- 作者: 胡秋芬、楊光宇、黃章杰、尹家元
- 作者服務機構: Department of Chemistry, Yunnan University, Kunming, 650091, P. R. China
- 中文摘要: A new chromogenic reagent, 2-(2-quinolylazo)-5-dimethylaminoaniline (QADMAA) was synthesized. A highly sensitive, selective and rapid method for the determination of silver based on the rapid reaction of silver(I) with QADMAA was developed. In the presence of pH = 6.5 sodium citrate-sodium hydroxide buffer solution and sodium dodecyl sulfonate (SDS) medium, QADMAA reacts with silver to form a violet complex of a molar ratio 1:2 (silver to QADMAA). The molar absorptivity of the complex is 1.26 × 105 L. mol-1.cm-1 at 570 nm. Beer’s law is obeyed in the range of 0.01-0.6 μg/mL. The relative standard deviation for eleven replicate samples of 0.2 μg/mL silver is 1.76%. This method was applied to the determination of silver in water with good results.
- 英文摘要: --
- 中文關鍵字: Silver; Spectrophotometry; 2-(2-Quinolylazo)-5-dimethylaminoaniline.
- 英文關鍵字: --