Ionode IJ pH V5.1 - Manual (Page 41)

Ionode IJ Instruction Manual 41
6. Metal
6.1. Application – IJAu
The IJAu uses a gold rod as sensor and is
designed for determining ORP measurements
in cyanide solutions, and in other applications
where Pt is easily poisoned.
See 5.3 and 5.3.1 for Cleaning/Maintenance
6.2. Application – IJAg
The IJAg uses a silver rod as sensor and can
be used for determining the activity of silver
ions by direct or indirect potentiometry, and for
determination of halides and cyanide by
argentimetric titration. The most common
application is for determination of chloride or
salt in environmental and food samples by
titration with silver nitrate.
A typical titration curve for potassium chloride
vs 0.1M silver nitrate is shown below.
Maintenance
– clean off excess silver chloride
deposits from the electrode after use. Replenish
electrolyte (with 1M KNO
3
regularly), and do not
leave the electrode immersed in silver
containing solutions when not in use.
Titration Curve of Potassium Chloride (acidified) vs 0.1M silver nitrate
using IJAg Silver Electrode with 10% KNO3 in sleeve junction
0
50
100
150
200
250
300
350
400
450
500
0.0 5.0 10.0 15.0 20.0 25.0
Volume of 0.1M silver nitrate added
Potential (mV)
Series1