Determination of water in ascorbic acid by the proton isoconcentration technique using the standard addition method

✍ Scribed by M.R.O. Karim; Th.M. Karadaghi; S.O. Ismail

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 359 KB
• Volume: 8
• Category: Article
• ISSN: 0731-7085
• DOI: 10.1016/0731-7085(90)80069-2

✦ Synopsis

Water has been extracted from ascorbic acid into a dry mixture of equal volumes of methanol-organic solvents (n-propanol, ethylene glycol or propylene carbonate) and was determined potentiometrically, using the calibration graph based on the large and systematic change in cell potential for addition of 0-1%, m/m water into a dry mixture of the above mentioned mixture containing 2 x 10(-3) M trifluoromethanesulphonic acid (TFMSA) using a combination pH glass electrode with silver-silver chloride reference electrode having tetraethylammonium chloride (TEACl) in methanol as a filling electrolyte. The method is fast, accurate, reproducible and simple for operation.