The New Methods For Determination Of Phenol And Hydroquinone In Environmental Water Samples

Chapter 1In order to establish a new method for the determination of trace Phenol by catalytic resonance light scattering (RLS) method with surfactant as the sensitizer, a new reaction system of C₆H₅OH-H₂SO₄-KBrO₃-XO-CTMAB was selected. The properties of the RLS spectra ; the affecting factors and the optimum conditions of the reactions in the system were investigated and the mechanism of reaction in the system was given. The new method based on the linear relationship of the decreasement of RLS(â–³I_RLS=I₀-I)to the concentration of Phenol in solution was established in the system.The results showed that there was a evident catalytic effect of Phenol on the oxidation reaction of xylenol orange by potassium bromate in sulphuric acid medium. The system appeared the maximum RLS intensity at 504nm. The decreased intensity of RLS was directly proportional to the concentration of Phenol ranging from1.61×10^-2～1.36μg/mL with the detection limit of 4.87×10^-3μg/mL. This method was quick and simple with high sensitivity and good selectivity. The proposed method succeeded in the determination of trace Phenol in water samples of environment, and the relative standard deviation was less than 1.39% and the recoveries range were 95.6%～101.7%.Chapter 2A new reaction system of C₆H₅OH -KBrO₃-ADR-H₂SO₄ for the determination of trace Phenol was developed by inhibitory resonance fluorescence method. The properties of the resonance fluorescence spectra of the system were traversed. The affecting factors on the strength of resonance fluorescence including acidity, dosage, temperature, reaction time, coexisting ions etc., and the optimum conditions of the reaction in the system were investigated.In the reaction system, there was a evident inhibitory effect of Phenol on the oxidation reaction of acridine red by potassium bromate in sulphuric acid medium. The maximum resonance fluorescence peak located at 538nm. The reducement of quenching of resonance fluorescence was proporitional to the concentration of Phenol in the range of 8.58×10^-4～1.00μg/mL, and the detection limit was 2.60×10^-4μg/mL. The relative standard deviation was less than 1.67% and the recovery rate range were 95.5%～102.5%. The proposed method can be operated conveniently with high sensitivity and good selectivity. It was applied to the determination of trace Phenol of water samples with satisfactory results.A new reaction system of C₆H₄(OH)₂-KBrO₃-PY-H₂SO₄ for determing Hydroquinone was developed by catalytic resonance fluorescence method. The properties of the resonance fluorescence spectra of this system were studied. The affecting factors on the strength of resonance fluorescence, including acidity, dosage, temperature, reaction time, coexisting ions etc. were tested, and the optimum conditions of the reactions in this system were investigated.In the reaction system, there was a evident catalytic effect of Hydroquinone on the oxidation reaction of Pyronine Y by potassium bromate in sulphuric acid medium. The maximum resonance fluorescence peak located at 556nm. The decreasement of the resonance fluorescence was linear to the concentration of Hydroquinone in the range of 4.42×10^-3～1.60μg/mL with the detection limit of 1.46×10^-3μg/mL. This method can be operated conveniently with high sensitivity and good selectivity. When the proposed method was used to determine trace Hydroquinone in water samples, satisfactory results were obtained and the relative standard deviation was less than 2.64% and the recoveries range were 102.5%～104.0%.Chapter 3A catalytic kinetic spectrophotometry method was proposed for the determination of trace Phenol with the new reaction system of C₆H₅OH-KBrO₃-AR-H₂SO₄. The properties of the absorption spectrum of this system were studied. The affecting factors on the absorbance of the reaction of the system were investigated. The new method based on the linear relationship of the absorbance㏒(A0/A) to the concentration of Phenol was established .In sulphuric acid medium, there was a evident catalytic effect of Phenol on the oxidation reaction of arizarin red by potassium bromate. The maximum absorption peak located at 420nm. The absorbance㏒(A0/A) showed good linear relationship with the concentration of Phenol in the range of 0.020～0.200μg/mL with the detection limit was 1.45×10^-2μg/mL. The proposed method was sensitive and simple applied in the detection of trace Phenol of water samples in environment. The relative standard deviation was less than1.88% and the recovery rate range 102.0%～104.0%.