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1.
This paper shows that spent lubricating oils from automobile engines generate carboxylic acids on environmental exposure. Samples of exposed oils, isolated from polluted river water and shore muds obtained from various locations, showed a direct proportionality between carboxylic acid content and time of exposure. Carboxylic acids were isolated by solvent extraction and studied by infrared spectroscopy. 相似文献
2.
Jumin Ellysia Basaruddin Faridah Bte Yusoff Yuzainee Bte. Md Latif Sarmad Dashti Ahmed Ali Najah 《Environmental science and pollution research international》2021,28(21):26571-26583
Environmental Science and Pollution Research - Reliable and accurate prediction model capturing the changes in solar radiation is essential in the power generation and renewable carbon-free energy... 相似文献
3.
Liew Juneng Mohd Talib Latif Fredolin T. Tangang Haslina Mansor 《Atmospheric environment (Oxford, England : 1994)》2009,43(30):4584-4594
The recurrence of forest fires in Southeast Asia and associated biomass burning, has contributed markedly to the problem of trans-boundary haze and the long-range movement of pollutants in the region. Air pollutants, specifically particulate matter in the atmosphere, have received extensive attention, mainly because of their adverse effect on people's health. In this study, the spatial and temporal variability of the PM10 concentration across Malaysia was analyzed by means of the rotated principal component analysis. The results suggest that the variability of the PM10 concentration can be decomposed into four dominant modes, each characterizing different spatial and temporal variations. The first mode characterizes the southwest coastal region of the Malaysian Peninsular with the PM10 showing a peak concentration during the summer monsoon i.e. when the winds are predominantly southerlies or southwesterlies, and a minimal concentration during the winter monsoon. The second mode features the region of western Borneo with the PM10 exhibiting a concentration surge in August–September, which is likely to be the result of the northward shift of the Inter Tropical Convergence Zone (ITCZ) and the subsequent rapid arrival of the rainy season. The third mode delineates the northern region of the Malaysian Peninsular with strong bimodality in the PM10 concentration. Seasonally, this component exhibits two concentration maxima during the late winter and summer monsoons, as well as two minima during the inter-monsoon periods. The fourth dominant mode characterizes the northern Borneo region which exhibits weaker seasonality of the PM10 concentration. Generally, the seasonal fluctuation of the PM10 concentration is largely associated with the seasonal variation of rainfall in the country. However, in addition to this, the PM10 concentration also fluctuates markedly in two timescale bands i.e. 10–20 days quasi-biweekly (QBW) and 30–60 days lower frequency (LF) band of the intra-seasonal timescales. These intra-seasonal fluctuations show strong seasonality with the largest fraction of variance occurring during the boreal summer and the weakest variance during the winter. Generally, the LF intra-seasonal oscillation is stronger compared to the QBW intra-seasonal band. 相似文献
4.
Mohd Talib Latif Sofia Aida Ngah Doreena Dominick Intan Suraya Razak Xinxin Guo Thunwadee Srithawirat Idris Mushrifah 《环境科学学报(英文版)》2015,27(7):143-155
The aim of this study was to determine the source apportionment of dust fall around Lake Chini, Malaysia. Samples were collected monthly between December 2012 and March2013 at seven sampling stations located around Lake Chini. The samples were filtered to separate the dissolved and undissolved solids. The ionic compositions(NO-3, SO2-4, Cl-and NH+4) were determined using ion chromatography(IC) while major elements(K, Na, Ca and Mg) and trace metals(Zn, Fe, Al, Ni, Mn, Cr, Pb and Cd) were determined using inductively coupled plasma mass spectrometry(ICP-MS). The results showed that the average concentration of total solids around Lake Chini was 93.49 ± 16.16 mg/(m2·day). SO2-4, Na and Zn dominated the dissolved portion of the dust fall. The enrichment factors(EF) revealed that the source of the trace metals and major elements in the rain water was anthropogenic, except for Fe. Hierarchical agglomerative cluster analysis(HACA) classified the seven monitoring stations and 16 variables into five groups and three groups respectively. A coupled receptor model, principal component analysis multiple linear regression(PCA-MLR), revealed that the sources of dust fall in Lake Chini were dominated by agricultural and biomass burning(42%),followed by the earth's crust(28%), sea spray(16%) and a mixture of soil dust and vehicle emissions(14%). 相似文献
5.
Parsaie Abbas Haghiabi Amir Hamzeh Latif Sarmad Dashti Tripathi Ravi Prakash 《Environmental science and pollution research international》2021,28(43):60842-60856
Environmental Science and Pollution Research - Predictions of pore pressure and seepage discharge are the most important parameters in the design of earth dams and assessing their safety during the... 相似文献
6.
不同碳源条件下草菇内切型纤维素酶基因(eg1)转录表达的分析 总被引:1,自引:0,他引:1
利用Northernblot方法分析了不同碳源条件下草菇切型纤维素酶基因(eg1)的表达.结果发现,在含有纤维素的液体培养基中生长10d,eg1在草菇菌丝中有高效表达;纤维二糖、α-乳糖、β-乳糖,也能诱导eg1的表达,但和纤维素相比,eg1的表达量相对较低,并且它们的诱导效应在加入这类糖12h后迅速减弱;槐糖和龙胆二糖的诱导作用非常弱.在天然稻草为基质的固体栽培料生长时,草菇eg1的表达和草菇菌丝生长与出菇相对应,在菌丝生长期(d8)可见eg1的表达,d12时菌丝已长满,表达减弱,在出菇及菇体的分化及增大期,eg1的表达量逐渐增强,在成熟期达到最高水平;表明在草菇菇体发育中需要更多碳源及能源的补充,eg1在这方面起着非常重要的作用.图4参14 相似文献
7.
Mulk Shahi Korai Abdul Latif Azizullah Azizullah Shahi Lubna Khattak Muhammad Nasir Khan 《Environmental science and pollution research international》2017,24(29):23039-23056
Environmental Science and Pollution Research - The present study was conducted to evaluate the impact of marble industry effluents on the accumulation of heavy metals in selected tissues of... 相似文献
8.
Latif Aref Amir H. Navarchian Daniyal Dadkhah 《Journal of Polymers and the Environment》2017,25(3):628-639
Poly(acrylamide-co-maleic acid)/montmorillonite nanocomposites, were synthesized via in situ polymerization with different maleic acid and MMT content. The capability of the hydrogel for adsorption of crystal violet (CV) was investigated in aqueous solutions at different pH values and temperatures. The pseudo-second-order kinetics model could fit successfully the adsorption kinetic data. The effects of maleic acid to acrylamide molar ratio (MAR), weight percent of MMT (MMT%), the pH of medium and the solution temperature (T) on the CV adsorption capacity (q e ) of adsorbents were studied by Taguchi experimental design approach. The results indicated that increasing the MMT% leads to a greater q e . The q e value of adsorbents increased also with increasing both MAR and pH, while reduced when the temperature of medium increased. The relatively optimum conditions to achieve a maximum CV adsorption capacity for P(AAm/MA)/MMT adsorbents were found as: 0.06 for MAR and 5 % of MMT%, medium pH = 7 and T = 20 °C. 相似文献
9.
A solid phase extraction method for the determination of gold(III) at trace levels by flame atomic absorption spectrometer
(FAAS) was developed. The method was based on retention of gold as chloro complexes through the Amberlite XAD-2000. The effect
of some analytical parameters including hydrochloric acid concentration, sample volume, sample and eluent flow rates, eluent
volume, eluent concentration and interfering ions on the recovery of gold(III) was investigated. The retention of gold(III)
from 1.5 mol l−1 HCl solution and the recovery of gold with 0.07 mol l−1 NH3 solution were quantitative (≥95%). The relative standard deviation (RSD) was calculated as 3.2% (n = 10). The detection limit for gold was 2 μg l−1. The accuracy was checked with the determination of gold spiked an artificial seawater and a pure copper samples. 相似文献
10.
During the 1980s Ethiopia experienced the effects of conflict, drought and famine on a scale far greater than many CPEs elsewhere. In May 1991, after the decisive defeat of the military dictatorship of Mengistu Haile Mariam by the Ethiopian Peoples' Revolutionary Democratic Front (EPRDF) and after decades of civil war, drought and famine, Ethiopia faced the prospects of peace and of much needed development. This paper explores both Ethiopia's experience of conflict and humanitarian intervention in areas of Tigray held by the Tigray Peoples' Liberation Front (TPLF) during the 1980s, and its experience of post-conflict rehabilitation and reconstruction in the 1990s. It first deals with the roots of the conflicts within Ethiopia: political marginalisation, heavy state intervention and highly extractive relations between state and peasants, inappropriate and failed development policies, ethnic identity and the politicisation of ethnicity. The Mengistu regime's counter-insurgency measures are then contrasted with the policies and programmes of the TPLF, Ethiopia's most effective opposition movement and the leading element in the EPRDF, and its achievements in mobilising popular support: its establishment of democratically elected structures of local governance and its famine relief distribution programme. 相似文献