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排序方式: 共有136条查询结果,搜索用时 12 毫秒
61.
Banerjee Aditya Singh Ankur Roychoudhury Aryadeep 《Environmental science and pollution research international》2021,28(30):40220-40232
Environmental Science and Pollution Research - Ingestion of fluoride through consumption of contaminated food grains has been regarded to be hazardous for consumer health. The current study... 相似文献
62.
The metabolic fate of mancozeb in tomato (Lycopersicon esculentum Mill.) fruits was evaluated. Results indicate rapid dissipation of mancozeb and its metabolic conversion to ethylenethiourea (ETU), the carcinogenic metabolite. Treatment with mancozeb at flowering stage resulted translocation of ETU in newly emerged fruits indicating the systemic nature of ETU. ETU was detected within one hour of final spraying of mancozeb at the doses of 1.5 and 3?kg a.i./ha. The residue level of ETU increased up to 3-day for both the treatments, which then rapidly dissipated to safer metabolite ethyleneurea (EU) and reached the below detectable limit within 25 days. Cooking of fresh tomatoes caused decontamination of mancozeb residues, which was associated with simultaneous increase in ETU residues. The degradation pattern of ETU after application of mancozeb was slower as compared to the spraying of ETU as such on the crop. A pre-harvest interval of 25 days is recommended. 相似文献
63.
Heavy metal assessment using geochemical and statistical tools in the surface sediments of Vembanad Lake, Southwest Coast of India 总被引:1,自引:0,他引:1
Selvam AP Priya SL Banerjee K Hariharan G Purvaja R Ramesh R 《Environmental monitoring and assessment》2012,184(10):5899-5915
The geochemical distribution and enrichment of ten heavy metals in the surface sediments of Vembanad Lake, southwest coast of India was evaluated. Sediment samples from 47 stations in the Lake were collected during dry and wet seasons in 2008 and examined for heavy metal content (Al, Fe, Mn, Cr, Zn, Ni, Pb, Cu, Co, Cd), organic carbon, and sediment texture. Statistically significant spatial variation was observed among all sediment variables, but negligible significant seasonal variation was observed. Correlation analysis showed that the metal content of sediments was mainly regulated by organic carbon, Fe oxy-hydroxides, and grain size. Principal component analysis was used to reduce the 14 sediment variables into three factors that reveal distinct origins or accumulation mechanisms controlling the chemical composition in the study area. Pollution intensity of the Vembanad Lake was measured using the enrichment factor and the pollution load index. Severe and moderately severe enrichment of Cd and Zn in the north estuary with minor enrichment of Pb and Cr were observed, which reflects the intensity of the anthropogenic inputs related to industrial discharge into this system. The results of pollution load index reveal that the sediment was heavily polluted in northern arm and moderately polluted in the extreme end and port region of the southern arm of the lake. A comparison with sediment quality guideline quotient was also made, indicating that there may be some ecotoxicological risk to benthic organisms in these sediments. 相似文献
64.
Hydrochemical analysis to evaluate the seawater ingress in a small coral island of India 总被引:1,自引:0,他引:1
Banerjee P Singh VS Singh A Prasad RK Rangarajan R 《Environmental monitoring and assessment》2012,184(6):3929-3942
The sustainable development of the limited groundwater resources in the tropical island requires a thorough understanding
of detail hydrogeological regime including the hydrochemical behavior of groundwater. Detail analysis of chemical data of
groundwater helps in assessing the different groundwater zone affected by formation as well as sea water. Groundwater and
saline water interaction is better understood using groundwater major ion chemistry over an island aquifer. Multivariate methods
to analyze the geochemical data are used to understand geochemical evolution of groundwater. The methods are successfully
used to group the data to evaluate influence of various environs in the study area. Various classification methods such as
piper, correlation method, and salinity hazard measurements are also employed to critical study of geochemical characteristics
of groundwater to identify vulnerable parts of the aquifer. These approaches have been used to successfully evaluate the aquifer
zones of a tiny island off the west coast of India. The most part of island is found to be safe for drinking, however some
parts of island are identified that are affected by sea water ingress and dissolution of formation minerals. The analysis
has successfully leaded to identification of that part of aquifer on the island which needs immediate attention for restoration
and avoids further deterioration. 相似文献
65.
Mridul Chetia Soumya Chatterjee Saumen Banerjee Manash J. Nath Lokendra Singh Ravi B. Srivastava Hari P. Sarma 《Environmental monitoring and assessment》2011,173(1-4):371-385
Distribution of arsenic (As) and its compound and related toxicology are serious concerns nowadays. Millions of individuals worldwide are suffering from arsenic toxic effect due to drinking of As-contaminated groundwater. The Bengal delta plain, which is formed by the Ganga?CPadma?CMeghna?CBrahmaputra river basin, covering several districts of West Bengal, India, and Bangladesh is considered as the worst As-affected alluvial basin. The present study was carried out to examine As contamination in the state of Assam, an adjoining region of the West Bengal and Bangladesh borders. Two hundred twenty-two groundwater samples were collected from shallow and deep tubewells of six blocks of Golaghat district (Assam). Along with total As, examination of concentration levels of other key parameters, viz., Fe, Mn, Ca, Na, K, and Mg with pH, total hardness, and SO $_{4}^{2-}$ , was also carried out. In respect to the permissible limit formulated by the World Health Organization (WHO; As 0.01 ppm, Fe 1.0 ppm, and Mn 0.3 ppm for potable water), the present study showed that out of the 222 groundwater samples, 67%, 76.4%, and 28.5% were found contaminated with higher metal contents (for total As, Fe, and Mn, respectively). The most badly affected area was the Gamariguri block, where 100% of the samples had As and Fe concentrations above the WHO drinking water guideline values. In this block, the highest As and Fe concentrations were recorded 0.128 and 5.9 ppm, respectively. Tubewell water of depth 180 ± 10 ft found to be more contaminated by As and Fe with 78% and 83% of the samples were tainted with higher concentration of such toxic metals, respectively. A strong significant correlation was observed between As and Fe (0.697 at p < 0.01), suggesting a possible reductive dissolution of As?CFe-bearing minerals for the mobilization of As in the groundwater of the region. 相似文献
66.
Application of drastic model and GIS: for assessing vulnerability in hard rock granitic aquifer 总被引:2,自引:0,他引:2
Ranjeet Kumar Prasad V. S. Singh S. K. G. Krishnamacharyulu Pallavi Banerjee 《Environmental monitoring and assessment》2011,176(1-4):143-155
Geographic information system (GIS) has become one of the leading tools in the field of hydrogeological science that helps in assessing, monitoring, and conserving groundwater resources. Groundwater is a finite resource, which is being overexploited due to increase in demand over the years leading to decrease in its potentiality. In the present study, DRASTIC model has been used to prepare groundwater vulnerable zone in hard rock aquifer of granitic terrain. The main objective is to determine susceptible zone for groundwater pollution by integrating hydrogeological layers in GIS environment. The layers such as depth of aquifer, recharge, aquifer yield, soil type, topography, vadose zone, and transmissivity are incorporated in the DRASTIC model. The final output of the map shows that around 60% of the area falls under low to no risk of pollution zone. The high risk of pollution zones are mostly present towards the margin of southeastern periphery. The lower part of the basin as well as small area on northern side falls under moderate risk of pollution zone. For the assessment of groundwater pollution zone, 24 groundwater samples have been collected from different vulnerable zones. The chemical analysis of sample shows that the southeastern margin of basin has relatively high concentration of nitrate as compared to other parts of the basin. It is present in high pollution zone as well as moderate pollution zone. The present model can be used for assessment and management of groundwater. 相似文献
67.
68.
Rai HS Singh S Cheema PP Bansal TK Banerjee UC 《Journal of environmental management》2007,83(3):290-297
In the present study, decolorization of a simulated dye waste containing three different triphenylmethane (TPM) dyes--Magenta, Malachite Green and Crystal Violet, was investigated in a laboratory scale, two-stage anaerobic high-rate reactor. The effect of various parameters (influent dye concentration, hydraulic and co-substrate loading rates) on color and COD removal efficiency of the reactor has been studied. It has been shown that the influent dye concentration had little effect on overall COD and color removal efficiency. More than 99% color removal and 96% COD removal efficiency were maintained even at a dye concentration of 500 mg/l and a dye loading rate of 1000 mg/l day. However, a minimum level of glucose as supplementary carbon source is required to maintain the maximum color removal efficiency and it drops appreciably when no glucose is added to the influent. The study also showed that the acidogenic phase of the reaction plays an important role in decolorization of the TPM dyes. In addition, the two-stage anaerobic reactor was observed to have distinct advantages over the single-stage system, as the drop in color and COD removal efficiency of stage 1 are adequately compensated by stage 2 of the reactor especially under high dye loading rates accompanied by low co-substrate loading and under reduced HRTs. 相似文献
69.
70.
Naturally abundant rubber sawdust has been utilized as a stationary support, which after immobilization with a chelating polyelectrolyte (xylenol orange as counterion) gets converted into a suitable column packing material for isolation and enrichment of trace level target analyte, accurately detectable by the technique of differential pulse anodic stripping voltammetry. The sorbent is robust and re-usable in column-chromatography without showing any leaching and interference complications. Its unique lead ion selectivity from multielemental complex matrices (synthetic water sample, blood serum) at optimized column conditions (pH 2.5 and flow rate 0.5?mL?min?1) mitigates the usual problems of intermetallic and readsorption effects. Effects of flow rate, pH, equilibration time, and other variables are reported. The system has advantageous feature to be used in a single-column ion chromatography with satisfactory performance. A modest attempt has been made to determine lead fractions in human blood serum samples on the bases of selective retention of ionic and labile fractions on complexing resin. 相似文献