Determination of potassium iodate sampled from sodium nitrate-potassium nitrate eutectic melts at 250.deg.C. by coulometric back-titration in aqueous medium

1968 ◽  
Vol 40 (8) ◽  
pp. 1375-1376 ◽  
Author(s):  
R. B. Fulton ◽  
H. S. Swofford
Keyword(s):  
Aqueous Medium ◽  
Sodium Nitrate ◽  
Potassium Nitrate ◽  
Potassium Iodate ◽  
Back Titration

Optical Determination of Thermal Conductivity with a Plane Source Technique

1968 ◽  
Vol 23 (1) ◽  
pp. 44-47 ◽  
Author(s):  
Silas E. Gustafsson ◽  
Nils-Olov Halling ◽  
Rolf A. E. Kjellander
Keyword(s):  
Thermal Conductivity ◽  
Steady State ◽  
Thermal Diffusivity ◽  
Sodium Nitrate ◽  
Molten Salts ◽  
Potassium Nitrate ◽  
Plane Source ◽  
Melting Points ◽  
Optical Determination

A recently developed plane source method for non-steady-state measurements of the thermal conductivity and thermal diffusivity of transparent liquids is now being applied to the study of molten salts. In these first measurements sodium nitrate and potassium nitrate have been investigated from their melting points to about 450°C. No temperature dependence of the thermal diffusivity can be established for either of the liquids, whereas the thermal conductivity in both cases increases very slowly with the temperature.A description of the experimental arrangement is included.

Infrared Determination of Inorganic Nitrates by the Pellet Technique; Infrared Determination of Two Inorganic Nitrates in the Presence of Each other

1970 ◽  
Vol 24 (2) ◽  
pp. 283-287 ◽  
Author(s):  
David E. Chasan ◽  
George Norwitz
Keyword(s):  
Quantitative Determination ◽  
Sodium Nitrate ◽  
Potassium Nitrate ◽  
Potassium Bromide ◽  
Barium Nitrate ◽  
Strontium Nitrate ◽  
Sodium Potassium

The quantitative determination of inorganic nitrates by the pellet technique was investigated. Methods are described for the determination of sodium, potassium, barium, and strontium nitrates. In these methods the nitrate is weighed into a small tared mortar, 300 mg of potassium bromide is added, the pellet is formed, and absorbances are determined at the appropriate peak. The peaks recommended for sodium, potassium, barium, and strontium nitrates are 836, 825, 730, and 737 cm−1, respectively. Methods are also proposed for the determination of two nitrates in the presence of each other. For the analysis of a mixture of sodium nitrate and potassium nitrate, measurements are made for sodium nitrate at 836 cm−1 and for potassium nitrate at 825 cm−1. For the analysis of a mixture of barium nitrate and strontium nitrate, measurements are made for barium nitrate at 730 cm−1 and for strontium nitrate at 737 cm−1. The methods for the determination of two nitrates can be used down to a ratio of 1 to 20. For lesser ratios the errors are rather large. Sulfates do not interfere with any of the procedures.

scholarly journals Validated Spectrophotometric Method to Assay of B6 and B3 Vitamins in Pharmaceutical Forms Using Potassium Iodide and Potassium Iodate

2015 ◽  
Vol 60 ◽  
pp. 113-119 ◽  
Author(s):  
Mouhammed Khateeb ◽  
Basheer Elias ◽  
Fatema Al Rahal
Keyword(s):  
Comparative Study ◽  
Aqueous Medium ◽  
Potassium Iodide ◽  
Spectrophotometric Method ◽  
Pharmaceutical Formulations ◽  
Potassium Iodate ◽  
Pyridoxine Hydrochloride ◽  
Iodide Ions ◽  
Significant Difference

A simple, precise and reliable spectrophotometric method for the determination of pyridoxine hydrochloride (vitB6) and nicotinamide (vitB3) in pure form and pharmaceutical formulations has been described. The method is based on the reaction of studied vitamin with a mixture of potassium iodide and potassium iodate in aqueous medium at (250.5oC) to form yellow colored tri iodide ions (I3-). The reaction is followed spectrophotometrically by measuring the absorbance at 290, 335 and 288, 350 nm for vitB6 and vitB3 respectively. Beer's law was obeyed in the range of 0.5-20.0 μg mL-1 for all procedures. Molar absorptivities were found to be 1.49×104, 1.93×104 and 0.89×104, 1.25×104 L mol-1 cm-1, for determination of vitB6 and vitB3 at 290, 335 and 288, 350 nm respectively. The proposed method has been applied to determine the components in commercial forms with no interference from the excipients. A comparative study between the suggested procedures and the official methods showed no significant difference between the two methods.

scholarly journals Titrimetric and spectrophotometric assay of diethylcarbamazine citrate in formulations using iodate and iodide mixture as reagents

2015 ◽  
Vol 51 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Nagaraju Swamy ◽  
Kudige Nagaraj Prashanth ◽  
Kanakapura Basavaiah
Keyword(s):  
Molar Absorptivity ◽  
Potassium Iodate ◽  
Spectrophotometric Methods ◽  
Accuracy And Precision ◽  
Ich Guidelines ◽  
Diethylcarbamazine Citrate ◽  
Back Titration ◽  
Bulk Drug ◽  
Reaction Stoichiometry

One titrimetric and two spectrophotometric methods are proposed for the determination of diethylcarbamazine citrate (DEC) in bulk drug and in formulations using potassium iodate and potassium iodide as reagent. The methods employ the well-known analytical reaction between iodate and iodide in the presence of acid. In titrimetry (method A), the drug was treated with a measured excess of thiosulfate in the presence of unmeasured excess of iodate-iodide mixture and after a standing time of 10 min, the surplus thiosulfate was determined by back titration with iodine towards starch end point. Titrimetric assay is based on a 1:3 reaction stoichiometry between DEC and iodine and the method is applicable over 2.0-10.0 mg range. The liberated iodine is measured spectrophotometrically at 370 nm (method B) or the iodine-starch complex measured at 570 nm (method C). In both methods, the absorbance is found to be linearly dependent on the concentration of iodine, which in turn is related to DEC concentration. The calibration curves are linear over 2.5-50 and 2.5-30 µg mL-1 DEC for method B and method C, respectively. The calculated molar absorptivity and Sandell sensitivity values were 6.48×103 L mol-1 cm-1 and 0.0604 µg cm-2, respectively, for method B, and their respective values for method C are 9.96×103 L mol-1 cm-1 and 0.0393 µg cm-2. The intra-day and inter-day accuracy and precision studies were carried out according to the ICH guidelines. The methods were successfully applied to the analysis of DEC formulations.

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