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中文摘要：
建立了一种新型分离方法——双水相气浮浮选光度法，使其处理环境水样中痕量土霉素（OTC）残留物，研究了其工作原理，并用高效液相色谱法对该方法的可靠性进行了验证。利用自制的双水相气浮浮选装置，选择四氢呋喃作亲水有机溶剂、质量分数为10％的NaCl溶液作分相剂，NaOH溶液调节pH，将Cu^2＋与OTC形成的疏水配合物浮选至有机相，实现OTC与水样分离。浮选完毕后，经紫外-可见分光光度法分析，线性回归方程为A=1．532×10^5c＋0．1230（其中：A为有机相的吸光度；c为水样的OTC摩尔浓度，mol／L），相关系数为0．9998，该方法的线性范围为4．8×10^-7～7．3×10^-5mol／L，OTC加标回收率为99．5％～100．1％。
英文摘要：
The paper presents a novel and green analytical method for measurement of trace level oxytetracycline （OTC） in water samples. An aliquot of CuSO4 solution was added to the sample to form hydrophobic Cu^2＋ -OTC complex which was separated and concentrated by solvent （tetrahydrofuran） extraction and gas floatation before measurement by the HPLC; NaCl, NaOH were employed to provide the optimal ionic strength for extraction/floatation at pH of 8. The method is accurate, highly reproducible and applicable over a wide concentration range （4.8 × 10^-7 to 7.3× 10^-5 tool/L） with a very low detection limit of 5.1 × 10^-8 mol/L.
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