Objective:The chemical components of the essential oil from Ainsliaea pertyoides were firstly studied.Methods:The essential oil was extracted by steam distillation and analyzed by GC/MS technique.Results:34 compositio...Objective:The chemical components of the essential oil from Ainsliaea pertyoides were firstly studied.Methods:The essential oil was extracted by steam distillation and analyzed by GC/MS technique.Results:34 compositions were isolated and identified representing 90.34% of the total contents of the essential.Conclusion:The essential oil from Ainsliaea pertyoieds mainly consists of sesquiterpenoids.展开更多
The Cr 6+ in water sample is separated,enriched by low pressure cathodic ion Chromatography and is determined with spectrophotometry.The optimal experimental conditions are also explored.The result is satisfactory in ...The Cr 6+ in water sample is separated,enriched by low pressure cathodic ion Chromatography and is determined with spectrophotometry.The optimal experimental conditions are also explored.The result is satisfactory in that the instruments and equipment used in experiment are ordinary,the manipulation is easy,other cations in water sample don’t interfere in the determination of Cr 6+ and the multiplicity of enrichment may reach 100 Limit concentration being 1.06×10 -4 mg/L,RSD 0.1%,rate of recovery,97.9～103.8.展开更多
文摘Objective:The chemical components of the essential oil from Ainsliaea pertyoides were firstly studied.Methods:The essential oil was extracted by steam distillation and analyzed by GC/MS technique.Results:34 compositions were isolated and identified representing 90.34% of the total contents of the essential.Conclusion:The essential oil from Ainsliaea pertyoieds mainly consists of sesquiterpenoids.
文摘The Cr 6+ in water sample is separated,enriched by low pressure cathodic ion Chromatography and is determined with spectrophotometry.The optimal experimental conditions are also explored.The result is satisfactory in that the instruments and equipment used in experiment are ordinary,the manipulation is easy,other cations in water sample don’t interfere in the determination of Cr 6+ and the multiplicity of enrichment may reach 100 Limit concentration being 1.06×10 -4 mg/L,RSD 0.1%,rate of recovery,97.9～103.8.
