Question 1

Can these strips be used to test for urinary sulfite levels?

Accepted Answer

No, these strips are not intended for testing urine.

Question 2

Do they test free or total sulfites?

Accepted Answer

This is for free sulfite. The method to test for total requires a hazardous chemical that is not supplied with the strip and it is not recommended to be done by non professional.

Question 3

Does this sulfite test strip works to test the sulfite level red wine without being buffered with solid sodium acetate prior to testing?

Accepted Answer

Please see below information regarding testing sulfite levels in wine. 
Detection of Sulfite in wine and juices 
 with QUANTOFIX® Sulfite 
     
Background

Since ancient times humans have used sulfite SO32- and sulfur dioxide as antioxidants and preservative agents in wine and juices. Sulfite prevents the growth of microorganisms and the modification through oxygen.
 The human organism is generally accustomed to sulfite, but high quantities may cause diarrhea, nausea and headache. 
 The German directive for juices "Verordnung über Fruchtsaft..." allows a  maximum value of 10 mg/l for sulfur dioxide.
 According to the German directive for wine, wine is divided in white wine and red wine. For white wine with less than 5 g residual sugar per liter a maximum quantity of 210 mg/l sulfur dioxide is allowed. 
 Red wine may have a maximum value of 160 mg/l sulfur dioxide.
 Since the 25th November 2004 the directive "VO (EG) 1991/2004" is effective. According to this, every wine bottle must be labeled with the addition "contains sulfite" or "contains sulfur dioxide".
 Humans who react allergic to sulfite should make a sulfite test.

Test procedure

Free sulfite:
 Fill a glass with sample. Red wine and dark juice should be filtered using activated charcoal paper (e.g. MN 7281)) to avoid false high readings caused by the intense solor of the sample. Dip the test strip into the liquid for one second. Wait 30 seconds and compare the test field with the color scale on the tube. Multiply the reading with 1.5 to get the result for the SO2 content. A salmon coloration indicates the presence of free sulfite in wine or juices.

For the elucidation of the currant juice filter with activated charcoal paper. 
  Dip the test strip 1 second into the juice.  Compare the test field with the color scale on the tube.

Total sulfite:
 Give wine or juice into a glass. Filter dark juice and wine before with activated charcoal paper (e.g. MN 7281)). Add sodium hydroxide1) to the sample and bring it to pH=12. Check the pH value with pH-Fix 0-14 PT1) (REF 92111). Dip the QUANTOFIX® Sulfite test strip into the sample for one second. Wait 30 seconds and compare the test field with the color scale on the tube. A salmon coloration detects total sulfite.

Add sodium hydroxide1) to the white wine and mix it.  Check the value pH=12 with pH-Fix 0-14 PT1).  Dip sulfite test strip into sample for 1 second and compare it with color scale.

Product data and ordering information: QUANTOFIX® Sulfite 
Type Semiquantitative test strip 
Presentation Tube of 100 test strips 
Color reaction white to salmon 
Limit of sensitivity 0-10-25-50-100-250-500-1000 mg/l SO32- 
Reference 91306

Important information:
 Depending on the concentration sodium hydroxide is strongly caustic. Please pay attention on the information on the package as well as on the information in the material 
 safety data sheets.

Question 4

is this testing vitimin c

Accepted Answer

No, this product tests for sulfite in solutions. Ref 91314 Quantofix Ascorbic Acid Test Strips test for Vitamin C. Please see below:

Ref 91413
Test sticks for the semi-quantitative determination of vitamin C in solutions.
Gradation of scale: 0-50-100-200-300-500-1000-2000 mg/l vitamin C
Store test sticks for ascorbic acid in a cool and dry place, protected from sunlight and moisture

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Macherey-Nagel, 91306, Quantofix Sulfite, Box of 100 Strips

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