UOP 818-1981 THIOSULFATE IN LEAN AMINE SOLUTIONS.pdf
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1、THIOSULFATE IN LEAN AMINE SOLUTIONSUOP Method 818-81SCOPEThis method is for determining thiosulfate in lean amine solutions. Thiosulfate is calculated and reportedas either apparent H2S in grains/gal or as sodium thiosulfate in g/100 mL. The lower limit of detection isapproximately 25 grains/gal.OUT
2、LINE OF METHODThe amine sample is diluted with water, boiled to eliminate hydrogen sulfide and acidified. Thethiosulfate in the acidified solution is treated with an excess of standard iodine solution. The excess iodineis back-titrated to the starch indicator endpoint with standard sodium thiosulfat
3、e solution.APPARATUSBalance, torsion or top loading type, capacity 500 g, capable of weighing to 0.01 gBeaker, 100- and 250-mLBoiling chipsBuret, 50-mLCylinder, graduated, 25- and 250-mLFlask, Erlenmeyer, 250-mLFlask, volumetric, one-liter (2 required)Flask, volumetric, 100-mLHot platePipets, volume
4、tric, 1-, 5- and 10-mLStirrer, magnetic, with Teflon-covered stirring barStirring rod, glass, 150-mm lengthIT IS THE USERS RESPONSIBILITY TO ESTABLISH APPROPRIATE PRECAUTIONARY PRACTICES AND TODETERMINE THE APPLICABILITY OF REGULATORY LIMITATIONS PRIOR TO USE. EFFECTIVE HEALTH ANDSAFETY PRACTICES AR
5、E TO BE FOLLOWED WHEN UTILIZING THIS PROCEDURE. FAILURE TO UTILIZE THISPROCEDURE IN THE MANNER PRESCRIBED HEREIN CAN BE HAZARDOUS. MATERIAL SAFETY DATA SHEETS(MSDS) OR EXPERIMENTAL MATERIAL SAFETY DATA SHEETS (EMSDS) FOR ALL OF THE MATERIALS USED INTHIS PROCEDURE SHOULD BE REVIEWED FOR SELECTION OF
6、THE APPROPRIATE PERSONAL PROTECTIONEQUIPMENT (PPE). COPYRIGHT 1981 UOP LLCALL RIGHTS RESERVEDUOP Methods are available through ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken PA 19428-2959,United States. The Methods may be obtained through the ASTM website, www.astm.org, or
7、 by contacting Customer Service atserviceastm.org, 610.832.9555 FAX, or 610.832.9585 PHONE.2 of 3818-81REAGENTS AND MATERIALSUnless otherwise indicated, all reagents shall conform to the specifications of the Committee onAnalytical Reagents of the American Chemical Society, where such specifications
8、 exist. References towater, unless otherwise indicated, mean distilled or deionized water.Hydrochloric acid, concentratedIodine solution, 0.05-M. To prepare, dissolve 25 g of potassium iodide in 200 mL of water. Warm slightlyto dissolve. Cool and add 12.69 g iodine crystals. Stir the solution to dis
9、solve the reagents and transferquantitatively to a one-liter volumetric flask. Dilute to volume with water. Store in an amber bottle.Standardize against the 0.1-M sodium thiosulfate. If samples are analyzed infrequently, the iodinesolution must be standardized prior to use.Lead acetate paperMethyl o
10、range indicator solution, 0.1 wt-% concentration. Dissolve 0.1 g of methyl orange in 100 mL ofwater.Salicylic acidSodium thiosulfate solution, 0.1-M. To prepare, dissolve 24.82 g of sodium thiosulfate (Na2S2O3 5H2O)in 200 mL of warm water. Quantitatively transfer to a one-liter volumetric flask, coo
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