[The study on linear relationship between concentration and surface-enhanced Raman spectroscopy (SERS) signal of...

The authors used polymer as a stable medium to protect Ag sol to get a stable signal for the unstable Ag sol. Poly-acrylic acid sodium was selected as the stable medium, which had a little effect on the SERS of thymine and made the SERS signal stable for thirty days. After aborative consideration and some trials, pyridine was picked as an internal standard for the quantitative detection of thymine. A linear correlation between the concentration of thymine and the ratio of thymine signal to pyridine signal intensity was obtained over a range of 2 x 10(-4)1 x 10(-3) mol x L(-1) with a correlation coefficient R2 of 0.975 4. The regression equation is: y = 3.143x + 0.348 7. The proposed method has the potential for quantitative analysis of the trace compounds having SERS effects.