title: Determination of trace amount of formaldehyde base on a bromate-Malachite Green system.
abstract: A novel catalytic kinetic spectrophotometric method for determination of trace amount of formaldehyde (FA) has been established, based on catalytic effect of trace amount of FA on the oxidation of Malachite Green (MG) by potassium bromate in presence of sulfuric acid medium, and was reported for the first time. The method was monitored by measuring the decrease in absorbance of MG at 617 nm and allowed a precise determination of FA in the range of 0.003-0.08 μg mL(-1), with a limit of detection down to 1 ng mL(-1). The relative standard deviation of 10 replicate measurements was 1.63%. The method developed was approved to be sensitive, selective and accurate, and adopted to determinate free FA in samples directly with good accuracy and reproducibility.
authors.affiliation: College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China. Electronic address: tyfchky@126.com.
authors.forename: Yufang
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Yueyang Vocational & Technical College, Yueyang 414000, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.affiliation: College of Chemistry, Xiangtan University, Xiangtan 411105, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Weng
authors.affiliation: College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Tang
authors.affiliation: College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
authors.forename: Miaoling
authors.initials: M
authors.lastname: Zhang
authors.affiliation: College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Hu
mesh_terms: D065966:Absorption, Physicochemical; D001959:Bromates / Q000737:chemistry*; D002138:Calibration; D005504:Food Analysis; D005557:Formaldehyde / Q000032:analysis*; D010084:Oxidation-Reduction; D012015:Reference Standards; D012394:Rosaniline Dyes / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature
chemical_list: D001959:Bromates; D012394:Rosaniline Dyes; D013464:Sulfuric Acids; C019536:potassium bromate; C005095:malachite green; D005557:Formaldehyde; C033158:sulfuric acid
keywords: Catalytic kinetic; Formaldehyde (FA); Malachite Green (MG); Spectrophotometric method