title: Simultaneous spectrophotometric determination of trace amount of malachite green and crystal violet in water after cloud point extraction using partial least squares regression.
abstract: In this work, a new method has been proposed to simultaneously determine the trace amount of malachite green and crystal violet from aqueous solution by spectrophotometry after cloud point extraction (CPE) using partial least squares regression. The optimal extraction and operating conditions, such as pH, reagents concentration and effect of time and temperature, and so on, have been investigated using the non-ionic surfactant Triton X-114. The maximum absorption wavelength for malachite green and crystal violet is 624 and 579 nm, respectively; linearity is obeyed in the range of 9.9-800 and 16-1000 ng mL(-1) with detection limit of 2.9 and 4.8 ng mL(-1), and the root mean square error of prediction (RMSEP) are 0.0197 and 0.0343, respectively. The proposed method has been applied successfully to simultaneously determine the trace amount of malachite green and crystal violet in real matrix samples with the recoveries of 92.45-102.5%.
authors: School of Chemistry and Chemical Engineering, University of South China, Hengyang Hunan 421001, China.
authors: Lin
authors: L
authors: An
authors: Jian
authors: J
authors: Deng
authors: Liang
authors: L
authors: Zhou
authors: Hui
authors: H
authors: Li
authors: Fei
authors: F
authors: Chen
authors: Hui
authors: H
authors: Wang
authors: Yating
authors: Y
authors: Liu
mesh_terms: D002138:Calibration; D005840:Gentian Violet / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D016018:Least-Squares Analysis; D017830:Octoxynol; D011092:Polyethylene Glycols / Q000494:pharmacology; D012394:Rosaniline Dyes / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods*; D013501:Surface-Active Agents; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D007477:Ions; D012394:Rosaniline Dyes; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D014867:Water; C005095:malachite green; D011092:Polyethylene Glycols; D017830:Octoxynol; C010615:Nonidet P-40; D005840:Gentian Violet