![]() The higher value of time tE means insulating system of Ex e motor is able to withstand the locked condition for long time so motor will be more safe for long duration during in specified abnormal condition in hazardous area. The motor time tE for increased safety motor is prime safety parameter. Increased safety (Ex e) High Tension (HT) squirrel cage induction motors are being designed for safe operation in the explosive atmospheres. Title : Some methods to increase the time tE of increased safety Ex e motor for explosive atmospheresÄr. The methodology was applied for determination of Mo(II) in natural water samples and satisfactory results were obtained. Validation of the developed method was performed using certified reference material (TMDA-53.3). HNO3 was used as eluent and maximum preconcentration factor was found to be 200.Elution parameters were also determined as 4 mL min-1 0.6 mol L-1 and 5.1 mL forflow rate, eluent concentration and eluent volume, respectively.Limit of detection and limit of quantification were found to be 49.6 and 163.7 ng L-1, respectively. The analytical features for sorption were found to be 5.2 4.3 mL min-1 and 55.0 mL for pH, flow rate and sample volume, respectively. Flame atomic absorption spectrometer was utilized for determination of Mo(II). The analytical variables were optimized by central composite design (CCD). The modified Graphene oxide (GO-H2P) was used for preconcentration of Mo(II) from aqueous solutions. ![]() ![]() In this paper, a Graphene oxide with covalently linked porphyrin (GO-H2P) based new sorbent was prepared. ![]() A simple, highly sensitive, accurate and selective method for determination of trace amounts of Mo2+in water samples. ![]()
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