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Determination of Copper and Silver in Geological Samples by Double-pulse LIBSтезисы доклада
- Авторы: Labutin T.A., Popov A.M., Zaytsev S.M., Rubtsov G.S., Bugaev I.A., Kalko I.A., Zorov N.B.
- Сборник: Book of Abstracts EMSLIBS 2013 Bari (Italy) September 16-20, 2013
- Серия: Euro-Mediterranean Symposium on Laser Induced Breakdown Spectroscopy
- Том: 7
- Тезисы
- Год издания: 2013
- Место издания: University of Bari Bari, Italy
- Первая страница: 159
- Последняя страница: 159
- Аннотация: Geochemical methods of ore deposits exploration are widely used by geological surveys and mining companies for all stages of the exploration process. The majority of largest companies (135 of the 150) carries out such operations in 11 countries and isolates for this of about 12-15% of their exploration budgets. The increased interest in the geochemical methods is provided due to relatively low cost and high reliability of the results. More than 300 ore deposits, including coppernickel ones, were discovered with the use of geochemical prospecting. The "discovery of the century" - the copper-porphyry deposit in Chile Escondida" with copper reserves up to 28.0 million tons is among them. The introduction of new instruments for geochemical works to discriminate the richest samples in the field will improve the efficiency of prospecting. Compact systems for rapid determination of the mineral composition, based on Laser-Induced Breakdown Spectroscopy (LIBS), provides an unique opportunity to implement the requirements for routine analysis of geochemical samples: sensitivity of a wide range of elements below the mean abundance in the earth’s crust, rapid, and low cost technique. Therefore, the development of methodological and practical aspects of the rapid determination of the elemental composition of rocks and soils by the LIBS is highly beneficial. This purpose requires improving the analytical capabilities of LIBS to analyze traces of metals in the studied types of objects trust and selectively. The valuable markers for copper and polymetallic ores are silver and copper. We should provide their reliable determination at content levels close to the geochemical anomaly. We used the double-pulse LIBS (the combination of second and third harmonics of Q-switch Nd:YAG laser) to achieve in geological samples the level of sensitivity below the mean abundance in the earth’s crust. Such scheme of additional excitation of plasma significantly improved detection limits. The values calculated by 3s-criterion were 0.22 ppm for silver and 8 ppm for copper in geological samples.
- Добавил в систему: Лабутин Тимур Александрович