Evaporative concentration system for trace organic analysis

Ibrahim, E.; Suffet, I. H.; Sakla, Alfy Badie

doi:10.1021/ac00144a019

Cited by 14 publications

(4 citation statements)

References 34 publications

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“…The SDE extract of approximately 45–50 mL was further concentrated to 100 μL. The final concentration method used was the evaporative concentration system (EVACS), 19 followed by nitrogen blow‐down to a final volume of 100 μL. The SDE method, followed by the EVACS step, 19 concentrates compounds 20,000 times (2 L of water to 100 μL of dichloromethane).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The final concentration method used was the evaporative concentration system (EVACS), 19 followed by nitrogen blow‐down to a final volume of 100 μL. The SDE method, followed by the EVACS step, 19 concentrates compounds 20,000 times (2 L of water to 100 μL of dichloromethane). The recoveries obtained for the organoleptic compounds MIB and geosmin were 34.1 and 47.9 percent, respectively.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Sensory GC analysis of decaying vegetation and septic odors

Khiari¹,

Barrett²,

Suffet³

1997

Journal AWWA

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GC–MS is combined with sensory GC analysis to identify chemicals responsible for decaying vegetation and septic odors in drinking water supplies. A study was undertaken to identify the chemicals responsible for septic and decaying vegetation odors, not only in odor reference standards but also in natural waters. Two complementary extraction methods—closed‐loop stripping analysis and simultaneous distillation extraction—were used. Chemical identification was performed by gas chromatography (GC) with mass spectrometry, and sensory identification was accomplished by flavor profile analysis and sensory GC. Dimethyl disulfide, dimethyl trisulfide, and 2‐isobutyl‐3‐methoxypyrazine were the principal contributors to decaying vegetation odors, whereas dimethyl trisulfide and indole were strongly associated with septic odors. In addition, the study confirmed the presence of these chemicals as well as 2‐isopropyl‐3‐methoxypyrazine (associated with decaying vegetation) in water supplies.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Sensory GC analysis of decaying vegetation and septic odors

Khiari¹,

Barrett²,

Suffet³

1997

Journal AWWA

View full text Add to dashboard Cite

show abstract

“…Large sample volumes may be evaporated using a rotary evaporator [99,100], Kuderna-Danish evaporative concentrator, Figure 8.6(C), automated evaporative concentrator (EVACS), Figure 8.6(D) [101], or the gas blow-down method. This dilution of the sample is often too great for direct determination without a preconcentration step.…”

Section: Solvent Reduction Methodsmentioning

confidence: 99%

Sample Preparation for Chromatographic Analysis

Poole

1991

Chromatography Today

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“…= 0.32 cm) rolled around a 10.2 cm plastic pipe, where the liquid-liquid extraction occurs. The mixture is continually pumped to a phase separation chamber where the water is drained off and the solvent is directed to an automated Kuderna-Danish EVACS-type continuous solvent evaporator system [38]. EVACS solvent evaporators use a level sensor to balance the amount of solvent entering the system and being recycled.…”

Section: On-line Continuous Liquid-liquid Extraction (O-clle)mentioning

confidence: 99%