以3，5－二溴水杨醛缩氨基硫脲为荧光萃取剂测定水中阳离子表面活性剂

Extraction- fluorimetric determination of cationics in water using 3, 5-dibromosalicylaldehyde-thiosemicarbazone

以３，６－二溴水杨醛缩氨基硫脲（３，５－ＤＢＳＴＳ）为试剂，提出了萃取荧光法，用于废水中微量阳离子表面活性剂的测定，探讨了反应机理。ＣＴＭＡＢ的检出限为１．８×１０￣（－８）ｍｏｌ／Ｌ，λ＿（ｅｘ）／λ＿（ｏｍ）＝４００ｎｍ／４６０ｎｍ。

A new Schiff base 3, 5-dibromosalicylaldehydethiosemicarbazone (3, 5-DBSTS) has been used as afluorogenic reagent. In ammoniac solution (pH = 9),cetyltrimethylammonium bromide (CTMAB) reacts with 3, 5-DBSTS to form a fluorescent ion pair which can be extracted by chloroform. The fluorescence intensity of chloroform extract is linear over 2×10-7～1.2×10-5mol/L of CTMAB. So a new sensitive extraction fluorimetric method for the determination of cationics in waste water has been developed.The fluorescence measurements of extract are made at excitation and emission wayelengths of 400nm and 460nm, respectively.