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Summary of Contents for EUTECH INSTRUMENTS SODIUM GLASS
- Page 1 Instruction Manual Sodium Electrode EUTECH INSTRUMENTS PTE LTD. INSTRUCTION MANUAL SODIUM ION ELECTRODE...
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Page 2: Table Of Contents
Sodium Electrode Instruction Manual TABLE OF CONTENTS GENERAL INSTRUCTIONS ......................1 ..........................1 EQUIRED QUIPMENT ..........................1 EQUIRED OLUTIONS GENERAL PREPARATION......................2 ..........................2 LECTRODE REPARATION ) ..................2 LECTRODE LOPE HECK WITH P METER ) .....................2 LECTRODE LOPE HECK WITH ION METER MEASUREMENT..........................3 ............................3 EASURING INTS... -
Page 3: General Instructions
SODIUM ION ELECTRODE INSTRUCTION MANUAL GENERAL INSTRUCTIONS Eutech Instruments Sodium Ion Electrode is used to measure sodium ions in aqueous solutions quickly, simply, accurately, and economically. Required Equipment A pH/mV meter or an ion meter, either line operated or portable. -
Page 4: General Preparation
Sodium Electrode Instruction Manual Eutech Sodium Standard, 100 ppm Na , Code no. EC-SCS-LNA3-BT. To prepare this solution from your own laboratory stock, half fill a one liter volumetric flask with distilled water and add 0.254 grams of reagent grade NaCl. Swirl the flask to dissolve the solid. -
Page 5: Measurement
Instruction Manual Sodium Electrode Rinse the electrodes with the electrode rinse solution and blot dry. To another 150 ml beaker, add 100 ml of the higher value standard and 2 ml of ISA. Place the beaker on a magnetic stirrer and begin stirring at a constant rate. Lower the electrode tips into the solution. -
Page 6: Measurement Procedure
Sodium Electrode Instruction Manual TABLE 1: Concentration Unit Conversion Factors ppm Na moles/liter Na 1.0 x 10 - 229.90 1.0 x 10 - 22.99 1.0 x 10 - 2.30 MEASUREMENT PROCEDURE Direct Measurement Direct measurement is a simple procedure for measuring a large number of samples. A single meter reading is all that is required for each sample. -
Page 7: Direct Measurement Of Sodium (Using An Ion Meter)
Instruction Manual Sodium Electrode A calibration curve is constructed on semi-logarithmic paper when using a pH/mV meter in the millivolt mode. The measured electrode potential in mV (linear axis) is plotted against the standard concentration (log axis). In the linear region of the curve, only three standards are necessary to determine a calibration curve. -
Page 8: Low Level Sodium Determination (Using A Ph/Mv Meter)
Sodium Electrode Instruction Manual After rinsing the electrodes and blotting dry, place the electrode tips in the solution and wait for the reading to stabilize. Read the concentration directly from the meter display. The calibration should be checked every two hours. Assuming no change in ambient temperature, place the electrode tips in the first sodium standard. -
Page 9: Low Level Sodium Determination (Using An Ion Meter)
Instruction Manual Sodium Electrode On semi-logarithmic graph paper, plot the millivolt reading (linear axis) against the concentration (log axis) as in Figure 1. Rinse the electrodes with electrode rinse solution and blot dry. To a 150 ml plastic beaker add 100 ml of sample and 1 ml of low level ISA. Place the beaker on the magnetic stirrer and begin stirring. -
Page 10: Temperature Influences
Sodium Electrode Instruction Manual 1.1X10 1.1X10 1.8X10 1.8X10 0.0001 ppm 0.001 ppm 0.01 ppm 4.5X10 4.5X10 Temperature Influences Samples and standards should be at the same temperature, since electrode potentials are influenced by changes in temperature. A 1 C difference in temperature results in a 2% error at the 10 M level. -
Page 11: Limits Of Detection
Instruction Manual Sodium Electrode Limits of Detection The upper limit of detection in pure sodium solutions is 1M. In the presence of other ions, the upper limit of detection is above 10 M sodium, but two factors influence this upper limit. Both the possibility of a liquid junction potential developing at the reference electrode and the salt extraction effect influence this upper limit. -
Page 12: Electrode Life
Sodium Electrode Instruction Manual The edge of the shaded area (the straight line) shown in Figure 3 indicates a minimum pH at which dilute sodium measurements can be made with less than 10% hydrogen ion interference. The pH should be adjusted to a pH greater than 9 by the addition of ISA to all standards and samples for optimal results over the entire concentration range of sodium. -
Page 13: Troubleshooting Guide
Instruction Manual Sodium Electrode In the case of high and constant ionic strength relative to the sensed ion concentration, the activity coefficient, γ , is constant and the activity, X, is directly proportional to the concentration. To adjust the background ionic strength to a high and constant value, ionic strength adjuster is added to samples and standards. -
Page 14: Standards And Reagents
General Preparation and Electrode Refer to the instruction manual. Reread sections on Characteristics . If trouble still persists, please call Eutech Instruments Pte Ltd. at (65) 6778-6876 and ask for the Customer Services Department. -
Page 15: Troubleshooting Hints
Instruction Manual Sodium Electrode TROUBLESHOOTING HINTS Symptom Possible Causes Next Step Out of Range Reading defective meter check meter with shorting strap (see meter instruction manual) defective electrode check electrode operation electrodes not plugged in unplug electrodes and reset properly reference electrode not filled replenish reference filling solution electrodes not in solution... -
Page 16: Specifications
Sodium Electrode Instruction Manual SPECIFICATIONS Saturated to 1.0 x 10 - Concentration Range: M (0.02 ppm) pH Range: 5 to 12 (depending on Na level) Temperature Range: to 70 Resistance: < 200 Mohm ±2% Reproducibility: Size: 110 mm length; 12 mm diameter; 1 m cable length Storage: Store in 5M NaCl with added ISA ORDERING INFORMATION...
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