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Sodium determination by direct potentiometry made easy with Metrohm's two Na ISE by Metrohm AG
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Searched and foundag aqueous bridge tap by din cables directions dry and store f 6 ise mea metrohm metrohm price na nas ph ion price of metrohm proton reference electrodes shaft material shafts material sodium sodium chloride timing order urinal water taps
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sodium determination by direct potentiometry made easy with metrohms two na ises
| sodium determination by direct potentiometry now even simpler and more selective direct measurement the determination of sodium with the sodium ise is a selective rapid accurate and favorably-priced method as is the case for all ion-selective electrodes the na ise senses the ionic activity which can therefore be measured directly in the sample solution however the influence of possible interfering ions must be taken into account for real samples information about the ionic strength of the solution is normally not available this means that the activity coefficient of the measuring ion is not known as a result the measured potential can be used to determine the activity but not to determine the normally required concentration of the respective ion however in such cases a simple sample preparation step allows the concentration to be determined by direct potentiometry work is carried out with a solution of fixed ionic strength both the calibration standards and the sample are treated with
| brane ise it is also no longer necessary to work with a double-junction reference electrode the use of ckcl 3 mol/l as the reference electrolyte provides excellent results as far as correctness and precision are concerned this means that a bridge electrolyte such as is used with the glass electrode tisab solution is superfluous as mentioned above the polymer membrane ise is characterized by its outstanding selectivity for na ions the cross-sensitivity towards other cations with the same charge and a similar ionic size and towards protons in particular is greatly reduced in comparison with the glass electrode this means that the polymer membrane electrode can be used within a considerably larger ph range it also provides correct values in neutral and acidic solutions a long conditioning period for the membrane before use is no longer necessary with the new sodium ise rinsing the electrode with distilled water prior to the meas urement is completely adequate i.e the polymer membrane ise
| 40093 subject to modifications printed by metrohm ltd herisau 2001-09 4 ion-selective sodium electrodes
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