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ผลงานตีพิมพ์ในวารสารวิชาการA rapid spectrophotometric method for quantitative determination of ethanol in fermentation productsผู้แต่ง: Sriariyanun, M, Mutrakulcharoen, P, Tepaamorndech, S, Cheenkachorn, K,  Dr.Kittipong Rattanaporn, Assistant Professor , วารสาร: 
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Determination of Selenium in Water Samples by Using a Methylene Blue Kinetic Catalytic Spectrophotometric Method) ผู้เขียน:ดร.อภิสิฏฐ์ ศงสะเสน, รองศาสตราจารย์ , ภาษิต อัครยรรยง, Sornarin Bangkedphol, Wantana Sasomsap สื่อสิ่งพิมพ์:pdf AbstractA kinetic catalytic spectrophotometric method, which was very sensitive and effective, was developed for the determination of selenium in water samples. It based on the catalytic effect of selenium on the reaction of methylene blue with sodium sulfide. A change in the absorbance of methylene blue with times at various concentrations of selenium were monitored, giving the “end point” (time) for each concentration of selenium. A plot of end point versus selenium concentration constituted a calibration graph, which was linear in a range of 2.5-30 ppb of selenium, with the correlation coefficient of 0.9992. The method was applied to determine the amount of selenium in the water sample containing 15 ppb of selenium, giving 91.84% recovery and the relative standard deviation of 2.27%. Compared with the hydride generation atomic absorption spectrometry method, this method is more sensitive for the determination of selenium in the water sample when the concentration of selenium is lower than 100 ppb. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Complexation and Spectrophotometric Determination of Cobalt(II) Ion with 3-(2?-thiazolylazo)-2,6-diaminopyridine) ผู้เขียน:Natthapon VEERACHALEE, Pongpol Taweema, ดร.อภิสิฏฐ์ ศงสะเสน, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe complexation of 3-(2?-thiazolylazo)-2,6-diaminopyridine (TADAP) with cobalt(II) has been studied spectrophotometrically. The stability constant of TADAP ligand with cobalt(II) ion has been determined at a constant temperature, where the molar ratio of this complex is 1:2 (metal:ligand). TADAP has been prepared and characterized on the basis of FT-IR spectral data. A procedure for the spectrophotometric determination of this complex is proposed where it is rapid, sensitive and highly specific. Beer’s law was obeyed in the range 2.0 ? 10-6-1.2 ? 10-5 M at pH 10 to form a green complex. The limit of detection is 5.26 ? 10-7 M (? = 1.52 ? 104 l-1mol-1cm-1 at ?max = 598 nm). |
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