Simultaneous Determination of Carbaryl and 1-Naphthol by First-Derivative Synchronous Non-Protected Room Temperature Phosphorescence

Abstract

The applicability of non-protected room temperature phosphorescence (NP-RTP) in real samples was demonstrated in the present work. In this methodology, only two reagents, potassium iodide and sodium sulfite, were used to obtain phosphorescent signals. Overlapping of the phosphorescence spectra was resolved by using first-derivative synchronous phosphorimetry. The synchronous first-derivative spectra of carbaryl and 1-naphthol in the mixture were completely separated by changing the synchronous wavelength interval; with 240 nm the first-derivative spectra of carbaryl were recorded, while with 200 nm those of 1-naphthol appeared. The intensities in the spectra were proportional to the concentration of carbaryl and 1-naphthol. The calibration graphs were linear up to at least 1.1 ¥ 10 -5 mol L -1 for carbaryl and 1.3 ¥ 10 -5 mol L -1 for 1-naphthol, and the correlation coefficients were 0.9971 and 0.9932, respectively. Carbaryl and 1-naphthol were successfully determined by the proposed method in a hydrolyzed sample of a commercial formulation.

Luminescence methods for study and determination of pollutants in the environment

“…Since a large number of pesticides displayed relatively strong phosphorescence, several RTP methods have been applied to the environmental analysis of pesticides [99][100][101][102][103][104][105][106]. Segura et al [99] optimized a ME-RTP method in a dichloromethane/1-pentanol/SDS microemulsion to determine the insecticide carbaryl in real soil samples.…”

“…Spiked irrigation water samples taken near agricultural fields gave mean percentage recoveries of 95.7 % [101]. More recently, Machicote and Bruzzone [102] determined simultaneously carbaryl and its degradation product, 1-naphtol, by 1 st derivative synchronous non-protected RTP in the presence of potassium iodide and sodium sulfite, while Alvarez-Diaz et al [103] used halogenated molecularly imprinted polymers (MIP) for the selective determination of carbaryl by RTP. The later RTP optosensing system demonstrated high selectivity for carbaryl even in the presence of other luminophores that could be unspecifically adsorbed onto the MIP surface.…”

A Series of Novel Organically Templated Germanium Antimony Sulfides

“…There are many conventional analytical techniques available for the detection of bisulfite such as spectrofluorometry,4 spectrophotometry,5 gas‐diffusion flow injection analysis,3b, 6 phosphorimetry,7 chromatography,8 electrochemical methods,9 enzymatic techniques,10 chemiluminescence (CL) measurements,11 capillary electrophoresis,12 sulfite biosensors,13 flow injection analysis,14 and ion chromatography with indirect UV detection 15. However, conventional methods for bisulfite analyses usually require troublesome sample pretreatment and reagent preparation, and are either time‐consuming or require complicated instruments.…”