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排序方式: 共有188条查询结果,搜索用时 15 毫秒
111.
P. R. Thawale S. Satheesh Babu R. R. Wakode Sanjeev Kumar Singh Sunil Kumar A. A. Juwarkar 《Environmental monitoring and assessment》2011,177(1-4):527-535
The air pollution due to anthropogenic activities seriously affected human life, vegetation, and heritage as well. The vegetation cover in and around the city mitigates the air pollution by acting as a sink for pollution. An attempt was made to evaluate biochemical changes occurred in four selected plant species, namely Azadirachta indica, Mangifera indica, Delonix regia, and Cassia fistula of residential, commercial, and industrial areas of Nagpur city in India. It was observed that the correlated values of air pollutants and plant leaves characteristics alter foliar biochemical features (i.e., chlorophyll and ascorbic acid content, pH and relative water content) of plants due to air pollution. The changes in air pollution tolerance index of plants was also estimated which revealed that these plants can be used as a biomarker of air pollution. 相似文献
112.
Govindaraj Shanmugam Srimurali Sampath Krishna Kumar Selvaraj D. G. Joakim Larsson Babu Rajendran Ramaswamy 《Environmental science and pollution research international》2014,21(2):921-931
Pharmaceutical concentration data for Indian surface waters are currently scarce. Sewage often enters Indian rivers without prior treatment, and so previously reported environmental concentrations from regions with routinely implemented sewage treatment cannot simply be used to predict concentrations in Indian surface water. Improved knowledge of pharmaceutical concentrations in Indian waters would enable determination of potential risks posed to aquatic wildlife and human health in this region. The concentrations of five common non-steroidal anti-inflammatory drugs (NSAIDs; diclofenac, ketoprofen, naproxen, ibuprofen, and acetylsalicylic acid) were determined in surface waters from 27 locations of the Kaveri, Vellar, and Tamiraparani Rivers in southern India. The samples were extracted by solid-phase extraction and analyzed by GC-MS. The measured concentrations of four of the five drugs in this reconnaissance were relatively similar to those reported elsewhere (ND–200 ng/l); however, acetylsalicylic acid, the most readily degradable of the investigated drugs, was found at all sites and at considerably higher concentrations (up to 660 ng/l) than reported in European surface waters. This is the first report on the occurrence of NSAIDs in Indian rivers. The finding of elevated concentrations of acetylsalicylic acid is most likely a result of direct discharges of untreated sewage. Therefore, readily degradable pharmaceuticals may present larger concern in regions without consistent sewage treatment. Based on measured environmental concentrations, the risks of direct toxicity to aquatic wildlife and of humans consuming the water are discussed. 相似文献
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115.
Impact of salinity and pH on phytoplankton communities in a tropical freshwater system: An investigation with pigment analysis by HPLC 总被引:1,自引:0,他引:1
Chakraborty P Acharyya T Raghunadh Babu PV Bandyopadhyay D 《Journal of environmental monitoring : JEM》2011,13(3):614-620
An in vitro study was carried out to understand the effects of salinity shock and variation in pH on phytoplankton communities in a tropical freshwater system of the Godavari River (a major peninsular river in India). The distributions of, and variations in, phytoplankton communities were assessed by quantitative determination of their class specific marker pigments, using HPLC. Subtle changes in salinity of the freshwater by one practical salinity unit (PSU) completely removed green algae from the system and allowed the cyanobacteria to come into dominance. The cyanobacteria were found to tolerate higher osmotic stress until the salinity reached a PSU of 16. The higher salinity tolerance range of the cyanobacteria was attributed to the enhanced synthesis of zeaxanthin as protective xanthophylls against the osmotic stress. However, the effects of changing pH were not as dramatic as salinity where the green algae and the cyanobacteria from the same freshwater system showed a considerable acclimation towards the fluctuating pH. These findings are environmentally relevant to understand the likely impact of salt water intrusion and pH variation on phytoplankton communities in a tropical freshwater system. 相似文献
116.
Kuchelar Prasanna Ramesh Shiam Babu Ramasamy Annadurai Sugirthamani Anandh Kaliaperumal 《Journal of Material Cycles and Waste Management》2022,24(4):1565-1578
Journal of Material Cycles and Waste Management - Leachate from the secured landfill sites and open dumpsite seems to be threat to environment, which requires an immediate attention to investigate... 相似文献
117.
Manikandan Dinesh Babu Arumugam Manikandan Veeran Srinivasan Sridhar Arun Krishnasamy Sekar Rajkumar Perumalsamy Balaji Ramasamy Thirumurugan 《Environmental science and pollution research international》2021,28(26):33927-33941
Environmental Science and Pollution Research - Nanotechnology tends to be a swiftly growing field of research that actively influences and inhibits the growth of bacteria/cancer. Noble metal... 相似文献
118.
J Rajesh Banu Essaki Raj S Kaliappan Dieter Beck Ick-Tae Yeom 《Journal of environmental biology / Academy of Environmental Biology, India》2007,28(4):741-745
Overtones of fruit wastes accumulate daily in the city of Chennai, India and there is an urgent need to develop, assess and use ecofriendly methods to dispose them. Presently an attempt has been made to study solid state biomethanation of fruit wastes using a laboratory scale anaerobic digester Fruit wastes containing 3%, 4% and 5% solids were used for experimentation. Daily and cumulative production of biogas produced during the study was recorded. Increase in nitrogen, phosphorus and potassium content in the feed was observed during the digestion. During the study the biogas generation increased with increase in total solids. While the gas generation was 0.006 m3/day/m3 of the reactor volume when the solid content was 3% the corresponding values for 4% and 5% solids were 0.27and 0.35 m3 respectively Varying TS 3% to 4% has no effect on fermentation stability and pH remained between 6.8 and 7.4, but an inhibition of methanogenic bacteria was observed for TS 5%. The overall performance of the reactor was depressed by changing feed concentration from 3% to 5%. Experiments with 4% initial solid contend was ideal for solid-state biomethanation. 相似文献
119.
R. Rajesh Kannan M. Rajasimman N. Rajamohan B. Sivaprakash 《Frontiers of Environmental Science & Engineering in China》2010,4(1):116-122
In this study, the biosorption of Malachite green (MG) onto Turbinaria conoides, brown marine algae, was studied with respect
to initial pH, temperature, initial dye concentration, and sorbent dosage. The optimum initial pH and temperature values for
MG removal were found to be 8.0 and 30°C, respectively. Sorbent dosage was found to strongly influence the removal of MG.
Equilibrium studies were carried out to test the validity of the Langmuir (q
max = 66.6 mg/g and b = 0.526 mL mol/L) and the Freundlich (n = 1.826 and K = 3.751 mg/g) isotherms. The kinetic studies indicated the validity of the pseudo first-order and second-order equation. 相似文献
120.
Rajesh Govindan Anna Korre Sevket Durucan Claire E. Imrie 《International Journal of Greenhouse Gas Control》2011,5(3):589-597
Remote sensing has demonstrated success in various environmental applications over the past three decades. This is largely attributed to its ability for good areal coverage and continued development in sensor technologies. Carbon dioxide Capture and Storage (CCS) is an emerging climate change mitigation technology where monitoring is vital for its sustainability. This research investigates the use of spectral remote sensing imagery in detecting potential CO2 occurrences at the surface, should a leakage occur from subsurface reservoirs where CO2 is stored. Currently, there are no known leakages of CO2 at industrial storage sites, therefore, this research was carried out at the Latera natural analogue site in Italy, in order to develop the methodology described. This paper describes the use of a popular probabilistic information fusion theory, referred to as the Dempster–Shafer theory of evidence, to analyse outlier pixels (anomalies). Outlier pixels are first determined using a new geostatistical image filtering methodology based on Intrinsic Random Function (IRF), Independent Component Analysis (ICA), and the industry standard parametric Reed–Xiaoli (RX) anomaly detection. Information fusion of detected outlier pixels and indirect surface effects of CO2 leakage over time, such as stressed vegetation or mineral alterations, assigns a confidence measure per outlier pixel in order to identify potential leakage points. After visual validation using direct field measurements, it was demonstrated that the proposed methodology is able to detect majority of the seepage points at Latera, and holds promise as a new unsupervised CO2 monitoring methodology. 相似文献