摘要
用ICPAES法研究了绿茶和红茶对水溶液中镉(Ⅱ)、铅(Ⅱ)的捕集行为,考察了时间、pH、温度等因素的影响。结果表明,绿茶对水中镉(Ⅱ)、铅(Ⅱ)的捕集30min基本达到平衡,而红茶的捕集平衡时间约为60min。当pH<4时捕集率随pH值减小而显著降低,当pH>4时捕集率变化趋缓;当pH<6时茶样对铅(Ⅱ)的捕集率大于镉(Ⅱ),而当pH>6之后则正相反,这与不同酸度的溶液中茶叶的带电状态及镉(Ⅱ)、铅(Ⅱ)的形态分布有关。升高温度有利于绿茶对镉(Ⅱ)、铅(Ⅱ)的捕集,而红茶变化不大;捕集后的镉(Ⅱ)、铅(Ⅱ)在25℃下用水洗脱困难,其中绿茶与铅(Ⅱ)的相互作用较强。
The adsorption behaviors of Cd(II) and Ph(II) on green tea and black tea in aqueous solution as well as the influences of time, acidity and temperature on the adsorption have been studied. It was found that Cd(II) and Pb(II) can been adsorbed strongly by green tea and black tea samples. The adsorption effects depend on the pH strongly when pH<4. The recovery of Pb(II) on tea samples is more than that of Cd(II) when pH<6 and it is opposite when pH>6. It is difficult to elute Cd(II) and Ph(II) from tea samples by water at 25 degreesC.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2004年第11期1444-1446,共3页
Spectroscopy and Spectral Analysis
