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Articles by M. Halimah
Total Records ( 2 ) for M. Halimah
  B.S. Ismail , M. Sameni and M. Halimah
  Pesticide adsorption and desorption are important processes that influence the amount of pesticide retained in the soil matrix and its subsequent movement in the soil profile. A study was made on the adsorption-desorption and mobility of the herbicide 2,4-D (2,4-dichlorophenoxyacetic acid) in two ricefield soils in the Kerian district, located in the state of Perak, North West Malaysia. Adsorption studies were conducted using the batch equilibrium technique and mobility was studied using a soil column under laboratory conditions. The adsorption and desorption studies fit the Freundlich equation, the adsorption coefficient (Kd) of the clay loam and clay soils were 33.83 and 18.12 L kg-1 and the 1/nads values were found to be lower than unity. The total percentage desorption from the clay loam and clay soils after the fourth desorption process was 18.31 and 28.33%, respectively. Complete leaching of the chemical through the soil column was not observed under the conditions of the present study, as the chemical was not detected in the leachate. The total amount of 2,4-D found in the clay loam and clay soil columns were 66.96 and 72.28% with 5 mm of simulated rainfall per day. The results obtained indicate the importance of organic matter in adsorption-desorption and mobility of 2,4-D in the Malaysian soils studied.
  Mehdi Sameni , B.S. Ismail and M. Halimah
  The aim of this study was to investigate the sorption kinetics and effects of pH, concentration and temperature on the adsorption of 2,4-D onto soil. Two types of Malaysian ricefield soils were used for this study; namely clay loam and clay soil obtained from the Kerian ricefields in Perak. Agriculture in North West Malaysia relies on the widespread use of herbicides to promote crop performance. Over-application of many herbicides is commonplace, however and may compromise soil and water quality and ultimately human health, within the region. Adsorption experiments were conducted using a batch equilibration technique. The HPLC-UV were used to detect 2,4-D residues in the supernatant. Adsorption equilibrium time was achieved within 2 and 4 h for the clay loam and clay soils, respectively. The percentage of 2,4-D adsorption onto soil was found to be higher in clay loam than in clay soils. Results of the study demonstrated that adsorption of 2,4-D in both soil types was higher at low pH and with increased pH the adsorption decreased. Likewise, the adsorption of 2,4-D was found to be sensitive to temperature, with low temperature significantly increasing the adsorption capacity of the soil. Results also suggested that 2,4-D sorption by soil is concentration dependent.
 
 
 
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