Determination of sulfurous acid in liquids and an apparatus ther

Details Determination of sulfurous acid in liquids and an apparatus ther Determination of sulfurous acid in liquids and an apparatus ther

1983-07-06

1985-11-19

Lacey, David L.

Chemistry: analytical and immunological testing

Inorganic acid or base

Sulfur containing

7386301, 7386302, 222 56, 422 62, 422 68, 422 75, 436 43, 436 51, 436 55, 436163, G01N 3300, G01N 3316

Patent

active

045542554

ABSTRACT:
A method and an apparatus providing a simple and speedy determination of a slight amount of sulfurous acid contained in liquids by means of pH meters, based on the Modified Rankine's method in principle, and wherein the pH of a first sample of liquid is determined before and after adding an amount of hydrogen peroxide thereto, the pH of a second sample of liquid is determined before and after adding an amount of an acid or lower pH buffer solution thereto, and the concentration of sulfurous acid in the liquid is calculated from the measured pH values and an equation derived from the functional relationship:

REFERENCES:
patent: 1084658 (1914-01-01), Pearson
patent: 3117954 (1964-01-01), Hupfer
patent: 3660035 (1972-05-01), Marsh
patent: 3717435 (1973-02-01), Erty et al.
patent: 3870466 (1975-03-01), Rellstab et al.
patent: 3987153 (1976-10-01), Stiles
patent: 4026665 (1977-05-01), Mansfield et al.
Grant, Hackh's Chemical Dictionary, 1969, Frontispiece and p. 115.
"New Method for Determining Sulphur Dioxide in Wine", B. C. Rankine, Aust. Wine, Brew., Spirit Rev. vol. 80, pp. 14-15, (1962).
"Establishment of a Modified Rankine Method for the Separate Determination of Free and Combined Sulfites in Foods", by K. Fujita et al., published in Z. Lebensm. Unters. Forsch, vol. 168, pp. 206-211, (1979).

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