摘要
研究了以微乳液为介质时.锌与5-Br-PADAP的显色反应,选择了560 nm为测定波长,445nm为参比波长,锌含量在0.1-0.5μg/mL范围内符合比尔定律。该法用于测定茶叶中的锌含量,结果满意。
The colour reaction of zinc( Ⅱ ) with 2-(5-Bromo-2-pyridylazo)-5-diethylam inophenol in microemulsion was studied. Zinc( Ⅱ ) reacts with 5-Br-PADAP to form a stable complex at pH 9.0. Its apparent molar absorptivity is ε= 1.064 × 10^5 L-(mol· cm)^-1 at 560nm. The Beer's low is obeyed in the range of 0.1-0.5μg/mL for zinc( Ⅱ ). The method is used to determine zinc( Ⅱ ) in tea samples with .satisfactory results.
出处
《广州化工》
CAS
2007年第4期56-57,共2页
GuangZhou Chemical Industry
关键词
分光光度法
做乳液
锌
茶叶
spectrophotometry
microemulsion
zinc
tea