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81.
82.
Zhenming Zhou Canyang Lin Shuwen Li Shupo Liu Fei Li Baoling Yuan 《Frontiers of Environmental Science & Engineering》2022,16(3):29
83.
运河(杭州段)底质有机质与重金属元素相关性的探讨 总被引:7,自引:0,他引:7
通过对京杭大运河 (杭州段 )底质的监测 ,探讨了底质有机质与 8种重金属元素的相关性 ,并对其成因作出了解释 ,得出了 8种重金属在运河 (杭州段 )底质中易积累的顺序。 相似文献
84.
Inter-seasonal studies on the trace metal load of surface water, sediment and Tympanotonus fuscatus var. radula of Iko River were conducted between 2003 and 2004. The impact of anthropogenic activities especially industrial effluent,
petroleum related wastes, gas flare and episodic oil spills on the ecosystem are remarkable. Trace metals analyzed included
cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), lead (Pb), manganese (Mn), nickel (Ni), vanadium (V) and zinc (Zn). Sediment
particle size analysis revealed that they were characteristically psammitic and were predominantly of medium to fine grained
sand (>73%), less of silt (<15%) and clay (<10%). These results correlated with low levels of trace elements such as Pb (0.03 ± 0.02 mg kg−1), Cr (0.22 ± 0.12 mg kg−1), Cd (0.05 ± 0.03 mg kg−1), Cu (0.04 ± 0.02 mg kg−1) and Mn (0.23 ± 0.22 mg kg−1) in the sediment samples. This observation is consistent with the scarcity of clayey materials known to be good scavengers
for metallic and organic contaminants. Sediments indicated enhanced concentration of Fe, Ni and V, while other metal levels
were relatively low. The concentrations of all the metals except Pb in surface water were within the permissible levels, suggesting
that the petroleum contaminants had minimal effect on the state of pollution by trace metals in Iko River. Notably, the pollutant
concentrations in the sediments were markedly higher than the corresponding concentrations in surface water and T. fuscatus tissues, and decreased with distance from point sources of pollution. 相似文献
85.
In this work, water and sediment samples were collected from three different stations located along the Sakarya river between
May and September 2003. Lead, copper, chromium, zinc, nickel and cadmium concentrations were determined by using solvent extraction
and flame atomic absorption spectrometric method. The results show that differences based upon sampling times, regions, sediment
and water samples were observed. The mean levels of copper, nickel, chromium, lead, cadmium, zinc for sediment samples are;
4.630 μg g−1, 13.520 μg g−1, 8.780 μg g−1, 2.550 μg g−1, 9.990 μg g−1 and for water samples are; 0.851 μg g−1, 1.050 μg g−1, 0.027 μg g−1, 1.786 μg g−1, 0.236 μg g−1, 0.173 μg g−1, respectively. 相似文献
86.
Heavy Metal Concentrations in Water, Sediment, Fish and Some Benthic Organisms from Tigris River, Turkey 总被引:4,自引:0,他引:4
In this study concentrations of heavy metals, such as Cd, Co, Cu, Fe, Mn, Ni, Pb and Zn were determined in water, sediment,
muscle, liver and gill of fish (Silurus triostegus, Mastacembelus simack, Mystus halepensis, Orthrias euphraticus) the muscle and liver of crab (Potamon fluviatilis), the internal organs of fresh water snail (Physa acuta), and mussel (Unio elongatulus), and in whole biomass of green algae (Spirogyra sp.) examples collected seasonally from three selected sites (I, II, and III) of Tigris River and from a reference site on
Resan Creek. In general, the average Cd, Cu, Mn, Ni, Zn, and Fe values in Sites I, II, and III were found to be high in spring
and summer. The concentrations of heavy metals in the Tigris River are compared with previous studies in the same sites. The
results showed that Cu levels have gradually decreased during recent years. In Tigris River, among the living organisms, i.e.,
those which are living in benthic region and showing biomonitor characteristic, crab, snail, green algae, mussel and fish
are seen to be formed in sequence. Cu, Fe, Mn and Zn values obtained from the muscle of fish and from the mass of internal
organs of mussel and snail were found to be under the acceptable values suggested. 相似文献
87.
Subsurface soils near Clyde Forks, Ontario, Canada, can have naturally high concentrations of mercury (Hg) from local geological sources. To investigate Hg in local aquatic food webs, Hg was measured in fish dorsal muscle (mainly yellow perch [YP] and pumpkinseed sunfish [PS]) and surface sediments from 10 regional lakes. Water chemistry, along with fork length, weight, and stable isotopes (delta15N, delta13C, delta34S) in fish were also measured. No lake sediments had elevated (>0.3microg/g dw) Hg, and average Hg concentrations in fish were not sufficiently high (<1microg/g dw) to be of concern for fish-eating wildlife. Variance in fish Hg was best explained by dietary carbon source (delta13C), and certain lake variables (e.g., pH for YP). PS with more pelagic feeding habits had higher delta34S and Hg than those with more littoral feeding habits. Potential biological linkages between fish Hg and delta34S, a parameter that may be related to the lake sulphate-reducing bacteria activity, requires further investigation. 相似文献
88.
K. Srogi 《Environmental Chemistry Letters》2007,5(4):169-195
Polycyclic aromatic hydrocarbons (PAHs) are a large group of organic compounds with two or more fused aromatic rings. They
have a relatively low solubility in water, but are highly lipophilic. Most of the PAHs with low vapour pressure in the air
are adsorbed on particles. When dissolved in water or adsorbed on particulate matter, PAHs can undergo photodecomposition
when exposed to ultraviolet light from solar radiation. In the atmosphere, PAHs can react with pollutants such as ozone, nitrogen
oxides and sulfur dioxide, yielding diones, nitro- and dinitro-PAHs, and sulfonic acids, respectively. PAHs may also be degraded
by some microorganisms in the soil. PAHs are widespread environmental contaminants resulting from incomplete combustion of
organic materials. The occurrence is largely a result of anthropogenic emissions such as fossil fuel-burning, motor vehicle,
waste incinerator, oil refining, coke and asphalt production, and aluminum production, etc. PAHs have received increased attention
in recent years in air pollution studies because some of these compounds are highly carcinogenic or mutagenic. Eight PAHs
(Car-PAHs) typically considered as possible carcinogens are: benzo(a)anthracene, chrysene, benzo(b)fluoranthene, benzo(k)fluoranthene,
benzo(a)pyrene (B(a)P), dibenzo(a,h)anthracene, indeno(1,2,3-cd)pyrene and benzo(g,h,i)perylene. In particular, benzo(a)pyrene
has been identified as being highly carcinogenic. The US Environmental Protection Agency (EPA) has promulgated 16 unsubstituted
PAHs (EPA-PAH) as priority pollutants. Thus, exposure assessments of PAHs in the developing world are important. The scope
of this review will be to give an overview of PAH concentrations in various environmental samples and to discuss the advantages
and limitations of applying these parameters in the assessment of environmental risks in ecosystems and human health. As it
well known, there is an increasing trend to use the behavior of pollutants (i.e. bioaccumulation) as well as pollution-induced
biological and biochemical effects on human organisms to evaluate or predict the impact of chemicals on ecosystems. Emphasis
in this review will, therefore, be placed on the use of bioaccumulation and biomarker responses in air, soil, water and food,
as monitoring tools for the assessment of the risks and hazards of PAH concentrations for the ecosystem, as well as on its
limitations. 相似文献
89.
Kun Li Tingming Ye Wang Zhang Jianfeng Peng Yaohui Bai Weixiao Qi Huijuan Liu 《Frontiers of Environmental Science & Engineering》2022,16(2):17
90.
Bioremediation of tributyltin contaminated sediment: degradation enhancement and improvement of bioavailability to promote treatment processes 总被引:1,自引:0,他引:1
Bioremediation of tributyltin (TBT) contaminated sediment was studied and degradation enhancement and improvement of bioavailability were also investigated. In TBT spiked sediment, the half-life of TBT in the control sample, representing natural attenuation, was 578 d indicating its persistence. In the stimulated sample (pH 7.5, aeration and incubated at 28 °C), the half-life was significantly reduced to 11 d. Further stimulation by nutrient addition (succinate, glycerol and l-arginine) or inoculation with Enterobacter cloacae (∼107 viable cells g−1 of sediment) resulted in half-life reduction to 9 and 10 d, respectively. In non-spiked sediment, the indigenous microorganisms were able to degrade aged TBT, but the extended period of contamination decreased the degradation efficiency. To improve bioavailability, addition of surfactant, adjustment of salinity and sonication were studied. The highest percentage solubilisation of TBT in water was obtained by adjusting salinity to 20 psu, which increased the solubility of TBT from 13% to 33%. Half-lives after bioavailability was improved were 5, 4 and 4 d for stimulation, stimulation w/nutrient addition and stimulation w/inoculation, respectively. However, natural attenuation in the control sample was not enhanced. The results show that providing suitable conditions is important in enhancing TBT biodegradation, and bioavailability improvement additionally increased the rate and degraded amount of TBT. Unfortunately, nutrient addition and inoculation of the degrader did not enhance the degradation appreciably. 相似文献