Analysis of Trace Elements in Corncob by Microwave Digestion-ICP-AES
SUN Yong1,2,ZHANG Jin-ping1,2,YANG Gang1,2,LI Zuo-hu1*
1. National Key Laboratory of Biochemical Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100080,China 2. Graduate School of the Chinese Academy of Sciences,Beijing 100039,China
摘要: 采用微波消解处理样品,以电感耦合等离子体发射光谱法(ICP-AES)测定了我国北京、山东、吉林、云南、新疆、甘肃、山西、陕西、江苏、内蒙十个省区玉米芯中Zn,Mg,Mn,Sr,Fe,Pb,Cu和Se八种元素的含量。加入1.5 mL 68%的HNO3以及0.5 mL HF作为消解剂,在400 W微波功率下3步即可完全将样品消解。测定上述八种元素的相对偏差及回收率分别为: 0.72%~4.16%,95.5%~104.5%;1.58%~3.66%,98.2%~103.5%;0.19%~4.58%,97.0%~103.2%;1.31%~4.90%,95.7%~104.1%;1.40%~4.01%,95.9%~104.6%;1.55%~4.28%,95.1%~104.5%;2.16%~5.00%,96.4%~103.5%;2.00%~4.99%,95.1%~101.3%。方法快速、简便、灵敏度高、准确性好,可多元素同时测定,且无损失和环境污染小。
关键词:微波消解;ICP-AES;玉米芯;微量元素
Abstract:The contents of trace elements of Zn,Mg,Mn,Sr,Fe,Pb,Cu and Se in the corncob collected from Beijing,Shandong, Jilin, Yunnan, Xinjiang, Gansu,Shanxi, Shaanxi, Jiangsu, Neimeng in China were determined by ICP-AES using microwave digestion. The optimum condition of digesting the corncob was: put 1.5 mL of 68% nitric acid and 0.5 mL of hydrofluoric acid in the pot,then digested the sample with 3 steps under the 400 W power in the microwave oven. This digesting procedure could completely and quickly digest the sample. The relative standard deviations and recovery yield are 0.72%-4.16% and 95.5%-104.5% for Zn,1.58-3.66% and 98.2%-103.5% for Mg,0.19%-4.58% and 97.0%-103.2% for Mn,1.31%-4.90% and 95.7%-104.1% for Sr,1.40%-4.01% and 95.9%-104.6% for Fe,1.55%-4.28% and 95.1%-104.5% for Pb,2.16%-5.00% and 96.4%-103.5% for Cu,and 2.00%-4.99% and 95.1%-101.3% for Se,respectively. The analysis of the trace metals by the method of ICP-AES using the method of microwave digestion proved to be easily operational,rapid,highly sensitive,and accurate. It could be adopted as the method of determining many elements simultaneously.
Key words:Microwave digestion;ICP-AES;Corncob;Trace elements
孙勇1,2,张金平1,2,杨刚1,2,李佐虎1*. 微波消解-ICP-AES法测定玉米芯中的微量元素含量[J]. 光谱学与光谱分析, 2007, 27(07): 1424-1427.
SUN Yong1,2,ZHANG Jin-ping1,2,YANG Gang1,2,LI Zuo-hu1*. Analysis of Trace Elements in Corncob by Microwave Digestion-ICP-AES. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(07): 1424-1427.
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