Development and Application of Full Spectrum Direct Reading Arc Emission Spectrometer E5000 and Its Application in Geochemical Sample Analysis

Abstract

In geochemical sample analysis, some elements such as Ag, B, Sn are difficult to analyze. Traditional alternating current Arc Emission Spectrometry is used to analyze them, for example Spectrograph and Multi-channel Arc Emission Spectrometer. However, due to their complex operation, the increasing demands of geochemical samples and requirement of analysis quality, makes these methods unsuitable for a large number of samples requiring daily analyses. A new Full Spectrum Direct Reading Emission Spectrometer E5000 has been developed, based on newly designed arc source and Paschen-Runge type CCD spectrometer. E5000 Emission Spectrometer has many innovations and is described in this paper. An electrode is positioned by laser diode and driven by a motor to achieve a high precision electrode position. With E5000, a photo plate is unnecessary, so the spectrum will not be influenced by emulsion characteristics of a photo plate. Also with CCD type full spectrum technology, inference element correction and spectrum background correction can be easily achieved. Stream sediments and soils samples have been tested with the E5000 Spectrometer, and the detection limits of Ag, B, Sn are 0.01 μg/g, 0.65 μg/g, 0.16 μg/g, and analysis precision of stream sediments and soils samples are less than 10%, demonstrating that this method meets the analysis quality requirement for geochemical samples.

Keywords

• full spectrum direct reading
• arc source emission spectrometer
• laser location
• background subtraction
• interference correction
• geochemical sample