I am working on the photocatalytic generation of Fe(IV)=O species using molecular oxygen. During the course of the reaction, the formation of singlet oxygen is also taking place as a side product. My concern is that "can singlet oxygen form H2O2 during the reaction?". If it is possible then the reaction pathway will be entirely different from the expected one. I can not neglect the possibility of the formation of H2O2 using MnO2 as there are a lot of O2 radical intermediates are involved in the formation of Fe(IV)=O species. I have tried adding MnO2 to the reaction mixture but the reaction did not proceed at all. I want a way to check the involvement or presence of H2O2 in my reaction. The method should not interfere with the superoxo or peroxo radical intermediates forming on Fe centre in the process of formation of Fe(IV)=O species.