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    1. 服務項目

      激光微區原位主微量元素分析
      發布時間: 2021-03-09 13:01:43來源:上譜分析瀏覽次數: 1564
      測試項目:激光微區原位主微量元素分析

      測試對象:鋯石、斜鋯石、磷灰石、獨居石、榍石、黑鎢礦、白鎢礦、鈦鈾礦、錫石、剛玉、橄欖石、輝石、石榴石、長石、角閃石、云母、綠松石、磁鐵礦、黃鐵礦以及有孔蟲、貝殼等碳酸鹽和磷酸鹽類等礦物質

      測試周期:提前2-4周預約,5-10個工作日可完成測試。黃鐵礦等特殊礦物集中機時測試,請提前1個月預約,10-20個工作日可完成測試??商峁y試加急服務。

      送樣要求:1、樣品長度不超過5cm,寬度不超過3cm,厚度不超過0.8cm;2、需測試單礦物可以選擇24μm、32μm、44μm三種不同束斑;3、為保證單礦物不被打穿,片子不宜過薄,常規測試剝蝕深度在5-20μm之間。

      完成標準:儀器狀態良好,監控標樣測試值在國際推薦值誤差范圍內。



      方法描述:

      16.1單礦物LA-ICP-MS微區原位微量元素分析

      單礦物微區原位微量元素含量在武漢上譜分析科技有限責任公司利用LA-ICP-MS完成,詳細的儀器參數和分析流程見Zong et al. (2017)。GeolasPro激光剝蝕系統由COMPexPro 102 ArF 193 nm準分子激光器和MicroLas光學系統組成,ICP-MS型號為Agilent 7700e。激光剝蝕過程中采用氦氣作載氣、氬氣為補償氣以調節靈敏度,二者在進入ICP之前通過一個T型接頭混合,激光剝蝕系統配置有信號平滑裝置(Hu et al., 2015)。本次分析的激光束斑和頻率分別為××µm和××Hz。單礦物微量元素含量處理中采用玻璃標準物質BHVO-2G,BCR-2G和BIR-1G進行多外標無內標校正(Liu et al., 2008)。每個時間分辨分析數據包括大約20-30 s空白信號和50 s樣品信號。對分析數據的離線處理(包括對樣品和空白信號的選擇、儀器靈敏度漂移校正以及元素含量計算)采用軟件ICPMSDataCal (Liu et al., 2008)完成。

      16.2 In-situ trace element analysis of minerals by LA-ICP-MS

      Trace element analysis of minerals was conducted by LA-ICP-MS at the Wuhan SampleSolution Analytical Technology Co., Ltd., Wuhan, China. Detailed operating conditions for the laser ablation system and the ICP-MS instrument and data reduction are the same as description by Zong et al. (2017). Laser sampling was performed using a GeolasPro laser ablation system that consists of a COMPexPro 102 ArF excimer laser (wavelength of 193 nm and maximum energy of 200 mJ) and a MicroLas optical system. An Agilent 7700e ICP-MS instrument was used to acquire ion-signal intensities. Helium was applied as a carrier gas. Argon was used as the make-up gas and mixed with the carrier gas via a T-connector before entering the ICP. A “wire” signal smoothing device is included in this laser ablation system (Hu et al., 2015). The spot size and frequency of the laser were set to ××µm and ××Hz, respectively, in this study. Trace element compositions of minerals were calibrated against various reference materials (BHVO-2G, BCR-2G and BIR-1G) without using an internal standard (Liu et al., 2008). Each analysis incorporated a background acquisition of approximately 20-30 s followed by 50 s of data acquisition from the sample. An Excel-based software ICPMSDataCal was used to perform off-line selection and integration of background and analyzed signals, time-drift correction and quantitative calibration for trace element analysis (Liu et al., 2008).
      References
      Zong, K.Q., Klemd, R., Yuan, Y., He, Z.Y., Guo, J.L., Shi, X.L., Liu, Y.S., Hu, Z.C., Zhang, Z.M., 2017. The assembly of Rodinia: The correlation of early Neoproterozoic (ca. 900 Ma) high-grade metamorphism and continental arc formation in the southern Beishan Orogen, southern Central Asian Orogenic Belt (CAOB). Precambrian Research, 290, 32–48.
      Hu, Z.C., Zhang, W., Liu, Y.S., Gao, S., Li, M., Zong, K.Q., Chen, H.H., Hu, S.H., 2015. “Wave” Signal-Smoothing and Mercury-Removing Device for Laser Ablation Quadrupole and Multiple Collector ICPMS Analysis: Application to Lead Isotope Analysis. Analytical Chemistry, 87(2), 1152–1157.
      Liu, Y.S., Hu, Z.C., Gao, S., Günther, D., Xu, J., Gao, C.G. and Chen, H.H., 2008. In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard. Chemical Geology, 257(1-2): 34-43.

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      美女裸体无遮挡掩免费视频