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Method used for measuring content of salicylaldoxime in water environment

A technology for salicylaldoxime and water determination, which is applied in measuring devices, instruments, scientific instruments and other directions to achieve the effects of easy control, high accuracy and good repeatability

Active Publication Date: 2017-05-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on salicylaldoxime alone at home and abroad, basically all of which are aimed at the

Method used

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  • Method used for measuring content of salicylaldoxime in water environment
  • Method used for measuring content of salicylaldoxime in water environment
  • Method used for measuring content of salicylaldoxime in water environment

Examples

Experimental program
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Effect test

Embodiment 1

[0034] For the analysis of salicylaldoxime in the sewage outfall wastewater of a mining area, the analysis steps include:

[0035] 1. Use GC-ECD to measure 0.01, 0.02, 0.1, 0.5, 1 μg mL respectively -1 Acetyl benzonitrile standard solution, the ratio k of the response peak area and its concentration to obtain acetyl benzonitrile is 0.9993;

[0036] 2. At room temperature, take the wastewater containing salicylaldoxime, add 1.25g Na 2 CO 3 , 0.12g NaCl, and dilute to 25mL. Add 1mL acetic anhydride (AA) and 5mL cyclohexane at the same time. After about five minutes, take the upper organic phase and add it to a 50mL centrifuge tube. Wash away the acetic anhydride in the organic phase with 8-10mL deionized water. After washing twice, Injection.

[0037] 3. The peak area of ​​the obtained derivatized product is compared with the curve of acetylbenzonitrile in step (1), and the concentration of salicylaldoxime in the water environment is calculated by using the external standard...

Embodiment 2

[0039] For the analysis of salicylaldoxime in the wastewater from the sewage outfall of the Xiangjiang River, the analysis steps include:

[0040] 1. Use GC-ECD to measure 0.01, 0.02, 0.1, 0.5, 1 μg mL respectively -1 Acetyl benzonitrile standard solution, the ratio k of the response peak area and its concentration to obtain acetyl benzonitrile is 0.9989;

[0041] 2. At room temperature, take the wastewater containing salicylaldoxime, add 1g Na 2 CO 3, 0.1g NaCl (m / v), dilute to 20mL. At the same time, add 0.8mL acetic anhydride (AA) and 4mL cyclohexane. After about five minutes, take the upper organic phase and add it to a 50mL centrifuge tube. Wash the acetic anhydride in the organic phase with 8-10mL deionized water. , sample injection.

[0042] 3. The peak area of ​​the obtained derivatized product is compared with the curve of acetylbenzonitrile in step (1), and the concentration of salicylaldoxime in the water environment is calculated by the external standard method...

Embodiment 3

[0045] For the analysis of salicylaldoxime in water samples near the mining area of ​​Dexing Copper Mine, the analysis steps include:

[0046] 1. Use GC-ECD to measure 0.01, 0.02, 0.1, 0.5, 1 μg mL respectively -1 Acetyl benzonitrile standard solution, the ratio k of the response peak area and its concentration to obtain acetyl benzonitrile is 0.9991;

[0047] 2. At room temperature, take the wastewater containing salicylaldoxime, add 1.25g Na 2 CO 3 , 0.12g NaCl (m / v), dilute to 25mL. Add 1mL acetic anhydride (AA) and 5mL cyclohexane at the same time. After about five minutes, take the upper organic phase and add it to a 50mL centrifuge tube. Wash away the acetic anhydride in the organic phase with 8-10mL deionized water. After washing twice, Injection.

[0048] 3. The peak area of ​​the obtained derivatized product is compared with the curve of acetylbenzonitrile in step (1), and the concentration of salicylaldoxime in the water environment is calculated by the external ...

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Abstract

The invention discloses a method used for measuring the content of salicylaldoxime in water environment. The method comprises following steps: 1, acetylbenzonitrile standard solutions of different concentration are prepared, and are subjected to gas chromatographic detection so as to obtain the ratio k of the response peak area to the concentration of acetylbenzonitrile; 2, a water solution containing salicylaldoxime is collected, pH value is adjusted to be higher than 7, an excess acetylation reagent and an organic solvent capable of separating from water are added for acetylation, and after reaction, an obtained organic phase is washed with water so as to remove the excess acetylation reagent; 3, the organic phase processed via washing is delivered into a bottle for gas chromatographic detection, and the concentration of salicylaldoxime in the water solution is calculated based on measure peak area and the ratio k. The method is high in accurate; the average relative standard deviation ranges from 2.1 to 8.4%; recovery rate is high; average recovery rate ranges from 88.7 to 92.7%; detection limit is as low as 2.13<mu>g/L; operation is convenient; sensitivity and repeatability are high; and quantification is accurate.

Description

technical field [0001] The invention relates to a method for measuring salicylaldoxime content in water environment, and belongs to the technical field of sewage detection and analysis. Background technique [0002] Salicylaldoxime contains multiple electron donors, has a strong coordination ability, has a certain collection ability and good selectivity, and has an irreplaceable role in the flotation process of rare earth ore and oxide ore. It is an efficient High selectivity mine flotation collector. Salicylaldoxime can selectively interact with the mineral surface, thereby improving the hydrophobicity of the mineral surface, so that the mineral can be adsorbed on the surface of the air bubbles and float up. Therefore, salicylaldoxime plays a decisive role in achieving the flotation of minerals. At the same time, salicylaldoxime also plays an important role in the determination of Pt, Cu, Zn, Ni and Pb sensitive analytical reagents. On the other hand, salicylaldoxime is ...

Claims

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Application Information

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IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 李海普孔倩杨兆光
Owner CENT SOUTH UNIV