新荧光试剂1-(4-羟基水杨醛缩氨基)-8-羟基-3,6-萘二磺酸钠荧光熄灭法测定痕量铬(Ⅵ)

Determination of Trace Chromium (Ⅵ) with a New Reagent[1-(4-Hydroxysolicylideneamino)-8-Hydroxy-3,6-Naphthalenedisulfonic Acid,Disodium Salt]by Fluorescence Quenching Method

本文采用荧光熄灭法研究了席夫碱试剂1－（4－羟基水杨醛缩氨基）－8－羟基－3，6－萘二磺酸钠（HSHND）测定Cr（VI）的方法和条件。在pH＝4．2的邻苯二甲酸氢钾缓冲体系中，该试剂的激发波长为λex＝361nm，荧光发射波长为λem＝420nm，铬（VI）浓度在5．0－20．0μg／10mL范围内呈良好的线性关系，检出限为2．0μg／10mL。本法的灵敏度及选择性好，操作简单快速，无需加热。用于环境煤飞灰中痕量总铬的测定，结果满意。

This paper deals with a new flurometric reagent , [ 1 - (4 - hydroxysolicylideneamino ) - 8 - hydroxy -3, 6 - naphthalnedisulfonic acid, disodium salt] which was synthesized by our labarotory and used to determine chromiun (VI ). The optium conditions have been studied. The linear range is 5.0 ~ 20.0μg Cr (VI ) /10mL and the minimum detection limit is 2.0μg Cr (VI ) /10mL. The method is applied successfully to the determinaion of chromium (VI ) in coal fly ash.