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水中臭氧浓度的测定已有许多报道,如碘量法,直接紫外吸收法,丁香醛连氮法,电化学分析法等.这些方法在应用中都存在一定的局限性,尤其在浓度较低时,或受灵敏度限制或因干扰物质的影响,结果误差较大.本文研究了以二磺酸靛蓝为显色剂,利用褪色光度法测定水样的吸光度,从而确定水样中的臭氧浓度.结果表明,本法检出限为5μg·L~(-1),RSD为0.5%～1.2%,回收率为98%～102%.1 基本原理二磺酸靛蓝分子结构中存在着由苯环、羰基、碳碳双键组成的共轭体系,这个共轭体系构成分子的发色体,使其呈现蓝色.当共轭体系与臭氧分子相遇时,臭氧进攻(?)使其断裂,原来的发色体遭到破坏,颜色消褪.臭氧对二磺酸靛蓝分子中的(?)有高度的反应活性,反应时物质的量比为1:1.在臭氧水溶液中加入二磺酸靛蓝,其颜色将会变浅直至消褪,基(?)建立了光度法
There are many reports on the determination of ozone concentration in water, such as iodometry, direct UV absorption, syringaldazin, electrochemical analysis, etc. These methods have some limitations in application, especially when the concentration is low , Or by the sensitivity limit or due to interfering substances, the results of a larger error.In this paper, the indigo dye as a reagent, the use of fading spectrophotometric determination of water absorbance to determine the ozone concentration in water samples Results The results showed that the detection limit of this method was 5μg · L -1, the RSD was 0.5% -1.2% and the recoveries were 98% -102% .1 The basic principle The indigo molecular structure of disulfonic acid exists in the form of benzene ring, Carbonyl, carbon-carbon double bond conjugate system, the conjugate system constitutes the molecular color of the body, making it blue .When the conjugate system and the ozone molecules meet, the ozone attack (?) To fracture, the original Chromosomes were destroyed, the color faded ozone on the indigo molecule disulfonate (?) High reactivity, reaction mass ratio of 1: 1 in the ozone solution was added indigo dye disulfonic acid, Its color will be shallow until faded, the base (?) Established a photometric method