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.
Analysis of NIST SRM 1643e Trace Elements in Water for Mn determined via three instrumental techniques, comparing dilution with digestion, and aqueous and blood-based calibration protocols. Each data point is the mean ±U (error bars). The solid black line is the certified value for Mn and the dashed lines represent U(xNIST) limits from the NIST certificate.
