LaMotte SMART Spectro Spectrophotometer User Manual

Page 14

Below is a list of suggested wavelength ranges for the color of the reacted
samples. Use these as a starting point.

Sample

Color

Wavelength

Range

Yellow

350-450

Yellow-Orange

450-490

Orange

490-510

Pink

510-570

Red

570-600

Green and Blue

600-750

CALIBRATION CURVES

The SMART Spectro contains precalibrated tests for the LaMotte reagent
systems (see page 49). The first step in using a non-LaMotte reagent system with
your SMART Spectro is to create a calibration curve for the reagent system. To
create a calibration curve, prepare standard solutions of the test factor and use
the reagent system to test the standard solutions with the SMART Spectro.

Plot the results (in ABS or %Transmittance) versus concentration to create a
calibration curve. The calibration curve may then be used to identify the
concentration of an unknown sample by testing the unknown, reading
Absorbance or %T, and finding the corresponding concentration from the curve.
The linear range of the reagent system can be determined and this information
can be used to input a User Test into the SMART Spectro (see EDIT USER
TESTS, page 33).

PROCEDURE

1. Prepare 5 or 6 standard solutions of the factor being tested. The

concentration of these standards should be evenly distributed throughout
the range of the reagent system, and should include a 0 ppm standard
(distilled water). For instance, the solutions could measure 0, 10%, 30%,
50%, 70%, and 90% of the system’s maximum range.

2. Turn on the SMART Spectro. Select the appropriate %T/ABS wavelength

from the %T/ABS mode. Be sure to select the appropriate wavelength for
the color produced by the reagent system.

3. Use the unreacted 0 ppm standard to standardize the spectrophotometer by

using it to scan blank.

4. Following the individual reagent system instructions, react each standard

solution including 0 ppm. Record the reading and the standard solution
concentration on a chart. Readings can be recorded as percent
transmittance (%T) or absorbance (A).

SMART SPECTRO SPECTROPHOTOMETER 05.04