Treatment of yellow dye 23 by heterogeneous Fenton-like process was studied using iron rich soil as an iron source. The iron rich soil sample was characterized by XRD, SEM and BET analysis. XRD pattern indicates that ...Treatment of yellow dye 23 by heterogeneous Fenton-like process was studied using iron rich soil as an iron source. The iron rich soil sample was characterized by XRD, SEM and BET analysis. XRD pattern indicates that the iron rich soil is made of goethite and hematite. The reaction was systematically investigated under various experimental conditions such as pH, iron rich soil dosage, oxidant and dye concentrations. The result revealed that using iron rich soil as catalyst led to high discoloration efficiency (97.71% for 140 min of treatment) at pH = 2.5, 2 g/L iron rich soil and 16 m·mol/L H<sub>2</sub>O<sub>2</sub>. The degradation kinetics of acid yellow 23 can be described by a pseudo-first-order reaction following the Langmuir-Hinshelwood mechanism. The main roles of hydroxyl radicals in degradation process were investigated by adding of various radical scavengers.展开更多
目的：建立同时测定白蒲黄片中7种五环三萜皂苷类成分白头翁皂苷A3、白头翁皂苷B4、23-羟基白桦脂酸、白头翁皂苷B、白头翁皂苷C、刺人参苷S和齐墩果酸的HPLC-MS法。方法：采用Diamonsil ODS C18（250 mm×4.6 mm,5μm）色谱柱,流...目的：建立同时测定白蒲黄片中7种五环三萜皂苷类成分白头翁皂苷A3、白头翁皂苷B4、23-羟基白桦脂酸、白头翁皂苷B、白头翁皂苷C、刺人参苷S和齐墩果酸的HPLC-MS法。方法：采用Diamonsil ODS C18（250 mm×4.6 mm,5μm）色谱柱,流动相为含0.1%甲酸的水（A）-含0.1%甲酸的甲醇（B）,梯度洗脱程序为25%A（0 min）,5%A（0-6 min）,5%A（6-14min）,25%A（保持6 min）,流速0.8 m L·min-1,柱温30℃,进样量10μL;采用正离子和负离子模式同时监测,正离子和负离子监测模式下源喷射电压分别为5.5 k V和-4.5 k V,离子源温度为650℃,雾化气（Gas 1）344 k Pa,加热气（Gas 2）412 k Pa,接口持续加热,帘气172 k Pa,全程氮气通入状态。结果：在14 min内白蒲黄片中7种有效成分白头翁皂苷A3、白头翁皂苷B4、23-羟基白桦脂酸、白头翁皂苷B、白头翁皂苷C、刺人参苷S和齐墩果酸被完全分离;峰面积与其浓度呈良好的线性;平均回收率范围为95.11%-107.3%,RSD为0.86%-3.26%。结论：本文建立的方法经验证简便、重现性好、专属性高,可为白蒲黄片质量控制提供参考。展开更多
文摘Treatment of yellow dye 23 by heterogeneous Fenton-like process was studied using iron rich soil as an iron source. The iron rich soil sample was characterized by XRD, SEM and BET analysis. XRD pattern indicates that the iron rich soil is made of goethite and hematite. The reaction was systematically investigated under various experimental conditions such as pH, iron rich soil dosage, oxidant and dye concentrations. The result revealed that using iron rich soil as catalyst led to high discoloration efficiency (97.71% for 140 min of treatment) at pH = 2.5, 2 g/L iron rich soil and 16 m·mol/L H<sub>2</sub>O<sub>2</sub>. The degradation kinetics of acid yellow 23 can be described by a pseudo-first-order reaction following the Langmuir-Hinshelwood mechanism. The main roles of hydroxyl radicals in degradation process were investigated by adding of various radical scavengers.
文摘目的：建立同时测定白蒲黄片中7种五环三萜皂苷类成分白头翁皂苷A3、白头翁皂苷B4、23-羟基白桦脂酸、白头翁皂苷B、白头翁皂苷C、刺人参苷S和齐墩果酸的HPLC-MS法。方法：采用Diamonsil ODS C18（250 mm×4.6 mm,5μm）色谱柱,流动相为含0.1%甲酸的水（A）-含0.1%甲酸的甲醇（B）,梯度洗脱程序为25%A（0 min）,5%A（0-6 min）,5%A（6-14min）,25%A（保持6 min）,流速0.8 m L·min-1,柱温30℃,进样量10μL;采用正离子和负离子模式同时监测,正离子和负离子监测模式下源喷射电压分别为5.5 k V和-4.5 k V,离子源温度为650℃,雾化气（Gas 1）344 k Pa,加热气（Gas 2）412 k Pa,接口持续加热,帘气172 k Pa,全程氮气通入状态。结果：在14 min内白蒲黄片中7种有效成分白头翁皂苷A3、白头翁皂苷B4、23-羟基白桦脂酸、白头翁皂苷B、白头翁皂苷C、刺人参苷S和齐墩果酸被完全分离;峰面积与其浓度呈良好的线性;平均回收率范围为95.11%-107.3%,RSD为0.86%-3.26%。结论：本文建立的方法经验证简便、重现性好、专属性高,可为白蒲黄片质量控制提供参考。
