Related Manuals for Hanna Instruments HI 4112
Summary of Contents for Hanna Instruments HI 4112
- Page 1 HI 4012 Instruction Manual HI 4012 HI 4012 HI 4012 HI 4012 HI 4012 Half-cell HI 4112 HI 4112 HI 4112 HI 4112 HI 4112 Combination Lead Ion Selective Electrode...
- Page 2 HI 4012 Lead Half-cell HI 4012 Lead Half-cell HI 4012 Lead Half-cell HI 4012 Lead Half-cell HI 4012 Lead Half-cell HI 4112 Lead Combination Electrode HI 4112 Lead Combination Electrode HI 4112 Lead Combination Electrode HI 4112 Lead Combination Electrode HI 4112 Lead Combination Electrode I.
- Page 3 III. III. III. III. III. Theory of Operation Theory of Operation Theory of Operation Theory of Operation Theory of Operation: : : : : The HI 4012 or HI 4112 lead electrodes are potentiometric devices used for the rapid determination of free lead ions in plating baths and as a detector for the titration of sulfate or thorium with lead perchlorate Lead sensors are “elec-...
- Page 4 IV. IV. IV. IV. IV. Design elements of the HI 4012 and HI 4112 Design elements of the HI 4012 and HI 4112 Design elements of the HI 4012 and HI 4112 Design elements of the HI 4012 and HI 4112 Design elements of the HI 4012 and HI 4112 electrodes electrodes...
- Page 5 V. V. V. V. V. Equipment required: Equipment required: Equipment required: Equipment required: Equipment required: Hanna HI 5315 Double Junction Reference Electrode with HI 7072 Fill Solution for HI 4012. Hanna HI 4222 pH/ISE/mV meter or other suitable ion or pH/mV meter. (Note: log/linear graph paper is useful if an ISE (ion) meter is not available).
- Page 6 VII VII VII VII VII. General Guidelines General Guidelines General Guidelines General Guidelines General Guidelines Use of a hood and protective clothings is advised when handling lead solutions. Concentrated samples (>0.10 M) should be diluted before measurement. Multiply the final result by the corresponding dilution factor.
- Page 7 Gas bubbles may form from solution out-gassing due to temperature change. Gently tap body of sensor to dislodge them from sensing membrane. HI 4012 Remove protective cover from sensor tip. HI 4112 Remove the protective plastic wrap that covers the ceramic junction before assembling sensor for the first time.
- Page 8 VIII. VIII. Electrode Preparation VIII. Electrode Preparation Electrode Preparation Electrode Preparation VIII. VIII. Electrode Preparation HI 4012 1. Remove protective cover from sensor tip. 2. Prepare reference electrode by filling outer electrolyte reservoir with HI 7072. 3. Place sensor and reference electrodes into electrode holder and connect cable connectors to meter.
- Page 9 6. Holding the body of the electrode gently press upper cap with your thumb. This permits the fill solution to drain out of the body. Release cap and verify elec- trode returns to its original position. (You may need to gently assist for this to occur).
- Page 10 IX. IX. IX. IX. IX. Quick Check of Electrode Slope Quick Check of Electrode Slope Quick Check of Electrode Slope Quick Check of Electrode Slope Quick Check of Electrode Slope Use of a hood and protective clothing is strongly advised. Connect sensors to pH/mV/ISE meter Place meter in mV mode.
- Page 11 applying gentle pressure. Continue polishing until you are satisfied with the surface. If dark deposits appear on polishing strip move the paper slightly and continue polishing. If the membrane is damaged, the response becomes extremely sluggish, or the slope of the electrode has decreased significantly, and procedures above have not helped, the sensor should be replaced.
- Page 12 Procedure 1) Follow sections VIII and IX to prepare sensors for measurement. 2) Follow section VI to prepare standards / solution. Standards should bracket and fall within the range of interest. Two mL HI 4012-00 ISA is added to 50 mL of both samples and standards.
- Page 13 This technique is called Known Addition. The method can use an ideal sensor slope, but actual determined slopes at the temperature of measurement should be used if known. The volume and concentration of the added standard must cause a mV change of at least 8 mV. This method is preprogrammed in the Hanna HI 4222 pH/ISE/mV meter, which simplifies the method greatly.
- Page 14 the sulfate ions forming a precipitate. <—> PbSO + SO 4 (insoluble) At the stoichiometric end point, a change in mV occurs. Measurements may be automated by use of the Hanna Titrator HI 901 or titrated manually. Plot generated on Hanna HI 901 Titrator during Plot generated on Hanna HI 901 Titrator during Plot generated on Hanna HI 901 Titrator during Plot generated on Hanna HI 901 Titrator during...
- Page 15 Plot generated on Hanna HI 901 Titrator during Plot generated on Hanna HI 901 Titrator during Plot generated on Hanna HI 901 Titrator during Plot generated on Hanna HI 901 Titrator during Plot generated on Hanna HI 901 Titrator during automated lead titration using HI 4112 electrode.
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Page 16: Warranty
Damage due to accidents, misuse, misapplication, tampering or lack of prescribed maintenance is not covered. Hanna Instruments reserves the right to modify the design, construction or appearance of its products without advance notice.
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