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Complete Determination of Acids, Bases, and Neutrals in Water Using Mixed-Mode Solid Phase Extraction for EPA Method 8270
Poster Presentation
Prepared by X. Wang1, T. August2, M. Telepchak3
1 - UCT, 2731 Bartram Road, Bristol, PA, 19007
2 - UCT, 2731 Bartram Road, Bristol, PA, 19007
3 - UCT, 2731 Bartram Road, Bristol, PA, 19007
Contact Information: xwang@unitedchem.com; 215-781-9255
ABSTRACT
An accurate, precise, and cost-effective method has been developed for EPA Method 8270 water analysis using mixed-mode solid phase extraction and GC/MS detection. Compared to liquid-liquid extraction which requires multiple extractions at two pH values and the consumption of a large amount of organic solvents, this newly developed method needs only one extraction at one pH. The overall average recovery and relative standard deviation was found to be 94.7% and 3.1% for 137 target analytes and 6 surrogates analyzed in this study. Method detection limits ranged within 0.26-3.08 ppb based on seven replicate extractions of 500 mL fortified reagent water samples. This innovative approach has also been applied to lake water samples with acceptable recoveries and relative percentage differences. High throughout can be achieved by extracting multiple samples simultaneously using SPE manifold with multiple positions.
(Related Session: Advances in Sample Preparation and Clean-up)
Poster Presentation
Prepared by X. Wang1, T. August2, M. Telepchak3
1 - UCT, 2731 Bartram Road, Bristol, PA, 19007
2 - UCT, 2731 Bartram Road, Bristol, PA, 19007
3 - UCT, 2731 Bartram Road, Bristol, PA, 19007
Contact Information: xwang@unitedchem.com; 215-781-9255
ABSTRACT
An accurate, precise, and cost-effective method has been developed for EPA Method 8270 water analysis using mixed-mode solid phase extraction and GC/MS detection. Compared to liquid-liquid extraction which requires multiple extractions at two pH values and the consumption of a large amount of organic solvents, this newly developed method needs only one extraction at one pH. The overall average recovery and relative standard deviation was found to be 94.7% and 3.1% for 137 target analytes and 6 surrogates analyzed in this study. Method detection limits ranged within 0.26-3.08 ppb based on seven replicate extractions of 500 mL fortified reagent water samples. This innovative approach has also been applied to lake water samples with acceptable recoveries and relative percentage differences. High throughout can be achieved by extracting multiple samples simultaneously using SPE manifold with multiple positions.
(Related Session: Advances in Sample Preparation and Clean-up)