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Table 3 DS calibration curves obtained by applying polynomial (2nd degree) and linear regressions

From: A diagnostic tool for assessing the conservation condition of cellulose nitrate and acetate in heritage collections: quantifying the degree of substitution by infrared spectroscopy

Analytical methodPolynomial fittingLinear fitting
EquationR2EquationR2
μFTIR r = \(\text{A}_{3350\,\text{cm}^{-1}}\)/\(\text{A}_{1050\,\text{cm}^{-1}}\)r = 0.088DS2 − 0.600DS + 1.0040.998r = − 0.341DS + 0.8960.948
ATR-FTIR r = \(\text{A}_{3330\,\text{cm}^{-1}}\)/\(\text{A}_{1030\,\text{cm}^{-1}}\)r = 0.039DS2 − 0.262DS + 0.4270.993r = − 0.146DS + 0.3790.940