聚合物-盐-水析相体系的液-固萃取光度法测定痕量酚

Spectrophotometric Determination of Trace Phenol by Liquid-Solid Extraction Based on Polymer-Salt-Water Phase Separation System

关键词:  苯酚  痕量分析  液-固体系析相萃取法  光度法

Key words:  phenol  trace analysis  liquid-solid extraction  spectrophotometry

摘要:

在pH值9.5的NH₃-NH₄Cl缓冲溶液中,在高碘酸钾作用下,苯酚与4-安替比林反应生成红色的吲哚安替比林染料,以聚乙二醇-1000作为析相剂,加入电解质硫酸铵后,溶液分为两相,红色染料被萃入有机相,最大吸收波长为495nm,吸光度与苯酚浓度在0~1.25μg/ml范围内呈线性天系(r=0.9998)。检出限为0.002μg/ml。方法已用于水样、煤油中苯酚的测定,结果满意。对煤油样品的分析结果表明,聚合物-盐-水体系析相萃取法能应用于水溶液中物质和有机溶剂中物质的分离和测定。

Abstract:

A novel method for the spectrophotometric determination of trace phenol is developed. Phenol is reacted with 4-antipyrine in the presence of potassium periodate in pH value 9.5 NH₃-NH₄C1 buffer solution, and produced indoxyl antipyrine, an orange dyestuff. Polyethlene glycol-1000 is used as an extractant. The organic polymer phase containing indoxyl antipyrine exhibits a maximum wavelength at 495 nm. There is a linear relationship between absorbance and concentration of phenol in the concentration ranging from 0 to 1.25 μg/ml. The correlation coefficient is 0.9998. The detect limit is 0.002 μug/ml. The method is applied to determine trace phenol in the water and kerosene and has satisfying results. It is suggested that the polymer-saltwater phase separation system could be used in the separation and determination of both organic pollutants in oil such as kerosene and pollutants in the water.