Simple determination of the herbicide napropamide in water and soil samples by room temperature phosphorescence

Abstract

A new, simple, rapid and selective phosphorimetric method for determining napropamide is proposed which demonstrates the applicability of heavy-atom-induced room-temperature phosphorescence for analyzing pesticides in real samples. The phosphorescence signals are a consequence of intermolecular protection and are found exclusively with analytes in the presence of heavy atom salts. Sodium sulfite was used as an oxygen scavenger to minimize room-temperature phosphorescence quenching. The determination was performed in 1 M potassium iodide and 6 mM sodium sulfite at 20 degrees C. The phosphorescence intensity was measured at 520 nm with excitation at 290 nm. Phosphorescence was easily developed, with a linear relation to concentration between 3.2 and 600.0 ng ml(-1) and a detection limit of 3.2 ng ml(-1). The method has been successfully applied to the analysis of napropamide in water and soil samples and an exhaustive interference study was also carried out to display the selectivity of the proposed method.

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.…”

“…The method was applicable on a LDR of 50-600 ng mL -1 , and a LOD of 16 ng mL -1 was obtained. Napropamide was also determined by HAI-RTP, a simple and rapid method, performed in the presence of heavy atom salt (1 M KI ) and of sodium sulfite (6 mM) used as an oxygen scavenger [105]. This method led to a LDR of 3.2-600 ng mL -1 and a LOD of 3.2 ng mL -1 , and was successfully applied to the analysis of napropamide in water and soil samples.…”

Review of Fluorescence Spectroscopy in Environmental Quality Applications

“…They are also of higher sensitivity (10–1000 times) compared to diode array UV detectors. A tremendous number of publications are dedicated to the determination of pollutants such as polycyclic aromatic hydrocarbons (PAHs) in water [ 42 , 43 , 44 ], in soils [ 45 , 46 ], in sediments [ 47 , 48 ], in pesticides in water [ 49 , 50 ], in soil [ 51 , 52 ], in pharmaceuticals in water [ 53 , 54 ], in soils [ 55 , 56 ], in sediments [ 57 , 58 ] and in metals in water [ 59 , 60 ] by chromatographic techniques coupled with fluorescence detectors. In all publications, a preconcentration of the samples is required, as the pollutants exist in very low concentrations.…”

Development of a Photoinduced Chemiluminescent Method for the Determination of the Herbicide Quinmerac in Water

“…Therefore, sensitive analytical methods are necessary for the determination of the residue levels. 4 Quinmerac is included in the list of “Active substances authorized for incorporation in plant protection products; only for uses as herbicide” by the European Union. 5 However, there have been very few published studies devoted to the development of new analytical procedures for its determination, and these studies have all used multi-residue methods.…”