ICP-AES法测定玉米秸秆中的微量元素含量

采用高压硝化罐处理样品,以ICP-AES法测定了我国山西、北京、新疆、山东、内蒙、甘肃、陕西、吉林、云南、江苏10个不同省区不同品种玉米秸秆中Zn,Mg,Mn,Sr,Fe,Co,Ni和Se八种微量元素的含量.实验确定加入5 mL硝酸、3 mL高氯酸以及3 mL氢氟酸,将硝化罐置于130℃油浴中4 h,即可将样品完全消解.此方法测定各地区玉米秸秆中Zn的回收率在96.5%～103.8%之间,Mg的回收率在98.0%～102.5%之间,.Mn的回收率在95.7%～104.1%之间,Sr的回收率在97.1%～103.2%之间,Fe的回收率在95.1%～101.3%之间,Co的回收率在95.1%～104.5%之间,Ni的回收率在97.0%～103.5%之间以及se的回收率在95.9%～104.6%之间.所有元素测定结果的相对标准偏差均小于5.00%.方法简便、快速、灵敏度高、准确性好、可多元素同时测定,且对环境污染小.

Analysis of Trace Elements in Corn Stover by ICP-AES

The contents of trace elements of Zn, Mg, Mn, Sr, Fe, Co, Ni and Se in the corn stover collected from Shanxi, Beijing, Xinjiang, Shandong, Neimeng, Gansu, Shaanxi, Jilin, Yunnan and Jiangsu, 10 different provinces in China, were determined by ICP-AES using nitrifying method of high pressure nitrifying pot. This method proved to be easily operational, rapid, highly sensitive, and accurate, and can be adopted as the method of determining many elements simultaneously. The recovery yields of Zn, Mg, Mn, Sr, Fe, Co, Ni and Se are 96.5%-103. 8%, 98. 0%-102.5%, 95.7%-104. 1%, 97. 1%-103. 2%, 95.1%-101.3%, 95.1%-104. 5%, 97. 0%-103. 5% and 95.9%-104. 6%, respectively, and the relative standard deviation of all the elements is all below 5.00%.