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建立了水中臭氧的 KI-硫酸 - 4-氨基 - N,N -二乙基苯胺 (DPD)分光光度测定法。此方法是在p H3.35条件下 ,根据臭氧与碘化钾的定量反应 :O3+2 I- +2 H+→ O2 +I2 +H2 O,生成的 I2 与 DPD反应显粉红色 ,在 5 10 nm处用分光光度计测定 ,直接测定的线型范围为 0～ 1.0 0 mg/ L ,最低检测浓度为 0 .0 1m g/ L ,相对标准偏差为 1.2 %～ 2 .7% (n=10 ) ,回收率在 98.6 %～ 10 6 .6 %之间。应用此方法对各种水样进行了测定并和碘量法做了比较 ,结果基本相符。该方法实用、可靠 ,用于实际水样中臭氧的测定 ,结果满意。
A KI-sulfuric acid-4-amino-N, N-diethylaniline (DPD) spectrophotometric method was established for the determination of ozone in water. This method is based on the quantitative reaction of ozone and potassium iodide at pH3.35, and the reaction between I2 and DPD is pink, and the reaction is at 510 nm The linear range was 0 ~ 1.0 0 mg / L and the lowest detection limit was 0. 01 m g / L by spectrophotometer. The relative standard deviations were 1.2% -2.7% (n = 10) The recoveries ranged from 98.6% to 106.6%. Using this method for a variety of water samples were measured and compared with the iodometric method, the results are basically consistent. The method is practical and reliable for the determination of ozone in the actual water samples with satisfactory results.