Flow-injection catalytic spectrophotometic determination of molybdenum(VI) in plants using bromate oxidative coupling of p-hydrazinobensenesulfonic acid with N-(1-naphthyl)ethylenediamine

Catalytic spectrophotometric determination of trace Mo(vi) in milk-based beverages in the presence of bromophenol blue and H2O2 using SDS as a sensitizer

“…Moreover, as can be seen in Table 4, the analytical properties, such as the low detection limit, relatively wider linearity range, low temperature and short analysis time, render the present method a favorable competitor to the other surfactant-sensitized catalytic spectrophotometric methods previously published in the literature. [5][6][7][8][9][10][11][12][13][14][15][16] Therefore, this surfactant-sensitized catalytic method could also be proposed as an alternative detection tool for monitoring dissolved inorganic Mo in other sample matrices.…”

“…3 A number of kinetic spectrophotometric methods based on different indicator reactions with and without ow injection are used for the catalytic determination of Mo, including direction spectrophotometric methods. [4][5][6][7][8][9][10][11][12][13][14][15][16] In this sense, catalytic spectrophotometry, which is based on the measurement of a catalytic species in trace or ultra-trace amounts, in which an indicator substance, a chromophore absorbing in the UV-Visible region, reacts with only a reductant or oxidant, is oen the preferred kinetic method in trace analysis. Owing to the low sensitivities and selectivities of these methods, which require the use of masking agents and ion-exchange resins to suppress the matrix effect and activators and surfactants, such as sodium dodecyl sulfate (SDS), cetylpyridinium chloride (CPC), cetyltrimethylammonium bromide (CTAB) and 2-[2-[3,4-bis(2hydroxyethoxy)oxolan-2-yl]-2-(2-hydroxyethoxy)ethoxy]ethyl octadec-9-enoate (Tween 80), to improve the sensitivity of the analytical method, preconcentration and/or separation steps are usually necessary.…”