HI 4115 SILVER/SULFIDE COMBINATION SILVER/SULFIDE HI 4015 Instruction Manual HI 4015 HI 4115 Half-cell Combination Silver/Sulfide Ion Selective Electrode 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. The HI 4115 is a combination ion selective electrode. IIII. Specifications Type: Solid State electrode with a Silver/ Sulfide pellet. 2- Silver (Ag+), Sulfide (S ) Ion(s) measured: 1.
IV. Design elements of the HI 4015 and HI 4115 electrodes Cap SILVER/SULFIDE HI 4015 Sensor Handle Sensing Membrane V. Equipment required: • Hanna HI 5315 Double Junction Reference Electrode with HI 7072 Fill Solution for use with HI 4015. • 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). • Hanna HI 180 Magnetic Stirrer or equivalent with Teflon coated stirring bars (HI 731320).
tions. Standards with concentrations < 100 ppm should be made daily. Solutions for Sulfide Measurements SAOB, Hanna HI 4015-00 : Add content of SAOB reagent B bottle to the bottle with SAOB reagent A. Cap bottle and mix well until completely dissolved. Reagent that is brown has been oxidized and should be discarded. Sulfide Standards: Sulfide standards are susceptible to air oxidation and therefore are not commercially available.
• • Avoid large changes in temperature (thermal shock) as it may damage the sensor. Avoid leaving electrode in SAOB containing solutions for long periods of time as it will damage the electrode. 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). Deionized Water HI 4115 SULFIDE R/ SILSE ATION IN COMB VIII.
IX. Quick Check of Electrode Slope Ag+ • Connect sensors to pH/mV/ISE meter. • Place meter in mV mode. • Place 100 mL of deionized water into a beaker with stir bar. • Place electrode (s) into prepared sample. • Add 1 mL of a standard (0.1 M or 1078.7 ppm standard) to beaker. Record the mV value when stable. • Add an additional 10 mL of standard to the solution. Record the mV when reading has stabilized. This value should greater than the previous noted (more positive).
Procedure for Silver 1) Follow sections VIII and IX to prepare sensors for measurement. 2) Follow section VI to prepare standard solution. Standards should bracket and fall within the range of interest. Two mL HI 4000-00 ISA is added to 100 mL of both samples and standards for measurements equal or -4 above 10 M silver. At concentrations equal or less -4 than 10 M silver, prepare a separate calibration curve and use 1 mL of a diluted ISA in sample and stan12 dards.
Procedure for Sulfide 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. Fifty mL HI 4015-00 ISA is added to the beaker with 50 mL sample or standard. Add stir bar and mix thoroughly and continuously before making measurements. Protect these solutions from air and use promptly. 3) Follow section VII to optimize test set-up.
determined slopes at the temperature of measurement should be used if known. Example: Sulfide ion determination by sample subtraction. 1) A volume of standard solution of silver reagent (Vstd) (Cstd) plus ISA (VISA) is placed in a beaker with the sensor pair. The mV1 is recorded. 2) A known volume (Vsam) of the unknown sulfide sample is added (mV should change at least 10 – 30 mV). The new mV is recorded (mV2) and the difference is calibrated using the equation below ∆mV = mV2-mV1 .
Titration of Sulfide A silver/sulfide electrode may be used as an indicator to follow the progress of a sulfide titration with lead perchlorate. The lead perchlorate should be 10 to 20 times greater in concentration than that of the sulfide sample. The sample is first mixed with an equal volume of SAOB. During the titration the sensor follows the decrease in the sulfide concentration while small additions of lead perchlorate titrant are added and react with the sulfide ions.
MAN4115 03/07 WARRANTY Hanna Instruments Ion Selective Electrodes are warranted to be free of defects in material and workmanship for 6 months from date of purchase when used for their intended purpose and maintained according to instructions. If they fail to work when first used contact your dealer immediately. Damage due to accidents, misuse, misapplication, tampering or lack of prescribed maintenance is not covered.
