Premium
Determination of 2‐methylisoborneol and geosmin in aqueous samples by static headspace‐gas chromatography‐mass spectrometry with ramped inlet pressure
Author(s) -
Nakamura Sadao,
Sakui Norihiro,
Tsuji Akira,
Daishima Shigeki
Publication year - 2005
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200401944
Subject(s) - geosmin , chemistry , chromatography , inlet , mass spectrometry , analytical chemistry (journal) , volume (thermodynamics) , gas chromatography , aqueous solution , detection limit , volumetric flow rate , odor , mechanical engineering , physics , organic chemistry , quantum mechanics , engineering
A method for determining the earthy and musty odors 2‐methylisoborneol (2‐MIB) and geosmin in drinking water using static headspace‐GC‐MS is described. To achieve lower detection limits, split ratio was optimized with ramped inlet pressure for large headspace sampling volume. The ramped inlet pressure, which held higher pressure (higher column flow rate) only during injection, allowed us to inject 3‐mL volume to GC with very low split ratio (2:1). Although sequential analysis with a stainless steel ion source often changed the mass spectrum of 2‐MIB, this spectral change was eliminated by using an inert ion source with a 6 mm drawout plate. The detection limits of this method were 0.36 and 0.14 ng/L, respectively, for 2‐MIB and geosmin. The repeatabilities ( n = 30) were 6.6 and 4.8%, respectively, at 1 ng/L for 2‐MIB and geosmin.