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. 2019 Mar 23;411(14):3037–3046. doi: 10.1007/s00216-019-01752-y

Fig. 6.

Fig. 6

Calibration results of NIR data within the continuous production of 2-nitrodiphenylamine (NDPA). The parity plots show the predicted concentration values versus the online reference method (43-MHz proton NMR spectra). The test data set yielded RMSE values of 10, 12, 7, and 14 mmol L−1, respectively, for aniline (a), o-FNB (a), Li-aniline (c), and the product Li-NDPA (d), cf. Table 2