Open-source autosampler for elemental and isotopic analyses of solids

Area of Science:

• Analytical Chemistry
• Materials Science
• Geochemistry

Background:

• Elemental and isotopic analyses are crucial across various scientific disciplines.
• Elemental analyzers commonly utilize autosamplers for sample handling.
• Existing commercial autosamplers can be expensive and have compatibility limitations.

Purpose of the Study:

• To present a novel, open-source autosampler designed for elemental and isotopic analysis of solid samples.
• To address limitations of commercial autosamplers, including cost, compatibility, and sample handling capacity.
• To improve the accuracy of elemental analysis by minimizing air contamination.

Main Methods:

• The autosampler features a sampling table with a carousel mechanism to move samples into an orifice.
• A purging pipe beneath the orifice removes ambient air before sample delivery to the reaction tube.
• The system was tested for elemental and isotopic analysis of nitrogen and carbon.

Main Results:

• The purging pipe effectively minimized air contamination, crucial for elements like nitrogen and oxygen.
• Results for elemental and isotopic composition of nitrogen and carbon were within specified limits.
• The open-source autosampler demonstrated lower build and maintenance costs compared to commercial options.

Conclusions:

• The developed open-source autosampler offers a cost-effective, versatile solution for elemental and isotopic analysis.
• It provides universal compatibility, handles bulky samples, and accommodates larger sample batches.
• The design minimizes air contamination, ensuring accurate analysis, and shows potential for analyzing other elements like oxygen, hydrogen, and sulfur.