Hydrogen peroxide concentration calculation

Most factors in parameter G (Chapter 4, Equations 4.55 and 4.56) and the potential of the reference electrode are temperature-dependent this is possibly also the case for factor x. Equation 4.56 also represents the concentration of the hydroxide ion. This means that a potential sensor based on the prewave will also have to contain a pH sensor. The hydroxide ion concentration derived from the output signal of this additional sensor needs to be introduced in the algorithm for the calculation of the hydrogen peroxide concentration. As an additional sensor, a glass electrode is an obvious choice, with a temperature-dependent potential, which is the case also for the potential of the reference electrode associated with the glass electrode and for the pH of the buffers. In this research work, the influence of... 

Since the missing hydrogen peroxide concentration cannot be isolated from this in a simple way, iteration procedures are used in the sensor algorithm, in which the unknown hydrogen peroxide concentration at first is equated with the value at calibration. After calculating and comparing the left-hand and right-hand parts, it is possible to check whether the introduced concentration needs to be adapted for a subsequent calculation or sufficiently approximates the correct concentration. 

Hence another strategy was followed, where the calibration is done by means of a solution from the detection cell. With this solution, the sensor signal, as well as the concentration of hydrogen peroxide through titration, was obtained. In order to be able to calculate subsequently the original concentration in the bath where the process occurs, the dilution factor should be taken into account, and for the control of the hydrogen peroxide concentration one should bear in mind a 30-s delay. In this way, a possible difference in process-bath composition is eliminated. The equation for the calculation of the hydrogen peroxide concentration in the process bath is ... 

Equation (18.8) can be used to calculate the response for this assay. If we assume that in a buffered solution with an excess of iodide only the hydrogen peroxide concentration is significantly consumed, then we can obtain l2(t) as... 

In what way does a solution of hydrogen peroxide react with (a) chlorine water, (b) potassium permanganate solution, (c) potassium dichromate solution, (d) hydrogen sulphide 50 cm of an aqueous solution of hydrogen peroxide were treated with an excess of potassium iodide and dilute sulphuric acid the liberated iodine was titrated with 0.1 M sodium thiosulphate solution and 20.0 cm were required. Calculate the concentration of the hydrogen peroxide solution in g 1" ... 

A samphng probe is placed at any location in the stack, and a grab sample is collected in an evacuated flask. This flask contains a solution of siilfiiric acid and hydrogen peroxide, which reacts with the NO. The volume and moisture content of the exhaust-gas stream must be determined for calculation of the total mass-emission rate. The sample is sent to a laboratoiy, where the concentration of nitrogen oxides, except nitrons oxide, is determined colorimetrically. 

Kj, or the ratios of solution-phase solute concentration and adsorbed-phase concentration were calculated to estimate the relative affinity of the soils for phenolic acids. The Kj values for p-hydroxybenzoic acid, p-coumaric, vanillic, ferulic, and syringic icids were 67, 75, 69, 92 and 376, respectively for a 48-hr equilibration of 0.1 nmol mL phenolic acid solution with a sample of an alfisol preextracted in boiling water. The sorption capacity was greatly reduced by pretreatment of soil samples with sodium acetate-hydrogen peroxide to remove organic matter and metal sesquioxides. 

The numerator contains all hydroxyl radical forming reactions and all initiating reactions are summarized (Sk c(/()). The denominator contains all hydroxyl radical consuming reactions. The second term includes all reactions with intermediates (EkPi c(P,)), the third the reactions with scavengers(Lksi c(S,)). Similarly, the steady-state concentrations of ozone and hydrogen peroxide can be calculated from the liquid phase mass balances. 

In the following first example the liquid ozone concentration and the OH-radical concentration are calculated with semi-empirical formula from the mass balance for ozone (Laplanche et al., 1993). For ozonation in a bubble column, with or without hydrogen peroxide addition, they developed a computer program to predict the removal of micropollutants. The main influencing parameters, i. e. pH, TOC, U V absorbance at 254 nm (SAC254), inorganic carbon, alkalinity and concentration of the micropollutant M are taken into consideration. 

Select Analytical Method In order to calculate the mass balances necessary for data evaluation, the concentration of the incoming and outgoing ozone gas stream as well as the liquid concentration of ozone and/or hydrogen peroxide must be measured. In case of U V-radiation the amount of photons should be measured by actinometry. 

---