Instrumental Colorimetric Analysis
The Vacu-vials
®
Method
The sampling method is the same as the CHEMets method (Steps 1 &
2), but rather than comparing results visually, the user places the filled
ampoule in the cell holder of an instrument set to a wavelength for
optimal absorbance (Step 3). If you use an instru-
ment that reads absorbance, the
absorbance value can be converted to
concentration units with the supplied
calibration chart. Direct-reading instru-
ments are available (pages 12-13, 15).
Vacu-vials
®
Kits include 30 ampoules,
a calibration chart, a zero standard,
accessory solution(s) (when necessary), a sample cup, and instructions.
Material Safety Data Sheets are provided in test kits.
Designed with the same technology as the CHEMets ampoules, the Vacu-
vials ampoules are 13 mm in diameter with a tapered, pre-scored tip;
color forming reagents are vacuum-sealed inside.
The Vacu-vials Test Procedure
STEP STEP STEP
1 2 3
7
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