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

<div>Influence of pH on ΔAbs. of roselle extract. Inset: spectra of roselle extract in various pH.</div>

Journal of Analytical Methods in Chemistry

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Figure 2: An Environmentally Friendly Flow Injection-Gas Diffusion System Using Roselle (<i>Hibiscus sabdariffa</i> L.) Extract as Natural Reagent for the Photometric Determination of Sulfite in Wines 

Figure 2 | 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 