User manual HANNA INSTRUMENTS HI 4115

[. . . ] HI 4115 SILVER/SULFIDE COMBINATION HI 4015 SILVER/SULFIDE Instruction Manual HI 4015 HI 4115 Silver/Sulfide Ion Selective Electrode Half-cell Combination 1 HI 4015 Silver/ Sulfide Half-cell HI 4115 Silver/ Sulfide Combination Electrode I. Introduction: The Hanna HI 4015 and HI 4115 are ion selective electrodes designed for the measurement of Silver/ Sulfide ions in aqueous solutions. The HI 4015 is a solid state half-cell sensor that requires a separate reference. II Specifications Type: Solid State electrode with a Silver/ Sulfide pellet. [. . . ] Prepare reference electrode by filling outer electrolyte reservoir with HI 7072. Place sensor and reference electrodes into electrode holder and connect cable connectors to meter. Unwrap plastic film seal found over ceramic junction on inner stem and discard. Rinse inner stem with deionized water making certain to wet the o-ring found on the inner stem. 6. Holding the body of the electrode gently press upper cap with your thumb. (You may need to gently assist for this to occur). 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. 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 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 4115 SULFIDE R/ SILSE ATION IN COMB IX. Quick Check of Electrode Slope Ag+ · Connect sensors to pH/mV/ISE meter. · Add 1 mL of a standard (0. 1 M or 1078. 7 ppm standard) to beaker. If sensor does not have appropriate mV change, corrective action must be taken. · Place 50 mL of deareated water into a beaker with 50 mL of the premixed SAOB, Hanna HI 4015-00. An acceptable value for this slope is -28± 4 mV for freshly made solution. Solution exposed to air will be degraded and lower slopes will be observed. If sensor does not have appropriate mV change, corrective action must be taken. 10 X. Corrective action · Verify protective cap has been removed. (HI 4015) · Verify plastic film has been removed from inner stem. (HI 4115) · Verify electrodes are connected properly to meter and meter is powered. · Verify SAOB was added to sulfide standards and they have been stored appropriately. · If the silver sensor slope just misses the suggested slope window, soaking the sensor in a dilute standard may solve the problem. · A scratched sensing surface can be polished with HI 4000-70 polishing strip. Wet the frosted side with deionized water and place against damaged membrane of the electrode. [. . . ] The new mV is recorded (mV2) and the difference is calibrated using the equation below mV = mV2-mV1 . 3) The unknown sulfide concentration in the sample (Csam) can then be determined by the following equation. For an example a sensor is placed into 100 mL of a 0. 001 M Ag+ standard. n= ½ because ½ mole of sulfide reactions with 1 mole of silver ion. Titration of Chloride A silver electrode may be used as an indicator to follow the progress of a chloride (or other halide) titration with silver nitrate. [. . . ]