9032X
43
Waltron also offers Sodium Standard, 1 ppm, in a 1 gallon container. Part
Number N1234-541.
o
Do not use static sodium solutions of less than 50ppb because low concentration
solutions rapidly become contaminated and change in concentration.
o
Although the HIGH and LOW standard solutions are typically one decade apart in
sodium concentration, any concentration difference can be used within the
constraints of i) above and the need to have a significant change in electrode
output to achieve an accurate calibration.
Note. High purity water is water containing less than 2ppb sodium ions and a
specific conductivity of less than approximately 0.2µS/cm.
5.3
ETCHING SOLUTION
Note. Waltron offers the solution under our Part Number N1234-543,
Sodium Electrode Regeneration Solution, 2 oz size.
For use on applications where the sample sodium concentration is below 1ppb - see also
Section 5.5.2.
WARNING!
Sodium Fluoride is toxic. Avoid inhaling the dust and prevent
contact with skin and eyes. Wear a dust mask, rubber gloves and eye protection.
When prepared, the etching solution contains 0.1M Hydrofluoric acid (0.2% HF).
Take care to prevent contact with skin and eyes.
5.4
REFERENCE ELECTRODE FILL SOLUTION
(For Use with N3010-174)
Waltron offers a stock solution of 3.5 KCL Ref. Electrode Filling Solution in a 2oz.
size. Part Number N1234-548.
This solution is required for refilling the calomel reference electrode. This solution
should be stored in a tightly sealed plastic bottle. The electrode is conveniently filled
using the automatic KCl refill system.
