Figure 4.
Changes in Cr and Mn oxidation state as a function of time showing initial reduction followed by oxidation. Milligrams of particles per filter are shown along with Cr and Mn mole percentages.
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.