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This paper is manufactured and tested specifically for chromatographic techniques
Rich Cook had to say:
As an acidulant it has the advantage of not upsetting tartrate stability
pH/TA reagents
Accuvin Quick Test: Free SO2 (10 tests) Anti-Oxidant Additives This paper is manufactured andSulfur dioxide (SO2) present in must and wine is not all useful as a preservative. Some is bound to other chemical components, reducing its effectiveness as a preservative by 30 70%. Also, the degree of binding can change over time, affecting the ability of an adequate dose to continue providing its preservative properties. The effectiveness of sulfur dioxide as a preservative is also pH dependent, with low pH wines requiring lower levels, and high pH