Method for measuring volatile phenol with low content in water body by using ionic liquid as extractant

Abstract

The invention discloses a method for measuring volatile phenol with low content in water body according to 4-amino-antipyrine of GB-7490-87. The method comprises the following steps of: taking 250 mL of sample solution to be detected (phenol with concentration of volatile phenol of 0.002-0.50 mg / L), placing the solution in a 500 mL separating funnel, respectively adding 2 mL of buffer solution and 1.5 mL of 4-amino-antipyrine solution to the separating funnel, uniformly mixing, adding 1.5 mL of potassium ferricyanide solution and uniformly mixing again, standing for 10 min for color development, adding 10 mL of 1-butyl-3-methylimidazolium hexafluorophosphate to the separating funnel, vibrating and extracting for 2 min, standing and demixing, and directly placing the lower ionic liquid layer into a 1cm cuvette, wherein the wavelength selected on a spectrophotometer is 440 nm for the measurement.

Description

Technical field The invention relates to an ionic liquid used as an extractant to measure low-content volatile phenol in water. Specifically, by selecting a suitable ionic liquid instead of chloroform as the extractant, the measurement of low-content volatile phenol in water can be achieved, and the ionic liquid can be recycled and reused. Background technique Phenol and its derivatives are toxic to humans and aquatic organisms, and are listed as one of the most common and serious environmental pollutants. Phenol naturally has a very low allowable concentration in rivers and reservoirs, but too much human discharge will cause phenol enrichment, which will seriously affect water quality and cause potential harm to public health [see: Rosana M. Alberici, Regina Sparrapan. Environ . Sci. Technol 2001, 35, 2084-2088]. Phenolic compounds are aromatic hydroxy compounds, generally divided into monohydric phenols, dihydric phenols and polyphenols. According to whether phenols can be...

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Stand for 10min to develop color

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