电感耦合等离子体发射光谱法测定茶叶中元素

Determination of Elements in Tea by ICP-AES

采用密闭微波消解方法处理茶叶样品,通过电感耦合等离子体发射光谱(ICP-AES)法同时测定矿物质元素。分析了各待测元素分析线、仪器射频功率、雾化气流量及溶液酸度对测定结果的影响。23种元素的测定结果相对标准偏差为0.24(Co)6.59(K),检出限为0.0012.405μg/mL,该方法能够满足茶叶中Cd,B,Cu,Zn,As,Ga,Pb,Ba,Ti,Sr,Mn,Co,V,Cr,Al,Ca,Fe,K,Mg,Na,P,S,Si分析要求。方法具有良好的精密度和准确度。

Using a closed microwave digestion method for processing tea samples, the mineral elements were simultaneous determined by inductively coupled plasma-atomic emission spectrometry. The influence for experiment result, such as analysis line of various elements, RF power, nebulizer gas flow and the effects of acid, was investigated in detail. The experimental results showed that the detection limit for all measured elements was 0. 001 -2. 405μg/mL, RSD of 23 elements mentioned above were 0.24（Co） - 6.59 （ K）, the method was accurate for determining contents of Cd, B, Cu, Zn, As, Ga, Pb, Ba, Ti, St, Mn, Co, V, Cr, Al, Ca, Fe, K, Mg, Na, P, S and Si in tea. The method had good precision and accuracy.