HI 4109 CYANIDE COMBINATION CYANIDE HI 4009 Instruction Manual HI 4009 HI 4109 Half-cell Combination Cyanide Ion Selective Electrode 1
HI 4009 Cyanide Half-cell HI 4109 Cyanide Combination Electrode I. Introduction: The Hanna HI 4009 and HI 4109 are ion selective electrodes designed for the measurement of Cyanide ions in aqueous solutions. The HI 4009 is a solid state half-cell sensor that requires a separate reference. The HI 4109 is a combination ion selective electrode. IIII. Specifications Type: Solid State electrode with a Silver halide pellet. Cyanide (CN ) Ion(s) measured: Measurement range: 10-2 M to 1X 10-6 M 260 to 0.
III. Theory of Operation Operation:: The HI 4009 or HI 4109 Cyanide electrodes are potentiometric devices used for the rapid determination of free Cyanide ions in effluent, for electroplating bath analysis and as a detector for titration of cyanide with silver nitrate. The electrode functions as a sensor or ionic conductor. The HI 4009 requires a separate reference electrode to complete its electrolytic circuit. The HI 4109 incorporates a reference electrode.
IV.
V. Equipment required: • Hanna HI 5315 Double Junction Reference Electrode with HI 7072 Fill Solution for HI 4009. • 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 TFE coated stirring bars (HI 731320). Note: isolate beakers from stirrer motor heat by placing insulating material such as foam or cork between them.
capped plastic bottle. Using volumetric pipettes and glassware make dilutions to bracket the concentration of the samples. Store standards in plastic bottles. Standards with concentrations < 10-3M should be prepared daily. One mL of Hanna ISA and pH adjuster (HI 4001-00) should be added to each 100 mL of sample or standard. VII VII. General Guidelines • Use of a hood and protective clothings is strongly advised. Use ISA to adjust pH above 11.
HI 4000-70. Avoid large changes in temperature (thermal shock) as it may damage the sensor. • Gas bubbles may form from solution out-gassing due to temperature change. Gently tap body of sensor to dislodge them from sensing membrane. HI 4009 • Remove protective cover from sensor tip. • Prepare HI 5315 reference electrode by filling electrolyte reservoir with HI 7072 fill solution. • Place sensor and reference electrodes into electrode holder and connect cable connectors to meter.
Deionized Water VIII. Electrode Preparation HI 4009 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. HI 4109 1. Unwrap plastic film seal found over ceramic junction on inner stem and discard. This is only used for shipping and long term storage. 2.
HI 4109 E CYANID TION NA COMBI 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. 8. Position electrode in a Hanna HI 76404 electrode holder (or equivalent) and connect plug to meter.
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 100 mL of deionized water into a beaker with stir bar and 1 mL of HI 4001-00 ISA. • Place electrodes into prepared sample. • Add 1 mL of the stock standard (either M or ppm) to the beaker. Record the mV value when stable. • Add an additional 10 mL of stock standard to the solution. Record the mV when reading has stabilized.
• 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. XI. Direct Calibration and Measurement This method is a simple procedure for measuring many samples. Use of a hood and protective clothing is strongly advised when handling cyanide samples and standards.
Procedure Follow sections VIII and IX to prepare sensors for measurement. Follow section VI to prepare standards / solution. Standards should bracket and fall within the range of interest. One mL HI 4001-00 ISA is added to 100 mL of both samples and standards Add stir bar and mix before taking measurements. Follow section VII; General Guidelines to optimize test set-up. During calibration it is best to start with lower concentration samples first. Wait for a stable measurement before recording values.
XII. Other Measurement TTechniques echniques Known Addition (for CN-) An unknown concentration can be determined by adding a known amount (volume and concentration) of measured ion to a known volume of the sample. 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 30 mV.
Titration A cyanide electrode may be used as an indicator to follow the progress and detect the endpoint of a complexation titration of CN- with silver nitrate standard. Time must be allowed for the alkali salt to redissolve and mV to settle. The end point is reached when the formation of insoluble silver cyanoargentate precipitates occurs. The electrode can be used in colored samples, or high or variable ionic strength samples to increase accuracy of the determination.
sensor membrane. Store dry disassembled electrode in storage box provided with electrode. XV ables XV.. Conversion TTables For CN- Multiply by Moles/L (M) to ppm (mg/L) ppm (mg/L) to M (moles/L) 2.602 x 104 3.843 x 10-5 XVI. Disposal of Cyanides Sodium Cyanide is a deadly poison and extreme care must be taken during use and in disposal after use. Test solutions and standards may be neutralized before discharging. Consult your waste manager for exact procedures. The overview of the process is below.
MAN4109 03/09R2 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.
