A kinetic method for the determination of thiourea by its catalytic effect in micellar media

A new and sensitive reaction rate method for spectrophotometric determination of trace amounts of thiourea in different water samples based on an induction period

“…The analytical parameters of reported methods for determination of TU are summarized in Table 2. It was clear that the detection limit of the proposed method is better than or comparable with othe reported methods (Toyoda et al 1979, Abbasi et al 2009). Some of these methods have better detection limit than the proposed method (Abbasi et al 2010, Raffaelli et al 1997, but suffer from the expensive equipments (Raffaelli et al 1997)or time consuming (Abbasi et al 2010).…”

“…Based on the literature survey only a few numbers of indicator reactions for the kinetic determination of TU by spectrophotometric method have been published (Abbasi et al 2009;Abbasi et al 2010). All of these methods are based on the catalytic effect of the TU on the certain indicators reactions.…”

Determination of thiourea in fruit juice by a kinetic spectrophotometric method

“…The possible mechanisms of the JG oxidation by thiourea given by Abbasi et al [41]. According to these authors, this mechanism seems to contribute to the following reactions in its simplest form:…”

“…These are based on direct reflectance spectrometric measurements [23][24][25], Raman spectroscopy [26], mass spectrometry [27], FTIR [28,29], voltammetry [16], potentiometry [30], amperometry [31], titrimetry with iodine [32], potassium dichromate [33] and Masson and Race reagent [34], gas chromatography after benzoylation [35], highperformance liquid chromatography [36], flow injections methods [37][38][39] and kinetic methods [40,41]. Catalytic kinetic spectrophotometric method is a suitable technique for determination of trace levels of thiourea because of its high sensitivity and selectivity and ease of instrumentation.…”

“…Based on our knowledge, there is a kinetic catalytic spectrophotometric method for the determination of thiourea [41]. This method is based on oxidation of Janus green (JG) in acid phosphoric media and presence of Triton X-100 surfactant.…”