USING A WATER-GLYCEROL MATRIX IN SECONDARY-ION MASS-SPECTROMETRY FOR DETERMINING ORGANIC-COMPOUNDS

A method of secondary-emission mass-spectrometric analysis of nonvolat ile organic compounds with the use of a mixed water-glycerol matrix is proposed. A drop of matrix solution containing an admixture of the te st material is cooled to the temperature of liquid nitrogen and used a s the target. It is shown that the yield of protonated molecular ions from amino acids is maximum for a matrix containing 80% water and 20% glycerol. The yield of quasimolecular ions increases on adding 1% nitr ic acid. Using a water-glycerol matrix increases the yields of protona ted molecular ions from various amino acids (DL-threonine, DL-arginine , L-phenylalanine, and glycylglycine) by 10-20 times compared to those attained with a pure glycerol matrix.