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The geometry of this detector was also evaluated. The use of an extended jet improved significantly the peak shape. The GC\u00d7GC separation was studied using both first and second dimension columns with different internal diameters. The use of a thicker film in both dimensions provided better performance. LODs of 0.16\u20138.49 pg of individual compounds were achieved. Two different extraction techniques of the neutral and basic nitrogen\u2010containing compounds were also evaluated. The method using ion\u2010exchange resins to separate neutral and basic nitrogen\u2010containing compounds was more efficient than the method using modified silica. As an example, the amounts (\u03bcg\/g) of each class reported were: indole (2.77), alkyl carbazoles ranging from C<jats:sub>0<\/jats:sub> to C<jats:sub>6+ <\/jats:sub>(1.467), alkyl benzocarbazoles from C<jats:sub>0 <\/jats:sub>to C<jats:sub>4+<\/jats:sub> (793), alkyl quinolines (31.2) and alkyl benzoquinolines (21.6) were quantitated.<\/jats:p>","DOI":"10.1002\/jssc.200700172","type":"journal-article","created":{"date-parts":[[2007,11,15]],"date-time":"2007-11-15T10:46:40Z","timestamp":1195123600000},"page":"3223-3232","source":"Crossref","is-referenced-by-count":53,"title":["Qualitative and quantitative study of nitrogen\u2010containing compounds in heavy gas oil using comprehensive two\u2010dimensional gas chromatography with nitrogen phosphorus detection"],"prefix":"10.1002","volume":"30","author":[{"given":"Carin","family":"von M\u00fchlen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eniz C.","family":"de Oliveira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul D.","family":"Morrison","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudia A.","family":"Zini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elina B.","family":"Caram\u00e3o","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philip J.","family":"Marriott","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2007,12,11]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1128\/MMBR.67.4.503-549.2003"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0167-7799(98)01237-2"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/0016-2361(85)90104-8"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0146-6380(02)00018-9"},{"key":"e_1_2_1_6_2","doi-asserted-by":"crossref","unstructured":"Tissot B. 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