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.
(A) Schematic of a µPAD, consisting of a PDMS lid for applying equal pressure across the paper surface, a 10 mm filter punch containing PM from baghouse dust, and a patterned filter paper treated with reagents for colorimetric analysis of total Cr. (B) The combined device. (C) Analytical devices can be mass-produced on a single sheet of filter paper (the figure shows 63 individual devices).
