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Cloud Point Extraction-spectrophotometric Determination of Malachite Green and Other Hazardous Substances in Environmental Water Samples Using Partial Least Squares Methods

Author: AnLin
Tutor: DengJian
School: Nanhua University
Course: Analytical Chemistry
Keywords: Cloud point extraction Partial Least Squares Spectrophotometry Malachite green Crystal violet Vanadium Cobalt Copper Uranium Thorium
CLC: X832
Type: Master's thesis
Year: 2010
Downloads: 181
Quote: 0
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Abstract


The cloud point extraction in recent years, the emergence of a new liquid - liquid microextraction technique, it does not use volatile organic solvents, does not affect the environment. Micelle aqueous solution of a neutral surfactant solubility and cloud point phenomenon basis, by changing the experimental parameters lead to phase separation, the separation of the hydrophobic substance and a hydrophilic substance. The cloud point extraction with high extraction efficiency, enrichment factor is large, easy to operate, safe, economical and easy to realize the advantages of the combination with the concern and attention of more and more people, and metal ions as a means of separation and enrichment separation and enrichment, morphological analysis, has been widely used in the separation and purification of biological macromolecules, separation and determination of small organic molecules. In this paper, a detailed examination of the phase behavior of surfactant micelle solution based on cloud point extraction method for the separation and enrichment means, partial least squares spectrophotometric determination of toxic and harmful substances in the water environment. The research topics include: (1) cloud point extraction - Partial Least Squares Simultaneous spectrophotometric determination of malachite green and crystal violet in water samples a detailed study of cloud point extraction with non-ionic surfactant Triton X-114 water samples malachite green and crystal violet suitable conditions, such as pH, the amount of surfactant, equilibration time and influence of coexisting ions, cloud point extraction - Partial Least Squares Simultaneous spectrophotometric determination of malachite green and crystal water samples a purple new method. Malachite green and crystal violet maximum absorption wavelength of 624 nm and 579 nm, the linear range of the standard curve are 9.9-800 ng mL-1 and 16-1000 ng mL-1, the detection limit is 2.9 ng mL? and 4.8 ng mL? forecast RMSE are 0.0197 and 0.0325. The method has been successfully applied to the determination of trace amounts of malachite green and crystal violet in water samples, recovery 92.45-102.5%. (2) The cloud point extraction - Partial Least Squares Simultaneous spectrophotometric determination of vanadium in water samples, cobalt and copper, a detailed study of cloud point extraction with non-ionic surfactant Triton X-114 in water samples vanadium (V), cobalt (II) and copper (II) suitable conditions, such as pH, the amount of chelating agent, the amount of surfactant, equilibration time and the influence of coexisting ions, cloud point extraction - Partial Least Squares Simultaneous spectrophotometric determination of water samples The new method of vanadium, cobalt and copper. Vanadium, cobalt and copper chelate maximum absorption wavelength to 603 nm, 588 nm and 563 nm, the linear range of the standard curve is 7-300 ng mL-1 ,3-100 ng mL-1 and 15-700 ng mL-1, the detection limit is 2.2 ng mL? 1, 1.0 ng mL? 1 and 4.5 ng mL? the forecast RMSE 0.0034,0.0016 and 0.0181, respectively. The method has been successfully applied to the determination of the water samples vanadium, cobalt and copper recovery 96.75-104.7%. (3) The cloud point extraction - Partial Least Squares Simultaneous spectrophotometric determination of uranium and thorium in the water samples studied in detail to the non-ionic surfactant Triton X-114 cloud point extraction of uranium (VI) and thorium (IV) suitable conditions, such as pH, the amount of chelating agent, the amount of surfactant, equilibration time and influence of coexisting ions, cloud point extraction - Partial Least Squares Simultaneous spectrophotometric determination of a new method of uranium and thorium in water samples. Uranium and thorium chelates maximum absorption wavelength of 653 nm and 662 nm, the linear range of the standard curve are 0.16-5.0μg mL-1 and 0.25-3.5μg mL-1, the detection limit is 0.05μg mL-1 and 0.08μg mL-1, the forecast RMSE are 0.0435 and 0.0789. The method was successfully applied to the determination of uranium and thorium in water samples, the recovery rate was 90.70 -106.4%.

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CLC: > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Environmental monitoring > Water quality monitoring
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