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共創健康安全的生(sheng)活環境18151076640
采用Markes Airsever在線(xian)取樣熱脫附(fu)儀(yi),以賽默飛Trace 1310氣(qi)相色譜配(pei)置(zhi)雙FID檢(jian)測(ce)器和(he)中心切割(ge)組件,建立了針對環(huan)(huan)境空氣(qi)56種臭(chou)氧(yang)前(qian)體(ti)物的分析測(ce)定(ding)方法(fa),可(ke)滿足對環(huan)(huan)境臭(chou)氧(yang)前(qian)體(ti)物的連續在線(xian)監測(ce)分析。
臭氧(yang)前(qian)(qian)體(ti)物(wu)(wu)(wu)是(shi)指沸點(dian)在(zai)(zai)50-260℃之間,室溫下飽(bao)和蒸氣壓超過(guo)133.322Pa,含碳數在(zai)(zai) C2-C12的(de)一(yi)類參加大氣光(guang)(guang)化(hua)學(xue)反應的(de)揮(hui)發性(xing)(xing)有(you)(you)機物(wu)(wu)(wu) (Volatile Organic Compounds, VOCs)。隨著工業發展,汽(qi)車數目的(de)增(zeng)多,以(yi)及其(qi)他燃燒(shao)過(guo)程(cheng)中(zhong)使用石油(you)的(de)不(bu)斷增(zeng)長,光(guang)(guang)化(hua)學(xue)氧(yang)化(hua)型大氣污(wu)(wu)(wu)染已(yi)成為城(cheng)市空(kong)氣污(wu)(wu)(wu)染的(de)一(yi)個嚴重問題。在(zai)(zai)1990年(nian)美國(guo)(guo)環(huan)保署(EPA)修正的(de)清(qing)潔空(kong)氣法里,加入了空(kong)氣中(zhong)對(dui)臭氧(yang)生(sheng)成有(you)(you)貢獻的(de)揮(hui)發性(xing)(xing)有(you)(you)機物(wu)(wu)(wu)(VOC)的(de)監測。幾年(nian)來,在(zai)(zai)我國(guo)(guo)中(zhong)、南(nan)部(bu)特別(bie)是(shi)沿海城(cheng)市均已(yi)發生(sheng)或(huo)面臨光(guang)(guang)化(hua)學(xue)煙霧(wu)(wu)威脅,北京、廣州(zhou)、上海、鞍山、武漢、蘭州(zhou)等城(cheng)市均出(chu)現了不(bu)同程(cheng)度的(de)光(guang)(guang)化(hua)學(xue)煙霧(wu)(wu)污(wu)(wu)(wu)染。相比與國(guo)(guo)外的(de)空(kong)氣質量標準來看,我國(guo)(guo)光(guang)(guang)化(hua)學(xue)煙霧(wu)(wu)污(wu)(wu)(wu)染的(de)程(cheng)度已(yi)經到了不(bu)容忽視的(de)程(cheng)度,其(qi)中(zhong)揮(hui)發性(xing)(xing)有(you)(you)機物(wu)(wu)(wu)是(shi)光(guang)(guang)化(hua)學(xue)煙霧(wu)(wu)的(de)主要前(qian)(qian)體(ti)物(wu)(wu)(wu),因此(ci)對(dui)其(qi)實施評估(gu)檢測顯得尤為必要。
目前(qian)針對環境(jing)(jing)空氣(qi)(qi)的(de)檢(jian)測法(fa)規有很多,如(ru)美國(guo)(guo)EPA方法(fa)TO-1、TO-14、TO-15 和TO-17,美國(guo)(guo)ASTM方法(fa)D5466,ISO-16017以及中(zhong)(zhong)國(guo)(guo)環境(jing)(jing)標(biao)準HJ644-2013等(deng)。其(qi)中(zhong)(zhong)針對臭氧前(qian)體物(wu)的(de)分析,從取樣到分析的(de)整個階段,更為大家所接受的(de)還是美國(guo)(guo)EPA的(de)罐(guan)采(cai)樣、氣(qi)(qi)相色譜配置雙(shuang)FID檢(jian)測器(qi)、采(cai)用中(zhong)(zhong)心切割(ge)技(ji)術進(jin)行分析的(de)方法(fa)[1]。本文參考該方法(fa),采(cai)用Markes Airsever 在線取樣熱脫附儀,以賽(sai)默飛Trace 1310氣(qi)(qi)相色譜配置雙(shuang)FID檢(jian)測器(qi)和中(zhong)(zhong)心切割(ge)組件,對環境(jing)(jing)空氣(qi)(qi)中(zhong)(zhong)的(de)臭氧前(qian)體物(wu)進(jin)行了分離測定(ding)。
實驗材料
儀器與標氣
儀器:Trace 1300 GC氣相色譜儀配置(zhi)雙FID檢測器(Thermo Fisher Scientific);Deans Switch套件(P/N: 19005580,Thermo Scientific);TG-1MS色譜柱(60 m×0.25 mm×1.0 μm)(P/N: 26099-3080, Thermo Fisher scientific);TG-BOND Na2SO4色譜柱(50 m×0.32 mm×5.0 μm)(P/N: 26001-6050, Thermo Fisher scientific);UNITY 2 Air Server(Markes international)。
標氣:56種臭氧前(qian)體(ti)物混合標氣(濃度1.0ppm,購于美國(guo)公司(si))
標氣(qi)(qi)的(de)配(pei)制:采用ENTECH 4600A氣(qi)(qi)體稀(xi)釋儀將標氣(qi)(qi)稀(xi)釋成濃度為(wei)10.0ppb的(de)標準混合氣(qi)(qi),底氣(qi)(qi)為(wei)高純氮(dan)氣(qi)(qi)。
環境空氣采樣
采用(yong)Markes Airsever 在(zai)線取(qu)樣熱(re)脫附儀,固(gu)定取(qu)樣流速為25.0ml/min,每隔1.5小時取(qu)樣600.0ml進行分析。
儀器條件
Air-sever條件:取(qu)樣(yang)前(qian),預(yu)吹(chui)掃1min;取(qu)樣(yang)流速25.0ml/min,取(qu)樣(yang)時(shi)間(jian)(分別取(qu)樣(yang)4min、8min、16min、24min、32min、40min,用(yong)(yong)于繪制標曲;取(qu)樣(yang)16min用(yong)(yong)于測定環(huan)境空(kong)氣(qi)樣(yang)品);冷阱(jing)(Ozone Precursor/Freons,型號:U-T5O3F-2S);取(qu)樣(yang)時(shi)冷阱(jing)溫度(du)-30℃;取(qu)樣(yang)后(hou)吹(chui)掃1min,流量50ml/min;脫附(fu)前(qian)吹(chui)掃1min,流量25ml/min;采用(yong)(yong)zui大升(sheng)溫速率,升(sheng)至(zhi)325℃進行脫附(fu),脫附(fu)時(shi)間(jian)5min,分流,分流比1:20;傳輸線溫度(du)150℃。
色譜條件:柱溫(wen):40℃(15 min),5℃/min到(dao)170℃(0min),15℃/min到(dao)200℃(7min);載氣(qi)(qi)(qi)(qi)(qi):高純氮(99.999%),恒壓模式,33.43psi;輔(fu)助(zhu)(zhu)氣(qi)(qi)(qi)(qi)(qi)1和輔(fu)助(zhu)(zhu)氣(qi)(qi)(qi)(qi)(qi)2均(jun)為(wei)13.90psi,輔(fu)助(zhu)(zhu)氣(qi)(qi)(qi)(qi)(qi)程(cheng)序設置(0min,打(da)開(kai)輔(fu)助(zhu)(zhu)氣(qi)(qi)(qi)(qi)(qi)2、關閉(bi)(bi)輔(fu)助(zhu)(zhu)氣(qi)(qi)(qi)(qi)(qi)1,14.0min打(da)開(kai)輔(fu)助(zhu)(zhu)氣(qi)(qi)(qi)(qi)(qi)2、關閉(bi)(bi)輔(fu)助(zhu)(zhu)氣(qi)(qi)(qi)(qi)(qi)1)。FID檢測器:溫(wen)度250℃,空氣(qi)(qi)(qi)(qi)(qi)350 mL/min,氫氣(qi)(qi)(qi)(qi)(qi)35 mL/min,尾吹氣(qi)(qi)(qi)(qi)(qi)(氮氣(qi)(qi)(qi)(qi)(qi))40 mL/min。
結果與討論
標準氣體色譜圖
圖1 為(wei)10ppb的(de)(de)(de)(de)56種臭氧(yang)前(qian)體(ti)(ti)(ti)物(wu)混(hun)合標(biao)(biao)氣取(qu)樣400.0ml,不經切割,直接由二甲(jia)基聚硅氧(yang)烷(wan)(wan)柱(zhu)(zhu)經阻尼柱(zhu)(zhu)到達(da)FID1,可(ke)以看出部分(fen)低沸點(dian)(dian)組份的(de)(de)(de)(de)目標(biao)(biao)化(hua)合物(wu)(特別是(shi)乙(yi)烷(wan)(wan)、乙(yi)烯、乙(yi)炔等(deng))沒有(you)達(da)到較好(hao)的(de)(de)(de)(de)分(fen)離。若想達(da)到對(dui)(dui)低沸點(dian)(dian)組份的(de)(de)(de)(de)分(fen)離,可(ke)采用對(dui)(dui)其有(you)強保留性能的(de)(de)(de)(de)氧(yang)化(hua)鋁PLOT柱(zhu)(zhu),這類色(se)譜柱(zhu)(zhu)對(dui)(dui)于(yu)輕質(zhi)氣體(ti)(ti)(ti)的(de)(de)(de)(de)分(fen)離效果是(shi)非常理想的(de)(de)(de)(de)。但(dan)是(shi),氧(yang)化(hua)鋁PLOT柱(zhu)(zhu)在使用溫度上(shang)有(you)限制,其不適(shi)于(yu)對(dui)(dui)高沸點(dian)(dian)組份的(de)(de)(de)(de)分(fen)離。本文,我們參考美國EPA的(de)(de)(de)(de)臭氧(yang)前(qian)體(ti)(ti)(ti)物(wu)分(fen)析標(biao)(biao)準(zhun),將(jiang)二甲(jia)基聚硅氧(yang)烷(wan)(wan)柱(zhu)(zhu)與氧(yang)化(hua)鋁PLOT柱(zhu)(zhu)通過中(zhong)心(xin)切割組件連接(如圖2所(suo)示)。
圖1. 10-ppb 56種臭氧前體物(wu)混合標氣流經(jing)硅氧烷柱到達FID1
圖2.TG-1MS與TG-PLOT色譜(pu)柱在(zai)氣相爐溫箱內的連接(jie)方式
該中心切割組件采用(yong)具有高惰性及低熱質量的(de)(de)微流平(ping)板設計,具有死(si)體(ti)積(ji)小(xiao)(xiao)的(de)(de)優勢(shi),會減小(xiao)(xiao)峰展寬(kuan)效(xiao)應。圖3為采用(yong)Thermo中心切割技術,將56種(zhong)臭(chou)氧(yang)前(qian)體(ti)物混合物分為兩部分,分別引入到(dao)(dao)兩個色(se)譜柱上,其中正己烷(wan)之(zhi)前(qian)的(de)(de)組份經二甲(jia)基(ji)聚硅氧(yang)烷(wan)柱后(hou)直接進(jin)入氧(yang)化(hua)鋁PLOT柱進(jin)行分離,經FID2檢(jian)測;正己烷(wan)之(zhi)后(hou)的(de)(de)組份經二甲(jia)基(ji)硅氧(yang)烷(wan)柱到(dao)(dao)阻尼柱,經FID1檢(jian)測。可以(yi)明顯看(kan)出,56種(zhong)臭(chou)氧(yang)前(qian)體(ti)物在上述兩根色(se)譜柱上達到(dao)(dao)了(le)較好(hao)的(de)(de)分離,為后(hou)續的(de)(de)定量分析檢(jian)測提供了(le)基(ji)礎(chu)。
圖(tu)3. 56種臭(chou)氧前體物在TG-1MS和TG-PLOT柱子上的平(ping)行(xing)分離色譜圖(tu)
3.2 工作曲線與保留時間及峰面積精密度
為了進一步評價該套系統對臭氧前體物分析的可靠性,我們對10.0ppb的56種臭氧前體物標氣,進行了不同取樣體積的分析(取樣體積100ml、200ml、400ml、600ml、800ml和1000ml)。實驗發現,取樣體積從100ml到1000ml,6個濃度點的范圍, 除乙炔外,各物質的線性相關系數均大于0.995(見表1和表2)。同時對10.0ppb標氣、取樣體積400.0ml,連續取樣分析6次,在TG-1MS柱上各物質保留時間及峰面積的重復性分別小于0.02%和2.14%(見表3);在TG-PLOT柱上各物質保留時間及峰面積的重復性分別小于0.39%和2.63%(見表4),上述結(jie)果(guo)同時也表(biao)明了該系統對(dui)臭氧前體物分析的高精密度特性。
表1. 從TG-1色譜柱流出的各物質的線性相關性
保留時間/min | 峰名稱 | 取樣體積 | 線性系數 | 線性方程 | |
14.502 | n-Hexane | 100-1000ml | 0.9983 | y=0.0082x-0.4932 | |
16.977 | Methylcyclopentane | 100-1000ml | 0.9970 | y=0.0069x-0.5087 | |
17.235 | 2,4-Dimethylpentane | 100-1000ml | 0.9992 | y=0.0101x-0.4477 | |
19.033 | Benzene | 100-1000ml | 0.9988 | y=0.0079x-0.4653 | |
19.843 | Cyclohexane | 100-1000ml | 0.9974 | y=0.0075x-0.4588 | |
20.453 | 2-Methylhexane | 100-1000ml | 0.9988 | y=0.0095x-0.4271 | |
20.632 | 2,3-Dimethylpentane | 100-1000ml | 0.9985 | y=0.0101x-0.5091 | |
21.173 | 3-Methylhexane | 100-1000ml | 0.9988 | y=0.0098x-0.4442 | |
22.292 | 2,2,4-Trimethylpentane | 100-1000ml | 0.9989 | y=0.0110x-0.4612 | |
23.082 | n-Heptane | 100-1000ml | 0.9990 | y=0.0097x-0.3497 | |
24.792 | Methylcyclohexane | 100-1000ml | 0.9988 | y=0.0099x-0.5482 | |
26.853 | 2,3,4-Trimethylpentane | 100-1000ml | 0.9989 | y=0.0111x-0.4522 | |
27.19 | Toluene | 100-1000ml | 0.9993 | y=0.0097x-0.3247 | |
27.862 | 2-Methylheptane | 100-1000ml | 0.9993 | y=0.0113x-0.2843 | |
28.372 | 3-Methylheptane | 100-1000ml | 0.9993 | y=0.0113x-0.3102 | |
30.007 | n-Octane | 100-1000ml | 0.9995 | y=0.0113x-0.2182 | |
33.092 | Ethylbenzene | 100-1000ml | 0.9994 | y=0.0114x-0.2534 | |
33.602 | p/m-Xylene | 100-1000ml | 0.9997 | y=0.0228x-0.2859 | |
34.538 | Styrene | 100-1000ml | 0.9992 | y=0.0095x-0.1382 | |
34.828 | o-Xylene | 100-1000ml | 0.9997 | y=0.0113x-0.1793 | |
35.55 | Nonane | 100-1000ml | 0.9998 | y=0.0138x-0.1005 | |
36.478 | isopropybenzene | 100-1000ml | 0.9996 | y=0.0124x-0.2444 | |
37.928 | n-Propylbenzene | 100-1000ml | 0.9997 | y=0.0122x-0.1222 | |
38.238 | m-Ethyltoluene | 100-1000ml | 0.9997 | y=0.0125x-0.0970 | |
38.357 | p-Ethyltoluene | 100-1000ml | 0.9997 | y=0.0125x-0.0465 | |
38.585 | 1,3,5-Trimethylbenzene | 100-1000ml | 0.9997 | y=0.0122x-0.0758 | |
39.137 | o-Ethyltoluene | 100-1000ml | 0.9998 | y=0.0119x-0.1018 | |
39.8 | 1,2,4-Trimethylbenzene | 100-1000ml | 0.9996 | y=0.0119x-0.0253 | |
40.203 | n-Decane | 100-1000ml | 0.9996 | y=0.0148x+0.0584 | |
41.113 | 1,2,3-Trimethylbenzene | 100-1000ml | 0.9997 | y=0.0115x-0.0399 | |
42.043 | m-Diethylbenzene | 100-1000ml | 0.9997 | y=0.0131x-0.0214 | |
42.305 | p-Diethylbenzene | 100-1000ml | 0.9996 | y=0.0129x+0.0465 | |
43.933 | n-Undecane | 100-1000ml | 0.9983 | y=0.0151x+0.3028 | |
47.468 | n-Dodecane | 100-1000ml | 0.9986 | y=0.0089x+0.6567 |
表2. 從TG-PLOT色譜柱流出的各物質的線(xian)性相關(guan)性
保留時間/min | 峰名稱 | 取樣體積 | 相關系數 | 線性方程 | |
9.57 | Ethylene | 100-1000ml | 0.9961 | y=0.0021x+0.1692 | |
11.505 | Acetylene | 100-1000ml | 0.9142 | y=0.0010x+0.3231 | |
15.352 | Ethane | 100-1000ml | 0.9996 | y=0.0046x-0.0825 | |
23.96 | Propylene | 100-1000ml | 0.9997 | y=0.0040x-0.0772 | |
26.062 | Propane | 100-1000ml | 0.9998 | y=0.0063x-0.3551 | |
27.192 | Isobutane | 100-1000ml | 0.9983 | y=0.0063x-0.5022 | |
27.938 | 1-Butene | 100-1000ml | 0.9975 | y=0.0002x+0.3186 | |
32.602 | n-Butane | 100-1000ml | 0.9995 | y=0.0058x-0.4639 | |
33.105 | Trans-2-Butene | 100-1000ml | 0.9979 | y=0.0059x-0.3671 | |
34.477 | Cis-2-Butene | 100-1000ml | 0.9982 | y=0.0061x-0.4639 | |
35.333 | Isopentane | 100-1000ml | 0.9963 | y=0.0074x-0.6304 | |
35.667 | 1-Pentene | 100-1000ml | 0.9971 | y=0.0071x-0.3504 | |
36.548 | n-Pentane | 100-1000ml | 0.9959 | y=0.0075x-0.4590 | |
39.86 | Isoprene | 100-1000ml | 0.9958 | y=0.0075x-0.4871 | |
40.858 | Trans-2-Pentene | 100-1000ml | 0.9958 | y=0.0071x-0.4680 | |
41.425 | Cis-2-Pentene | 100-1000ml | 0.9989 | y=0.0072x-0.4778 | |
42.34 | 2,2-Dimethylbutane | 100-1000ml | 0.9980 | y=0.0092x-0.5053 | |
42.9 | Cyclopentane | 100-1000ml | 0.9996 | y=0.0102x-0.6407 | |
43.048 | 2,3-Dimethylbutane | 100-1000ml | 0.9972 | y=0.0098x-0.4481 | |
43.142 | 2-Methylpentane | 100-1000ml | 0.9973 | y=0.0096x-0.3888 | |
44.172 | 3-Methylpentane | 100-1000ml | 0.9993 | y=0.0070x-0.4358 | |
47.225 | 1-Hexene | 100-1000ml | 0.9998 | y=0.0094x-0.5080 | |
表3. 從TG-1色(se)譜柱流出的(de)各物質(zhi)的(de)保留時間(jian)及峰面積(ji)重復性(n=6)
保留時間/min | 峰名稱 | 保留時間RSD/% | 面積 RSD/% |
14.50 | n-Hexane | 0.02 | 0.42 |
16.98 | Methylcyclopentane | 0.02 | 1.22 |
17.24 | 2,4-Dimethylpentane | 0.01 | 0.61 |
19.03 | Benzene | 0.01 | 0.27 |
19.84 | Cyclohexane | 0.01 | 0.45 |
20.45 | 2-Methylhexane | 0.01 | 0.18 |
20.63 | 2,3-Dimethylpentane | 0.01 | 0.53 |
21.17 | 3-Methylhexane | 0.01 | 0.28 |
22.29 | 2,2,4-Trimethylpentane | 0.01 | 0.14 |
23.08 | n-Heptane | 0.02 | 0.14 |
24.79 | Methylcyclohexane | 0.01 | 0.33 |
26.85 | 2,3,4-Trimethylpentane | 0.01 | 0.17 |
27.19 | Toluene | 0.01 | 0.66 |
27.86 | 2-Methylheptane | 0.01 | 0.3 |
28.37 | 3-Methylheptane | 0.01 | 0.25 |
30.01 | n-Octane | 0.00 | 0.48 |
33.09 | Ethylbenzene | 0.00 | 1.05 |
33.60 | p/m-Xylene | 0.01 | 1.10 |
34.54 | Styrene | 0.01 | 0.52 |
34.83 | o-Xylene | 0.01 | 1.04 |
35.55 | Nonane | 0.01 | 0.64 |
36.48 | isopropybenzene | 0.01 | 0.91 |
37.93 | n-Propylbenzene | 0.00 | 1.11 |
38.24 | m-Ethyltoluene | 0.01 | 1.10 |
38.36 | p-Ethyltoluene | 0.01 | 1.28 |
38.59 | 1,3,5-Trimethylbenzene | 0.01 | 1.28 |
39.14 | o-Ethyltoluene | 0.01 | 1.32 |
39.8 | 1,2,4-Trimethylbenzene | 0.01 | 1.21 |
40.20 | n-Decane | 0.01 | 0.37 |
41.11 | 1,2,3-Trimethylbenzene | 0.01 | 1.01 |
42.04 | m-Diethylbenzene | 0.01 | 2.14 |
42.31 | p-Diethylbenzene | 0.01 | 1.37 |
43.93 | n-Undecane | 0.01 | 1.48 |
47.47 | n-Dodecane | 0.01 | 1.13 |
表4. 從TG-PLOT色譜柱流出的(de)各物質的(de)保留時(shi)間及峰(feng)面積重(zhong)復性(n=6)
保留時間/min | 峰名稱 | 保留時間RSD/% | 面積RSD/% |
9.57 | Ethylene | 0.29 | 0.70 |
11.51 | Acetylene | 0.37 | 2.63 |
15.35 | Ethane | 0.29 | 0.60 |
23.96 | Propylene | 0.39 | 0.40 |
26.06 | Propane | 0.24 | 1.56 |
27.19 | Isobutane | 0.23 | 1.93 |
27.94 | 1-Butene | 0.38 | 2.08 |
32.60 | n-Butane | 0.24 | 1.15 |
33.11 | Trans-2-Butene | 0.24 | 2.05 |
34.48 | Cis-2-Butene | 0.23 | 1.64 |
35.33 | Isopentane | 0.17 | 0.88 |
35.67 | 1-Pentene | 0.18 | 0.35 |
36.55 | n-Pentane | 0.17 | 0.31 |
39.86 | Isoprene | 0.19 | 0.25 |
40.86 | Trans-2-Pentene | 0.20 | 0.30 |
41.43 | Cis-2-Pentene | 0.18 | 0.35 |
42.34 | 2,2-Dimethylbutane | 0.14 | 1.04 |
42.90 | Cyclopentane | 0.11 | 1.07 |
43.05 | 2,3-Dimethylbutane | 0.08 | 1.38 |
43.14 | 2-Methylpentane | 0.34 | 1.29 |
44.17 | 3-Methylpentane | 0.17 | 0.53 |
47.23 | 1-Hexene | 0.18 | 0.73 |
3.2 環境氣(qi)體(ti)樣品分(fen)析
按照上述方(fang)法,我們(men)采用該套(tao)系(xi)(xi)統(tong)(tong)對實(shi)驗室(shi)(shi)內的(de)(de)(de)(de)環(huan)(huan)(huan)境空氣(qi)進行了連續(xu)監(jian)測分(fen)析(取樣體積為(wei)600ml),共監(jian)控了6天(tian)。圖(tu)4為(wei)在(zai)不(bu)同的(de)(de)(de)(de)監(jian)控時間下(xia)(xia)的(de)(de)(de)(de)樣品(pin)譜(pu)峰重疊(die),可以(yi)看(kan)出在(zai)連續(xu)6天(tian)的(de)(de)(de)(de)監(jian)控下(xia)(xia),各(ge)物(wu)質的(de)(de)(de)(de)譜(pu)峰并未發生明顯偏移,這對后續(xu)的(de)(de)(de)(de)準確定量提供了保(bao)證。通(tong)過對檢測結果的(de)(de)(de)(de)計算,在(zai)圖(tu)5中(zhong)(zhong)給(gei)出了正(zheng)己烷(wan)(wan)(wan)、甲基環(huan)(huan)(huan)戊烷(wan)(wan)(wan)、環(huan)(huan)(huan)己烷(wan)(wan)(wan)及甲苯的(de)(de)(de)(de)濃(nong)度變化曲(qu)線,可以(yi)看(kan)出實(shi)驗室(shi)(shi)中(zhong)(zhong)環(huan)(huan)(huan)己烷(wan)(wan)(wan)及正(zheng)己烷(wan)(wan)(wan)的(de)(de)(de)(de)含量相對較高,這與在(zai)實(shi)驗過程中(zhong)(zhong)其它儀器多(duo)采用這兩種試劑做樣品(pin)溶劑有一定關系(xi)(xi)。總體來(lai)看(kan),該套(tao)系(xi)(xi)統(tong)(tong)能夠滿(man)足對環(huan)(huan)(huan)境空氣(qi)的(de)(de)(de)(de)實(shi)時在(zai)線監(jian)測。
圖4.不同監控時間(jian)下環境空氣(qi)樣品在TG-1MS和(he)TG-PLOT柱子上的平行分(fen)離色譜圖(監控時間(jian)分(fen)別為0h、30h、60h、90h以及(ji)120h)
圖5.正(zheng)己烷(wan)、甲基環(huan)(huan)戊(wu)烷(wan)、環(huan)(huan)己烷(wan)及甲苯隨時(shi)間的濃度變化曲線
小結
本文采用蘇馬罐采樣,結合(he)Markes熱脫附(fu)儀(yi),以賽默飛(fei)Trace 1310氣相色譜配置雙FID檢測(ce)器和中心切割組件,建(jian)立了針對環(huan)(huan)境(jing)空氣56種臭(chou)氧前體物(wu)(wu)的分(fen)析測(ce)定方法(fa),可滿足(zu)對環(huan)(huan)境(jing)臭(chou)氧前體物(wu)(wu)的連續在(zai)線監測(ce)分(fen)析。
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