210 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Table I Quantitation of "Unknown" Sodium Dodecyl Sulfate (SDS) Standard vs. Working Standard Working standard: 26.68% w/w SDS Solvent subtracted Abs values: 0.3994 a.u. 0.4019 a.u.* 0.4028 a.u. "Unknown STD" Solvent Subtracted Abs % SDS Found 27.80% 0.4155 27.61 27.80% 0.4131 27.46 27.80% 0.4161 27.66 27.80% 0.4167 27.70 27.80% 0.4256 28.29 27.80% 0.4146 27.56 27.80% 0.4191 27.85 27.80% 0.4172 27.73 27.80% 0.4217 28.03 27.80% 0.4264 28.34 27.80% 0.4186 27.82 27.80% 0.4252 28.26 * The mean value, 0.4014, was used in calculations. -- N = 12 X = 27.86% SDS found (y = 0.302 RSD = 1.08%. 4000ø0 Figure 2. Water spectrum.
ANIONIC SURFACTANT QUANTITATION BY FTIR 211 460•.0 4OO•.O •400.0 •00.O •..DO. O •OO.O •:10.O •00.O •OO•.O nSO.00 *700.00 Figure 3. Sodium dodecyl sulfate standard spectrum. 4600.0 4000.0 3'I[X] oO P. eOO.D • .O lor•.o 1600.0 1300.0 1000.0 O•O. O0 71X].00 •IIWE:M. XIIIBF. Jl• (C1'1-11 Figure 4. Solvent-subtracted sodium dodecyl sulfate standard spectrum.
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