Development of a closed loop stripping analysis using solid-phase microextraction to analyze geosmin and MIB in drinking water

2006 ◽  
Vol 6 (3) ◽  
pp. 167-174 ◽  
Author(s):  
I.H. (Mel) Suffet ◽  
A. Bruchet ◽  
C.C. Young
Keyword(s):  
Drinking Water ◽  
Solid Phase Microextraction ◽  
Closed Loop ◽  
Solid Phase ◽  
Statistical Design ◽  
Stripping Analysis ◽  
Taste And Odor ◽  
Order Of Magnitude ◽  
The Individual ◽  
Concentration Levels

A novel analytical method, solid phase microextraction (SPME) coupled with closed loop stripping analysis (CLSA), was introduced for the analysis of MIB and geosmin at nanogram per liter concentration levels. The optimum CLSA/SPME analysis conditions of 65 °C, 60-minute extraction time, and 0.5 M sodium sulfate were determined from a statistical design. The individual Kfw of MIB and geosmin from CLSA/SPME method was 4.21 and 4.85, and resulted an order of magnitude greater than the Kfw obtained from direct SPME method. A detection limit of 10 ng/L of MIB and geosmin was achieved by GC-MS with CLSA/SPME with a polyacrylate phase. Overall, CLSA/SPME provides a fast, solvent-free, and less labor intensive method compared to the standard CLSA. The CLSA/SPME method is a valuable alternative method for the analysis of taste-and-odor causing compounds in drinking water.

Production of 2-Methyliso-Borneol by Two Benthic Cyanophyta

1983 ◽  
Vol 15 (6-7) ◽  
pp. 211-220 ◽  
Author(s):  
G Izaguirre ◽  
C J Hwang ◽  
S W Krasner ◽  
M J McGuire
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Drinking Water ◽  
Closed Loop ◽  
Water Supply Systems ◽  
Source Water ◽  
Analysis Method ◽  
Sediment Samples ◽  
Taste And Odor ◽  
Supply Systems

Two Oscillatoria strains have been isolated from three different water supply systems in California that have experienced taste and odor problems in their drinking water. The algae were obtained from sediment samples and rock scrapings from source-water reservoirs. Unialgal cultures, free of actinomycetes, were purged using the closed-loop stripping analysis method, and the resulting extracts were analyzed by gas chromatography and mass spectrometry. The organisms, Oscillatoriacurviceps and O.tenuis variant levis Gardner, yielded 2-methylisoborneol (MIB) at 60–150 µg/l. In both instances, MIB had previously been identified in the sediment samples from which the organisms were isolated. O.curviceps was implicated in a taste and odor episode involving MIB in a major reservoir during two consecutive summers.

scholarly journals Measurement of Drinking Water Contaminants by Solid Phase Microextraction Initially Quantified in Source Water Samples by the USGS

2008 ◽  
Vol 42 (8) ◽  
pp. 2976-2981 ◽  
Author(s):  
Robert Stiles ◽  
Ill Yang ◽  
Robert Lee Lippincott ◽  
Eileen Murphy ◽  
Brian Buckley
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Source Water ◽  
Water Contaminants

Sensory Gas Chromatography for Evaluation of Taste and Odor Events in Drinking Water

1992 ◽  
Vol 25 (2) ◽  
pp. 97-104 ◽  
Author(s):  
D. Khiari ◽  
L. Brenner ◽  
G. A. Burlingame ◽  
I. H. Suffet
Keyword(s):  
Gas Chromatography ◽  
Drinking Water ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Sensory Panel ◽  
Delaware River ◽  
Gc Analysis ◽  
Flame Ionization ◽  
Taste And Odor ◽  
The Individual

A sensory gas chromatography (sensory GC) procedure with appropriate quality assurance steps was developed to evaluate ng/l concentrations of odorous chemicals in drinking water. Closed loop stripping analysis was used to concentrate the chemicals in the water samples. Sensory GC analysis was completed by smelling the effluent at the exit port of an on-column injector capillary GC system. An identical and parallel GC flame ionization detector system was used to monitor the sensory gas chromatograms. The sensory GC analysis is important because it can detect some of the individual components of the odor that a sensory panel determines on a water sample. The relationship between sensory panel response and the sensory GC procedure were investigated near threshold odor concentration levels and the data shows that sensory GC does not always correlate with sensory panel evaluations. This can be caused by the concentrations differences of the chemicals in the mixture and synergistic and antagonistic effects. Two taste and odor events reported at the Baxter Water Treatment Plant of the city of Philadelphia on the Delaware river were investigated. The events were first a metallic aftertaste accompanied by a burnt rubber odor and second a cucumber odor in the drinking water. The cases studied illustrate the use of FPA, sensory GC and GC/MS to understand the chemical nature of the odors present in the samples.

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