Test device and method for the semi-quantitative determination of chlorine dioxide in a liquid sample containing free chlorine

摘要

The invention relates to a test device (1) for the semi-quantitative determination of chlorine dioxide in a liquid sample, the test device having at least two carrier matrices (2, 3), the first carrier matrix (2) at least one amino acid, sodium thiosulfate, at least one redox indicator, Contains buffer substances and at least one surfactant, the second carrier matrix (3) containing at least one inorganic iodide salt, starch, sodium thiosulfate, buffer substances and at least one surfactant, and the compositions of the carrier matrices (2, 3) being selected such that the measuring range 10-2000 mg / L chlorine dioxide is covered by the first carrier matrix (2) and the measuring range 2000-3500 mg / L chlorine dioxide is covered by the second carrier matrix (3). The invention further relates to a method for the semi-quantitative determination of chlorine dioxide in a liquid sample containing free chlorine, comprising: bringing the liquid sample into contact with both carrier matrices (2, 3) of a test device (1) according to one of the preceding claims; Comparison of the color of both carrier matrices (2, 3) with a color scale to read off the chlorine dioxide concentration.