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6 SPARES & ACCESSORIES
Item
Combination electrode
assembly
Flow-through cap
Internal filling solution
(50ml bottle)
End cap
Spares kit
comprising:
10 membranes
1
silicone washer
1
pH electrode O-ring
2
O-rings (end cap & top cap)
1
O-ring (for use in flowcell)
Part No.
8002 650
8002 830
8002 240
8002 820
8002 260
APPENDIX
A.1 Procedure for Chloridising the
Reference Element
A.1.1 Requirements
1)
Chemicals:
a) Plating solution Hydrochloric acid 0.1M
(500ml)
Note. Do not use acid preserved with
mercuric ions.
b) Plating solution
c) Cleaning solutions:
Ammonia solution 50% vol./vol. (200ml)
To prepare, dilute 100ml A.R. concentrated
ammonia solution, s.g. 0.88, with100ml distilled
water and stir.
Nitric acid, 25% vol./vol. (200ml)
To
prepare,
cautiously
concentrated nitric acid, s.g. 1.42, into 150ml
distilled water, stirring continuously. Allow to
cool before use.
Caution. Strong
solutions and strong nitric acid are both very
poisonous and corrosive. Care should be
taken not to inhale the fumes of either or to
get any on skin or clothing. Any slight
spillage on skin, clothing or working surface
should be washed away with plenty of
water.
2)
Hardware:
Constant current supply, 2mA d.c. output
Silver wire (counter electrode)
1 beaker
pour
50ml
A.R.
ammonia
15
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