Self-filling Ampoules
for Photometric Analysis
Vacu-vials® offer the convenience
and accuracy of the self-filling ampoule in a larger diameter package
designed specifically for photometric readout. The filled ampoule
functions as a half inch (13 mm) diameter cell which may be read
in virtually any commercial spectrophotometer or colorimeter.
Vacu-vials® ampoules provide
maximum simplicity and instrumental accuracy. Use them for a wide
range of colorimetric analyses. Each ampoule is 13 mm in diameter
with a tapered, prescored tip. Reagents are vacuum sealed inside.
The Vacu-vials® Method
The ampoule is immersed in the sample and the tip snapped off.
The correct volume of sample is drawn in by vacuum, and a small
inert gas bubble remains. Sample and reagent are mixed by tilting
the ampoule so the bubble travels from end to end. In 2 minutes
or less, the developed color may be measured, using any colorimeter
or spectrophotometer which will accept a 13mm cell, to quantify
the result.
