A highly sensitive fluorescence quenching method for the determination of chromium(VI)based on the system of Cr(VI)OFluorophenylfluorone(OFPF)cetyltrimethylammonium bromide(CTMAB)sodium tartrate(Tartrate)was developed...A highly sensitive fluorescence quenching method for the determination of chromium(VI)based on the system of Cr(VI)OFluorophenylfluorone(OFPF)cetyltrimethylammonium bromide(CTMAB)sodium tartrate(Tartrate)was developed.In a pH 420～480 medium of HAcNaAc,chromium(VI)reacts with OFPF,CTMAB and Tartrate to form a nonfluorescent mixed complex and quenches the fluorescence intensity of OFPF.There is a linear relationship between fluorescence quenching intensity and concentration of chromium(VI)from 0 to 02μg/25ml.The detection limit for Cr(VI)is 01μg/L.The method has been applied to the determination of trace chromium(VI)in water samples with satisfactory results.展开更多
The distribution of mitomycin(MIT) for injection in aqueous surfactant two phases(ASTP), consisted of cetyltrimethylammonium bromide(CTAB) and sodium oleate(SO) has been studied by spectrophotometry. The results show ...The distribution of mitomycin(MIT) for injection in aqueous surfactant two phases(ASTP), consisted of cetyltrimethylammonium bromide(CTAB) and sodium oleate(SO) has been studied by spectrophotometry. The results show that for ASTP system with a certain ratio of CTAB to SO the volume of the upper phase decreased and that of the lower phase increased with increase of MIT added, while the distribution ratio K d and single extraction yield Y of MIT in two phases remained approximately constant.展开更多
文摘A highly sensitive fluorescence quenching method for the determination of chromium(VI)based on the system of Cr(VI)OFluorophenylfluorone(OFPF)cetyltrimethylammonium bromide(CTMAB)sodium tartrate(Tartrate)was developed.In a pH 420～480 medium of HAcNaAc,chromium(VI)reacts with OFPF,CTMAB and Tartrate to form a nonfluorescent mixed complex and quenches the fluorescence intensity of OFPF.There is a linear relationship between fluorescence quenching intensity and concentration of chromium(VI)from 0 to 02μg/25ml.The detection limit for Cr(VI)is 01μg/L.The method has been applied to the determination of trace chromium(VI)in water samples with satisfactory results.
文摘The distribution of mitomycin(MIT) for injection in aqueous surfactant two phases(ASTP), consisted of cetyltrimethylammonium bromide(CTAB) and sodium oleate(SO) has been studied by spectrophotometry. The results show that for ASTP system with a certain ratio of CTAB to SO the volume of the upper phase decreased and that of the lower phase increased with increase of MIT added, while the distribution ratio K d and single extraction yield Y of MIT in two phases remained approximately constant.
