“…Some of their recommendations have been used in the routine analysis of trace organics in water (4). There are also many suggestions for the GC analysis of trace water in an organic solvent (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22). However, none of these has been widely accepted in practice, presumably for the following reasons: (1) the Karl Fischer titration method has become a de facto standard method for water content determination, and highly specialized and automated commercial units are readily available, (2) the reliability and accuracy of GC methods have not been well demonstrated for routine applications, (3) some GC methods are complicated and require both specialized personnel and analytical equipment which may not be readily available, and (4) some GC methods are tedious and inefficient and do not have general applicability.…”
“…Some of their recommendations have been used in the routine analysis of trace organics in water (4). There are also many suggestions for the GC analysis of trace water in an organic solvent (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22). However, none of these has been widely accepted in practice, presumably for the following reasons: (1) the Karl Fischer titration method has become a de facto standard method for water content determination, and highly specialized and automated commercial units are readily available, (2) the reliability and accuracy of GC methods have not been well demonstrated for routine applications, (3) some GC methods are complicated and require both specialized personnel and analytical equipment which may not be readily available, and (4) some GC methods are tedious and inefficient and do not have general applicability.…”
“…In addition, it cannot provide molecular identifications of the different conjugated diene types required for refinery guidance. There are also several techniques that have been developed based on ultraviolet (UV) spectroscopy, , precolumn reaction capillary GC, and polargraphy; none of these methods provide detailed information on the carbon number distributions. 1 MTAD Selectively and Rapidly Reacts with Linear and Cyclic Conjugated Dienes To Form the MTAD−Diene Adducts at Room Temperature 1 Gas chromatography−mass spectrometry (GC/MS) total ion chromatograms (TICs) of a model compound mixture before and after MTAD derivatization.…”
We report a new method for the detailed speciation and quantification of low levels of conjugated dienes (diolefins) in complex hydrocarbon matrixes, such as steam-cracked naphthas, catalytically cracked naphthas, and heavy coker naphthas. Conjugated dienes are responsible for hydrocarbon polymerization (fouling) in various refinery processes. Until now, complete analysis of conjugated dienes, particularly C 6 + conjugated dienes, was almost impossible, because of their low concentrations and severe matrix interference. Here, we show that selective derivatization of conjugated dienes with MTAD, in combination with gas chromatography-chemical ionization mass spectrometry (GC/CIMS) and gas chromatography-nitrogen chemiluminescence detection (GC/NCD) can be used to analyze the total conjugated dienes (up to C 10 ) in various hydrocarbon matrixes quantitatively.
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