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Figure 5
(a) Raman calibration standards for KNO3 aqueous solutions highlighting the concentration dependence of the 1047.46 cm−1 peak in the spectra. (b) Magnification of the dotted box in (a) showing the LOD for KNO3 solutions of ∼0.625 g L−1. (c) Linear calibration of the peak height and area versus solution concentration of the 1047.46 cm−1 peak. (d) Interval plots of the peak heights for the 0.625, 1.25 and 2.5 g L−1 KNO3 solutions, showing the spread of data for five replicate measurements used to calculate the standard deviation and RSD. |