An Environmentally Friendly Flow Injection-Gas Diffusion System Using Roselle (Hibiscus sabdariffa L.) Extract as Natural Reagent for the Photometric Determination of Sulfite in Wines

Table 2

Effect of some potential interfering species.

Potential interferences	Tested concentrations	Results
Ethanol	5, 10, 15, 20, 30, 50%	Interfere at 30%
Ascorbic acid	10, 50, 100, 500, 1000 mg·L^−1	Interfere at 500 mg·L^−1
Glucose	10, 50, 100, 500, 1000 mg·L^−1	Do not interfere at 1000 mg·L^−1
Fructose	10, 50, 100, 500, 1000 mg·L^−1
Sucrose	10, 50, 100, 500, 1000 mg·L^−1
Tartaric acid	10, 50, 100, 500, 1000 mg·L^−1
Citric acid	10, 50, 100, 500, 1000 mg·L^−1
Acetic acid	10, 50, 100, 500, 1000 mg·L^−1
Lactic acid	10, 50, 100, 500, 1000 mg·L^−1
Tannin	10, 50, 100, 500, 1000 mg·L^−1