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采用紫外分光光度法，于二氧化氯有特征吸收峰的 ２６０ｎｍ波长下测定溶液中二氧化氯含量。对二氧化氯含量＜３００ ｍｇ／Ｌ的溶液，测定结果的相对标准偏差≤５．０９％。样品溶液ｐＨ值在５～１０与放置时间≤５０ ｍｉｎ时，对测定结果影响不大。
UV spectrophotometry was used to measure the content of chlorine dioxide in the solution under the wavelength of 260nm with the characteristic absorption peak of chlorine dioxide. For chlorine dioxide content <300 mg / L solution, the relative standard deviation of the determination result is ≤5.09%. When the pH value of the sample solution is between 5 and 10 and the setting time is less than or equal to 50 min, the sample solution has little effect on the determination result.