双水相气浮浮选光度法分离/测定废水中痕量土霉素

摘要

利用自制的浮选装置,选择四氢呋喃作溶剂,氯化钠作分相剂,NaOH溶液调节酸度,将Zn(Ⅱ)与土霉素(OTC)形成的疏水性缔合物浮选至有机相,直接用分光光度法测定含量,方法线性回归方程为A=2.046×10~5c(mol/L)+0.015,相关系数为0.999 6,线性范围为1.7×10~(-7)9.3×L10~(-5) mol/L;检出限为7.16×10~(-8) mol/L;回收率为98.7%～100.5%;表观摩尔吸光系数为2.046×10~5 L/(mol·cm),适用于废水中痕量土霉素的分离/富集及分析测定.%The hydrophobic complex composed of Zn(Ⅱ) and oxytetracycline(OTC) was floated into organic phase under the optimal conditions:pH=9, tetrahydrofuran as organic solvent, sodium chloride as separating phase reagent on the home-made floatation equipment. The data was obtained by spectrophotometry after floatation, the linear regression equation was A=2.046×10~5c(mol/L)+0.015, linear range was from 1.7×10~(-7) to 9.3×10~(-5) mol/L, correlation coefficient(r) was 0.999 6, relative recovery was 98.7%～100.5%, and the limit of detection was 7.16×10~(-8) mol/L. It can be applied to the analysis of trace OTC in waste water.