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1.
为弥补标准检测方法的不足,建立了石墨消解-ICP-MS法同时检测铜精矿中Pb、Cd、As 和Hg等4种有害元素。确定了样品前处理和仪器分析条件。用铜精矿标准样品和参考样品分别进行7次重复实验,Pb、Cd和As的检测结果均在标准值范围内,Hg的检测结果与参考值基本一致。7次重复检测结果的变异系数符合GB/T 27417-2017《合格评定 化学分析方法确认和验证指南》要求。选择5种不同物相铜精矿作为待测样品,通过与标准方法比对,两种方法检测结果的绝对差符合标准方法的再现性要求,说明本方法适用于不同种类的铜精矿。本方法操作简单,可同时测定多种有害元素,实用性强。 相似文献
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微波消解-电感耦合等离子体-原子发射光谱法测定油墨中的铅、铬和钡 总被引:1,自引:0,他引:1
建立了微波消解-电感耦合等离子体-原子发射光谱法(ICP-AES)测定油墨中铅、钡和铬元素的分析方法.实验选用钇作为内标物,以减少背景干扰.结果表明,各元素校准曲线的相关系数均为0.9999,样品相对标准偏差小于5%,加标回收率在96.7%-98.8%之间.实验具有较好的精密度和准确性,适合油墨中铅,铬,钡元素的分析. 相似文献
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An optimized digestion method coupled to electrochemical detection to monitor lead, copper, cadmium and mercury in fish tissues was developed. Square wave anodic stripping voltammetry (SWASV) coupled to disposable screen-printed electrodes (SPEs) was employed as fast and sensitive electroanalytical method for heavy metals detection. Different approaches in digestion protocols were assessed. The study was focused on Atlantic hake fillets because of their wide diffusion in the human nutrition. Best results were obtained by digesting fish tissue with hydrogen peroxide/hydrochloric acid mixture coupled to solid phase (SP) purification of the digested material. This combined treatment allowed quantitative extraction from fish tissue (muscle) of the target analytes, with fast execution times, high sensitivity and avoiding organic residues eventually affecting electrochemical measurements. Finally, the method has been validated with reference standard materials such as dogfish muscle (DORM-2) and mussel tissues (NIST 2977). 相似文献
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Gong Cheng Ping Chen Zhi-Gang Wang Xiao-Jing Sui Ji-Lin Zhang Jia-Zuan Ni 《Analytica chimica acta》2014
A simple, fast, efficient, and reusable microwave-assisted tryptic digestion system which was constructed by immobilization of trypsin onto porous core-shell Fe3O4@fTiO2 microspheres has been developed. The nanostructure with magnetic core and titania shell has multiple pore sizes (2.4 and 15.0 nm), high pore volume (0.25 cm3 g−1), and large surface area (50.45 m2 g−1). For the proteins, the system can realize fast and efficient microwave-assisted tryptic digestion. Various standard proteins (e.g., cytochrome c (cyt-c), myoglobin (MYO), β-lactoglobulin (β-LG), and bovine serum albumin (BSA)) used can be digested in 45 s under microwave radiation, and they can be confidently identified by mass spectrometry (MS) analysis; even the concentration of substrate is as low as 5 ng μL−1. Furthermore, the system for the 45 s microwave-assisted tryptic digestion is still effective after the trypsin-immobilized microspheres have been reused for 5 times. Importantly, 1715 unique proteins from 10 μg mouse brain proteins can be identified with high confidence after treatment of 45 s microwave-assisted tryptic digestion. 相似文献
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一次消解测定蔬菜中多种重金属的简捷方法 总被引:1,自引:0,他引:1
针对一般实验室检测人员少,检测任务重的问题,研究了蔬菜通过一次湿化消解后,消解液可以测定多种重金属元素的方法,大大提高了效率,减轻了工作量. 相似文献
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