论文部分内容阅读
目的采用电感耦合等离子体发射光谱法(ICP-OES)测定稀土元素的检出限和定量限,对比稀土元素溶液混合标准物质(CCS-1)微波消化前和消化后加标测得的回收率的不同,并对比同一稀土元素不同发射波长的回收率。方法采用ICP-OES法测定茶叶中各稀土元素不同发射波长下的含量,采用微波消解前和消解后加标的方法,测定16种稀土元素的56条谱线的回收率。结果微波消化前加标和消化后加标得到的回收率无明显差异,不同发射波长得到的回收率亦无明显差异,但低、中、高浓度的加标回收率结果有明显差异。部分稀土元素的个别谱线低浓度加标回收率超出90%~110%,中、高浓度加标回收率基本都为90%~110%。结论同一稀土元素不同发射波长虽然回收率有区别,但均能满足实验要求,因此可以根据样品中稀土元素含量选择分析线,从而更快、更准确地测定稀土元素含量。
OBJECTIVE To determine the limit of detection and limit of quantification of rare earth elements by inductively coupled plasma atomic emission spectrometry (ICP-OES), and to compare the recoveries obtained before and after digestion by Microwave Digestion (CCS-1) Of the different rare earth elements and compare the different emission wavelength recovery. Methods The ICP-OES method was used to determine the content of rare earth elements in tea at different emission wavelengths. The recoveries of 56 spectra of 16 rare earth elements were determined by microwave digestion before and after digestion. Results There were no significant differences in recoveries between spiked and digested spiked samples before microwave digestion, and no significant differences in recovery rates at different emission wavelengths. However, the spiked recoveries of low, medium and high concentrations were significantly different. Some rare earth elements of the individual lines of low concentration spike recovery of more than 90% to 110%, medium and high concentration spike recovery basically 90% to 110%. CONCLUSIONS Although the recovery rates of the same rare earth elements at different emission wavelengths are different, they all meet the experimental requirements. Therefore, the analysis line can be selected according to the content of rare earth elements in the sample, so that the content of rare earth elements can be measured more quickly and accurately.