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A method for distinguishing multiple metal ions using a single indicator

A metal ion and indicator technology, which is used in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. Complicated and other problems, to achieve the effect of low cost, easy portability and simple structure

Inactive Publication Date: 2019-03-05
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the experimental steps involved in these methods are usually more complicated, and the operation is more cumbersome, which is difficult for non-professionals to implement, and the wide applicability is limited.

Method used

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  • A method for distinguishing multiple metal ions using a single indicator
  • A method for distinguishing multiple metal ions using a single indicator
  • A method for distinguishing multiple metal ions using a single indicator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In this embodiment, the steps of multiple metal ion detection are as follows:

[0063] a. Screening of a single indicator

[0064] At room temperature, take different masses of dithizone (1mg, 2mg, 4mg, 6mg, 8mg, 10mg) and dissolve each mass of dithizone in 1mL of different molar concentrations (0.1M, 0.5M, 1M , 2M) NaOH aqueous solution, as an indicator, investigate the color change of all indicators mixed with the metal ion aqueous solution, and select the indicator formula with fast response and sensitive detection.

[0065] The preferred result in this embodiment is: dissolving 6 mg of dithizone in 1 mL of NaOH aqueous solution with a molar concentration of 2M to obtain a single indicator.

[0066] b. Metal ion detection method

[0067] Take 200 μL of single indicator and mix with 600 μL of different kinds of metal ion aqueous solutions (that is, take 600 μL of each metal ion aqueous solution and mix with 200 μL of single indicator), and observe the color change. ...

Embodiment 2

[0077] In this embodiment, the steps of multiple metal ion detection are as follows:

[0078] a. Screening of a single indicator

[0079] At room temperature, take 200 μL of cetyltrimethylammonium bromide aqueous solution (CTAB) with different concentrations (0.5mM, 1mM, 1.5mM, 3mM, 4.5mM, 6mM and 9mM) and 200μL of 1mM dithizone (0.2M NaOH aqueous solution as the solvent) was mixed in 4.6mL deionized water to obtain indicators of different formulations.

[0080] Take 750 μL of the above indicator and 250 μL of 20 μM Cd-containing 2+ Mix the aqueous solution to investigate the above indicator and the Cd-containing 2+ The color change of the aqueous solution after mixing, select the indicator formula with fast response and obvious color change.

[0081] The preferred result of this example is: when the molar ratio of CTAB and Dithizone (Dithizone) is mixed at 3:1, the obtained indicator detects Cd 2+ works best, such as Figure 6 as shown, Figure 6 The ordinate is the Euc...

Embodiment 3

[0101] In this embodiment, the steps of multiple metal ion detection are as follows:

[0102] a. Screening of a single indicator

[0103] At room temperature, take 600 μL of cetyltrimethylammonium bromide aqueous solution (CTAB) with different concentrations (1 mM, 2 mM, 3 mM, 6 mM, 9 mM, 12 mM and 18 mM) and 600 μL of 2 mM dithizone (0.2 M NaOH aqueous solution as solvent) were mixed in 13.8mL deionized water to obtain indicators of different formulations. Take 1.5mL of the above indicator and 0.5mL of 20μM Cd-containing 2+ Mix the aqueous solution to investigate the above indicator and the Cd-containing 2+ The color change of the aqueous solution after mixing, select the indicator formula with fast response and obvious color change.

[0104] The preferred result in this example is: when the molar ratio of CTAB and dithizone (Dithizone) is mixed at 3:1, the obtained indicator detects Cd 2+ works best.

[0105] b. Metal ion detection method

[0106] Get 1.5mL of the abov...

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Abstract

The invention discloses a method for differentiating multiple types of metal ions through single indicator. The method comprises the following steps of 1, mixing metal ion indicator with surfactant, or mixing the metal ion indicator with a NaOH aqueous solution, so that the single indicator is obtained; 2, mixing the single indicator with different metal ion aqueous solutions separately, collecting images obtained before and after mixing, and extracting color change data of the images obtained before and after mixing; 3, mixing the metal ion aqueous solution to be detected with the single indicator, collecting color change of the images before and after the metal ion aqueous solution to be detected is mixed with the single indicator, and comparing the color change with the color change data obtained in step 2, so that the categories of the metal ions in the metal ion aqueous solution to be detected are obtained. By means of the method for differentiating multiple types of metal ions through the single indicator, multiple types of metal ions in the aqueous solution can be rapidly detected.

Description

technical field [0001] The invention relates to the technical field of metal ion detection, in particular to a method for distinguishing multiple metal ions by using a single indicator. Background technique [0002] Multi-channel sensors can precisely distinguish a variety of complex elements such as heavy metals, antibiotics, amino acids and proteins, etc. Therefore, in recent years, research institutes, enterprises and institutions have worked hard to construct different types of sensors for the realization of toxic substances (such as heavy metals and pesticides), food or food additives (such as clenbuterol and antibiotics), disease-inducing substances (such as abnormal protein), toxic gases (such as formaldehyde and toxic elements in smog), etc. [0003] In general, three common approaches to building multi-channel sensors are as follows: [0004] 1) Construct a sensing array based on a series of colorimetric and fluorescent indicators that cross-react with the analyte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 冷玉敏林恒伟宋玉玲冷超粮马春华
Owner NANYANG NORMAL UNIV
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