Determination of submicrogram-per-liter concentrations of caffeine in surface water and groundwater samples by solid-phase extraction and liquid chromatography
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Abstract
A method for determining submicrogram-per-liter concentrations of caffeine in surface water and groundwater samples has been developed. Caffeine is extracted from a 1 L water sample with a 0.5 g graphitized carbon-based solid-phase cartridge, eluted with methylene chloride-methanol (80 + 20, v/v), and analyzed by liquid chromatography with photodiode-array detection. The single-operator method detection limit for organic-free water samples was 0.02 μg/L. Mean recoveries and relative standard deviations were 93 ± 13% for organic- free water samples fortified at 0.04 μg/L and 84 ± 4% for laboratory reagent spikes fortified at 0.5 μg/L. Environmental concentrations of caffeine ranged from 0.003 to 1.44 μg/L in surface water samples and from 0.01 to 0.08 μg/L in groundwater samples.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Determination of submicrogram-per-liter concentrations of caffeine in surface water and groundwater samples by solid-phase extraction and liquid chromatography |
| Series title | Journal of AOAC International |
| DOI | 10.1093/jaoac/82.1.161 |
| Volume | 82 |
| Issue | 1 |
| Year Published | 1999 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | National Water Quality Laboratory |
| Description | 6 p. |
| First page | 161 |
| Last page | 166 |
| Google Analytic Metrics | Metrics page |