Sample preparation and presentation , Solvents
المؤلف:
Sue Jickells , Adam Negrusz (Editors)
المصدر:
Clarkes Analytical Forensic Toxicology
الجزء والصفحة:
416
2026-11-11
66
Sample preparation and presentation
Solvents
Change of solvent may markedly affect the intensity and spectral distribution of fluorescence. It is inadvisable, therefore, to alter the solvent specified in established methods without careful preliminary investigation. Many compounds are fluorescent in organic solvents but virtually nonfluorescent in water. Thus, a number of solvents should be tried before it is decided whether or not a compound is fluorescent. In many organic solvents, the intensity of fluorescence is increased by elimination of dissolved oxygen, which has a strong quenching effect. Oxygen may be removed by bubbling an inert gas, such as nitrogen or helium, through the test specimen.
0
0
الاكثر قراءة في تحليل السموم
اخر الاخبار
اخبار العتبة العباسية المقدسة
