Maintenance
43
Waltron User Manual 101-045-E.1
9031CX Sodium Analyzer
4.3
ETCHING SOLUTION
4.3.1
PREPARING ETCHING SOLUTIONS
ATTENTION
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.
Dissolve 5.0 (
0.2)g analytical grade sodium fluoride, NaF, in approximately 400ml high purity water.
Add to this solution 20 (
0.2)ml 5M acetic acid*, CH3COOH, and dilute to 1 liter.
ATTENTION
5M acetic acid can be prepared from concentrated acid by adding 144 ( 1)ml
analytical reagent grade glacial acetic acid (1.05 s.g.) to 500ml of high purity
water.
WARNING
Prepare the acetic acid solution under a fume hood and take the appropriate
precautions when handling concentrated acids.
4.4
REFERENCE ELECTRODE FILL SOLUTION (FOR USE WITH N3010-174)
ATTENTION
Waltron offers a stock solution of 3.0 M Potassium Chloride in a 2oz. size. Part Number
N1234-547.
This solution is required for refilling the reference electrode at extended intervals. This solution should
be stored in a tightly sealed plastic bottle. The electrode is most conveniently filled using the supplied
eyedropper or a syringe.
