Figure 1.
Pictures of the calcium phosphate before (a) and after soaking in a humic acid solution at 0.1 g mL−1 (b).
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.