Method for determining volatile phenol in water

Abstract

The invention provides a method for determining volatile phenol in water. In color reaction using 4-amino-antipyrine direct spectrophotometry to determine volatile phenol in water, the method uses Tween-80 as nonionic surfactant to play a role in stability augmentation and sensitivity enhancement, reduce system blank value and improve determination sensitivity. The method comprises the following steps: accurately shifting 1.00 mu g / mL of freshly prepared phenol-standard solution or a certain amount of to-be-determined water sample subjected to predistillation into a 50mL colorimetric tube; adding water to a scale; adding 0.50 mL of ammoniacal buffer solution and fully mixing the materials; adding 0.40 mL of 1 percent Tween-80 solution and mixing the materials well; adding 1.50 mL of 2 percent 4-amino-antipyrine solution and fully mixing the materials for 2 minutes; adding 1.00 mL of 8 percent potassium ferricyanide solution, fully mixing the materials for 1 minute and keeping the mixture stand for 10 minutes; and then determining the absorbance value of the mixture. A colored compound solution prepared in the invention is stable for at least 2 hours, thus the stability of the colored compound solution is greatly enhanced than that in the prior method before improvement, and the colored compound solution is obviously lower in blank absorbance value and higher in sensitivity, and has detection limit lower than that of the national standard method. The method has the advantage of determining the volatile phenol in tap water samples, along with high recovery rate and accurate results.

Description

technical field [0001] The invention relates to a method for measuring volatile phenol content in water. Background technique [0002] Wastewater from oil refining, coking, gas washing, papermaking, synthetic ammonia, wood preservation, and chemical industry are the main sources of phenolic compounds in water, especially for drinking water, which seriously affects its water quality. According to different boiling points, phenol can be divided into volatile phenol and non-volatile phenol, and volatile phenol is the most harmful. Therefore, volatile phenols in water are one of the important indicators for water quality monitoring. [0003] The 4-aminoantipyrine photometric method for volatile phenols in water is a standard method in GB2001 "Hygienic Standards for Drinking Water", which has become a classic method and has been widely used. There are chloroform extraction method and direct photometric method in the photometric method of 4-aminoantipyrine. However, in use, the...

AI Technical Summary

Problems solved by technology

However, in these methods, most of the reagents need to be processed, the process is cumbersome, the operation is relatively complicated, and it takes a long time.

Rare reports of method improvement using surfactants

Images