Using DTPA to Decrease Manganese-Induced Peroxide Decomposition

Abstract

The catalytic activity of Mn(+II) and Mn(+III) in decomposing hydrogen peroxide was studied by using DTPA as the only stabilizer. It was found that the addition of DTPA to a Mn(+II) containing system is more effective than if it is added to a Mn(+III) containing system. To decrease the catalytic effect of Mn(+III), sodium borohydride and DTPA under an acidic condition were considered to reduce Mn(+III) to Mn(+II). The effect of pH on using DTPA to decrease Mn-induced peroxide decomposition is discussed.

Keywords:

• Hydrogen peroxide
• Decomposition
• Bleaching
• Transition metal ions
• Manganese
• DTPA
• pH

Acknowledgments

The authors wish to thank Dr. J. Lidén of AssiDomän, Sweden, for his valuable suggestions to improve the manuscript. Financial support of the project was from NCE Wood Pulps Network.