Abstract
A new, simple, inexpensive and fast kinetic spectrophotometric method was developed for the determination of trace amounts of resorcinol over the range of 0.02-0.80 μg/mL. The method is based on the inhibitory effect of resorcinol on the formaldehyde catalyzed oxidation reaction of of cresyl violet by bromate in acidic media is reported. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of cresyl violet at 596 nm with a fixed-time 0.5–2.5 min from initiation of the reaction.The detection limit is 0.017 μg/mL and relative standard deviation of 0.1 and 0.5 μg/mL resorcinol for six replicate measurements was 2.6 and 2.9 %, respectively. The method was applied to the determination of resorcinol in water samples.
Highlights
Resorcinol is an important industrial chemical material used widely in the fields of rubber, plastics and organic synthesis industries, wood adhesives, fire retardants and UV stabilizer, etc
We developed and validated a rapid, sensitive kinetic spectrophotometric method for the determination of resorcinol
An aliquot of the solution containing 0.20-8.0 μg/mL resorcinol was transferred into a 10 mL volumetric flask and 2 mL 6.22×10-4 M cresyl violet, 0.6 mL 5 M H2SO4 and 0.2 mL 1000 μg/mL formaldehyde were added to the flask
Summary
Resorcinol is an important industrial chemical material used widely in the fields of rubber, plastics and organic synthesis industries, wood adhesives, fire retardants and UV stabilizer, etc. The major methods for the determination of resorcinol that have already been reported are high performance liquid chromatography[2,3,4,5,6] and gas chromatography[7,8] The separations of these methods are efficient, but require expensive instrument and are expensive. Cresyl violet solution of 6.22×10-4 M was prepared by dissolving 0.020 g of the compound (MW= 321.3) in water and solution was diluted to the mark in a 100 mL volumetric flask. Bromate stock solution of 0.015 M, was prepared by dissolving 0.626 g of potassium bromate (M=167) in water and diluting to 250 mL in a 250 mL volumetric flask. Standard stock resorcinol solution (1000 μg/mL) was prepared by dissolving 0.1 g of resorcinol in water and diluted to 100 mL in a 100 mL volumetric flask.
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