Prodigy DC arc method for direct determination of trace elements such as Ag, Sn and B in geologic samples

DC arc spectroscopy technology has many advantages that are difficult to be achieved by other technologies in the detection of many solid materials. Some of the earliest instruments that relied on photographic plate inspection technology are still in use today. These instruments permanently record the spectrogram of the sample, but the processing of information is also cumbersome and daunting. Since then, these photodetector detectors have been gradually replaced by photomultiplier tubes (PMTs), thereby greatly improving the efficiency of sample detection. However, the photomultiplier tube technology also has drawbacks. It can neither simultaneously obtain background correction information nor record the full spectrum information of the sample.

The introduction of the solid-state detector array has greatly impacted the traditional DC arc spectroscopy system based on the PMT detector, because the solid-state detector technology has faster analysis capabilities and can permanently record the full spectrum information of the sample. The Prodigy DC arc spectrometer involved in this article uses the latest large-area programmed L-PAD detector, with full spectrum coverage, and also has real-time background correction, single-element multi-spectral line optional, timing analysis and other functions. Geological samples have the characteristics of poor conductivity, complex matrix, easy splashing, and low sample content, which have caused many difficulties in the development of analysis methods for such samples; if conventional digestion methods are used for analysis, there are great challenges. First of all, the digestion process is very complicated and takes a long time. In addition, it may also bring pollution during the digestion process. More importantly, during the digestion process, the dilution process makes the content of some elements far below the detection limit of the instrument. Many uncertainties are brought to the result.

This test is mainly based on the opinions of the geological system expert group, provided by the Hunan Geological Institute of standard samples and geological samples, Zhu hard group sub-testing center (Leeman cooperative laboratory) to provide technical support, jointly analyze the geological samples, mainly discuss Prodigy The ability of arc spectrometer to analyze geological ore samples. Experiments show that through the selection of the best wavelength and background correction point, Prodigy has excellent analytical sensitivity and accuracy for difficult-to-analyze impurity elements such as Ag, Sn, and B in geologic samples.

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