热脱附-气相色谱-质谱法筛查分析溶剂型涂料中挥发性有机化合物-豆柴文库

您所在位置：网站首页 / 热脱附-气相色谱-质谱法筛查分析溶剂型涂料中挥发性有机化合物.docx / 文档详情

在线预览结束，喜欢就下载吧，查找使用更方便

5 金币

下载文档

/ 2

下载提示

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

文本预览

热脱附-气相色谱-质谱法筛查分析溶剂型涂料中挥发性有机化合物
Introduction
Solvent-basedcoatingsarewidelyusedfortheirexcellentperformanceindiverseapplicationsincludingautomotive,aerospace,andindustrialcoatings.However,thevolatileorganiccompounds(VOCs)emittedbysolvent-basedcoatingsposeasignificantthreattohumanhealthandtheenvironment.Therefore,reliableandsensitiveanalyticalmethodsarerequiredforthequantificationandidentificationofVOCsinsolvent-basedcoatings.Inthisregard,thermaldesorption-gaschromatography-massspectrometry(TD-GC-MS)hasemergedasapowerfultoolforthescreeningandcharacterizationofVOCsinsolvent-basedcoatings.Thispaperaimstodiscusstheprinciples,methodologyandapplicationsofTD-GC-MSforVOCsanalysisinsolvent-basedcoatings.
Principles
TD-GC-MSinvolvesthefollowingsteps:
1.Thermaldesorption:Thesolvent-basedcoatingsampleisthermallydesorbedinafurnaceoratubularovenundercontrolledtemperatureandpressureconditions.TheligandsdesorbfromthecoatingmaterialmatrixandpassthroughatransferlinetotheGC-MSanalyticalsystem.
2.Gaschromatography:ThedesorbedVOCsareseparatedusinggaschromatography(GC)basedontheirphysicochemicalpropertiessuchasboilingpoint,polarity,andmolecularsize.TheGCcolumniseitherpackedorcapillary,andthemobilephaseisagassuchasheliumornitrogen.
3.Massspectrometry:TheseparatedVOCsareionizedandfragmentedinamassspectrometer(MS),whichgeneratesamassspectrarepresentingthemolecularionsandthefragments.ThemassspectraarecomparedtoaspectrallibrarytoidentifytheVOCs.
Methodology
TheTD-GC-MSmethodologyinvolvesthefollowingsteps:
1.SelectionofasuitableTDsystem:TheTDsystemisselectedbasedonthesamplesize,theVOCsofinterest,andthesensitivityrequired.TheTDsystemscanbebasedoneitheradsorptionorabsorptionmedia.
2.Samplepreparation:Thesolvent-basedcoatingsampleishomogenizedandweighed,andthecoatingmatrixcanberemovedbysolidphasemicroextraction(SPME)orheadspacesampling.ThesampleisthenloadedintoaTDtubeorcartridge,whichisinsertedintheTDsystem.
3.Desorptionconditionsoptimization:Thedesorptiontemperature,durationandflowrateareoptimize