G. Stangl et R. Niessner, MICELLAR EXTRACTION - A NEW STEP FOR ENRICHMENT IN THE ANALYSIS OF NAPROPAMIDE, International journal of environmental analytical chemistry, 58(1-4), 1995, pp. 15-22
The determination of pesticides at trace levels demands an enrichment
step due to the insufficient detection limits of most analytical techn
iques. Aim of this work is the application of the micellar extraction
for the preconcentration of napropamide from ultrapure water and natur
al samples. This surfactant-mediated phase separation uses Genapol X 8
0 and Genapol X 150 as examples of nonionic surfactants. Combined with
the fluorescent detection of the herbicide within the micellar phase,
it was possible to achieve detection limits below 0.2 mu g/l. The var
ious effects like surfactant concentration and addition of salt on the
enrichment has been studied. The results demonstrate the usefulness o
f the cloud point extraction system to extract and preconcentrate napr
opamide without use of any toxic and expensive organic solvent.