Spectrophotometric determination of silver with 2-(2-quinolylazo)-5-diethylaminoaniline.
A new chromogenic reagent, 2-(2-quinolylazo)-5-diethylaminoaniline (QADEAA) was synthesized. A highly sensitive, selective and rapid method for the determination of silver based on the rapid reaction of silver (I) with QADEAA has been developed. In the presence of sodium citrate-sodium hydroxide buffer solution (pH 6.5) and sodium dodecyl sulfonate (SDS) medium, QADEAA reacts with silver to form a violet complex of molar ratio 1:2 (silver to QADEAA). The molar absorptivity of the complex is 1.39x10(5) l mol(-1) cm(-1) at 580 nm. Beer's law is obeyed in the range of 0.01-0.6 mug ml(-1). The relative standard deviation for 11 replicate samples of 0.2 mug ml(-1) is 1.67%. This method can be applied to the determination of silver in water with satisfactory results.
Hu
Qiufen
Q
Department of Chemistry, Yunnan University, North CuiHu Road 52 Kunming 650091, PR China; Department of Chemistry, Yuxi Normal College, Yuxi 650091, PR China.
Guangyu
Yang
Y
Huang
Zhangjie
Z
Yin
Jiayuan
J