10
7. Appendices
Electrolyte specification
H
2
SO
4
dilute sulfuric acid, specific gravity = 1.280
Specific gravity at 20°C 1.280 +/-0.005
Visual aspect Clear
Freezing point -66°C
Maximum impurities (mg/l)
Antimony Sb 0.4
Arsenic As 0.1
Copper Cu 6.2
Sulphur S 0
Selenium Se 0.4
Iron Fe 10.6
Zinc Zn 2.8
Nickel Ni 0.4
Cobalt Co 0.4
Manganese Mn 0.4
Platinum Pt 0
Chloride Cl
-
6.2
Nitrate NO
3
4.5
Ammonia NH
3
2.8
Anhydride sulphur SO
2
4.5
Materials oxydisable to KMnO
4
- 25.4
Visual Aspect Clear
Resistivity >60 000 Ω
Maximum Impurities (ppm)
Iron Fe 5
Copper Cu 5
Arsenic As 1
Antimony Sb 1
Manganese Mn 0.1
Nickel Ni 0.1
Chloride Cl
-
5
Nitrate NO
3
-
5
Lead Pb 0
Zinc Zn 0
Platinum Pt 0
Potassium K 0
Iodine I 0
Bromide Br 0
Phosphate PO
4
2-
0
Sulphate SO
4
2-
0
Ammonia NH
4
8
pH - 4 to 7
Dry residue at 110°C (a) 350ppm
Dry residue at 500°C (b) 250ppm
Organic matter (a) – (b) 100ppm
Total hardness: total hardness expressed
as calcium carbonate (calcium + magnesium) 1°F = 10ppm
Distilled or de-ionised water specification