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.
UV-visible spectra of reaction mixtures; CK2Cr2O7 = const = 6.05 mmol·L−1; CAl2(SO4)3 = const = 0.27 mmol·L−1. Initial concentration of betulin corresponds to N curves (mmol·L−1) 1–0; 2–0.40; 3–0.80; 4–1.21; 5–1.61; 6–2.01; 7–2.82; 8–4.03. The inset figure is magnification for the absorbance A: A = f (cbetulin).
