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Abstract
A systematic study on the conditions affecting determination of chlorinated phenolics in water as acetate derivatives was made. Different reaction conditions (carbonate buffer composition, ionic strength, pH, acetic anhydride concentration and reaction time) were tested. As a result it was found that variation of acetylation conditions had little influence on the results. Acetylation could be done in a 0.1 M or less concentrated carbonate solution by adding 4% (v/v) of acetic anhydride and shaking. The reaction took place in a couple of minutes. When using elector capture detector for the determination, it was found best to use three‐point calibration as the linear area of the detector is narrow and a difference in concentration of a calibration solution and a sample may lead to a false quantification when using one‐point calibration. Some of the gas chromatographic conditions affected the responses of the compounds. Diminishing the make‐up gas flow raised the areas of chlorinated phenolics other than catechols that gained the largest areas at 50 ml/min in the system used. The best responses were achieved with the baseline maximum current (57 mA).
Notes
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