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- Author or Editor: B. Bhushan x
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Abstract
The equilibirum sorption capacity of hydrous ferric oxide and ferric phosphate has been observed to increase on irradiation with γ-rays by 5.2 and 6.6%, respectively. The rate of sorption increases differently in the irradiated exchanger materials depending upon their characteristics nature; e.g., when the concentration of the Zn(ammine) solution is 0.10M, increase in the F-values, caused by irradiation is significantly more striking in the case of hydrous ferric oxide than in ferric phosphate. On the other hand, at lower external concentration of the Zn(ammine) ion (0.01M), the increase in F-values is more significant in the case of ferric phosphate.
ESR technique was used to detect free radicals present naturally or formed after employing various food processing methods (irradiation, microwave roasting, pan frying and pounding) by entrapping small quantities of seed portions (seed coat and cotyledon) of Canavalia cathartica in potassium chloride powder in ESR quartz tubes. ESR signal at g=2.002 was more prominent in seed coat than the cotyledon. Application of ionising radiation (gamma and electron beam, 10 kGy) resulted in enhancement of signal at g=2.002 accompanied by a weak triplet (a H =3mT) in seed coat, which can be used as a suitable method of detection of irradiation. Some of the commonly employed food processing methods also generated free radicals (at g=2.002) more or less comparable to irradiation. Results of the present study might prove to be beneficial for the consumers who are interested to be acquainted with the status of free radicals in legumes after conventional or modern food processing and preservation methods.
Abstract
Kinetics of the exchange reaction of cadmium(II)-ammine complex ion using radio-active isotope115Cd in the same chemical form in hydrous oxides of zirconium(IV), silicon(IV) and tin(IV) has been studied. It has been found that the major contribution in the overall exchange process is from the surface of the exchanger particles. It has also been found that the rate of exchange follows the order: hydrous ZrO2>hydrous SnO2>hydrous SiO2
Abstract
A series of substituted triphenylphosphane complexes of the type CdL2X2 (L= triorthotolylphosphane or trimetatolylphosphane; X=Cl−, Br− or I−) and HgL2X2 (L=triphenylphosphane or triorthotolylphosphane) was prepared fresh. The thermal decomposition was carried out in air with heating rate programmed at 10�C min−1 and it revealed that the complexes with ortho derivative were less stable and the triphenylphosphane moiety leaves along with halogen in the first step. All the complexes were stable up to 210�C. However, the stability order of the tetrahedral complexes was X=Cl>Br. Values of n, E, lnA and ΔS # have been approximated and compared. Complexes having Br have higher E a, lnA and ΔS # values than that having Cl.
