Fenton degradation of Cartap hydrochloride: identification of the main intermediates and the degradation pathway

Abstract

The advanced oxidation of Cartap hydrochloride (Cartap) promoted by the Fenton system in an aqueous medium was investigated. Based on total organic carbon, chemical oxygen demand and high-performance liquid chromatography, the oxidation of Cartap is quite efficient by the Fenton system. Its long chain is easily destroyed, but the reaction does not proceed to complete mineralization. Ion chromatography detection indicated the formation of acetic acid, propionic acid, formic acid, nitrous acid and sulfuric acid in the reaction mixtures. Further evidence of nitrogen monoxide and sulfur dioxide formation was obtained by using a flue gas analyzer. Monitoring by gas chromatograph-mass spectrometer demonstrated the formation of oxalic acid, ethanol, carbon dioxide, and L-alanine ethylamide. Based on these experimental results, plausible degradation pathways for Cartap mineralization in an aqueous medium by the Fenton system are proposed.

Degradation of pesticide Cartap in Padan 95SP by combined advanced oxidation and electro-Fenton process

“…11, Cartap (t r = 3.1 min) is decomposed almost completely within the initial 5 min of the electro-Fenton process. Accordingly, the efficiency of the process applied here is much higher than that of the original Fenton process examined earlier [5]. New peaks appear and then fade with reaction time.…”

“…Degradation pathways for Cartap with the original Fenton process have been proposed elsewhere [5]. Figure 11 depicts HPLC chromatograms recorded with samples taken at various time intervals during the degradation (120 min in total) of Cartap.…”

“…In the Mekong Delta (Vietnam), Cartap constitutes about 19% of the insecticide usage in rice and rice-fish farms [4]. In China, Japan, and Korea, it is also one of the most frequently used pesticides for pest control [5,6]. Excessive use of Cartap and its commercial preparations as well as of related compounds in tea production has been noted [7].…”

“…As another option, degradation of Cartap and other pollutants by a simple Fenton process has been examined elsewhere [5]. At optimized reaction conditions, 80% of the initial Cartap could be destroyed, but significant and stable concentrations of degradation products were noticed.…”

Rapid Colorimetric Detection of Cartap Residues by AgNP Sensor with Magnetic Molecularly Imprinted Microspheres as Recognition Elements

“…Aiming to reduce the risk of polluting the environment and to establish a safety standard of cartap, determining cartap content in food is of great importance. Various analytical methods have been used for detecting cartap, such as spectrophotometry [ 3 , 5 , 6 ], thin-layer chromatography [ 7 ], gas chromatography [ 8 ], high-performance liquid chromatography [ 9 , 10 ], gas chromatography-mass spectrometry [ 11 , 12 , 13 ], liquid chromatography-tandem mass spectrometry [ 14 ]. These methods are successfully applied to qualitatively and quantitatively determine cartap.…”