發(fā)布時間：2018-07-09 13:50

  本文選題：便攜式 + 液體陰極輝光放電��； 參考：《光譜學(xué)與光譜分析》2017年03期

【摘要】：鋰是綠色能源和輕質(zhì)合金的理想材料,作為一種重要的戰(zhàn)略資源而備受各國重視。鋰主要來源于鹽湖鹵水,我國鹽湖鹵水資源豐富,但主要分布在西部偏遠地區(qū),現(xiàn)場勘探和開采急需便攜分析儀器的支持,然而目前現(xiàn)有實驗分析技術(shù)均達不到野外現(xiàn)場分析的目標。近十年來,基于大氣壓液體陰極輝光放電光譜儀(SCGD-AES)因無需燃氣,載氣等氣流條件及真空環(huán)境而受到關(guān)注。在前人研究基礎(chǔ)上,自行開發(fā)了基于CCD光譜儀檢測系統(tǒng)的便攜式大氣壓液體陰極輝光放電光譜儀(簡稱Li-K分析儀),儀器長,寬,高分別為35,19和27 cm,重約為10 kg,十分有利于便攜。選擇Li的分析譜線波長為670.78 nm,以取自西藏兩種不同鹵水水化學(xué)類型樣品為研究對象,建立了鹵水中Li的快速分析方法。在最佳工作條件下測得Li的檢出限為4 ng·mL~(-1),方法的精密度(RSD)2%。研究表明,不同稀釋倍數(shù)時,Li的分析結(jié)果與ICP-MS分析結(jié)果相差較大,這可能與溶液的基體效應(yīng)有關(guān),而采用標準加入法可有效減小基體效應(yīng)的影響,獲得了與ICP-MS較為一致的分析結(jié)果,可提高分析結(jié)果的準確度。大量實驗結(jié)果表明,標準加入法只需2個點即可得到Li準確的分析結(jié)果,大大減少了實驗工作量,為便攜式Li-K分析儀在野外現(xiàn)場測定鹽湖鹵水中的Li奠定了方法學(xué)基礎(chǔ)。
[Abstract]:Lithium is an ideal material for green energy and light alloy. Lithium mainly comes from brine of salt lake. The brine resource of salt lake in China is abundant, but mainly distributed in the remote area of the west, so the field exploration and exploitation need the support of portable analysis instrument. However, the existing experimental analysis techniques do not reach the goal of field analysis. In recent ten years, liquid cathodic glow discharge spectrometer (SCGD-AES) based on atmospheric pressure has attracted much attention because of gas free, carrier gas and vacuum environment. On the basis of previous studies, a portable liquid cathode glow discharge spectrometer (Li-K analyzer) based on CCD spectrometer is developed. The instrument is of length, width and height of 35.19 cm and 27 cm respectively, and its weight is about 10 kg, which is very convenient for portability. A rapid method for the determination of Li in brine was established by using two samples of different brine chemical types from Tibet at a wavelength of 670.78 nm. The detection limit of Li was 4 ng mL ~ (-1) under the optimum working conditions, and the precision (RSD) of the method was 2%. The results show that the results of Li analysis with different dilution times differ greatly from those of ICP-MS analysis, which may be related to the matrix effect of solution, and the effect of matrix effect can be effectively reduced by standard addition method. The analytical results are consistent with those obtained by ICP-MS, and the accuracy of the analytical results can be improved. A large number of experimental results show that the standard addition method only needs 2 points to obtain the accurate analysis results of Li, which greatly reduces the experimental workload, and lays a methodological foundation for the field determination of Li in salt lake brine by portable Li-K analyzer.
【作者單位】： 國家地質(zhì)實驗測試中心;
【基金】：the Special Scientific Research Fund of Ministry of Land and Resources of China(201311013) Fundamental Research Funds of Chinese Academy of Geological Sciences(CSJ201607) the large resource investigation project of China(12120113091000)
【分類號】：TS312;O657.3

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本文編號：2109567