User manual HANNA INSTRUMENTS HI 4112

[. . . ] HI 4112 LEAD/SULFATE COMBINATION HI 4012 Instruction Manual HI 4012 HI 4112 Lead Ion Selective Electrode Half-cell Combination 1 LEAD/SULFATE HI 4012 Lead Half-cell HI 4112 Lead Combination Electrode I. Introduction: The Hanna HI 4012 and HI 4112 are ion selective electrodes designed for the measurement of Lead ions in aqueous solutions. The HI 4012 is a solid state half-cell sensor that requires a separate reference. The HI 4112 is a combination ion selective electrode. [. . . ] Unwrap plastic film seal found over ceramic junction on inner stem and discard. This is only used for shipping and long term storage. Rinse inner stem with deionized water making certain to wet the o-ring found on the inner stem. Deionized Water Remove Parafilm 3. Reassemble electrode by gently pushing the inner assembly into the outer body, sliding spring down cable, and screwing cap into place. Remove fill hole cover and o-ring on fill hole spout. Using the dropper pipette provided, add a few drops HI 7072 fill solution to the electrode, wetting the oring and rinsing out the fill solution chamber. 8 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 electrode returns to its original position. (You may need to gently assist for this to occur). 7. Tighten the electrode cap onto the body and fill electrode body until fill solution volume is just below fill hole. Position electrode in a Hanna HI 76404 electrode holder (or equivalent) and connect plug to meter. 9 HI 4112 ULFATE LEAD/S ATION IN COMB IX. 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. · Place 50 mL of deionized water into a beaker with stir bar and 2 mL of HI 4012-00 ISA. Add 50 mL of the methanol/Formalin mixture. Add stir bar and place on magnetic stirrer. · Place electrodes into prepared sample. · Add 1 mL of the stock standard HI 4012-01 (or . 01 M or . 001 M standard by dilution) to the beaker. Record the mV value when reading has stabilized. · Add an additional 10 mL of standard HI 4012-01 (or same dilute standard) to the solution. Record the mV when reading has stabilized. [. . . ] · Addition of ISA is suggested (2mL/50mL sample). · pH adjustment of the sample to 4-6 range is advised. If required, use perchloric acid or sodium hydroxide. · The lead titrant should be 10X more concentrated than the expected sulfate and should be standardized against a standard sulfate solution. [. . . ]