摘要
为了探寻通过饮茶来补尝人本必需矿物质和微量元素的可能性,用全反射X-射线萤光法(TXRF)对福建乌龙茶进行了分析。十四种元素(磷、硫、钾、钙、钛、锰、铁、镍、铜、锌、铷、锶、钡、铅)被同步测定,所测茶叶中磷、硫、钾、钙的含量范围为2700至22000μg/g,锰、铁为210至1500μg/g,钛、镍、铜、锌、铷、锶、钡为 2.2至 150 μg/g,铅含量低于 2.1μg/g(均为干基)。茶汤中钾、铷、镍的浸出率范围为32%至75%,磷、硫、锰、铜、锌、锶浸出率为10%至38%,钙为7%至11%,铁为2%至3%。茶汤中钛、钡、铅的含量低于TXRF法的检测限。茶样的硒含量由氢化物发生原子吸收法(HG-AAS)测定,茶叶硒含量范围为 48至 570ng/g。
Oolong tea from the Fujian Province is very popular at home and abroad. specially in Taiwan and Southeast Asia In order to elucidate the possibilities tp cpmpensate the need essential elements in the tea drinks a set of samples of oolong tea from the Fujian Province were analyzed by total reflection X-ray fluorescence (TXRF).The contents of fourteen ele- ments P.S.K.Ca.Ti.Mn.Fc.Ni.Cu.Zn.Rb.Ba and Pbweredetermined simultaneously the element concentrations in tea leaves were from 2700 to 22000 μg/g for P.S.K and Ca. from 2 10 to 1500 μg/g for Mn and Fe .from 2.2 to 1 500μg/g forTi.Ni.Cu Zn. Rb. Sr. and Ba. and below 2. 1 μp g/g for Pb .referred to the dry sample mass basis. The solubility of K .Rb and Ni in infusions was between 32% and 75% that of P,S,Mn,Cu,Zn and Sr between 10% and 38% that of Ca between 7% and 11%. and that of Fe between 2% and 3%. The contents of Ti,Ba and Pb could not be detected by TXRF in the infusions. Selenium contents in these tea samples and their infusions were determined by hydride generation atomic absorption spectrometry (HG-AAS). The contents in tea leaves were found from 48 to 570ng/g.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2000年第1期51-54,共4页
Food Science
关键词
乌龙茶
元素分析
X-射线萤光法
原子吸收法
Oolong Element tea analysis
Total reflection X-ray fluorescence (TXRF)
Hydride generation atomic absorption apectrometry (HG-AAS)