4 CALIBRATION
29
4.5
Calibrating Color
There are three calibration patterns for color, not including automatic zero calibration.
See "4.1 Calibration Patterns and Cycles" (page 17) and select one of the patterns.
See "5.3 Automatic Zero Calibration" (page 78) for automatic zero calibration settings.
Note
Span calibration solution for color affects the residual-chlorine sensor. When performing span
calibration for color, remove the residual-chlorine sensor and attach the provided rubber plug.
Tip
Turbidity may cause variation in the measured value of color. Correct turbidity as required.
See "5.9.3 Correcting color using turbidity" (page 95).
<Reference> Making color span calibration solution
Color standard solution (1000 CU)
Referring to JIS-K101
Take 2.49 g kalium hexachloro-platinate (IV) (potassium chloroplatinate)
*
stipulated in JIS-
K8163
(Note)
and 2.00 g of cobalt (II) chloride hexahydrate stipulated in JIS-K8129, add them
to 200 mL of hydrochloric acid stipulated in JIS-K8180. Dissolve it with purified water, pour it
into a 1000 mL flask, and then fill it with purified water up to the gauge line. Store the liquid in
a colored bottle.
Note
*:
If using platinum instead of kalium hexachloro-platinate (IV) stipulated in JIS-K8163, dissolve 1.00 g of
platinum in an appropriate amount of aqua regalis (hydrochloric acid 3 + nitric acid 1), add an excess
amount of hydrochloric acid, and then evaporate off the liquid by boiling. After removing the nitric
acid by repeating this procedure two to three times, dissolve with 2.00 g of cobalt (II) chloride
hexahydrate stipulated in JIS-K8129 and 200 mL of hydrochloric acid stipulated in JIS-K8180, pour the
liquid into a 1000 mL flask, and then fill it with water up to the gauge line.
Color standard solution (20 CU)
Put 20 mL of commercial color standard solution (1000 CU) or solution prepared using the
above procedure into a 1000 mL flask and fill it with purified water up to the gauge line.
CAUTION
CHEMICAL CAUTION
Be careful not to drop color span calibration solution on your skin or drink it.
If color span calibration solution comes into contact with your skin or eyes, immediately wash away
with running water. If you swallow the solution, contact your doctor immediately.
JIS
Reagent
Amount
JIS-K8163
Kalium hexachloro-platinate (IV)
2.49 g
JIS-K8129
Cobalt (II) chloride hexahydrate
2.00 g
JIS-K8180
Hydrochloric acid
200 mL
Summary of Contents for TW-100
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