Chloride Ion Determination in Fruit Juice

The matrix is complicated and the ionic strength in it is high. In order to avoid errors from these uncertainties, the use of standard addition or sample addition is recommended instead of direct potentiometry based on the calibration data. 

In order to select an optimal concentration value for the standard, however, a rough direct potentiometric measurement of the chloride concentration of the juice sample is recommended. After calibration, the slope value in the necessary range can also be obtained. 

Using calibration with standards and direct potentiometric measurement a rough estimation of the sample concentration is done and also the slope of the electrode response (5) is determined. 

The standard of 50 cm Q concentration is introduced into the sample half-cell and the steady cell voltage E ) is measured. After Tg volume (no more than 2 cm ) of the fruit juice sample is added, the solution is homogenized and steady reading of the cell voltage ( g) is taken. 

From these values, the Cg sample concentration is calculated. 

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