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Abstract
A new sensor based on oxalic acid esters (bis(2,4,6-trichlorophenyl) oxalate-TCPO and bis(2,4-dinitrophenyl) oxalate-DNPO) is presented in this work. The sensor is used for determination of hydrogen peroxide in different samples. Influence of different substances as possible interferences for the determination of new sensor was tested. Water is the biggest interfering substance but it was proved that it does not interfere with determination when it is present in traces. Different organic substances showed influence in different concentration ranges for two esters. Because of this it was possible to choose the system for different determinations depending on the sample matrix. Due to influence of water on esters, the new method was tested on the samples that contain water in traces. Since the samples were washing powders that contained sodium perborate and percarbonate, it was necessary to make calibration curves for both esters. In all cases the calibration curve was linear for concentrations of 1000 µg L−1. The detection limit for the TCPO ester and in the case of sodium perborate was 86 µg L−1 and for the DNPO ester is 48 µg L−1. The lowest concentrations that could be measured were 100 µg L−1 in both cases. Detection limits in the case of sodium percarbonate were 54 µg L−1 (for TCPO) and 48 µg L−1 (for DNPO). The lowest concentrations that could be measured in both cases was 100 µg L−1. The results obtained with the new sensor were compared with results obtained with the standard iodometric method for determination of hydrogen peroxide in per-salts. The results showed that new sensors could be applied successfully for the determination of hydrogen peroxide in the bleaching component of washing powder.