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Iridite ZDC Activator #113076 Page 2 <br /> 2. OPERATING, CONDITIONS <br /> Operating Concentration 50— 150 ml/L <br /> Temperature Ambient—80°C <br /> pH at Working Concentration 2.5-3.0 <br /> (can be adjusted —see solution control section) <br /> 3. SOLUTION MAKEUP <br /> Add slowly to water the required quantity of Iridite ZDC Activator while mixing <br /> effectively to produce a homogeneous solution. Following this, a solution analysis <br /> should be carried out in order to confirm the solution concentration. <br /> 4. SOLUTION ANALYSIS <br /> Sample Preparation <br /> Ensure the bath is mixed thoroughly before taking the sample and that the <br /> sample is then representative of the whole bath. Allow the bath to cool down to <br /> room temperature. If cloudy, allow to settle or filter with filter paper. <br /> pH Adjustment <br /> If due to plant or general processing circumstances it is found necessary to <br /> adjust or rebalance the operating pH value, it is recommended that either <br /> Ammonium Hydrogen Carbonate is used to increase the pH value or Citric Acid <br /> is used to lower the pH value. <br /> Analysis <br /> Titration —Total Acidity Method <br /> Reagents: <br /> • Phenolphthalein indicator <br /> • IN Sodium Hydroxide with 40 g/L of Sodium Citrate. <br /> [The 1 N Sodium Hydroxide plus citrate is prepared by starting with 1 N Sodium <br /> Hydroxide and adding analytical reagent sodium citrate and dissolving. Re- <br /> standardize the solution and adjust or just compensate for the slight change.] <br /> VacDarmill Inc., <br /> Telephone:800 Fax!M575Freight '79905ales OMGT � <br /> er Fne: <br /> 0 203-575-5916 <br /> t nr acdermidcom Pq <br />