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A study of the graft copolymerization of acrylonitrile into bleached sulphonated jute-cotton blended fabric, using KMnO4/H2SO4 redox-initiator system has been made.The polymerization reaction was studied with the respect to graft yield, graft efficiency and homopolymer. Optimization of varios parameter of grafting viz. time, temperature, initiator, sulphuric acid and monomer concentration was carried out. Grafting has improved the light fastness of bleached sulphonated jute-cotton blended fabric with basic dyes. More than 13.5% graft yield could be achieved in the present investigation. read more
D A BAGUM ,F I FAROOQUI ,M A SALAM ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 71
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The relation for the free energy of micellization in case of ionic a well a nonionic safectants has been updated by including the effect of ionic strength and the size of the ions used. For the verification of the final relation and to compare the results one gets through differed techniques like viscometry, light absorption\transmission, surface tension and conductance have been employed to determine critical micelles concentration (CMC) of sodium dodeoyl sulphate and sodium tetradeoyl adphde safactanta It is found that when the electrolyte concentration is very low the viscometry does not give reliable results where a light absorption/transmission does. The surface tension measurement and conductance measurement give reliable and reproducible results at any electrolyte concentration and temperature. A new way of interpretation of conductivity data has also been proposed, through which one can get better remits even in the presence of high ionic strength. The results no obtained show the decrease in CMC with the increase in electrolytes concentration andapproaches to a constant value. This decrease is in the order of Na+>K+> Li+ . This trend isexplained in terms of change in shape of the micelles, specific absorption of electrolytes, variation in double layer thickness and hence variation in the free energy of the system and hydrodynamic radius of the ions used. It is also found that the CMC decreases with the increase in temperature of the system, which is explained in terms of solubility of thesurfactants, change in shape of the micelles and free energy of the system with the temperature. Further these variation are in accordance with the equation derived by us. read more
G HAMEED ,A BANO ,M K BALOCH ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 77
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Ground water samples from existing wells in different agricultural farms of Malir Valley Karachi (Pakistan) were collected and analyzed for chemical constituents viz. Na, K, Ca, Mg, CO3, HCO3, C1 and SO4 along with -their physical properties. The values of total dissolved salts (TDSL odium adsorption ratio (SAR), resident sodium carbonate (RSC) and exchangeable sodium percentage (ESP) of the samples were then calculated to investigate their Irrigation chemistry. Inspire of high values of TDS, 70,90 and 100% samples were found to be safe with respect to their SAR, ESP & RSC values respectively. Sodium percent (Na%) of 30% samples was found to be good where 50% were in permissible range from irrigation point of view. The overall results show that the underground water of Malir Valley can suitably be med for irrigation purpose. read more
M I QAIMNKHANI ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 86
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Adsorption of silver on bentonite has been studied by using batch-technique, Distribution Co-officient (Kis) were determined for bentonite silver solution system in natural water as a faction of contact time,pH, adsorbent & adsorbate concentration and temperature. Adsorption data have been interpreted in terms of Freundlich and Langmuir equations. Thermodynamics parameters for the adsorption have been determined at three temperatures. The value of DH* = -3.62 KJ/mol and DG* = 3.61 KJ/mol at 298K suggests that the adsorption of silver on bentonite is an exothermic percent De desorption studies at low given silver loading on bentonite shows that significant %age d the element is irreversiblyadsorbed due to the fixation of the silver by isomophous replacement in the crystal lattice of the adssorbent.read more
S NAEEM ,U ZAFAR ,F JAMSHED ,I KHAN ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 92
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Activated carbon fibre / filament (ACF) has been prepared from different cellulonic precursors by chemical activation method, using zinc chloride and phosphoric acid as activating agents. It has been found that adsorptivity capacity of zinc chloride activated ACF produces was better than phosphoric acid activated ions. It has also been inferred that all ACF products have microporous structure having absence of meso and macropores. An ACF product of reasonable activity and having good strength characteristics may be prepared by zinc chloride activation of bleached cotton cloth.read more
T H USMANI ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 98
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Role of activators such a sodium silicofluoride and sulfuric acid in bright chrome electroplating was investigated using technical grade chromic acid, CrO3, containing 0.15% sulfate, maximum. It was found that beth comprising CrO3 300-350 Na2SiF6 2-3 g/L, H2SO4 1-2 ml/L at temperature 30-35 C and current density 8-10 A/dm2 can be recommended as a self one for bright chrome plating.read more
A KHAN ,I SADIQ ,INAM UL HAQUE ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 102
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Textile affluent is one of the major sources of pollution in the Kabul River at the North-West Frontier Province of Pakistan. Effluent sample from individual processes of a textile mill at Now where were chemically evaluated for organic strength, total solids, trace toxic metals and other common pollutants. the results have shown different parameters to be in the range; temperature 32-130'C, pH 8.05-11.38, electrical conductivity 400-16160 µ mhos/cm. Total solid, which were measured g 105°C, 180°C and 550°C were respectively in the range of 460-18080 mg/l, 250-1613 mg/l and 240-14460 mg/l. Total dissolved solids at 105 C, 180°C and 550°C were found in the range of 360-1506 mg/l, .220-13430 mg/l and 210- 12740 mg\l respectively. Whereas, total suspended solids at these temperatures were found to be in the range of 100-3020 mg/l, 30-1670 mg/l and 3(k1030 mg/l respectively. Chemical oxygen demand was in the range of 1500-4160 mg O2/L Total hardness was 70-290 mg/1, calcium 0-60 mg/l, magnesium 50-230 mg/1, medium 40-3286 mg/l, potassium 12-236 mg/l, chloride 29-1918 mg/l, sulphate 529-2991 mg/l and sulphide 608-1832 mg/l. Trace toxic metals were found in the ranges; copper 0.04-0.17 mg/l, cadmium 0-0.16 mg/l, ciromium 0.5- 0.8 mg/l, nickel 04.04 mg\l, lead 0.07-0.14 and manganese 0.01-0.11 mg/l. It was concluded that the textile industry under study discharges various pollutants in concentratiom that are above the permissible limits laid down by the national and international standards. The textile effluents contain toxic metals, high oxygen demanding wastes and appreciable among of sulphide. this study also indicates the presence and the deleterious effects of industrial pollutants in general and sulphide in particular, as alarmingly high concentration of sulphide (608 times higher than the permissible limit) being discharged into Kabul River. this could logically be linked with the substantial decrease in fish crop specifically at and down-stream of the discharging point, and overall reduction in fish population in the Kabul River.read more
MAAL ABRAR ,Z HUSSAIN ,M AKIF ,K SOK ,A MUHAMMAD ,A R KHAN ,M I N ,M KHAN ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 106
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Phosphate adsorption from soil as a function of pH and temperature, using electrolyte and ion exchange resin methods, ha been studied. The resin method is found to be the most suitable method for the extraction of phosphate from the soil. Low pH values and high temperature was observed to enhance the phosphate adsorption which is due to an increase in the solubility of calcium phosphate.read more
F FARINA ,A NAEEM ,S Y HUSSAIN ,S MURTAZA ,S MUSTAFA ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 112
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Mianserin reacts with alizarin sulfonic acid (sodium Salt) to give a reddish yellow colour having maximum absorbance at 520 nm. The reaction is specific for Mianserin with 1 µg/10 ml as visual limit of quantization, and provides a basis for a new spectrophotometric determination. The colour reaction obeys Beer's Law from 0.001 µg to 3.5 µg/10 ml of Mianserin. De relative standard deviation is < 0.2%. The method is successfully applied to pure and pharmaceutical dosage forms of Mianserin. The quantitative assessment of tolerable limits of other drugs not interfering are also studied.read more
I I KAZI ,T AMAN ,Z A KHAN ,I U KHAN ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 114
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Vitamin K3 (menadione sodium hydrogen sulphite) was indirectly determined by the reduction of the iron (III) to iron(II) and an intense blue color formation by the reaction of iron(II) and 2,4,642'-pyridyl)-e4riazine (TFTZ). The color development was monitoredspectrophotometerically at 595 ma with linear calibration range with 2-10 µg/mi of vitamin K3 The method was used for the determination of vitamin K3 in a pharmachemical preparation A single lined flow injection manifold was also examined. A large excess of iron(III) containing different concentration of vitamin K was run, on the line and a constant amount of TPTZ was injected through the injector. The peak height was proportional to concentration between 2-10 µg/ml vitamin K3.read more
F M A RIND ,S A MEMON ,MUHAMMAD Y KHUHAWAR ,
- 02 May 2011
- Volume Detail: VOLUME 24, NO2, JUN 2002
- Pages: 119
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