一类萤光酮试剂的析相体系研究5──二溴苯基萤光酮析相光度法测定微量铝

Phase Separation Spectrophotomtric Determination of Trace Al with Al-DBPF-TritonX-100

研究了铝－二溴苯基萤光酮－ＴｒｉｔｏｎＸ－１００析相显色体系，建立了测定茶叶中微量铝的析相光度法。在ｐＨ５．０的六次甲基四胺－盐酸缓冲介质中，铝－二溴苯基萤光酮－ＴｒｉｔｏｎＸ－１００胶束溶液在９５℃加热１ｈ，配合物即被ＴｒｉｔｏｎＸ１００相完全富集。最大吸收峰为５６４ｎｍ，铝含量０～９μ／５ｍＬ服从比耳定律，方法，应用于茶叶微量铝的测定，结果满意。

The optimum condition of the phase separation colour reaction of Al-dibromophenylfluorone (DBPF) with TritonX-100 has been studied and a method for the determination of trace Al in tea has proposed.In pH5 0(CH 2) 6N 4-HCl buffer mediumn,the complex can be collected in TritonX100 phase when heating at 95℃ for 1h in a boiling water bath.The apparent motar absorptivity of the complex is 5 2×10 4L·mol -1 ·cm -1 at 564nm.Beet’s law is obeyed in the range of 0 to 9μg/5mL.the proposed method has been applied to determination of trace amounts of Al in teas with satistactory results.