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Total Sulfite in Cellulosics by Ion Exclusion Chromatography with Electrochemical Detection
Author(s) -
REIM ROBERT E.
Publication year - 1991
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1991.tb14646.x
Subject(s) - sulfite , chromatography , chemistry , reproducibility , detection limit , extraction (chemistry) , ion chromatography , distillation , sodium sulfite , electrochemistry , size exclusion chromatography , sodium , electrode , inorganic chemistry , organic chemistry , enzyme
Total sulfite at concentrations ≦ 50 ppm was determined in commercially available thixotropic materials based on methylcellulose (MC) and hydroxypropylmethylcellulose (HPMC) by extraction into an alkaline solution of 5% (w/v) Na 2 SO 4 and subsequent separation by anion exclusion chromatography and electrochemical detection. Results were compared to those obtained by Monier‐Williams distillation which was shown to suffer from low recovery, poor reproducibility and false positive response. Mean sulfite recovery, added at concentrations of 10–50 ppm SO 2 was 91 ± 11% based on 12 determinations. Analysis time for the chromatographic method was < 25 min/determination. Aldehydes did not interfere at concentrations < 100‐fold excess.