Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) SERS spectra of melamine solution in milk with a concentration of 10−6 to 10−3 M. (b) SERS spectra of Sudan red I (10−6 M, black line), malachite green (MG, 10−9 M, red line), Congo red (10−6 M, blue line), R6G (10−10 M, pink line), and their mixtures.
