Figure 7.
XPS analysis of Cr species in the soils before and after leaching by different acids. (a) Original soil, (b) soil leached by HCl, (c) soil leached by CA, (d) soil leached by OX.
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.