Analysis Of Lactic Acid And Peroxomonosulphate

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The kinetics of the reaction between peroxomonosulphate with Lactic acid was studied in the presence of Mn(II) at alkaline pH. The reaction followed first order with respect to peroxomonosulphate. The rate of the reaction was studied under pseudo first order condition and found to increases with the [Mn(II)] and lactic acid. Thermodynamic parameters were calculated and reported. Based on the results a rate equation, kinetic scheme and a most probable mechanism has been predicted.
Keywords: Alpha hydroxy acid, Lactic acid, Peroxomonosulphate, Manganese (II).

I.INTRODUCTION
Peroxomonosulphate (PMS) is a versatile oxidant (Lavanya et.al,2015) and is widely used in environmental applications (Edwards et.al., 1989) such as the decontamination (Johnson
…show more content…
So it is necessary to study the effect of sulphate ion during the course of the reaction. The kobs values are calculated at a different sulphate ion concentration by maintaining the concentration of all other constituents of the reaction mixture a constant. The rate of the reaction was found to be independent of the sulphate ion concentration.

102 × [SO42-]
105 ×kobs (s-1)

0.00
5.7248

2.50
5.6745

3.70
5.9126

5.00
5.7383
TABLE - 2
Effect of [SO42-] on kobs
[LA] = 0.05M ; [Mn(II)] = 5 × 10-4 M ; Temp = 305K ;
C. EFFECT OF Mn(II) ON kobs The effect of the metal ion in all the three temperature are determined by varying the metal ion concentration and keeping the concentration of lactic acid and oxidant constant. The concentration of Mn(II) used in this study is in the range 5x10-5M to 3x10-4 M. It is observed that the kobs values increased with the metal ion concentrations and the results are given in Fig 2. The plot of kobs versus Mn(II) are straight lines passing through origin.

10-3 [Mn(II)] M

10-5 kobs(s-1)

5.0000

5.7248

1.0000

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