Simultaneous extraction of six pesticides using a dual-column extraction procedure.
1994
Watts D.W. | Bogus E.R. | Hall J.K. | Mumma R.O.
A method was developed that allowed for the simultaneous extraction of six pesticides (three chloro-s-triazines, a substituted amide, an organic phosphate, and a benzoic acid derivative) from either soil or water samples. This method utilizes two types of solid-phase extraction columns, one reverse phase, and one anion exchange column, connected in series to extract all six compounds from a single sample. After separate elution of the two columns, high pressure liquid chromatography was employed to analyze the benzoic acid derivative utilizing a C-18 column and paired ion techniques with a detection limit of 6 micrograms L-1. A gas chromatograph, equipped with a N-P detector, was used to analyze the remaining five compounds. The detectable limit for the chloro-s-triazines was 3 micrograms L-1 while the detection limit of the substituted amide was 6 micrograms L-1.
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