本文選題：MC-ICP-MS + 煤中Li同位素��； 參考：《河北工程大學(xué)》2017年碩士論文

【摘要】：中國煤中發(fā)現(xiàn)了Li的富集情況并被認為富有很高的經(jīng)濟價值。因此對煤中Li的研究成為煤科學(xué)領(lǐng)域的又一重要話題。在地球化學(xué)領(lǐng)域里,Li同位素被視為杰出的示蹤元素,已被用到很多領(lǐng)域解決諸多地球化學(xué)的現(xiàn)象,并取得了豐碩成績。因此煤中的鋰同位素的研究將有助于厘清煤中Li的來源問題。國內(nèi)目前涉及到煤中Li同位素的研究工作還很少,想要把這一有效手段運用到解決與煤相關(guān)的地質(zhì)應(yīng)用問題,最重要的是形成煤中Li同位素相關(guān)的解析思路。本研究首先對Li含量不同的三種煤元素標準樣品(SARM18、SARM19、SARM20)探討了合適的Li同位素前處理的方法,然后進行同位素的精確測定,建立起煤中Li同位素的分離及測定方法。然后對官板烏素富鋰6#煤樣品進行了Li同位素特征分析,并結(jié)合對煤層夾矸和物源區(qū)花崗巖的Li同位素研究,初步得出以下認識結(jié)論:(1)利用微波消解技術(shù),使用HNO3-HF酸體系消解煤樣,三種煤元素標準樣品測得的Li元素含量與推薦值在誤差范圍內(nèi)保持一致。(2)使用0.5 N硝酸作為淋洗液,運用AG 50W-X12陽離子交換樹脂柱完成一遍過柱,過柱后Na/Li1,有效將煤中Li同位素分離富集。(3)官板烏素6#煤樣的Li同位素+6.03‰到+8.49‰之間,平均值+7.04‰。研究結(jié)果表明,本研究建立的煤中Li同位素分離測定方法,滿足煤中Li同位素分析的需要。得出6#煤高含量的Li主要存在于高嶺石當中的結(jié)論。這為進一步研究煤中鋰的來源提供了鋪墊。
[Abstract]:Li enrichment has been found in Chinese coal and is considered to be of high economic value. Therefore, the study of Li in coal becomes another important topic in the field of coal science. Li isotopes are regarded as outstanding tracer elements in geochemistry and have been used in many fields to solve many geochemical phenomena. Therefore, the study of lithium isotopes in coal will help to clarify the source of Li in coal. At present, there are few researches on Li isotopes in coal in China. If we want to apply this effective method to solve the geological application problems related to coal, the most important thing is to form the analytical thinking of Li isotopic correlation in coal. In this study, three standard samples of coal elements with different Li contents, SARM18, SARM19 and SARM20, were studied firstly. The suitable pretreatment method of Li isotopes was discussed, then the accurate determination of isotopes was carried out, and the separation and determination of Li isotopes in coal were established. Then, the Li isotopic characteristics of Guanbanwusu Li-rich 6 # coal sample are analyzed, and the Li isotopic study of the gangue and granite in the source area of coal seam is studied. The following conclusions are drawn preliminarily: 1) Microwave digestion technology is used. Coal samples were digested by HNO3-HF acid system. The content of Li in the standard samples of three kinds of coal elements was consistent with the recommended value within the error range.) 0.5 N nitric acid was used as the eluent and the AG 50W-X12 cation exchange resin column was used to complete the column. After the column, Na / L _ 1 can effectively separate and enrich the Li isotopes in coal. 3) the Li isotopes of Gangbanwusu 6 # coal samples range from 6.03 鈥，

本文編號：1842204