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The emission produced by sulfite in its oxidation by periodate in acidic solution in the presence of Ru(phen)3 2+ is used to determine 1.0x10−7 to 1.5x10−4 mol/L sulfite. The limit of detection is 7x10−10 mol/L and the relative standard deviation is 2.3% for a 4x10−5 mol/L sulfite solution (n=9). The method was applied satisfactorily to the determination of sulfur dioxide in air by using triethanolamine (TEA) as absorbent material.
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He et al. (1999) studied this question.
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