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  • Positive- and negative-ion mass spectrometry and rapid clean-up of some carbamate pesticides.

Positive- and negative-ion mass spectrometry and rapid clean-up of some carbamate pesticides.

Forensic science international (1990-07-01)
O Suzuki, H Hattori, J Liu, H Seno, T Kumazawa
ABSTRACT

Positive-ion electron impact (PIEI), positive-ion chemical ionization (PICI) and negative-ion chemical ionization (NICI) mass spectra of 9 carbamate pesticides are presented. In the PIEI mode, the spectra showed small molecular peaks, intense or base peaks due to M - CH3NHCO + H and peaks at m/z 58 due to CH3NHCO. In the PICI mode, peaks due to M + H, M + C2H5, M - CH3NHCO + 2H, CH3NHCO(m/z 58) and M-28 appeared. The cations at m/z 58 found in both PIEI and PICI modes seem very useful for screening of a carbamate. In the NICI mode, the spectra showed peaks due to M - CH3NHCO and characteristic anions appearing at mass numbers higher than molecular ones, which were probably due to dimerization of [M - CH3NHCO]-followed by hydrogen attachment. Carbamates, which had been added to urine, plasma, whole blood, the liver, kidney and brain, could be rapidly isolated by use of Sep-Pak C18 cartridges with chloroform as an elution solvent. They could be detected by wide-bore capillary gas chromatography with a SPB-5 column, with satisfactory separation from impurities in their underivatized forms.

MATERIALS
Product Number
Brand
Product Description

Supelco
SPB®-5 Capillary GC Column, L × I.D. 50 m × 0.32 mm, df 5.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 60 m × 0.25 mm, df 0.25 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.32 mm, df 1.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 15 m × 0.32 mm, df 0.25 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 60 m × 0.32 mm, df 1.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 60 m × 0.53 mm, df 3.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.25 mm, df 0.25 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.53 mm, df 1.50 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 25 m × 0.32 mm, df 0.52 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 15 m × 0.53 mm, df 3.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 60 m × 0.32 mm, df 0.25 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 60 m × 0.53 mm, df 5.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.53 mm, df 1.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.53 mm, df 5.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.53 mm, df 0.50 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.53 mm, df 3.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.25 mm, df 1.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.32 mm, df 0.25 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 60 m × 0.25 mm, df 1.00 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 15 m × 0.53 mm, df 1.50 μm
Supelco
SPB®-5 Capillary GC Column, L × I.D. 30 m × 0.20 mm, df 0.20 μm