Probably this might be the problem. Look for an adequate electrode for your measurment. Any technical service person of electodes companys can help you choosing the best.
there can be lot of reasons for the same,
-pH meter deflections
-electrode deflections
-also might be some reactions going on in your mixture which may lead to pH change.
-Also, you should 1st check compatibility of your hydrocolloid with ethanol
It might be due to the type of hydrocolloid used or the hydrocolloid system acidic/basic might lead the change in pH with time in presence of alcohol or alcoholic (-OH) group.
I have consent with pooja and sonali comments. Actually the fluctuations is due to the compotation of inter molecular interactions of protic solvents. Some time it may arrives at higher concentration of your ethanol content complete saturation per unit area on the electrode surface. It reflects the deflection means to counter balance competitions due to surface saturation of OH- with inter molecular OH- group interaction. The problem can be solved by try to do this, make a dilute of your analyt or try to avoid such interaction with proper choice of aprotic solvents. if it is to be comes error again try to find out error in proper maintenance of reference electrode, please check the platinum electrode whether its corrode or refill the KCl saturated solution , donot mean wheat stone bridge in order to minimize such deflection in glass electrode, very long back after read it forget some science background of such fluctuations may Scoog analytical book reference may help you. All the best.
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