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Method development for determination of Iodide ion in egg using electrochemical techniques

หน่วยงาน จุฬาลงกรณ์มหาวิทยาลัย

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ชื่อเรื่อง : Method development for determination of Iodide ion in egg using electrochemical techniques
นักวิจัย : Piyada Suwandittakul
คำค้น : Iodides , Ions , Electrochemistry
หน่วยงาน : จุฬาลงกรณ์มหาวิทยาลัย
ผู้ร่วมงาน : Pakorn Varanusupakul , Orawan Chailapakul , Chulalongkorn University. Faculty of Science
ปีพิมพ์ : 2549
อ้างอิง : http://cuir.car.chula.ac.th/handle/123456789/14491
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Thesis (M.Sc.)--Chulalongkorn University, 2006

The electrochemical detection with flow injection (FI) system was developed for the determination of iodide ion in egg samples. The oxidation potential of iodide was investigated using cyclic voltammetry (CV) in 60mM phosphate buffer (pH 5). The experiments were compared between using boron-doped diamond (BDD) and using glassy carbon electrodes (GC). It was found that both electrodes provided well-defined cyclic voltammograms. However, the background current of BDD electrode was much lower than the background current of GC electrode. The BDD electrode was selected as working electrode for this work. The pulsed potential waveform was also studied and applied with flow injection amperometric detection in order to improve the stability of the signal that might affected by the adsorption of electrochemical species at the electrode surface. The optimized pulsed potential waveform parameters were 0.8 V detection potential; 30 msec delay time; 30 msec integration time; 1.2 V oxidation potential; 700 msec oxidation time; 1.1 V reduction potential; and 30 msec reduction time. The FI-PAD-BDD was carried out in 60 mM phosphate buffer pH 5 at flow rate of 1 ml/min. The method was evaluated with standard iodide. The linear dynamic range was 50 to 2000 mug/L. The limit of detection and the limit of quantitation were 5.4 mug/L and 16.5 mug/L, respectively. The recovery was 114% with 6% RSD. The method was intended to apply for determination of iodide in egg sample after alkali dry ashing; however, there was a problem with the incompatibility of the matrix to the electrochemical system. Alternatively, microdialysis sampling was attempted in order to retrieve iodide ion from egg samples. The preliminary results of iodide in egg samples obtained from both microdialysis with FI-PAD-BDD method (1.06 mug/g of egg with 6% RSD) and alkali dry ashing with catalytic colorimetric method (1.11 mug/g of egg with 0.1% RSD) were comparable.

บรรณานุกรม :
Piyada Suwandittakul . (2549). Method development for determination of Iodide ion in egg using electrochemical techniques.
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Piyada Suwandittakul . 2549. "Method development for determination of Iodide ion in egg using electrochemical techniques".
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Piyada Suwandittakul . "Method development for determination of Iodide ion in egg using electrochemical techniques."
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย, 2549. Print.
Piyada Suwandittakul . Method development for determination of Iodide ion in egg using electrochemical techniques. กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย; 2549.