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

Yıl 2017, Cilt: 42 Sayı: 3, 211 - 218, 15.06.2017

H. Elif Kormalı Ertürün

Öz

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

Öz

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. 

Anahtar Kelimeler

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

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