Analysis of Simazine and Thiobencarb by GC-MS method using nitrogen carrier gas
MSTips No. 385
Helium (He), which is widely used as a carrier gas for GC, may have problems such as temporary price increase or unstable supply due to various reasons. As an alternative gas, hydrogen (H₂) has a wide linear velocity range for optimal separation and is suitable as a carrier gas for GC, but must be handled with care due to its influence on the mass spectrum pattern and the risk of being flammable and explosive. On the other hand, nitrogen (N₂) is relatively easy to introduce into GC-MS when safety is important, but there is concern about a sensitivity loss of about 1/10 due to decreased ionization efficiency. In this report, simazine and thiobencarb, which are pesticides subject to environmental standards related to water pollution, were measured using N₂ carrier gas, and the difference in sensitivity from He, linearity of the calibration curve, and reproducibility during continuous measurement were confirmed.