Volume-7 ~ Issue-3 ~ March-2014

Abstract: This work is endeavor to explore the defluoridation capability of raw bentonites first time collected from the woods of Jharkhand hills without transferring neurotoxin aluminium to drinking water as compared with potash alum of Nalgonda technique (NEERI, Nagpur) now declared erroneous. These bentonites are found to have 76.67% of fluoride removal capacity which has been found to be much more than the fluoride removal capacity of raw bentonites reported till now. The kinetic study of defluoridation by Jharkhand bentonites of different particle size (mesh) revealed that as the particle size of Bentoniteis increased the fluoride removal capacity reduces. Samples AB6(Chitra), AB9(Godda), AB12(Godda), AB16(Godda) and AB17(Dumka)were able to reduce the fluoride concentration by 53.3%, 73.3%, 66.6% 56.6% and 76.3% respectively when used with mesh size of 300, while the same samples with mesh size of 150 had fluoride removal capacity of 0%, 33.3%, 43.3% , 43.3%, 33.3% respectively. Samples like AB10 (Sahibganj), AB18 (Dumka), AB19 (Dumka), AB21 (Daltaganj), AB22 (Lohardaga) and AB23 (Dumka) showed fluoride removal capacities from 56.6% to 76.6%. Bentonite, due to its three layered alumino silicate structure does not transfer aluminium to drinking water as potash alum of Nalgonda technique.
Key words: Nalgonda Potash alum, Drinking water, Raw Bentoniteof Jharkhand, Defluoridationcapacity, Neurotoxin.

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Abstract: The thermo-oxidative degradation of unstabilized and stabilized coatings of each of a saturated polyester and a poly (pentaerythritol-phthalate)based alkyd coatings separately pigmented with syncomine yellow 1630 have been studied. The test stabilizer was dibutyltin diethanoate employed at varying concentrations. The degradation of the coatings was monitored using color development, determination of gel content, stress–strain relationships, gloss retention and optical microscopy. The results showed that incorporating a concentration of 5 or 10 x 10-4 mole % of the tin ester can effectively stabilize both the polyester and alkyd coatings against thermo oxidative degradation.
Keywords: Polyester, alkyd, dibutyltindiethanoate, degradation, stabilizer,coating.

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Abstract: A rapid, simple,sensitive and selective direct spectrophotometric method has been developed for the determination of nickel(II) in various real samples. 5-Bromo-2-hydroxy-3-methoxy benzaldehyde-p-hydroxybenzoic hydrazone reacts with Ni(II) forming green coloured soluble complex [(Ni(II)-5-BHMBHBH] in basic buffer solution. The maximum absorbance was observed in the pH range 5.5-7.5 and Ni(II)-5-BHMBHBH shows at λmax at 440 nm. The method obeys Beer's law in the range 0.117 to 2.64 μg /ml. The molar absorptivity is 2.013×104 L mol-1 cm-1 and Sandell's sensitivity is0.0029mg/cm2. The standard deviation of the method for ten determinations of 0.6050 μg/ml of Ni(II) is 0.00256. The correlation coefficient (γ) of the calibration equation of the experimental data is 0.9999. The effect of various diverse ions is studied. The formula of the complex is 1:1 and its stability constant is 2.83×106. The method developed has been used for the determination of nickel(II) in alloy samples, drinking water, plant samples and in vegetable oil.
Keywords: Ni(II), Spectrophotometry, 5-Bromo-2-hydroxy-3-methoxy benzaldehyde-p-hydroxybenzoic hydrazine(5-BHMBHBH).

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