NOPR Collection:

A sensitive colorimetric method for determination of chloroform

Wed, 01 Sep 1999 00:00:00 GMT

Title: A sensitive colorimetric method for determination of chloroform Authors: Pillai, Ajai K; Rastogi, Rachana; Gupta, V K Abstract: A sensitive colorimetric method for determination of chloroform in ppm level is described, which is based on modification of Fujiwara reaction i.e. colour development on treatment with pyridine and sodium hydroxide and discharging the colour with acetic acid and followed by addition of p-amino acetophenone reagent. The purple red colour formed has an absorpti on maximum at 520nm. Beer's law is obeyed in the range of 1.0 -10μg (0.1 to 1.0 ppm) of chloroform per 10mL of solution. The method is found to be free from interference of various copollutants. The sensitivity of the conventional Fujiwara procedure is increased after this modification. The method has been successfully applied for the determination of chloroform in various environmental and biological samples. Page(s): 294-296

A new method for high pressure epoxidation of unsaturated compound using molybdenumdisulphide as a catalyst

Wed, 01 Sep 1999 00:00:00 GMT

Title: A new method for high pressure epoxidation of unsaturated compound using molybdenumdisulphide as a catalyst Authors: Ratna, D; Banthia, Ajit K Abstract: The process for epoxidation of unsaturated compounds and polymers under high pressure was described. The epoxidized products were characterized by FTIR and ¹H NMR spectroscopy and analyzed for their epoxy yield and iodine value. The preliminary results show that high epoxy yield (~80 %) was obtained for oils and rubbers under high pressure. Page(s): 285-287

Synthesis and characterization of poly (ortho-anisidine) using quinolinium fluorochromate (QFC) [C₉H₇NH(CrO₃F)] as an oxidizing agent

Wed, 01 Sep 1999 00:00:00 GMT

Title: Synthesis and characterization of poly (ortho-anisidine) using quinolinium fluorochromate (QFC) [C₉H₇NH(CrO₃F)] as an oxidizing agent Authors: Dubey, Shipra; Singh, Dan; Misra, R A Abstract: Poly(o-anisidine) has been prepared using quinolinium fluorochromate C₉H₇NH[CrO₃F] (QFC) as an oxidizing agent and the polymer was obtained in good yield. The detailed electrochemical studies have been performed in the presence of QFC in aqueous and non-aqueous media. TG analysis exhibited that the synthesized polymers have relatively high thermal stability. Conductivity of the polymers was found in the range of 10^-9 to 10^-3 Scm^-1 and the magnetic susceptibility measurement show the paramagnetic behaviour. The study also include the structural elucidation and external morphological properties of the synthesized polymers. Page(s): 288-293

Flocculation of iron ore slimes from Joda and Kiriburu mines

Wed, 01 Sep 1999 00:00:00 GMT

Title: Flocculation of iron ore slimes from Joda and Kiriburu mines Authors: Bhagat, Ram Pravesh; Dey, Shobhana Abstract: The present paper reports the flocculation of iron ore slimes from Joda mines of TISCO and Kiriburu mines of SAIL situated in the west Singhbhum district of Bihar, India. These two slimes had marginal difference in density. The presence of clay minerals was more in case of Joda slimes. The settling rate following flocculation was measured as function of time. The effect of pulp density and flocculant dose at neutral pH was studied in the tests. The sedimentation rate increases with increasing flocculant dose up to a certain limiting value after which the improvement is marginal. The pulp density and flocculant dose have considerable effect on the settling rate. Joda slimes has poorer settling characteristics in comparison with Kiriburu slimes. The effect of pulp density and minerals present in these slimes are apparent from these observations. Page(s): 280-284

NOPR Collection:

A sensitive colorimetric method for determination of chloroform

A new method for high pressure epoxidation of unsaturated compound using molybdenumdisulphide as a catalyst

Synthesis and characterization of poly (ortho-anisidine) using quinolinium fluorochromate (QFC) [C9H7NH(CrO3F)] as an oxidizing agent

Flocculation of iron ore slimes from Joda and Kiriburu mines

Synthesis and characterization of poly (ortho-anisidine) using quinolinium fluorochromate (QFC) [C₉H₇NH(CrO₃F)] as an oxidizing agent