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.
Spatial variation of N-nitrosamines concentrations in U.S. biosolids. The entry “n” is the total number of samples analyzed in the respective region. Numbers next to the bar depict the number of detects in the respective region. Error bars represent minima and maxima.
