PASCO CI-6734 - Manuals

Sodium Ion Selective Electrode 012–06615A 2 RO O1013 SAMPL E 4MKCI Refe rence Fill Solutio n Figure 1.Included Equipment to ISEAmplifier Sodium Ion SelectiveElectrode filling pipette fillingsolution To adjust the background ionic strength to a high and constant value, ionic strength adjuster is adde...

012–06615A Sodium Ion Selective Electrode 3 ä Note: Electrodes must not be stored in distilled water or air. Do not rinse withdistilled water. • Dilute Electrode Rinse Solution To prepare this solution from your own laboratory stock, add 20 ml of ISA to a one liter volumetric flask and fill to the m...

Sodium Ion Selective Electrode 012–06615A 4 General Preparation Electrode Preparation 1. Remove the rubber cap covering the electrode tip and the rubber insert covering the filling hole of the Sodium Ion Selective Electrode. Fill the electrode with the included filling solution to a level just below...

012–06615A Sodium Ion Selective Electrode 5 Measurement Measuring Hints • All samples and standards should be at the same temperature for precise measurement, preferably ambient temperature. A difference of l °C in temperature will result in about a 2% measurement error. The electrodes should not be...

Sodium Ion Selective Electrode 012–06615A 6 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. The ionic strength of samples and standards should be made the same b...

012–06615A Sodium Ion Selective Electrode 7 Figure 3Typical sodium electrode calibration curve 6. To a clean, dry 150 ml beaker, add 100 ml of sample and 2 ml of ISA. Place the beaker on the magnetic stirrer and begin stirring. After rinsing the electrode tip with electrode rinse solution, blot dry ...

Sodium Ion Selective Electrode 012–06615A 8 6. Add increments of the l.0xl0 -3 M or 100 ppm standard as given in Table 2 below. 7. After the reading has stabilized, record the Voltage reading in the Digits display after each addition. TABLE 2: Step-wise Calibration for Low Level Sodium Measurements ...

012–06615A Sodium Ion Selective Electrode 9 Electrode drift and slow response could indicate the presence of high interference from the ions listed. Soak the electrodes in electrode storage solution when this happens to restore proper response. See Measuring Hints section. TABLE 3: Levels of Interfe...

Sodium Ion Selective Electrode 012–06615A 10 Electrode Response Plotting the electrode potential against the sodium concentration on semilogarithmic paper results in a straight line with a slope of about 59 mV per decade. (Refer to Figure 1.) The time needed to reach 99% of the stable electrode pote...

012–06615A Sodium Ion Selective Electrode 11 Figure 5Electrode potential behavior vs. solution pH in pure NaCl solution at 25 ° The edge of the shaded area (the straight line) shown in Figure 5 indicates a minimum pH at which dilute sodium measurements can be made with less than 10% hydrogen ion int...

Sodium Ion Selective Electrode 012–06615A 12 Specifications Concentration Range: Saturated to 1.0Xl0 -6 M (0.02 ppm) pH Range: 5 to 12 (depending on pH level) Temperature Range: -5 °C – 70 °C Resistance: < 200 mohm Reproducibility: ±2% Storage: store in 5 M NaCl with added ISA Size: length = 110 ...

012–06615A Sodium Ion Selective Electrode 13 Standards & Reagents Whenever problems arise with the measuring procedure that has been used successfully in the past, be Sure to check the standard and reagent solutions. If in doubt about the credibility of any of the solutions, prepare them again. ...

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