A novel reserved\|phase ion\|pair liquid chromatographic method using hexadecyltrimethylammonium bromide（HTMAB） as an ion\|pair reagent for separating the complexes of metal and 8\|hydroxyquinoline\|5\|sulphonic aci...A novel reserved\|phase ion\|pair liquid chromatographic method using hexadecyltrimethylammonium bromide（HTMAB） as an ion\|pair reagent for separating the complexes of metal and 8\|hydroxyquinoline\|5\|sulphonic acid（HQS） coupled with on\|line fluorescence detection has been developed. The chromatographic behavior of metal\|HQS complexes in the proposed system was systematically investigated.When the C\-\{18\} column modified by HTMAB and the suitable mobile phase coupled with fluorescence detection（\%λ\%\-\{ex\}=388 nm; \%λ\%\-\{em\}=518 nm） were employed, the detection limit of cadmium is 7.72 ng/mL with an injection volume of 20 μL, and the linear range of calibration curve for cadmium is 50\800 ng/mL. It was successfully applied to determination of bio\|available cadmium in polluted soils of China. Moreover, the possible species of Cd\|HQS on the column has been investigated by log\|log plot analysis.展开更多
为了提高凹凸棒石(ATP)的吸附性能,选用表面活性剂十六烷基三甲基溴化铵(CTAB)对ATP进行了改性,利用FT-IR和BET表征了改性前后的结构。通过正交试验探究了其吸附腐殖酸(HA)的较佳方案,并对吸附动力学模型进行分析。结果表明:正交试验中...为了提高凹凸棒石(ATP)的吸附性能,选用表面活性剂十六烷基三甲基溴化铵(CTAB)对ATP进行了改性,利用FT-IR和BET表征了改性前后的结构。通过正交试验探究了其吸附腐殖酸(HA)的较佳方案,并对吸附动力学模型进行分析。结果表明:正交试验中最优的方案为:pH值为6.5,在60℃下吸附10 min,体系中投加0.1 g ATP-CTAB,HA的吸附率为99.82%。ATP-CTAB吸附HA的影响因素顺序为:HA的初始浓度>ATP-CTAB投加量>温度>pH值>反应时间。吸附动力学结果表明,吸附拟合度△q_e<3.4%,R^2>0.996,过程遵循伪二级吸附动力学模型,吸附过程以化学吸附为主。展开更多
文摘A novel reserved\|phase ion\|pair liquid chromatographic method using hexadecyltrimethylammonium bromide（HTMAB） as an ion\|pair reagent for separating the complexes of metal and 8\|hydroxyquinoline\|5\|sulphonic acid（HQS） coupled with on\|line fluorescence detection has been developed. The chromatographic behavior of metal\|HQS complexes in the proposed system was systematically investigated.When the C\-\{18\} column modified by HTMAB and the suitable mobile phase coupled with fluorescence detection（\%λ\%\-\{ex\}=388 nm; \%λ\%\-\{em\}=518 nm） were employed, the detection limit of cadmium is 7.72 ng/mL with an injection volume of 20 μL, and the linear range of calibration curve for cadmium is 50\800 ng/mL. It was successfully applied to determination of bio\|available cadmium in polluted soils of China. Moreover, the possible species of Cd\|HQS on the column has been investigated by log\|log plot analysis.
文摘为了提高凹凸棒石(ATP)的吸附性能,选用表面活性剂十六烷基三甲基溴化铵(CTAB)对ATP进行了改性,利用FT-IR和BET表征了改性前后的结构。通过正交试验探究了其吸附腐殖酸(HA)的较佳方案,并对吸附动力学模型进行分析。结果表明:正交试验中最优的方案为:pH值为6.5,在60℃下吸附10 min,体系中投加0.1 g ATP-CTAB,HA的吸附率为99.82%。ATP-CTAB吸附HA的影响因素顺序为:HA的初始浓度>ATP-CTAB投加量>温度>pH值>反应时间。吸附动力学结果表明,吸附拟合度△q_e<3.4%,R^2>0.996,过程遵循伪二级吸附动力学模型,吸附过程以化学吸附为主。
