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BKI 11 ATEX 0012 X
2. Non-organic deposits
Rinse the electrode with warm water then dry up gently using a soft rag!
Soak the electrode for 15 mins in 0.1 mol/l EDTA (ethylenediaminetetraacetic acid) solution!
Rinse the electrode again with warm water then dry up gently using a soft rag!
Soak the electrode for 1 hour in 3mol/l KCl solution then perform the calibration procedure!
3. Protein deposits
Rinse the electrode with warm water then dry up gently using a soft rag!
Soak the electrode for 15 mins in 0.5 mol/l hydrochloric acid (HCl) or in 0.1 mol/l HCl and 0.1% pepsin mixture!
Rinse the electrode again with warm water then dry up gently using a soft rag!
Soak the electrode for 1 hour in 3mol/l KCl solution then perform the calibration procedure!
4. Silver sulphide deposits
Rinse the electrode with warm water then dry up gently using a soft rag!
Soak the electrode for 15 mins in 0.1 mol/l thiourea and 1.5 mol/l (5 %) hydrochloric acid (HCl)!
Rinse the electrode again with warm water then dry up gently using a soft rag!
Soak the electrode for 1 hour in 3mol/l KCl solution then perform the calibration procedure!
Note: when deposits are hard to remove try using hydrogen peroxide or sodium hypochlorite solutions.
Reactivation
Regeneration of the glass membrane:
The physical or chemical damage of the glass membrane slows down the operation of the electrode. The reactivation of the membrane helps restoring the normal
operation of the electrode.
Immerse ONLY the spherical part of the glass electrode into ammonium bifluoride with 10% concentration for 60 seconds then immediately
into 50-50% mixture of undiluted HCl and water for 10 seconds. This will neutralize the strong base!
Soak the electrode for 12 hours in 3 mol/l hydrochloric acid (HCl)!
Rinse the electrode with water then dry up gently using a soft rag!
Soak the electrode for 1 hour in 3mol/l KCl solution then perform the calibration procedure!