title: [Analysis of trace elements in corncob by microwave digestion-ICP-AES].
abstract: The contents of trace elements of Zn, Mg, Mn, Sr, Fe, Pb, Cu and Se in the corncob collected from Beijing, Shan-dong, 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.
authors.affiliation: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China. ysun@home.ipe.ac.cn
authors.forename: Yong
authors.initials: Y
authors.lastname: Sun
authors.forename: Jin-Ping
authors.initials: JP
authors.lastname: Zhang
authors.forename: Gang
authors.initials: G
authors.lastname: Yang
authors.forename: Zuo-Hu
authors.initials: ZH
authors.lastname: Li
mesh_terms: D002681:China; D003300:Copper / Q000032:analysis; D005843:Geography; D006858:Hydrofluoric Acid / Q000737:chemistry; D007501:Iron / Q000032:analysis; D007854:Lead / Q000032:analysis; D008274:Magnesium / Q000032:analysis; D008345:Manganese / Q000032:analysis; D008872:Microwaves; D017942:Nitric Acid / Q000737:chemistry; D015203:Reproducibility of Results; D012643:Selenium / Q000032:analysis; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013324:Strontium / Q000032:analysis; D014131:Trace Elements / Q000032:analysis*; D003313:Zea mays / Q000737:chemistry*; D015032:Zinc / Q000032:analysis
chemical_list: D014131:Trace Elements; D007854:Lead; D017942:Nitric Acid; D008345:Manganese; D003300:Copper; D007501:Iron; D012643:Selenium; D008274:Magnesium; D015032:Zinc; D006858:Hydrofluoric Acid; D013324:Strontium