ISO 3894:2005 pdf download.Road vehicles - Wheels/rims for commercial vehicles --- Test methods.
5 APPARATUS
Ordinary laboratory apparatus and
5.1 Potentiometric titration apparatus, comprising
5.1.1 Potentiometer, sensitivity 2 mV, covering the range
—500to+500mV.
5.1.2 Calomel electrode, fitted with a safety reservoir,
filled with saturated potassium chloride solution.
5.1.3 BrIdge, containing a saturated potassium nitrate solution, connected to the calomel electrode (5.1.2), fitted at the ends with porous plugs.
NOTE — This bridge is not necessary if silver and mercury(I) sulphate electrodes are used.
5.1.4 Silver electrode.
NOTE — For the determination of chloride Ions contents below 0,001 % (mm/m). use a silver electrode coated with a layer of silver chloride Instead of the ordinary silver electrode. Prepare this electrode as follows: electrolyse a 01 N hydrochloric acid solution for about 30 mm at a current density of 0,4 mA/cm2, using a silver electrode (5.1.4) immersed to a depth of about 5 cm as the anode and a platinum electrode as the cathode. Thoroughly wash the prepared electrode first under running water for at least 24 h then with distilled water.
5.2 Magnetic stirrer, with a polytetrafl uoroethylene (PTFE)-coated rod.
Ordinary laboratory apparatus and
5.1 Potentiometric titration apparatus, comprising
5.1.1 Potentiometer, sensitivity 2 mV, covering the range
—500to+500mV.
5.1.2 Calomel electrode, fitted with a safety reservoir,
filled with saturated potassium chloride solution.
5.1.3 BrIdge, containing a saturated potassium nitrate solution, connected to the calomel electrode (5.1.2), fitted at the ends with porous plugs.
NOTE — This bridge is not necessary if silver and mercury(I) sulphate electrodes are used.
5.1.4 Silver electrode.
NOTE — For the determination of chloride Ions contents below 0,001 % (mm/m). use a silver electrode coated with a layer of silver chloride Instead of the ordinary silver electrode. Prepare this electrode as follows: electrolyse a 01 N hydrochloric acid solution for about 30 mm at a current density of 0,4 mA/cm2, using a silver electrode (5.1.4) immersed to a depth of about 5 cm as the anode and a platinum electrode as the cathode. Thoroughly wash the prepared electrode first under running water for at least 24 h then with distilled water.
5.2 Magnetic stirrer, with a polytetrafl uoroethylene (PTFE)-coated rod.
