Sulu Çözeltilerde Hg2+ Tespiti için Sinnamaldehit Türevi Bir Kolorimetrik Sensör

Ağır metal iyonları insan gıda zincirine girdiklerinde insanın merkezi sinir sistemine, karaciğerine, böbreğine, kemiğine ve dişlerine ciddi zararlar vermektedir. Bu nedenle, toksik metal iyonlarının basit, hızlı, hassas ve düşük maliyetli tanımlanması için yeni tekniklerin geliştirilmesi halk sağlığının iyileştirilmesi için gereklidir. Ağır metal iyonlarının kolorimetik sensörler yardımıyla çıplak gözle algılanması, her insan tarafından uygulanabilirliği nedeniyle önem taşımaktadır. Bu çalışmada, kolay uygulama potansiyeli olan 3-methyl-4-((3-phenylallylidene)amino)phenol (SAR) bileşiğinin sensör özelliği incelenmiştir. Sensörün yapısı, 1H NMR, 13C NMR ve kütle spektrometresi ile doğrulanmıştır. Uygulamalarda, ilk olarak sensörün rengi metal iyonlarıyla / metal iyonları olmadan karşılaştırılmış, daha sonra ölçümler UV-Vis spektrofotometresinde yapılmıştır. UV-Vis spektroskopik çalışmaları, SAR'ın MeOH (metanol) / H2O (su) (v/ v 1: 1) içerisinde Hg2+ iyonlarına yüksek seçicilik ve duyarlılığı gösterdiğini ortaya koymuştur. Sensör, sarıdan pembeye renk değiştirerek Hg2+ iyonlarını algılamıştır. SAR ve Hg2+ arasındaki kompleks stokiyometrisi, Job yöntemi ve 528 nm'de UV-Vis titrasyon değerleri kullanılarak hesaplanmış ve 2:1 olarak bulunmuştur. Bağlanma sabiti 1.56 × 1012 M-2 olarak bulunmuştur. Ayrıca, sensör ve Hg2+ arasındaki bağlanma tersinirdir. Tespit sınırı da belirlenmiş ve 7.89 × 10-6 M olarak hesaplanmıştır.

Anahtar Kelimeler:

Sinamaldehit, kolorimetrik, Hg2+, sensör

A Cinnamaldehyde-based Colorimetric Sensor for Hg2+ Detection in Aqueous Solutions

When heavy metal ions join the human food chain, they cause severe harm to the human liver, bone, kidney, teeth, and central nervous system. Therefore, the development of new techniques for rapid, easy, simple, reliable, and low-cost identification of toxic metal ions is a key point for improving public health. Naked eye detection of hazardous metal ions with colorimetric sensors has been gained attention due to its applicability among common people. In this study, the sensor properties of 3-methyl-4-((3-phenylallylidene)amino)phenol (SAR) were investigated. The structure of the sensor were verified by Mass spectrometry, 1H NMR, and 13C NMR. In the applications, firstly the color of the sensor was compared with/without metal ions, then the measurements were made in the UV-Vis spectrophotometer. UV-Vis spectroscopic studies exhibit that SAR shows excellent sensitivity and selectivity to Hg2+ ions in MeOH (methanol) / H2O (water) (v/v, 1:1). SAR can detect Hg2+ ions by color change from yellow to pink. Job's method and UV-Vis titration values at 528 nm were used to determine the complex stoichiometry between SAR and Hg2+ and the complex (SAR/Hg2+) stoichiometry was found to be 2:1. The binding constant was found to be 1.56 х 1012 M-2. Additionally, the binding between the sensor and Hg2+ was reversible. The limit of detection was also determined and calculated as 7.89 × 10-6 M.

Keywords:

Cinnamaldehyde, colorimetric, sensor, Hg2+,

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