactosidase enzyme of a mutant strain of Escherichia coli, by the metallic pollutants. The stream waters from all sampling stations in the two mines were all very toxic and displayed
percent enzyme inhibition exceeding 87% except SWA4 and SWB1 stations in mine C. Their high concentrations of copper (Cu) and zinc (Zn) confirm the acute toxicity shown by MetPLATE.
The pH of stream waters from mine B and C varied between 2.1 and 6.2 and was probably responsible for metal mobilization,
suggesting a problem of acid mine drainage in these mining areas. The bioassay MetPLATE™ was also applied to mine tailings
and to soils contaminated by the acidic waters. The results show that the high toxicity of these soils and tailings was mainly
due to the relatively concentration of soluble Zn and Cu. The use of MetPLATE™ in groundwater toxicity testing shows that,
most of the samples exhibited low metal toxicity (2.7–45.5% inhibition) except GW3 of the mine B (95.3% inhibition during
the wet season and 82.9% inhibition during the dry season). This high toxicity is attributed to the higher than usual concentrations
of Cu (189 μg Cu l−1) and Zn (1505 μg Zn l−1). These results show the potential risk of the contamination of different ecosystems situated to the vicinity of these two
metalliferous sites. The general trend observed was an increase in metal toxicity measured by the MetPLATE with increasing
total and mobile metal concentrations in the studied matrices. Therefore, the MetPLATE bioassay is a reliable and fast bioassay
to estimate the metals toxicity in the aquatic and solids samples. 相似文献
15.
Alam JB Hossain A Khan SK Banik BK Islam MR Muyen Z Rahman MH 《Environmental monitoring and assessment》2007,134(1-3):233-242
Surma River is polluted day by day by human activities, poor structured sewerage and drainage system, discharging industrial
and household wastes. The charas (natural channels) are responsible for surface runoff conveyance from its urban catchments
to the receiving Surma River. Water samples have been collected from a part of Surma River along different points and analyzed
for various water quality parameters during dry and monsoon periods. Effects of industrial wastes, municipal sewage, and agricultural
runoff on river water quality have been investigated. The study was conducted within the Chattak to Sunamganj portion of Surma
River, which is significant due to the presence of two major industries – a paper mill and a cement factory. The other significant
feature is the conveyors that travel from India to Chattak. The river was found to be highly turbid in the monsoon season.
But BOD and fecal coliform concentration was found higher in the dry season. The water was found slightly acidic. The mean
values of parameters were Conductivity 84–805 μs; DO: dry-5.52 mg/l, monsoon-5.72 mg/l; BOD: dry-1mg/l, monsoon-0.878 mg/l;
Total Solid: dry-149.4 mg/l, monsoon-145.7 mg/l. In this study, an effort has been taken to investigate the status of concentration
of phosphate (PO−4) and ammonia–nitrogen (NH4–N) at four entrance points of Malnichara to the city, Guali chara, Gaviar khal and Bolramer khal. Data has been collected
from March–April and September–October of 2004. Concentrations have been measured using UV Spectrophotometer. Although the
phosphate concentration has been found within the limit set by DOE for fishing, irrigation and recreational purposes, however
ammonia–nitrogen has been found to exceed the limit. 相似文献
16.
Hang Thi Nguyen Ki-Hyun Kim Chang-Hee Kang Kum-Chan Choi 《Environmental monitoring and assessment》2010,163(1-4):149-169
The metal concentrations of As, Be, Cr, Hg, Mn, and Ni in ambient air were measured at four sites in Japan from October 1997 to March 2006. The mean metal concentration data measured from the four sites (K1, K2, M, and Y) are found on the order of Mn > Cr–Ni > As > Hg > Be. The concentrations of Mn with the highest mean value were fairly variable across four sites such as 45.9 ± 42.8 (K1), 25.6 ± 19.4 (K2), 22.5 ± 19.7 (M), and 25.4 ± 19.8 ng m???3 (Y). In contrast, the concentrations of Be with the lowest mean value were less variable across four sites with means of 0.03 to 0.04 ng m???3. Inspection of the seasonal patterns indicates the peak occurrence of most metals during spring, although relative dominance during winter is seen at the most polluted area (K1). Evaluation of long-term patterns indicates that the noticeably high values of metals in the early stage of study reduced gradually across the years, although the metal concentration levels in most areas were affected significantly by anthropogenic activities. However, efforts to control pollution levels seemed to gradually contribute to a decrease in metal concentration levels of all study sites through the years. 相似文献
17.
Boyacioglu H Haliki A Ates M Guvensen A Abaci O 《Environmental monitoring and assessment》2007,135(1-3):327-334
This study aims to investigate the differences in the concentrations of airborne fungi and pollens between the towns located
in the province of Izmir and to determine the factors contributing to these differences. Five stations in each of four towns
(Buca, Konak, Bornova, and Karsiyaka) were randomly selected as the research areas. Fungus (cfu/m3) and pollen counts (cm2/pollen count) in the air samples collected from each station between June 2003 and May 2004 were measured. The results revealed
that whereas Karsiyaka had the highest fungus concentration (521.33 ± 777.1), Buca and Bornova had the lowest concentration
(482.67 ± 308.44). The mean fungus concentration in the province of İzmir was 501.5 ± 486.7. Pollen concentration was the
highest in Konak (486.67 ± 839.06) and the lowest in Bornova (369.83 ± 551.13). Fungus and pollen concentrations revealed
no difference between the towns (p > 0.05). The relationship between pollen-fungus concentrations and temperature-dust-humidity-sulphurdioxide was investigated
but it was found statistically insignificant (p > 0.05). As a result of regression analysis, it was determined that correlation of atmospheric parameters had no effects
on pollen and fungus concentrations (p > 0.05). 相似文献
18.
The objective of the study is to investigate seasonal and spatial variations of PM10 (particulate matter with aerodynamic diameter less than or equal to 10 μm) and TSP (total suspended particulate matter) of
an Indian Metropolis with high pollution and population density from November 2003 to November 2004. Ambient concentration
measurements of PM10 and TSP were carried out at two monitoring sites of an urban region of Kolkata. Monitoring sites have been selected based
on the dominant activities of the area. Meteorological parameters such as wind speed, wind direction, rainfall, temperature
and relative humidity were also collected simultaneously during the sampling period from Indian Meteorological Department,
Kolkata. The 24 h average concentrations of PM10 and TSP were found in the range 68.2–280.6 μg/m3 and 139.3–580.3 μg/m3 for residential (Kasba) area, while 62.4–401.2 μg/m3 and 125.7–732.1 μg/m3 for industrial (Cossipore) area, respectively. Winter concentrations of particulate pollutants were higher than other seasons,
irrespective of the monitoring sites. It indicates a longer residence time of particulates in the atmosphere during winter
due to low winds and low mixing height. Spread of air pollution sources and non-uniform mixing conditions in an urban area
often result in spatial variation of pollutant concentrations. The higher particulate pollution at industrial area may be
attributed due to resuspension of road dust, soil dust, automobile traffic and nearby industrial emissions. Particle size
analysis result shows that PM10 is about 52% of TSP at residential area and 54% at industrial area. 相似文献
19.
Custer TW Custer CM Goatcher BL Melancon MJ Matson CW Bickham JW 《Environmental monitoring and assessment》2006,121(1-3):541-558
Current and historical point source discharges, storm water runoff, and accidental spills have contaminated the water, sediment, and biota within the Calcasieu Estuary in southwestern Louisiana. In 2003, barn swallow (Hirundo rustica) eggs and nestlings were collected beneath two bridges that cross Bayou d′Inde, the most contaminated waterway within the Calcasieu Estuary. Samples were also collected from a bridge over Bayou Teche, a reference site in south central Louisiana. Polychlorinated biphenyl (PCB) concentrations in barn swallow eggs and nestlings were significantly higher at the downstream site on Bayou d′Inde (2.8 μ g/g PCBs in eggs and 1.5 μ g/g PCBs in nestlings) than at the other two sites (< 0.2 μ g/g PCBs in eggs and nestlings at both sites). Ethoxyresorufin-O-dealkylase activity in nestling livers was significantly higher at the downstream site on Bayou d′Inde (50 pmol/min/mg) compared to the other two locations (24 pmol/min/mg, each), probably because of exposure to PCBs. Polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran concentrations in eggs and polycyclic aromatic hydrocarbons in nestlings were at background concentrations at all sites. Trace element concentrations in barn swallow eggs and nestling livers were at background levels and did not differ among the three sites. A biomarker of DNA damage did not differ among sites. 相似文献
20.
Our objective was to determine the levels of selected airborne contaminants in ambient air at the Mississippi Sandhill Crane National Wildlife Refuge, Mississippi, that might be affecting the health of endangered cranes living there. Two high-volume air samplers were operated at separate locations on the Refuge during May–September 1991. The sampling media were micro-quartz filters in combination with polyurethane foam plugs. Composite bimonthly samples from each station were analyzed for polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), coplanar polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs). Overall, residue concentrations were low. The toxic PCDD isomer 2,3,7,8-tetra-CDD was not detected, nor was penta-CDD. There was no difference (P>0.05) in residue concentrations between stations or over time and meteorological parameters were not correlated with residue concentrations. Because contaminant levels and patterns may differ seasonally, we recommend that air samples collected during winter months also be analyzed for these same chemical groups. 相似文献