不同消解方法对青钱柳茶叶中6种有益元素含量的影响

Effects of Different Digestion Methods on the Contents of Six Beneficial Elements in Cyclocarya Paliurus Tea

目的测定青钱柳茶叶中6种有益元素的含量,并比较3种消解方法对所测元素的含量影响。方法青钱柳茶叶样品分别经干法消解、湿法消解、石墨消解处理后,用电感耦合等离子体发射光谱法(ICP-OES)同时测定Ca、K、Mg、Mn、Zn、Cu6种元素含量,并进行方法学考察。结果 3种消解方法测得的6种元素R2为0.9988~0.9999,RSD为0.1%~5.2%,回收率为82.4%~101.8%,均符合测定要求。青钱柳茶叶中Ca、K、Mg、Zn元素含量丰富;湿法消解具有优越性,Ca、K宜选用湿法,Mg、Mn 3种方法均可,Zn宜选用干法和湿法,Cu宜选用干法消解。结论湿法消解相较干法消解、石墨消解具有优越性,石墨消解作为新兴的消解技术具有很大开发潜力。

OBJECTIVE To determine the content of six beneficial elements in Cyclocarya paliurus Tea and compare effects of three digestion methods on the content of the measured elements. METHODS The samples of Cyclocarya paliurus Tea were treated by dry digestion, wet digestion and graphite digestion, respectively. Then, 6 elements(Ca, K, Mg, Mn, Zn and Cu) were simultaneously determined by inductively coupled plasma optical emission spectrometry(ICP-OES) and carried out methodological investigation. RESULTS The six elements R^2 measured by the three digestion methods were 0.998 8-0.999 9, the RSD was 0.1%-5.2%, and the recovery rate was 82.4%-101.8%, all of which met the measurement requirements. Cyclocarya paliurus Tea was rich in Ca, K, Mg and Zn. Wet digestion has superiority. Ca, K could be selected by wet method. Mg and Mn were all available. Dry and wet methods were preferred for Zn. Cu was suitable for dry digestion. CONCLUSION The wet digestion method has superiority to dry digestion and graphite digestion. Graphite digestion has great potential for development as an emerging digestion technology.