Determination of iron content by ultraviolet-visible spectrophotometer with phenanthroline method - Master's thesis

Determination of iron content by ultraviolet-visible spectrophotometer with phenanthroline method

Key words: UV-visible spectrophotometer, phenanthroline method; iron content; analysis instrument ; I. Experimental purpose: to understand the application of Lambert-Beer law, master the principle of determination of iron by the adjacent phenanthroline method Understand the construction of the spectrophotometer; master the correct use of the spectrophotometer; learn the drawing of the absorption curve and the principle of the sample. Second, the experimental principle of phenanthroline is a better reagent for the determination of trace iron. Under the condition of pH=2ï½ž9, phenanthroline and Fe ^{2+ form} a stable orange-red complex with the following reaction formula:

$</p> Fe<sup>3+</sup> can form a light blue complex with the phenanthroline (unstable), so add a reducing agent before the coloration: hydroxylamine hydrochloride to reduce it to Fe<sup >2+</sup>. <sup>. </sup>3. Instruments and reagents UV-visible spectrophotometer, iron standard solution: iron 0.01mg/mL, 0.1% phenanthroline aqueous solution, 10% hydroxylamine hydrochloride aqueous solution, 1mol/l NaAc buffer solution (pH4.6) . American Instrument ; V-1100; V-1200 IV. Experimental Step 1. Draw the absorption curve and select the measurement wavelength. Pipette 0.0mL and 6.0mL iron standard solution into two 50mL volumetric flasks, add 5ml NaAc solution, 2.5ml hydroxylamine hydrochloride solution, 5ml phenanthroline solution, dilute with distilled water until Scale and shake. The absorbance was measured every 0.5 nm using a 1 cm cuvette with a reagent blank as a reference and between 440 and 560 nm. Then, with the wavelength as the abscissa and the absorbance A as the ordinate, the absorption curve is drawn to find the maximum absorption wavelength. 2. Drawing of the standard curve, respectively, extract the standard solution of iron 0.0, 2.0, 4.0, 6.0, 8.0, 10.0 ml into 6 50 ml volumetric flasks, and then add 5 ml of acetic acid-sodium acetate buffer solution, 2.5 ml of hydroxylamine hydrochloride solution, 5 ml respectively. The phenanthroline solution was diluted to the mark with distilled water, shaken and left for 10 minutes. At its maximum absorption wavelength, the absorbance of each solution was determined by using a 1 cm cuvette and the reagent solution as a blank. The iron content (mg/ 50 ml) is the abscissa, and the corresponding absorbance of the solution is the ordinate, and a standard curve is drawn. V. Experimental Record and Data Processing <table border="1" cellspacing="0" cellpadding="0"> <tbody> Wavelength/nm Absorbance</tbody></table><table border="1" cellspacing=" 0" cellpadding="0" width="85%"> <tbody> Standard solution (0.01g/L) Unknown fluid Volumetric flask number 1 2 3 4 5 6 7 Volume taken 0 2.0 4.0 6.0 8.0 10.0 Absorbance A </tbody></table> draws a graph. Key words: UV-visible spectrophotometer, phenanthroline method; iron content; analysis instrument ;</p></dl> </div> <div class="tech-detail-share" >  <div class="bdsharebuttonbox"> <a href="#" class="bds_qzone" data-cmd="qzone" title="Share to QQ Space"></a > <a href="#" class="bds_tsina" data-cmd="tsina" title="Share to Sina Weibo"></a> <a href="#" class="bds_weixin" data-cmd= "weixin" title="Share to WeChat"></a> <span>Share to:</span> </div> <script>window._bd_share_config = { "common": { "bdSnsKey": {}, " bdText": "", "bdMini": "1", "bdMiniList": false, "bdPic": "", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName($

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