原子吸收法测定枸杞子矿物质元素的三种前处理方法比较

发布时间：2018-06-20 00:42

本文选题：矿物质元素 + 干灰化法　；参考：《光谱学与光谱分析》2017年03期

【摘要】：采用干灰化法、HNO_3-H_2O_2湿法消解法和HNO_3-HClO_4湿法消解法分别处理枸杞子样品,利用原子吸收光谱法测定各组样品中Na,K,Ca,Mg,Fe,Cu,Zn,Ni,Pb,Cd十种元素的含量,探讨简单、快捷、准确地测定枸杞子中矿物质元素的前处理方法。结果表明:干灰化法的回收率范围为89.88%~102.15%,标准偏差(RSD)3.037%;HNO_3-H_2O_2湿法消解法的回收率范围为92.34%~103.21%,标准偏差(RSD)2.751%;HNO_3-HClO_4湿法消解法的回收率范围为94.52%~102.10%,标准偏差(RSD)2.496%;三种方法均具有较好的准确度和精密度,但相对于干灰化法和HNO_3-H_2O_2湿法消解法,HNO_3-HClO_4湿法消解法回收效果较好,精密度更高。HNO_3-HClO_4湿法消解法测得Na,K,Ca,Mg元素含量的平均值高于干灰化法和HNO_3-H_2O_2湿法消解法,差异有统计学意义(p0.05)。此外,HNO_3-HClO_4体系湿法消解法耗时短、消耗试剂量少、消解完全。因而,HNO_3-HClO_4体系湿法消解法可作为原子吸收光谱法测定枸杞子矿物质元素含量较好的前处理方法。
[Abstract]:The dry ash method was used to treat the wolfberry samples by the wet digestion method of HNOK _ 3-S _ 3-H _ 2O _ 2 and the wet digestion method of HNO-3-HClO4. The content of ten kinds of elements (such as Nahlkine CaMg-MgFeCuCuCuPbH2O2) in each group of samples was determined by atomic absorption spectrometry (AAS), and the discussion was simple and quick. An accurate method for the determination of Mineral elements in Lycium barbarum L. The results show that the recovery range of dry ashing method is 89.88 / 102.15, the standard deviation is 3.037 and the recovery range of the wet digestion method is 92.34343H _ 2O _ 2. The recovery range of standard deviation is 94.522 / 102.102.102.102.106.The three methods have good accuracy and precision. But compared with dry ash method and HNO3-H _ 2O _ 2 wet method, HNO-3-HClO _ 4 wet digestion method has better recovery effect, and the average value of NaHNO3-HClO4 wet digestion method is higher than that of dry ash method and HNO3-H _ 2O _ 2 wet digestion method, the difference is significant (p 0.05). In addition, the method of wet digestion of HNO3-HClO4 system takes a short time, consumes less reagents, and is completely digested. Therefore, the wet digestion method of HNO3-HClO4 system can be used as a good pretreatment method for the determination of mineral elements in wolfberry by atomic absorption spectrometry.
【作者单位】：兰州大学公共卫生学院;甘肃省林业科学研究院;
【基金】：国家自然科学基金项目(81402703)和(81550046)资助
【分类号】：TS207.3;O657.31

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