ISSN:
1612-1112
Keywords:
Gas chromatography
;
Estuarine waters
;
Solid-phase extraction
;
Triazines, alachlor, metolachlor
;
Nitrogen phosphorus detection
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary The stability of atrazine, simazine, alachlor, metolachlor, and deethylatrazine on C18 Empore disks has been determined. Estuarine water (100 mL) spiked at 3 μg L−1 with the target pesticide mixture was preconcentrated on the disks; the disks were then stored at −20°C, 4°C, and at room temperature for periods up to three months and were analyzed by gas chromatography with nitrogen-phosphorus detection. Complete recovery was observed after storage at −20°C throughout the period of the study. Losses up to maximum of 10% were observed after storage at 4°C. Higher losses (up to 24% for alachlor) occurred only at room temperature; the coefficient of variation for these determinations (8–11%) was also higher than that for the others (3–5%). The stability of the pesticides was dependent on the water matrix, on storage temperature, and on properties such as vapor pressure and water solubility.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02271058
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