Identification and Analysis of the Impurities for Triethylboron by GC‐MS Method

Abstract The detection and separation of impurities are crucial for the quality control of triethylboron. While the purity of triethylboron is the key factor for ballistic performance, impact accuracy, and storage safety. This work will explore a modified gas chromatography‐mass spectrometer method to detect and separate the impurities in synthesized triethylboron. They are identified as CH 3 CH 2 OCH 2 CH 3 , (CH 3 CH 2 ) 3 B, (CH 3 CH 2 O) 3 B, CH 3 CH 2 CH 2 CH 2 B(CH 3 CH 2 ) 2 and (CH 3 CH 2 ) 3 O 3 B 3 . Further, optimized GC conditions are demonstrated to quantify the synthesized triethylboron accurately and determine its purity. The purity of triethylboron is 96.39 % via a normalization method with high accuracy (RSD=0.05 %). The optimized GC conditions were as follows: a hydrogen flame ionization detector, nitrogen as carrier gas whose pathway was installed with a water trap and an oxygen trap, an HP‐5 capillary column (30 m×0.32 mm×0.25 μm) with the column temperature of 60 °C, an inlet temperature of 120 °C, the detector temperature of 150 °C, and an injection volume of 0.6 μL. This work demonstrates a simple and precise method to analyze the synthesized triethylboron and its impurities.