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Ion-chromatography chromatogram of organic acids of Shanxi aged vinegar. Peaks: 1, Lactic acid; 2, Acetic acid; 3, Propanoic acid; 4, Butanoic acid; 5, 3-Methylbutanoic acid; 6, Pentanoic acid; 7, Hexanoic acid; 8, Succinic acid; 9, Tartaric acid; 10, Citric acid
