عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
شماره کتابشناسی ملی
شماره
TLpq304129049
زبان اثر
زبان متن نوشتاري يا گفتاري و مانند آن
انگلیسی
عنوان و نام پديدآور
عنوان اصلي
Identification and characterization of nitrogenous species in Brazilian petroleum by particle beam LC/MS
نام عام مواد
[Thesis]
نام نخستين پديدآور
J. W. Z. Mao
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
University of Rhode Island
تاریخ نشرو بخش و غیره
1994
مشخصات ظاهری
نام خاص و کميت اثر
128
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
Ph.D.
کسي که مدرک را اعطا کرده
University of Rhode Island
امتياز متن
1994
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
Analytical methodologies for the analysis of nitrogen containing compounds in a Brazilian diesel distillate by particle beam LC/MS, HPLC/UV, and GC/MS are presented. Basic and neutral nitrogen compounds are isolated by acid extraction and normal phase column chromatography. Alkylated carbazoles (C- to C5-) and benzoquinolines (C2- to C4-) are identified as the major nitrogen components in the neutral and basic fraction, respectively. The identification is accomplished by an analytical sequence combining liquid/gas chromatography, mass spectrometry, and UV spectroscopy. Both carbazole and benzoquinoline homologues are separated by reversed phase HPLC using a C18 column. Individual isomers of carbazoles are separated by normal phase HPLC using an alumina column. The separation of individual benzoquinoline isomers is achieved by reversed phase HPLC using acidified mobiles. The identification of various types of benzoquinolines (e.g. benzo (h) quinolines, benzo (f) quinolines, and acridines) is accomplished by a combination of LC/MS and HPLC/UV spectroscopy. The quantitation of each series of carbazoles and benzoquinolines is obtained by HPLC/UV. Using the developed methods, an Arabian straight-run diesel (SRD) and a light cycle oil (LCO) are analyzed for their neutral and basic nitrogen compounds. Results are compared to those obtained from the Brazilian diesel oil. A unique analytical approach is also described in which normal phase (alumina) HPLC with gradient elution is used to analyze diesel oils directly without any sample preparation. Using this method, alkylated carbazoles and indoles can be measured qualitatively and quantitatively at detection limits of low mg/L (ppm) level. The potential application of this direct analysis method on a routine basis is demonstrated for the rapid identification and quantitation of neutral nitrogen compounds in diesel oils. To confirm the identification and characterization of nitrogen compounds by LC/MS, diesel oils are also analyzed by conventional GC/MS methods. Results are compared to those obtained by LC/MS. The advantages and disadvantages of each techniques are discussed.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Analytical chemistry
موضوع مستند نشده
diesel oil
موضوع مستند نشده
Pure sciences
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )
مستند نام اشخاص تاييد نشده
J. W. Z. Mao
دسترسی و محل الکترونیکی
نام الکترونيکي
مطالعه متن کتاب وضعیت انتشار
فرمت انتشار
p
اطلاعات رکورد کتابشناسی
نوع ماده
[Thesis]
کد کاربرگه
276903
اطلاعات دسترسی رکورد
سطح دسترسي
a
تكميل شده
Y
