Sulfite (free)
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Methods
Visual Kits
Sulfite
Range: 2-20 ppm as SO
3
References: ASTM D 1339-84, Sulfite Ion in Water, Test
MDL: 2.0 ppm / Method: Iodometric
Method C. APHA Standard Methods, 20
th
ed., pp. 4-173,
Cat#
Method 4500-SO
2-
Sulfite Titrets Kit K-9602
3
B (1998). USEPA Methods for
Chemical Analysis of Water and Wastes, Method 377.1
Increments:
2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.6, 4.0, 5.0, 6.0, 7.0, 8.0, 10, 14, 20 ppm
(1983).
Kit comes in a cardboard box and contains everything needed to perform 30
Sulfite is not usually present in surface waters. If sulfite
tests: thirty ampoules with valve assemblies, Neutralizer Solution, titrettor,
25 mL sample cup, instructions, and MSDS.
is discharged in effluents or from domestic wastewaters,
it readily oxidizes to form sulfate. Sodium sulfite is the
Range: 5-50 ppm as SO
3
most common form of sulfite and is an excellent reduc- MDL: 5.0 ppm / Method: Iodometric
ing agent with applications as an oxygen scavenger.
Cat#
Sulfite concentrations in boiler and process waters must Sulfite Titrets Kit K-9605
be monitored routinely to avoid overtreatment. Waste
Increments:
treatment plants that use sulfur dioxide to remove
5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 9.0, 10.0, 12.5, 15.0, 17.5, 20.0,
25.0, 35.0, 50.0 ppm
excess chlorine must monitor their effluents for sulfite.
Kit comes in a cardboard box and contains everything needed to perform 30
CHEMetrics’ sulfite test kits employ the iodometric
tests: thirty ampoules with valve assemblies, Neutralizer Solution, titrettor,
25 mL sample cup, instructions, and MSDS.
chemistry in which sulfite is titrated with iodide-iodate
titrant in an acid solution using a starch indicator.
Range: 10-100 ppm as SO
3
Thiosulfate will titrate as sulfite. Results are expressed
MDL: 10 ppm / Method: Iodometric
as ppm (mg/L) SO
3
.
Cat#
Sulfite Titrets Kit K-9610
Sulfite in Wine
Increments:
References: ASTM D 1339-84, Sulfite Ion in Water, Test
10, 11, 12, 13, 14, 15, 16, 18, 20, 25, 30, 35, 40, 50, 70, 100 ppm
Method C. APHA Standard Methods, 20
th
ed., pp. 4-173,
Kit comes in a cardboard box and contains everything needed to perform 30
tests: thirty ampoules with valve assemblies, Neutralizer Solution, titrettor,
Method 4500-SO
2-
3
B (1998). USEPA Methods for
25 mL sample cup, instructions, and MSDS.
Chemical Analysis of Water and Wastes, Method 377.1
(1983). Range: 50-500 ppm as SO3
MDL: 50 ppm / Method: Iodometric
Sulfites have been used for centuries to sanitize and
Cat#
preserve foods. They are used worldwide in the wine
Sulfite Titrets Kit K-9650
industry as antioxidant and antimicrobial agents.
Increments:
However, sulfites have been identified as causative
50, 55, 60, 65, 70, 75, 80, 90, 100, 125, 150, 175, 200, 250, 350, 500 ppm
agents in certain allergic reactions suffered by asthmat-
Kit comes in a cardboard box and contains everything needed to perform 30
ics. As a result, the FDA and the Bureau of Alcohol,
tests: thirty ampoules with valve assemblies, Neutralizer Solution, titrettor,
25 mL sample cup, instructions, and MSDS.
Tobacco, and Firearms have mandated that sulfites in
foods and beverages, at levels of 10 ppm or higher, be
identified on the label.
CHEMetrics’ sulfite test kit is based on the Ripper
method, which the wine industry has used for years as a
standard for rapid sulfite analysis. Sulfite is titrated
with an iodide-iodate solution, using a starch end point
indicator. Phosphoric acid is used to adjust the pH of the
sample. Results are quantified using direct-reading
titration cells. The test determines free sulfite as ppm
(mg/L) SO
2
.
Results for this test kit are acceptable for dry white
wines (although they can have an error of up to 10
ppm). This test kit is not recommended for use with red
wines or white wines containing ascorbic acid or tannin.
These wines often give false high test results.
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