tailieunhanh - Introduction to Modern Liquid Chromatography, Third Edition part 85

Introduction to Modern Liquid Chromatography, Third Edition part 85. High-performance liquid chromatography (HPLC) is today the leading technique for chemical analysis and related applications, with an ability to separate, analyze, and/or purify virtually any sample. Snyder and Kirkland's Introduction to Modern Liquid Chromatography has long represented the premier reference to HPLC. This Third Edition, with John Dolan as added coauthor, addresses important improvements in columns and equipment, as well as major advances in our understanding of HPLC separation, our ability to solve problems that were troublesome in the past, and the application of HPLC for new kinds of samples. . | 796 SAMPLE PREPARATION organic solvents requires indirect heating via the placement of a microwave-absorbing device in the extraction vessel. These devices are usually rods or a powder of a microwave-absorbing material such as carbon black coated with an inert polymeric substance . PTFE that will not contaminate the sample. Multiple samples can be simultaneously processed in a microwave oven so the sample throughput can be very highcompared to me ofthe other liquid-solid etfraction techniques. Commercd lisyrtems e rapachy -01 -11 to24enttactihn vessels. Microwavooehroation iaa widelu ycytpetdaltnrdatiuy toOoxh et Pda mSE and other liquiddyohdexmctionteclmiqufSi Fnmexompie EPAMelhod 3546 -86 is a MAE aroctOurefrscxtraeoinswater-insolubie oeslinUsldwntrt-so u0leorgonic compounds ureticidht OerOicidet nCBs rtc. tromtgHe olayt sedimemtosSunaet and solid c m. 1x11 10111 0 1 8 eiaco vtltO So im C indieth 17eprlm y closed vessel codtaienogrhesampleany orqomc suSoevtll Ahelute ree eeiet ere equivalentfo tnotefaom Soxniet exteootina Mtdiod354ne87 bueuseless solgent and take signidcentlp eesstime COhUehtNaSW TCHING waa dhaurte. in Ooetions and . It is a powerful technique for sample preparation discussed here as well as for two-dimensional separation Section . For sample preparation a portion of the chromatggram froman initialcolumn column 1 . the enrichment column of Fig. is selectively transferred to a second column column 2 . the analytical colcmmof fyr fuodttrteparation. preparation it usenfor . o t ot OOW .rlot fa. .s 0 removoioSlase-eluterspnorto colcmn2 removoi ofioeecferanoev hlat aon oveodonshclyte dandi inaclomn 2 trvcseemchment The achievemeoeufono os more of rhete goo ofrenrctoha in increased sample throughput due to mepreeonfetisnofa cleanee semola a the column. Unwanted interferences cav be nueated fn wash- sc gockf 1sneS ru .

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