ไฮดรอกซีแอพาไทต์ดัดแปรเพื่อเป็นอุปกรณ์รับรู้เพื่อตรวจวัดแคดเมียม (II) ไอออน
A new colorimetric method for the detection of cadmium ion in aqueous solution was developed using hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂) modified with dithizone as a solid sensor. Hydroxyapatite was successfully prepared and characterized by FT-IR and XRD prior to the modification with dithizone. The col...
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| 格式: | Senior Project |
| 語言: | Thai |
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จุฬาลงกรณ์มหาวิทยาลัย
2017
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| 主題: | |
| 在線閱讀: | https://digiverse.chula.ac.th/Info/item/dc:10127 |
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| 機構: | Chulalongkorn University |
| 語言: | Thai |
| 總結: | A new colorimetric method for the detection of cadmium ion in aqueous solution was developed using hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂) modified with dithizone as a solid sensor. Hydroxyapatite was successfully prepared and characterized by FT-IR and XRD prior to the modification with dithizone. The color change of dithizone-hydroxyapatite was based on the complexation between cadmium ion and dithizone. The color of modified hydroxyapatite changed from pale yellow to orange, with increasing concentration of cadmium ion. The color was observed by naked eye and the color intensity was determined by Image J program. The effect of various parameters including dithizone concentration, detection time, initial pH of the cadmium solution and interfering metal ions were investigated. The suitable condition to prepare the materials was by using 0.18 mM dithizone solution. The suitable pH for detection was pH 7 and the detection time was 5 min. By using the proposed method, the linear range for cadmium ions detection was in the range of 20-80 ppb. The limit of detection was 20 ppb by naked eyes. |
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