Figure 6.
The effect of activated carbon concentration on pigment removal. **P = 0.0011, ****P < 0.0001.
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.