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
文摘研究了废水中阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)的Fenton氧化降解.考察了H2O2及Fe2+的浓度、pH值和反应时间对去除效果的影响.优化后的降解反应的条件是:pH为3.0,H2O2与CTAB浓度质量比为1∶2.3,Fe2+质量浓度为20.0 mg.L-1.当CTAB初始质量浓度为20.0 mg.L-1时,在最佳反应条件下,CTAB的去除率可在30 m in达到90%以上,H2O2浓度的增大有助于提高TOC的去除率.降解产物中检出CHOOH和CO2等.实验结果表明Fenton氧化降解法可以快速有效除去废水中的季铵盐阳离子表面活性剂.
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.