Development of thermochemically induced fluorescence (TIF) method for the determination of insecticide deltamethrin in Senegalese natural waters.
A simple and sensitive thermochemically induced fluorescence (TIF)
method was developed to determine deltamethrin, an insecticide
which has toxic effects on human beings and animals. After optimisation at different pH, temperature was increased from 25 to 50°
C. TIF method is based on the thermolysis transformation of naturally non-fluorescent pesticides into a fluorescent thermoproduct.
The thermolysis kinetics reaction investigated in water at optimal
pH 12 and after 4 minutes heating at 40°C made it possible to
obtain a low mean half-life time (t1/2 = 1.41 ± 0.06 min), which
shows that deltamethrin degrades very rapidly due to heat. The
obtained calibration curve gave correlation coefficients close to
unity. The limit of detection (LOD = 4.4 ng mL?1) and quantification
(LOQ = 15 ng mL?1) values were very low, showing the high
sensitivity of the TIF method. TIF method was applied to determination of deltamethrin residues in tap and well waters by standard
addition procedure, with satisfactory recovery values between
107.6 and 111.4%. The relative standard deviation (RSD) value of
the measured concentrations in spiked water samples was less than
6%, which demonstrated good reproducibility of the TIF method.
Auteur(s) : Diéry Diouf, Diène Diégane Thiaré, Diégane Sarr, Pape Abdoulaye Diaw, Khémesse Kital, Olivier Maurice Aly Mbaye, Sérigne Omar Sarr, Mame Diabou Gaye-S
Année de publication : 2020
Revue : International Journal of Environmental Analytical Chemistry
Type : Article
Mise en ligne par : COLY Atanasse