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A method for rapid detection of metal copper ions

A metal copper and copper ion technology, applied in the field of analytical chemistry, can solve the problems of cumbersome pretreatment process, and achieve the effects of easy detection, long storage time, and simple operation.

Active Publication Date: 2018-12-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection by square wave stripping voltammetry needs to enrich the mercury film on the surface of the electrode in advance, and the pretreatment process is cumbersome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] After the tap water was filtered through a 0.25 µm filter membrane, 0.5 mL was added to a solution containing 0.01 mol / L dicyandiamide and 0.1 mol / L Na 2 SO 4 Into the detection reagent (pH=1), and add a series of standard samples with copper ion concentration of 0, 50, 70, 100, 300, 500, 700, 1000 ppb respectively, obtain the voltammetry curve by voltammetry, and according to the The peak current intensity draws the working curve of the standard sample. The results showed that the copper ion concentration was well linear in the range of 50-1000 ppb, and its linear equation was: I(A) = 0.00105 × c (µg L –1 ) + 0.01793, R 2 = 0.99818, and its detection limit is 20 ppb.

Embodiment 2

[0026] After the tap water was filtered through a 0.25 µm filter membrane, 0.5 mL was added to a solution containing 0.05 mol / L dicyandiamide and 0.1 mol / L Na 2 SO 4 Standard samples with copper ion concentrations of 150, 350, and 500 ppb were added to the detection reagent (pH=4), and the recovery rate of tap water was detected by voltammetry, and the average recovery rate was 101.6%.

Embodiment 3

[0028] After the unknown water sample was filtered through a 0.25 µm filter membrane, 0.5 mL was added to a solution containing 0.07 mol / L dicyandiamide and 0.5 mol / L Na 2 SO 4 Standard samples with copper ion concentrations of 200, 300, and 400 ppb were added to the detection reagent (pH=3), and the recovery rate of tap water was detected by voltammetry, and the average recovery rate was 98.5%.

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Abstract

The invention discloses a method for rapidly detecting metal copper ions. A dicyandiamide aqueous solution at a certain concentration serving as a detection reagent and a to-be-detected sample are mixed, and the concentration of the copper ions in the to-be-detected sample is rapidly measured by a voltammetry method and by utilizing the fact that a coordination compound produced by reaction of the copper ions and dicyandiamide has electrochemical activity. Compared with the existing other copper ion electrochemical measurement method, the method for identifying the copper ions through specific combination of the copper and the dicyandiamide has the advantage that the detection reliability is improved; by the method, substances do not need to be modified on an electrode, pre-enrichment of the samples is not needed, the pretreatment process is simplified, and the copper ion concentration of the solution can be rapidly detected; and the method is simple and convenient to operate and suitable for rapid detection of the copper ion concentration of water.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a method for rapidly detecting metal copper ions by using dicyandiamide. Background technique [0002] Copper ion is one of the necessary metal ions for the human body. Copper deficiency can cause anemia, bone changes, coronary heart disease, etc. However, excessive copper ions can also cause the loss of the body and the disorder of physiological functions, such as the occurrence of multiple neuritis, neuropathy, etc. Debilitating syndrome, abnormal liver function, Alzheimer (Alzheimer's disease), etc. The World Health Organization (WHO) and the Environmental Protection Agency (EPA) set limits for copper ions in water as 2 mg / L and 1.3 mg / L respectively. my country stipulates that the copper concentration in drinking water shall not exceed 1.0 mg / L. Therefore, it is of great significance to establish a fast and simple method for the detection of copper ions in hum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 孙建军程芳芳郭美鸿黄溦任凌晴赵留创
Owner FUZHOU UNIV
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