離子交換電霧檢測測定CO2吸收液中一乙醇胺、二乙醇胺、N-甲基二乙醇胺

漸江大學(xué)學(xué)報(理學(xué)版第38卷第4期Journal of Zhejiang University( Science Edition)Vol 38 No 42011年7http://www.journalszju.edu.cn/sciJul. 2011DOI:10.3785/.issn.10089497.2011.04.015離子交換電霧檢測測定CO2吸收液中乙醇胺、二乙醇胺、N-甲基二乙醇胺葉明立12,陳郁3(1.淅江大學(xué)化學(xué)系,浙江杭州310028;2.戴安中國有限公司上海實(shí)驗室,上海201203;3.杭州職業(yè)技術(shù)學(xué)院,浙江杭州310018)犢要:建立了陽(yáng)離子交換-電霧檢測器測定CO吸收液中一乙醇胺、二乙醇胺、N甲基二乙酶胺的分析方瀆,實(shí)驗禾Ion Pac CS17陽(yáng)離子交換柱,選用甲酸與乙腈溶液為淋洗液,并考察了色譜柱種類(lèi)、淋洗液種類(lèi)與濃度對分離測定有機醇胺的彩響.所測3種有機醇胺的檢出限分別為0.21、0.04、0.32gg·mL1,線(xiàn)性范圍在1.0~100gg·mL-,相關(guān)系數分別為0.996、0.9993和0.9992,加標回收奉為87%~98%.用所建立的方法測定了CO2吸收液中有機胺質(zhì)量濃度,結果令人滿(mǎn)意關(guān)鍵詞:陽(yáng)離子交換;電霧檢測器;有機醇胺中圖分類(lèi)號:O657.7文獻標志碼:A文章編號:1008-9497(2011)04433-03YE Ming-li.2, CHEN Yu(1. Department of Chemistry, Zhejiang University, Hangzhou 310028, Chinas2. Shanghai Lab, Dionex China Co LTD, Shanghai 201203, China: 3. Hangzhou Vocational and TechnicalCollege, Hangzhou 310018, China)Determination of monoethanolamine, diethanolamine and diethanolmethylamine in the absorption liquid of co, by ionhromatography with charged aerosol detector Journal of Zhejiang University( Science Edition), 2011, 38(4): 433-435Abstract: A method was developed for the determination of monoethanolamine, diethanolamine and Diethanolmethylamine in the absorption liquid of CO, by cation-exchange ion chromatography with charged aerosol detector(CAD). Chromatographic separation was performed on a Dionex lon Pac CS17(250X 4 mm), fomic acid and aceton-trile were used as eluent, respectively. The effects of the types of column, eluent, eluent concentration of organic alcoholamines were investigated. The linear ranges of the method for three alcohol amines were 1. 0-100 ug.mL , thecorrelation coefficients were 0. 9996, 0. 9993 and 0. 9992, and the detection limits(S/N=3)were 0. 21, 0.040. 32 ug. I respectively. The method was successfully applied to determine organic alcohol amines in real sam-ple. The recoveries of three organic alcohol amines after spiking were from 87% to 98%Key Words: cation-exchange; charged aerosol detector; organic alcohol amine要為一乙醇胺(MEA)、二乙醇胺(DEA)、N甲基二乙0引言醇胺(MDEA))為吸收劑的CO2吸收法廣泛應用于天然氣、煉廠(chǎng)氣、合成氣及煙氣等各種氣體凈化工藝CO2是主要的溫室氣體之一,減少CO2排放量中-2,在醇胺類(lèi)CO2吸收劑研究與生產(chǎn)過(guò)程中對的有效途徑就是從各種排放氣體中分離回收CO2,有機胺成分及質(zhì)量濃度測定有著(zhù)重要的意義用于生產(chǎn)尿素、純堿等化工產(chǎn)品.因此,從各種排放有機胺類(lèi)化合物,主要采用氣質(zhì)聯(lián)用GC氣體中分離提純CO2并加以利用,不僅具有重要的Ms,反相液相色譜HPLC5等方法分析,但由于環(huán)境效益,而且具有經(jīng)濟效益,以有機胺水溶液(主醇胺類(lèi)化合物熱不穩定,易分解,采用GCMS分析收稿日期:2011-03-20基金項目:淅江省自然科學(xué)基金資助項目(Y2110945R4080124Y507252);浙江省分析測作者簡(jiǎn)介:葉明立(1978-),男,碩士,主要從事分析測試方法的研究通信作者E-mail:chenyu0571@163.comTH中國煤化工CNMHG434浙江大學(xué)學(xué)報(理學(xué)版)第38卷不是太適合;而在反相液相色譜柱上,醇胺類(lèi)保留很2.2乙腈體積分數對分離的影響弱,需要進(jìn)行復雜的衍生才能進(jìn)行測定有機胺具有一定的疏水性,加入有機溶劑可減電霧檢測器(CAD)是新型通用型檢測器-81,少有機胺與固定相疏水表面的吸附作用,改善峰形色譜淋洗液及被分析物經(jīng)霧化器霧化,其中分析物與分離度.在流速恒定情況下,通過(guò)5%、10%液滴在室溫下干燥形成溶質(zhì)顆粒,與帶正電荷的氮15%20%和30%等不同體積分數乙腈作對比實(shí)氣顆粒反向相遇,經(jīng)碰撞使溶質(zhì)顆粒帶上正電,用檢驗發(fā)現適度增加乙腈的體積分數,可以改善峰型,測器測出帶電溶質(zhì)的信號電流由此產(chǎn)生的信號電提高塔板數但對3種有機胺出峰時(shí)間影響不大在流與溶質(zhì)的質(zhì)量濃度呈正比CAD可實(shí)際應用于任流動(dòng)相中加入體積分數為10%乙腈較適宜何非揮發(fā)或半揮發(fā)化合物的分析檢測2.3甲酸體積分數對分離的影響本方法根據MEA、DEA、MDEA的理化性質(zhì),陽(yáng)離子交換分離機理中,淋洗液離子體積分數越采用陽(yáng)離子交換色譜柱-10分離、CAD電霧檢測器高淋洗液從固定相置換溶質(zhì)離子越有效,溶質(zhì)離子測定CO2吸收液中醇胺類(lèi)化合物,結果令人滿(mǎn)意.的洗脫時(shí)間越短.在流速、乙腈體積分數恒定情況下改變甲酸體積分數0.02%、0.05%、0.1%、0.2%1材料與方法0.3%作對比試驗.甲酸體積分數在0.1%時(shí),3種有機胺達到完全分離,且出峰時(shí)間比較適宜1.1儀器與試劑2.4線(xiàn)性關(guān)系、線(xiàn)性范圍及檢出限Dionex ics5000色譜儀(美國戴安公司),配用標準品配制7種不同質(zhì)量濃度的混合標準溶PEE泵, Chromeleon色譜工作站; CORONA UL液MEA、DEA與MDEA質(zhì)量濃度分別為1.0、TRA電霧檢測器;AS自動(dòng)進(jìn)樣器2.0、5.0、10.0、20.0、50.0、100g·mL1,對上述乙醇胺(MEA)、二乙醇胺(DEA)、N甲基二溶液各測定3次后,取其峰面積的平均值,以峰面乙醇胺(MDEA),均為分析純試劑,購自上海醫藥積為縱坐標,標準液質(zhì)量濃度為橫坐標建立標準工集團有限公司,實(shí)驗用水為超純水作曲線(xiàn),3種物質(zhì)的線(xiàn)性回歸方程如表1所示.可以1.2色譜條件看出,3種物質(zhì)在1.0~100g·mL時(shí)峰面積與質(zhì)量采用 Ion Pac CG17(50mm×0.4mm)保護柱和濃度呈線(xiàn)性響應,相關(guān)系數為0.9992~0.9996.以信Ion Pac CS17(250mm×0.4mm)分離柱.流動(dòng)相為噪比(S/N)為3計算檢出限,MEA、DEA、MDEA的V(乙腈):v(甲酸)=10:90等度淋洗流速為檢出限分別為0.21、0.04、0.32g·mL1.4mL·min';進(jìn)樣體積5μL,柱溫30℃.表1方法的線(xiàn)性關(guān)系電霧檢測器參數:氮氣壓力24kPa;霧化溫度Table 1 Aggression equation of the analyte determined25℃;檢測范圍設置為100pA被測物回歸方程線(xiàn)性范圍2結果與討論Analyte regression equation相關(guān)系數r(g·mL-)Lanear rangeMEAY=0.0268X-0.00020.99961.0~1002.1色譜柱的選擇MEA、DEA、MDEA在酸性情況下均以陽(yáng)離子DEAY=0.09910.9993的形式存在,但也表現一定的疏水性.因此采用陽(yáng)離X-0.00081.0~100子交換機理與反相機理相結合的混合基質(zhì)色譜柱對Y=0.0311MDEA0.99921.0~1其進(jìn)行分離X+0.0013選擇 Acclaim WCX1柱、 Acclaim Trinity PlEE Y, peak area; X: mass concentration of analyte, Hg.mL柱和 Ion Pac CS17柱作為分離柱進(jìn)行實(shí)驗. Acclaim2.5重現性WCX-1柱流失比較嚴重,CAD檢測器背景噪音達吸取 MEA DEA MDEA質(zhì)量濃度為50g·mL1到50pA,不適合用于該方法 Acclaim Trinity P1的混合標準溶液,重復進(jìn)樣11次,記錄色譜圖(見(jiàn)圖柱,CAD檢測器背景噪音<5pA,但調整流動(dòng)相仍1).它們保留時(shí)間的相對標準偏差分別為0.04%、無(wú)法使3種有機胺達到基線(xiàn)分離. Ion Pac CS17柱0.03%、0.08%對3種有機胺保留合適,且背景噪音<5pA.因此,1.21%、0.81%中國煤化工差分別為選擇 Ion Pac CS17柱作為分離柱為1.60%、0.61%、YHECNMHGE偏差分別雖塊第4期葉明立,等:離子交換電霧檢測測定CO2吸收液中一乙醇胺、二乙醇胺、N甲基二乙醇胺4351003結論g50本方法采用陽(yáng)離子色譜法-電霧檢測器測定0.0CO2吸收液中的有機胺,進(jìn)一步優(yōu)化了分離條件,在等淋洗條件下分離一乙醇胺、二乙醇胺、N甲基0.010203.040506.07.0809010.0二乙醇胺.在此色譜條件下,一乙醇胺、二乙醇胺、圖1標準溶液的色譜圖N-甲基二乙醇胺有較好的線(xiàn)性和重現性以及較為Fig. 1 Chromatogram of standard solution理想的檢測下限,也解決了部分有機胺電導響應靈l:MEA(50g·mL1),2:DEA(5g·mL-1),3:MDEA敏度不高等問(wèn)題,可以應用于CO2吸收液實(shí)際樣品的測定2.6樣品測定及回收率樣品稀釋100倍,經(jīng)過(guò)0.22pm濾膜過(guò)濾后,參考文獻( References)按“1.2”節色譜條件進(jìn)行測定,外標法定量,其分析結果見(jiàn)表2為確保檢驗方法的準確性,在原樣品中[1] LIN Po-hsun, KO Chih-chiang, LI Meng-hui. 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