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Method for measuring trace copper ion by using light absorption ratio difference and continuous-flow

A light absorption ratio and copper ion technology, applied in the field of environmental analysis, can solve the problems of insufficient sensitivity to accurately measure trace copper ions, inability to automate and on-line detection, low analysis efficiency, etc., to achieve continuous measurement and on-line detection, improve Good mixing efficiency and repeatability

Inactive Publication Date: 2007-08-08
TONGJI UNIV
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Problems solved by technology

Although the spectrophotometric method has the characteristics of simple and cheap instruments and simple operation, this method is relatively susceptible to interference from other ions, and the sensitivity is not enough to accurately determine trace copper ions in natural water with a concentration below 0.01mg / l
However, the early light absorption ratio difference method is mainly manual operation, which cannot be automated and online detection, and it takes a long time (about 20 minutes), and the analysis efficiency is low.

Method used

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  • Method for measuring trace copper ion by using light absorption ratio difference and continuous-flow
  • Method for measuring trace copper ion by using light absorption ratio difference and continuous-flow

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Determination of copper ion concentration in Yangtze River water.

[0032] See Figures 1, 2 and 3. Firstly, add acetic acid-sodium acetate buffer solution with pH=4.0 and naphthalene chrome green G respectively in the conical flask for reaction to prepare 0.04 mmol / l chromogenic solution. Then take a series of 10ml colorimetric tubes, 7 in total, add different concentrations of copper ions respectively, so that the final concentration of copper ions is 0; 0.0030mg / L; 0.0060mg / l; 0.0090mg / l; 0.0120mg / l; 0.0150 mg / l and 0.0180 mg / l. Connect the triangular flask containing the chromogenic solution (chromogenic reagent and buffer solution) to one port of the mixing reactor, and connect the colorimetric tubes of the above-mentioned copper ion standard samples (solutions) with different concentrations to the other port respectively. Use the peristaltic pump control software to start the peristaltic pump. The peristaltic pump runs at a speed of 1000r / min. The operating mode ...

Embodiment 2

[0035] Determination of copper ion concentration in Yangtze River water.

[0036] See Figures 1, 2 and 3. Firstly, add acetic acid-sodium acetate buffer solution with pH=5.0 and naphthalene chrome green G into the conical flask for reaction to prepare 0.04mmol / l chromogenic solution. Then adopt the procedure and method identical with embodiment 1 to measure copper ion concentration and be finally respectively 0,0.0030mg / L, 0.0060mg / l, 0.0090mg / l, 0.0120mg / l, 0.0150mg / l and 0.0180mg / l Copper ion standard sample, obtain the absorbance A of the above-mentioned different concentrations of copper ion standard sample 508 and A 586 , to calculate the absorbance ratio A r , A r =A 586 / A 508 . and the difference between the absorbance ratio ΔA r =A 586 / A 508 -A 0 586 / A 0 508 ; where A 0 508 and A 0 586 Is the blank standard sample (copper ion concentration is 0), absorbance at 508nm and 586nm; with ΔA r Draw a graph for the copper ion concentration, and the system...

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Abstract

It is an optical absorption ratio difference continuous flow determination trace amounts copper ion method, relating to a continuous flow analysis and optical absorption ratio difference linked water samples determination trace amounts copper ion concentration method. Prepare 0.04mmol / l chromium naphthalene green G and pH 4~5 acetate - sodium acetate buffer solution mixture as color solution; use peristaltic pump, mixed reactor, circulation pool an spectrophotometer to determine the water sample. The peristaltic pump uses 1000r / min speed to pump simultaneously the copper ion samples and color solution into a self-designed mixed reactor, and passing through the circulation pool, using the spectrophotometer to measure the copper ion sample concentration of 0-0.0180mg / l scope and 508nm wavelength and 586nm absorbance, to calculate the absorbance ratio, and draw the line; use the same method to determine absorbency of measured water samples; compare the line to calculate the copper ions concentration in water sample. The invention is fast, efficient and reproducible, and it can be online monitoring and continuous determination. It is suitable for rapid determination and online analysis for trace copper ions in drinking water, surface water, and other natural waters.

Description

technical field [0001] The invention relates to a method for measuring the concentration of trace copper ions in water samples by combining continuous flow analysis and light absorption ratio difference. The method can quickly and efficiently monitor the concentration of trace copper ions in water samples, and belongs to the field of environmental analysis. Background technique [0002] Copper ion is an important metal ion widely present in water bodies, and its existence is of great significance to animals, plants and human beings. However, excessive copper ions entering the water body will cause serious environmental pollution and affect human health and the reproduction and survival of animals and plants. Therefore, it is necessary and urgent to quickly and efficiently monitor the concentration of copper ions in water. At present, the main methods for determining the concentration of copper ions in water samples are: graphite furnace atomic absorption method, inductively...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/78G01N21/05
Inventor 郜洪文刘祥虎贾江雁王春雷陈玲
Owner TONGJI UNIV
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