title: UV-vis spectrophotometric determination of trinitrotoluene (TNT) with trioctylmethylammonium chloride as ion pair assisted and disperser agent after dispersive liquid-liquid microextraction.
abstract: In the present study, a simple, fast and inexpensive method based on dispersive liquid-liquid microextraction (DLLME) prior to microvolume UV-vis spectrophotometry was developed for the preconcentration and determination of trinitrotoluene (TNT). The procedure is based on the color reaction of TNT in alkaline medium and extraction into CCl4 as an ion pair assisted by trioctylmethylammonium chloride, which also acts as a disperser agent. Experimental parameters affecting the DLLME method such as pH, concentration of sodium hydroxide, amount of trioctylmethylammonium chloride, type and volume of extraction solvent were investigated and optimized. Under the optimum conditions, the limit of detection (LOD) was 0.9ng/mL and the calibration curve was linear in the range of 3-200ng/mL. The relative standard deviation for 25 and 100ng/mL of TNT were 3.7% and 1.5% (n=6), respectively. The developed DLLME method was applied for the determination of TNT in different water and soil samples.
authors: Marine Science Research Institute, Khoramshahr University of Marine Science and Technology, Khoramshahr, Iran.
authors: Arash
authors: A
authors: Larki
authors: Department of Chemistry, Imam Hossein University, Tehran, Iran; Nano-Science Center, Imam Hossein University, Tehran, Iran. Electronic address: rahiminasrabadi@gmail.com.
authors: Mehdi Rahimi
authors: MR
authors: Nasrabadi
authors: Department of Chemistry, College of Science, Shahid Chamran University, Ahvaz, Iran.
authors: Nahid
authors: N
authors: Pourreza
mesh_terms: D053834:Explosive Agents / Q000032:analysis* / Q000737:chemistry; D057230:Limit of Detection; D059627:Liquid Phase Microextraction; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012987:Soil / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D014303:Trinitrotoluene / Q000032:analysis* / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D053834:Explosive Agents; D000644:Quaternary Ammonium Compounds; D012987:Soil; D012997:Solvents; D014867:Water; D014303:Trinitrotoluene; C037759:trioctylmethylammonium
keywords: Dispersive liquid–liquid microextraction; Microvolume spectrophotometry; Trinitrotoluene; Trioctylmethylammonium chloride