High Accuracy Ion Mobility Spectrometry for Instrument Calibration.

Area of Science:

• Analytical Chemistry
• Physical Chemistry

Background:

• Ion mobility spectrometry (IMS) characterizes compounds using reduced mobility (K0) values.
• Calibrating IMS instruments with reference compounds improves accuracy but is limited by existing K0 value precision (±2%).
• Inaccurate reference K0 values propagate errors to compound of interest (COI) K0 measurements.

Purpose of the Study:

• To standardize reference K0 values with improved accuracy.
• To reduce error propagation in IMS analysis by enhancing reference measurement precision.
• To provide highly accurate K0 values for critical reference standards.

Main Methods:

• Characterized K0 values of ammonium, dimethyl methylphosphonate (DMMP), and three explosive COIs.
• Utilized an accurate ion mobility spectrometry instrument.
• Varied drift gas temperatures, water contents, and electric field strengths.

Main Results:

• Achieved K0 value accuracy of ±0.1% for all measured species.
• Minimized error from instrumental parameters through precise control.
• Established a more accurate dataset for IMS calibration.

Conclusions:

• Highly accurate K0 reference values are achievable.
• Improved accuracy in reference measurements significantly reduces error in COI K0 calculations.
• This work provides a foundation for more reliable and standardized IMS analyses.