8
OPERATIONAL PROCEDURES
A. Preparing Standard Solutions
Suitable conductivity standards are available commercially, the user
can prepare them using research grade reagents.
Here are some standard solutions the user can prepare to calibrate
the probe of the model 6360.
1.
Standard solution of 14.94uS at 25
℃
: Accurately measure out
100ml of the 147uS standard solution as in point 4. Dilute it
with 900ml of distilled water.
2.
Standard solution of 147uS at 25
℃
: Accurately measure out
100ml of the 1413uS standard solution as in point 1. Dilute it
with 900ml of distilled water.
3.
Standard solution of 1413uS at 25
℃
: Accurately weight out
0.746 g of research grade dried Potassium Chloride (KCL).
Dissolve in 1000ml of distilled water.
4.
Standard solution of 12.90mS at 25
℃
: Accurately weight out
7.4365 grams of research grade dried Potassium Chloride
(KCL). Dissolve in 1000ml of distilled water.
5.
Standard solution of 111.9mS at 25
℃
: Accurately weight out
74.264 grams of research grade dried Potassium Chloride
(KCL). Dissolve in 1000ml of distilled water.
[Note:
The user can store the remaining solution in a plastic
container for one week but the air space between the cap and the
solution must be kept to an absolute minimum. Storing the excess
solution below 4
℃
can increase the storage life. If you have any
doubt of the accuracy of the stored solution, a fresh batch should be
prepar ed.
]