Red line is the diffraction profile of sodium dichloroisocyanurate taken in the region of the NaCl 220 reflection. Vertical purple lines show the position and intensity of the 220 peak in the JCPDS data (5-628) for NaCl, while green line shows measured (and scaled) data on analar NaCl. The lack of any impurity peak due to NaCl may seem obvious, but it raises the question about limits of detection in PXRD!

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