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

Analytical method | Polynomial fitting | Linear fitting | ||
---|---|---|---|---|

Equation | R^{2} | Equation | R^{2} | |

μFTIR r = \(\text{A}_{3350\,\text{cm}^{-1}}\)/\(\text{A}_{1050\,\text{cm}^{-1}}\) | r = 0.088DS^{2} − 0.600DS + 1.004 | 0.998 | r = − 0.341DS + 0.896 | 0.948 |

ATR-FTIR r = \(\text{A}_{3330\,\text{cm}^{-1}}\)/\(\text{A}_{1030\,\text{cm}^{-1}}\) | r = 0.039DS^{2} − 0.262DS + 0.427 | 0.993 | r = − 0.146DS + 0.379 | 0.940 |