An on-line potentiometric sequential injection titration process analyser for the determination of acetic acid.
An on-line potentiometric sequential injection titration process analyser for the determination of acetic acid is proposed. A solution of 0.1 mol L(-1) sodium chloride is used as carrier. Titration is achieved by aspirating acetic acid samples between two strong base-zone volumes into a holding coil and by channelling the stack of well-defined zones with flow reversal through a reaction coil to a potentiometric sensor where the peak widths were measured. A linear relationship between peak width and logarithm of the acid concentration was obtained in the range 1-9 g/100 mL. Vinegar samples were analysed without any sample pre-treatment. The method has a relative standard deviation of 0.4% with a sample frequency of 28 samples per hour. The results revealed good agreement between the proposed sequential injection and an automated batch titration method.
van Staden
J F
JF
Department of Chemistry, University of Pretoria, South Africa. Koos.vanStaden@chem.up.ac.za
Mashamba
Mulalo G
MG
Stefan
Raluca I
RI
D019342:Acetic Acid / Q000032:analysis* / Q000737:chemistry*; D017022:Flow Injection Analysis / Q000379:methods*; D011199:Potentiometry / Q000379:methods*; D015203:Reproducibility of Results; D012972:Sodium Hydroxide; D017186:Titrimetry / Q000379:methods*
D012972:Sodium Hydroxide; D019342:Acetic Acid