A rapid, economic, sensitive and reliable method for the determination of epichlorohydrin (ECH) in drinking water is presented. After extraction by methylene chloride, trace-level ECH was quickly concentrated with K-D concentrator. An Agilent 7890A GC System with an Agilent J&W DB-5ms Ultra Inert column were used for ECH analysis. The calibration curves were linear over the range of 0.08–1.60 ng with correlation coefficients greater than 0.9997. Recoveries of ECH at spiked levels of 1.0, and 5.0 µg/L were 104.7% and 107.0%, respectively. The RSD value for ECH reproducibility was lower than 2.21%. The detection limit was less than 0.07 µg/L, which is below the maximum residue limit (MRL) of 0.1 µg/L in European Union regulations for ECH in drinking water.
This document presents a method for the determination of epichlorohydrin (ECH) in drinking water using gas chromatography with a flame ionization detector (GC/FID). The method involves liquid-liquid extraction with methylene chloride followed by concentration using a K-D concentrator. The analysis is performed on an Agilent 7890A GC System equipped with an Agilent J&W DB-5ms Ultra Inert column.
The study demonstrates that the method achieves a detection limit of less than 0.07 pg/L, which is below the maximum residue limit of 0.1 pg/L set by European Union regulations. Recoveries for spiked samples were found to be between 104.7% and 107.0%, with a reproducibility RSD lower than 2.21%.
| Detection Limit | < 0.07 pg/L |
|---|---|
| Linear Range | 0.08-1.60 ng |
| Correlation Coefficient | > 0.9997 |
| Column Type | Agilent J&W DB-5ms Ultra Inert |
| Carrier Gas | Helium |
| Inlet Temperature | 250 °C |
| Oven Temperature Program | 30 °C (1 min) to 100 °C (2 min) |
| Detector Temperature | 260 °C |
The detection limit is less than 0.07 pg/L.
An Agilent J&W DB-5ms Ultra Inert column with dimensions 10 m x 0.18 mm x 0.36 µm is used.
The calibration curves are linear over the range of 0.08-1.60 ng.