H. Elif KORMALI ERTÜRÜN

BAZI İÇECEKLERDE TİTRASYON ASİTLİĞİNİN TAYİNİ İÇİN ZOFENOPRİL KALSİYUMA DAYANAN pH ELEKTROT YAPIMI

Bu çalışmada, bazı içeceklerde titrasyon asitliğinin tayini için kullanılabilecek zofenopril kalsiyum’a (ZFNCa) dayanan yeni bir PVC membran pH elektrot geliştirilmiştir Elektrot, 20±1 °C’de, 1.7–9.5 pH aralığında, 44.1±1.7 mV/pH’lik bir eğim göstermektedir. Ayrıca, bu elektrodun, 15 s’lik cevap süresi ve en az 12 aylık ömürle, iyi bir tekrarlanabilirliğe ve yeniden üretilebilirliğe sahip olduğu gözlenmiştir. Aynı zamanda, çeşitli iyonlar varlığında H+ iyonuna karşı iyi bir seçicilik gösterdiği belirlenmiştir. Önerilen elektrot kullanılarak, bazı içeceklerdeki (portakal suyu, elma suyu, gazlı içecek, bira, şarap ve sirke) titrasyon asitliğinin tayininin yapılabileceği gösterilmiştir. Bulunan sonuçlar geleneksel cam pH elektrotla elde edilenlerle karşılaştırıldığında, %95 GS’de (güven seviyesi), aralarında anlamlı bir fark olmadığı belirlenmiştir. Sonuç olarak, ZFNCa’a dayanan bu elektrodun, içeceklerdeki titrasyon asitliği tayininde cam elektroda alternatif olarak başarıyla kullanılabildiği görülmüştür.

Anahtar Kelimeler:

PVC membran, pH elektrot, zofenopril kalsiyum, potansiyometri, pH ölçümü, titrasyon asitliği

CONSTRUCTION OF A pH ELECTRODE BASED ON ZOFENOPRIL CALCIUM FOR THE DETERMINATION OF TITRATABLE ACIDITY IN SOME BEVERAGES

In this study, a new PVC membrane pH electrode based on zofenopril calcium (ZFNCa) available for the determination of titratable acidity in some beverages was developed. The electrode exhibited a slope of 44.1±1.7 mV/pH in the pH range 1.7–9.5 at 20±1 °C. Furthermore, it was observed that the electrode had good repeatability and reproducibility with a response time of 15 s and a lifetime of at least 12 months. Also, it was found to display good selectivity for H+ ions in the presence of various ions. The applicability of the proposed electrode for the determination of titratable acidity in some beverages (orange juice, apple juice, fizzy drink, beer, wine and vinegar) was illustrated. It was seen that there were no significant differences between the results obtained with the proposed electrode and the traditional glass pH electrode at the 95% CL (confidence level). As a consequence, it was seen that the electrode based on ZFNCa could be successfully used as an alternative for glass electrode to determine the titratable acidity in beverages.

Keywords:

PVC membrane, pH electrode, zofenopril calcium, potentiometry, pH measurement, titratable acidity,

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