Reagents are optimized for the simultaneous determination of trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in zinc sulfate solution, which contains an extremely large excess of Zn^(2+). First, the reagents and their d...Reagents are optimized for the simultaneous determination of trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in zinc sulfate solution, which contains an extremely large excess of Zn^(2+). First, the reagents and their doses for the experiment are selected according to the characteristics of the zinc sulfate solution. Then, the reagent doses are optimized by analyzing the influence of reagent dose on the polarographic parameters(i.e. half-wave potential E_(1/2) and limiting diffusion current I_p). Finally, the optimization results are verified by simultaneously determining trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in the presence of an extremely large excess of Zn^(2+). The determination results indicate that the optimized reagents exhibit wide linearity, low detection limits, high accuracy and good precision for the simultaneous determination of trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in the presence of an extremely large excess of Zn^(2+).展开更多
The simultaneous determination of total nitrogen (TN) and total phosphorus (TP) in seawater by micro-autoana- lyzer after persulphate oxidation was made. The relative error is less than 3. 8 % when TN is higher than 1...The simultaneous determination of total nitrogen (TN) and total phosphorus (TP) in seawater by micro-autoana- lyzer after persulphate oxidation was made. The relative error is less than 3. 8 % when TN is higher than 17. 7μmol/L and less than 5. 8 % when TP is higher than 0. 38 μmol/L. The recovery percentage of TN and TP are 96 %-123 % and 94 %-113 %. During iced conservation after persulphate oxidation, the concentrations of TN and TP did not change with time.展开更多
基金Projects(61533021,61321003,61273185)supported by the National Natural Science Foundation of ChinaProject(2015CX007)supported by the Innovation-driven Plan in Central South University,ChinaProject(13JJ8003)supported by the Joint Fund of Hunan Provincial Natural Science Foundation of China
文摘Reagents are optimized for the simultaneous determination of trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in zinc sulfate solution, which contains an extremely large excess of Zn^(2+). First, the reagents and their doses for the experiment are selected according to the characteristics of the zinc sulfate solution. Then, the reagent doses are optimized by analyzing the influence of reagent dose on the polarographic parameters(i.e. half-wave potential E_(1/2) and limiting diffusion current I_p). Finally, the optimization results are verified by simultaneously determining trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in the presence of an extremely large excess of Zn^(2+). The determination results indicate that the optimized reagents exhibit wide linearity, low detection limits, high accuracy and good precision for the simultaneous determination of trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in the presence of an extremely large excess of Zn^(2+).
文摘建立快速检测杜仲中两种黄酮苷元槲皮素与山奈酚的高效液相色谱方法，并测定水解前后杜仲叶与杜仲素黄酮苷元的含量。采用 HPLC 法同时测定黄酮苷元，色谱柱为 Diamonsil C18（4.6 mm ×250 mm，5μm），以甲醇-0.2％磷酸（63：37）为流动相，检测波长为370 nm，流速1.0 mL/ min，柱温为30℃。槲皮素和山奈酚分别在0.5~80μg/ mL 和0.5~18μg/ mL 内线性关系良好，该检测方法能迅速、准确检测水解前后杜仲叶和杜仲素中槲皮素和山奈酚的含量；水解工艺可明显提高杜仲黄酮苷元含量。
文摘The simultaneous determination of total nitrogen (TN) and total phosphorus (TP) in seawater by micro-autoana- lyzer after persulphate oxidation was made. The relative error is less than 3. 8 % when TN is higher than 17. 7μmol/L and less than 5. 8 % when TP is higher than 0. 38 μmol/L. The recovery percentage of TN and TP are 96 %-123 % and 94 %-113 %. During iced conservation after persulphate oxidation, the concentrations of TN and TP did not change with time.
