Critical Comparison between Modified Monier-Williams and Electrochemical Methods to Determine Sulfite in Aqueous Solutions | Zendy

Cristina Montes | Zendy; J. H. Vélez | Zendy; Galo Ramı́rez | Zendy; Maurício Isaacs | Zendy; Roxana Arce | Zendy; Marı́a J. Aguirre | Zendy

Open Access

Critical Comparison between Modified Monier-Williams and Electrochemical Methods to Determine Sulfite in Aqueous Solutions

Author(s) -

Cristina Montes,

J. H. Vélez,

Galo Ramı́rez,

Maurício Isaacs,

Roxana Arce,

Marı́a J. Aguirre

Publication year - 2012

Publication title -

the scientific world journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.453

H-Index - 93

eISSN - 2356-6140

pISSN - 1537-744X

DOI - 10.1100/2012/168148

Subject(s) - sulfite , aqueous solution , chemistry , sulfite oxidase , differential pulse voltammetry , electrochemistry , analytical chemistry (journal) , inorganic chemistry , cyclic voltammetry , chromatography , organic chemistry , electrode

In the present work, known concentration of sulfite aqueous solutions in the presence and absence of gallic acid was measured to corroborate the validity of modified Monier-Williams method. Free and bound-sulfite was estimated by differential pulse voltammetry. To our surprise, the modified Monier-Williams method (also known as aspiration method) showed to be very inaccurate for free-sulfite, although suitable for bound-sulfite determination. The differential pulse approach, using the standard addition method and a correction coefficient, proved to be swift, cheap, and very precise and accurate.

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