|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ИНХС РАН |
||
Determination of rare earths elements in geological samples by LIBSтезисы доклада
- Авторы: Labutin T.A., Popov A.M., Zaytsev S.M., Zorov N.B.
- Сборник: Book of Abstracts Colloquium Spectroscopicum Internationale XXXIX
- Тезисы
- Год издания: 2015
- Место издания: Figueira da Foz, Portugal
- Первая страница: 265
- Последняя страница: 265
- Аннотация: Geochemical methods of ore deposits exploration are widely used by geological surveys and mining companies for all stages of the exploration process. Many companies provides such operations and spends about 15% of their exploration budgets for this purposes. The constant interest to the geochemical methods is provided due to relatively low cost and high reliability of the results. More than 300 ore deposits, including copper-nickel ones, were discovered with the use of geochemical prospecting. For example, the largest copper-porphyry deposit in Chile "Escondida" with copper reserves up to 28.0 million tons was discovered with its use. The introduction of new instruments for discrimination the geological 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 a 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. Rare earths elements (REE) are widely used in geology for characterization of minerals and ore bodies. But there are only few works on REE determination by LIBS due to significant spectral interferences between them and relatively low content. Therefore, the evaluation of sensitivity of the REE determination in 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 geological samples. We estimate the limit of detection of several REE (cerium, lanthanum, etc) in soils with the use of 3s-criterion. We also estimated the limitation of LIBS determination of REE due to the spectral interferences with the use of synthetic spectra which are sensitive to Stark broadening of lines in laser plasma.
- Добавил в систему: Попов Андрей Михайлович