Fig. 4From: Quantitative Analysis of Single and Mix Food Antiseptics Basing on SERS Spectra with PLSR Method a average Raman spectra of 0.3~10 mg/L PS adsorbed on the SERS substrates; b PS concentration predicted by the PLSR model established with Raman spectra of 0.3~10 mg/L PS. Five spectra of each sample were measured on positions selected randomly, and the integration time was 20 sBack to article page