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Method for detecting volatile phenol content of water

A detection method and technology for volatilizing phenol, which are applied in the measurement of color/spectral properties, analysis by chemical reaction of materials, and material analysis by observing the effect on chemical indicators, which can solve the complex extraction operation procedures and distillation time. It can simplify the operation procedures, improve the analysis speed, and reduce the detection limit.

Inactive Publication Date: 2015-02-25
SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the reagents used are unstable, and when the hydroxyl group has substituents at the para-position, some substituents prevent the color reaction
When the sample contains p-phenol, the analysis result will be low
In addition, the distillation time in the analysis process is very long, and the extraction procedures are complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) The method for drawing the standard curve regression equation is to add 0, 0.50, 1.00, 3.00, 5.00, and 10 to 8 50ml volumetric flasks that have previously been added with 5.0ml of sodium hydroxide solution with a concentration of 0.500mol / L. .00, 20.00, 30.00ml of standard phenol solution with a concentration of 10 μg / ml, adjust to the scale with distilled water, measure the absorbance of each solution according to the sample distillate method, carry out linear regression to the obtained data, and obtain the linear regression equation of the standard curve: Y = 0.llX + 0.00l5.

[0019] (2) Accurately pipette 100ml of water sample into the all-glass distiller, add a drop of methyl orange indicator, adjust it to orange red or red with phosphoric acid solution, inject 2ml of copper sulfate solution, heat and distill, and use 5.00ml of the previously added Collect the distillate in a 100ml volumetric flask of 1.00mol / L sodium hydroxide solution, stop the distillation wh...

Embodiment 2

[0020] Embodiment two: the mensuration of actual water sample

[0021] Detected by the detection method of the present invention, the detection results are shown in Table-1.

[0022] Table-l test results

[0023] .

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Abstract

The invention discloses a method for detecting volatile phenol content of water and belongs to the field of environment sample detection methods. The method comprises the following steps of taking a water sample, adding a methyl orange indicator into the water sample, adjusting the water sample to orange red or red color solution by a phosphoric acid solution, pouring a copper sulphate solution into the water sample, carrying out heating distillation, collecting the distillate by a volumetric flask with a sodium hydroxide solution, washing the wall of a condenser tube by desalinized water, adding a washing liquid into the same volumetric flask, carrying out dilution by desalinized water to obtain a solution having a desired volume, pouring the distillate into a colorimetric pipe, adjusting the pH of the solution to less than 7 by a hydrochloric acid solution, determining distillate absorbance by the obtained acidic solution as a reference solution and calculating phenol content corresponding to the absorbance according to a standard curve regression equation. The method has a phenol recovery rate more than 94.0%, lowest detection limit of 0.1mg / L, standard deviation of 0.05 and a variation coefficient of 3%, and has the characteristics of high accuracy, high repeatability, operation simpleness and low detection limit.

Description

technical field [0001] The invention relates to a method for detecting volatile phenol content in water, belonging to the field of detection methods for environmental samples. Background technique [0002] Phenols contained in industrial wastewater not only increase the BOD value, but also its toxicity will hinder the survival and reproduction of aquatic organisms and endanger agricultural production. Volatile phenols contained in drinking water sources are carcinogens that seriously endanger human health. As the water quality of the Yangtze River is polluted by industrial wastewater, the content of volatile phenols in daily life greatly exceeds the national standard for drinking water. The volatile phenol content must also be strictly monitored in industrial wastewater from power plants. [0003] The determination of trace volatile phenols in water in general laboratories adopts the 4-aminoaminotipine colorimetric method. The reaction produces a red ampicillin dye, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/79
Inventor 陆强
Owner SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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