过硫酸钾氧化4-氨基安替比林分光光度法测定地表水中挥发酚

Determination of Volatile Phenol by 4-Aminoantipyrine Spectrometric Method with Potassium Persulfate as Oxidant

在pH值为10.0±0.2的缓冲溶液中,以过硫酸钾溶液作氧化剂,用经乙醇和正己烷(1+4)混合溶液提纯的4-氨基安替比林(4-AAP)作显色剂,采用三氯甲烷分光光度法测定地表水中挥发酚。结果表明,经乙醇和正己烷(1+4)混合溶液提纯的4-AAP,损失较少,且纯度较高,有利于准确配制4-AAP溶液。此外,稳定、无色的过硫酸钾溶液代替稳定性差、有毒的铁氰化钾溶液作氧化剂,有利于降低空白值,且显色稳定,方法检出限为0.3μg/L,用于测定地表水中的挥发酚,平均加标回收率为96.0%。满足标准方法的要求。

In the buffer solution with pH 10.0±0.2,potassium persulfate solution was used as oxidant,volatile phenol in surface water was determined by spectrophotometric method with 4-AAP purified by the mixed solution of ethanol and hexane(1+4).The results showed that 4-AAP purified by the mixed solution of ethanol and hexane(1+4)had less loss and higher purity,which was beneficial to the accurate preparation of 4-AAP solution.In addition,the stable and colourless potassium persulfate solution was used as oxidant instead of potassium ferricyanide solution,which is favorable to reduce the blank value,and the color is stable.The detection limit was 0.3μg/L,which met the requirements of the national standard method.Volatile phenol in surface water was determined by this method with 96.0%of average standard addition recovery.