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601.
Rifaqat Ali Khan Rao Mohammad Ajmal Bilquees Ata Siddiqui Shamin Ahmad 《Environmental monitoring and assessment》1999,54(3):289-299
Aromatic amines were analysed by normal phase and reverse phase high performance liquid chromatography employing silica gel and octadecyl silane (ODS) columns, respectively. A number of mobile phases were used. The results obtained on silica gel column were compared with those achieved on reverse phase column. Excellent results were obtained on ODS and shoulder peaks were eliminated when a mixture of methyl alcohol and sodium perchlorate was used as mobile phase. 相似文献
602.
Wenjing Lu Yawar Abbas Muhammad Farooq Mustafa Chao Pan Hongtao Wang 《Frontiers of Environmental Science & Engineering》2019,13(2):30
603.
Kolangare Irfana Moideen Isloor Arun Mohan Karim Zulhairun Abdul Kulal Ananda Ismail Ahmad Fauzi Inamuddin Asiri Abdullah Mohamed 《Environmental Chemistry Letters》2019,17(1):581-587
Environmental Chemistry Letters - The removal of toxic dyes from the wastewater and industrial effluents is a major environmental challenge. Various techniques have been employed for the removal of... 相似文献
604.
This study was conducted to biologically treat wastewater discharged from the textile industry (textiles made of cotton and/or synthetic fiber) using sequencing batch reactor (SBR) technology (activated sludge process operating on batch mode). To achieve the objectives of the study, the characteristics of textile wastewater and the biodegradation of its organic constituents under unsteady state conditions were studied. Then, a bench-scale pilot plant was used to study the performance of SBR by monitoring the settleability and change in the constituents (chemical oxygen demand and solids) over time. Results of the study showed that textile wastewater has different types of pollutants: heat, basicity, suspended solids, organic and inorganic matter, and heavy metals. The factors affecting the biodegradation of organic matter were determined as the reaction time and the ratio of initial substrate to sludge concentrations. Also, removal of solids was monitored, and the settling velocity as affected by sludge concentration was graphically presented to enable the determination of settling time. Finally, the outcome of this study was used to suggest a procedure for the design of a full-scale SBR unit for treatment of textile wastewater. 相似文献
605.
Transformation of nitrogen dioxide into ozone and prediction of ozone concentrations using multiple linear regression techniques 总被引:1,自引:0,他引:1
Nurul Adyani Ghazali Nor Azam Ramli Ahmad Shukri Yahaya Noor Faizah Fitri MD Yusof Nurulilyana Sansuddin Wesam Ahmed Al Madhoun 《Environmental monitoring and assessment》2010,165(1-4):475-489
Analysis and forecasting of air quality parameters are important topics of atmospheric and environmental research today due to the health impact caused by air pollution. This study examines transformation of nitrogen dioxide (NO2) into ozone (O3) at urban environment using time series plot. Data on the concentration of environmental pollutants and meteorological variables were employed to predict the concentration of O3 in the atmosphere. Possibility of employing multiple linear regression models as a tool for prediction of O3 concentration was tested. Results indicated that the presence of NO2 and sunshine influence the concentration of O3 in Malaysia. The influence of the previous hour ozone on the next hour concentrations was also demonstrated. 相似文献
606.
Zulfiqar Ahmad Gulraiz Akhter Arshad Ashraf Alan Fryar 《Environmental monitoring and assessment》2010,170(1-4):395-406
A three-dimensional contaminant transport model has been developed to simulate and monitor the migration of disposal of hydrocarbon exploration produced water in Injection well at 2,100 m depth in the Upper Cretaceous Pab sandstone, Bhit area in Dadu district of Southern Pakistan. The regional stratigraphic and structural geological framework of the area, landform characteristics, meteorological parameters, and hydrogeological milieu have been used in the model to generate the initial simulation of steady-state flow condition in the underlying aquifer’s layers. The geometry of the shallow and deep-seated characteristics of the geological formations was obtained from the drilling data, electrical resistivity sounding surveys, and geophysical well-logging information. The modeling process comprised of steady-state simulation and transient simulation of the prolific groundwater system of contamination transport after 1, 10, 30 years of injection. The contaminant transport was evaluated from the bottom of the injection well, and its short- and long-term effects were determined on aquifer system lying in varying hydrogeological and geological conditions. 相似文献
607.
Understanding of groundwater salinity using statistical modeling in a small tropical island,East Malaysia 总被引:1,自引:0,他引:1
Sarva Mangala Praveena Mohd Harun Abdullah Kawi Bidin Ahmad Zaharin Aris 《The Environmentalist》2011,31(3):279-287
This paper presents an understanding of groundwater salinity by identification of effective factors using chemometric methods
(cluster analysis and multiple linear regressions) in Manukan Island, Sabah. Local groundwater and environmental properties
were used to explore the effective factors of groundwater salinity. Cluster analysis showed salinity and chloride illustrated
the highest similarities. Electrical conductivity and total dissolved solids were also grouped in the same cluster. Seawater
is the only chloride source in groundwater of Manukan Island demonstrated an indication of seawater mixing in freshwater.
It is an effect of upward movement of the seawater by pumping activities. Precipitation and evapotranspiration (environmental
condition) with hydraulic heads were clustered together to show that they also influence salinity concentration in groundwater.
Multiple linear regressions showed descending order of the factors from chloride (the largest contribution) to evapotranspiration
(the smallest contribution) and illustrated the contribution to groundwater salinity in Manukan Island. The integrated results
using chemometric methods have provided a way to identify the effective factors on groundwater salinity. This similar approach
and resulting equation can be applied in other small tropical islands with alike hydrogeological condition and limited information
available for a better understanding of its groundwater salinity. 相似文献
608.
Mohd Talib Latif Siti Zawiyah Azmi Ahmad Daud Mohamed Noor Aida Shafawati Ismail Zaharizam Johny Shaharudin Idrus Ahmad Fariz Mohamed Mazlin Bin Mokhtar 《The Environmentalist》2011,31(3):315-324
Studies of air quality were carried out in the towns of Kajang, Nilai and Banting in the Langat River Basin, southern region of Kuala Lumpur to determine the status and trend of air quality. The determination of air quality was based on several parameters such as suspended solids with diameters less than 10???m (PM10) and gaseous pollutants of sulphur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), and carbon monoxide (CO). Primary concentration data of air pollutants were compiled through fieldwork studies and combined with secondary data obtained from the regular monitoring data as collected by Alam Sekitar Malaysia Sdn. Bhd. (ASMA) on behalf of Malaysian Department of Environment (DOE) at their stations in Kajang and Nilai. Results showed that the average concentrations of PM10, SO2, NO2, O3, and CO at all sampling stations were still below the permissible values recommended by the Malaysian DOE. The level of gaseous pollutants of NO2, O3, and CO was recorded at statistically higher levels (p?<?0.05) than values recorded at the control station at Pangsun Recreational Area. These pollutants were suspected to have originated mainly from exhaust systems of motor vehicles. Data for the years 1996 to 2006 as obtained from ASMA showed long-term air quality trends of increasing O3 and NO2 concentrations in Kajang whilst concentrations of PM10 recorded at both Kajang and Nilai stations were mostly expected coming from transboundary sources especially biomass burning and the development activities around the study areas. 相似文献
609.
Yadav S Irfan M Ahmad A Hayat S 《Journal of environmental biology / Academy of Environmental Biology, India》2011,32(5):667-685
Salinity in agricultutal terms is the excess of salts above the level plant require. Most often it poses constrains in the growth hence productivity of the category of plants called glycophytes, wherein falls major crops, therefore is a serious concern. It is often recognized as excess of sodium ions (sodicity) that imparts life threatening consequences in plant due to mal-textured soil hindered porosity and aeration leads to physiological water deficit. Mingling with other edaphic/environmental factors viz. precipitation, temperature, flooding, soil profile, water table exaggerates the catastrophe synergistically. Improper irrigations system, leaching fraction added with land clearing and deforestation have been marked as the major cause. The present review underlines the different sources of salinity stress and their physiological manifestations, toxicity responses alongwith tolerance in plants and management strategies in affected landscapes. 相似文献
610.
Farooq S Hashmi I Qazi IA Qaiser S Rasheed S 《Environmental monitoring and assessment》2008,140(1-3):339-347
The present study was undertaken to examine the drinking water quality of Rawal Treatment Plant, Rawalpindi and its distribution
network by collecting samples from eight different locations. The aim was to determine potential relationship between the
presence of microorganisms and chlorine residual in the distribution network. Quantification of chlorine residual, turbidity,
standard plate count (SPC), fecal and total coliforms by Most Probable Number (MPN) was performed. Three different forms of chlorine were measured at each sampling station such
as free chlorine, residual chlorine, chloramines and total chlorine residual. A critical evaluation of data presented indicated
that pH generally ranged from 7.02–7.30; turbidity varied from 0.34–2.79 NTU; conductivity fluctuated from 359–374 μS/cm;
and TDS values were found to be ranging between 180–187 mg/l. Station # 7 was found to be most contaminated. The value of total chlorine was found to be 0.86 to1.7 mg/l at Station # 3 and 6, respectively. Highest standard plate count was 62 CFU/ml at Station # 7. Total
coliforms were less than 1.1 MPN/100 ml at almost most of the stations except at Station # 3 where it was found to be greater than 23.0 MPN /100 ml. Overall aim of this study is to create awareness about contamination
of drinking water in the water distribution networks and to make recommendations to provincial agencies such as EPA, CDA and
WASA that regular monitoring should be carried out to ensure that the chlorine residual is available at consumer end. 相似文献