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Chromotropic acid : ウィキペディア英語版 | Chromotropic acid
| Section2 = }} Chromotropic acid has the formula is (HO)2C10H4(SO3H)2. It can be used for as a reagent in the quantitative determination of the systemic herbicide, 2,4-Dichlorophenoxyacetic acid.〔(Plant Physiology ''Letourneau and Krog'' 27 (4): 822. (1952) )〕 The usefulness of this reagent in quantitative determination is the formation of a red colouration (peaking at 580 nm wavelength) when chromotropic acid in 75% sulfuric acid reacts with formaldehyde. The colouration is specific to this aldehyde and is not produced from other organic species such as ketones and carboxylic acids. ==References== 〔
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