n
REAGENT BLANK
Some tests will provide greater accuracy if a reagent blank is determined to
compensate for any color or turbidity resulting from the reagents
themselves. A reagent blank is performed by running the test procedure on
10 mL of demineralized water. Use sample water to
SCAN BLANK
. Insert
the reagent blank in the colorimeter chamber and select
SCAN SAMPLE
.
Note result of reagent blank. Perform the tests on the sample water as
described. Subtract results of reagent blank from all subsequent test results.
NOTE: Some tests require a reagent blank to be used to
SCAN BLANK
.
n
COLORIMETER TUBES
Colorimeter tubes which have been scratched through excessive use should
be discarded and replaced with new ones. Dirty tubes should be cleaned on
both the inside and outside. Fingerprints on the exterior of the tubes can
cause excessive light scattering and result in errors. Handle the tubes
carefully, making sure the bottom half of the tube is not handled.
LaMotte Company makes every effort to provide high quality colorimeter
tubes. However, wall thicknesses and diameter of tubes may still vary
slightly. This may lead to slight variations in results (e.g. if a tube is turned
while in the sample chamber, the reading will likely change slightly). To
eliminate this error put the tubes into the sample chamber with the same
orientation every time.
The tubes that are included with the colorimeter have an index mark to
facilitate this. If possible, use the same tube to
SCAN BLANK
and
SCAN
SAMPLE
.
n
METER CARE
The optical system of the SMART2 must be kept clean and dry for optimal
performance. Dry the colorimeter tubes before placing them in the
chamber to avoid introducing moisture. For best results store the
instrument in a area that is dry and free from aggressive chemical vapors.
n
SELECTING AN APPROPRIATE WAVELENGTH
The most appropriate wavelength to use when creating a calibration curve
is usually the one which gives the greatest change from the lowest reacted
standard concentration to the highest reacted standard concentration.
However, the absorbance of the highest reacted standard concentration
should never be greater than 2.0 absorbance units. Scan the lowest and
highest reacted standards at different wavelengths using the absorbance
mode to find the wavelength which gives the greatest change in
absorbance without exceeding 2.0 absorbance units. Use this wavelength to
create a calibration curve.
SMART2 COLORIMETER 1.07
13
Summary of Contents for Smart 2
Page 1: ...SMART2 Colorimeter OPERATOR S MANUAL V 2 3 1 07 1919 MN...
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