title: Rapid and simple spectrophotometric determination of persulfate in water by microwave assisted decolorization of Methylene Blue.
abstract: A rapid and simple method for determination of persulfate in aqueous solution was developed. The method is based on the rapid reaction of persulfate with Methylene Blue (MB) via domestic microwave activation, which can promote the activation of persulfate and decolorize MB quickly. The depletion of MB at 644 nm (the maximum absorption wavelength of MB) is in proportion to the increasing concentration of persulfate in aqueous solution. Linear calibration curve was obtained in the range 0-1.5 mmol/L, with a limit of detection of 0.0028 mmol/L. The reaction time is rapid (within 60 sec), which is much shorter than that used for conventional methods. Compared with existing analytical methods, it need not any additives, especially colorful Fe2+, and need not any pretreatment for samples, such as pH adjustment.
authors.affiliation: Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China. Electronic address: movinglj@sina.com.
authors.forename: Lajuan
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China. Electronic address: shiningpup@hotmail.com.
authors.forename: Shiying
authors.initials: S
authors.lastname: Yang
authors.affiliation: Qingdao Shuiqingmuhua Environmental Engineering Co., Ltd., Qingdao 266100, China.
authors.forename: Leilei
authors.initials: L
authors.lastname: Wang
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Shi
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
authors.forename: Meiqing
authors.initials: M
authors.lastname: Huo
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
mesh_terms: D004791:Enzyme Inhibitors / Q000737:chemistry; D008751:Methylene Blue / Q000737:chemistry*; D015203:Reproducibility of Results; D013053:Spectrophotometry / Q000379:methods*; D013440:Sulfides / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D004791:Enzyme Inhibitors; D013440:Sulfides; D014874:Water Pollutants, Chemical; C051552:persulfides; D014867:Water; D008751:Methylene Blue
keywords: Decolorization; Methylene Blue; Microwave activation; Persulfate; Spectrophotometric determination