전위차 적정법에 의한 수중 입자성 물질의 등전점 측정 및 이에 대한 전위 결정 이온의 영향 = Measurement of the Point of Zero Charge of Particulate Matter in Aqueous Environment by Potentiometric Titration Method and the Influence of Potential-Determining Ion

다국어 초록 (Multilingual Abstract)

The experimental procedure for the measurement of the point of zero charge of particulate matters in aquatic environment by acid titration was investigated using titanium oxide as the target material. The measurement of the pzc`s of inorganic oxide, hydroxide, and silicate particles was shown to be possible by potentiometric titration observing the pH variation with the addition of acid solution. The pzc of TiO₂ was determined to be around pH 4.1 and Fe³⁺ ion was verified to be its cationic potential determining ion. When ferric ion was co-existed in solution, the pzc of TiO₂ was observed to be decreased by around 0.3 unit in pH from its original value. Considering the feasibility of the potentiometric titration method for the measurement of the pzc value of particles, it was expected that its applicability will be very wide and versatile for the systematic control and treatment of the particulate matters in water.

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