Study on the Interference Patterns in the 4-Amino Antipyrine Photometric Determination of Volatile Phenols in Wastewater
4-AAP光度法测定污水中挥发酚的干扰规律研究及其应用

he interference patterns with different mineral oils (crude oil,machine oil and diesel oil),aniline,some metal ions and ClO-,etc. in the 4-AAP photometric determination of volatile phenols were studied. The recovery of phenols in the presence of different amounts of interference substances was determined spearately Then,the total recovery equation Y was established. The true concentration CT of volatile phenols in wastewaterwas determined with the value CD found by 4-AAP method and the equation Y. The result from standard addition experiment with mixed interference substances shows that its relative error to the calculated value by the equation Y is below 5%. The determined result of wastewater sampleis coincident with the results determined by the derivative photometric method. This method canbe used for the determination of volatile phenols in oil field wastewater.