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A method for rapid on-site detection of metal ions based on smartphones

A technology of metal ions and precious metals, which is applied in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials.

Active Publication Date: 2021-03-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the mature and commonly used methods for detecting metal ions at home and abroad include atomic absorption spectrometry (AAS), inductively coupled plasma mass spectrometry (ICP-MS), X-ray fluorescence spectrometry, etc. However, these methods have the disadvantages of expensive instruments, Incapable of real-time on-site detection, long detection time, professional operating technicians and other defects
At present, there are still some commercial metal ion detection cards on the market, some of which are prepared by soaking the test paper in the organic solution containing the indicator and drying it. This kind of test paper does not take into account the fixation of the indicator, which makes the test paper easy to decolorize and has a short shelf life. ; Others are prepared by directly mixing the indicator with the pulp in the process of preparing the test paper, which is more cumbersome and less sensitive

Method used

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  • A method for rapid on-site detection of metal ions based on smartphones
  • A method for rapid on-site detection of metal ions based on smartphones
  • A method for rapid on-site detection of metal ions based on smartphones

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0258] Embodiment 1 Accuracy detection

[0259] Add different doses of trivalent chromium ions and dichromate ions to deionized water at a ratio of 1:1 to make an aqueous solution with known total chromium ion concentration: C 0 -C 8 , where C 0 For blank control.

[0260] Configure the gold nano-optical probe: take 5mmol / L chloroauric acid aqueous solution 5mL and add it to 100mL 0.25mmol / L gallic acid solution, stir magnetically for 30 minutes to obtain colloidal gold wrapped in gallic acid, and use hydrochloric acid solution to adjust the pH of the gold sol The value is adjusted to 3-4 to obtain a gold nanometer optical probe.

[0261] Add 200 μl of the solution to be tested with different concentrations of total chromium ions into 800 μl of the detection system, and use the smartphone to quickly obtain the RGB value of each reaction mixture.

[0262] result

[0263] Preset A=R / (R+G+B), process the obtained data and substitute into the corresponding standard curve (X-(...

Embodiment 2

[0267] Embodiment 2 specific detection

[0268] Add other interfering metal ions (Ba 2+ , Cu 2+ , Cd 2+ , Al 3+ , Hg 2+ , Ni 2+ , Fe 3+ , Zn 2+ , Pb 2+ , Mg 2+ , Na + , K + , Ca 2+ , Fe 2+ , Mn 2+ ,Co 2+ , PO 4 3- , SO 4 2- , NO 3- , CO 3 2- ) (added in the form of salt, the total concentration of the added interfering metal ions is about 10 μmol / L), and then repeat the method used in Example 1 to measure the aqueous solution of known concentration.

[0269] result

[0270] Preset A=R / (R+G+B), process the obtained data and substitute into the corresponding standard curve (X-(A 0 -A i ) / A 0 ) to obtain the content values ​​of metal ions in each liquid to be tested (as shown in Table 2).

[0271] Table 2

[0272]

[0273] As can be seen from Table 2, the measured concentration obtained by the method of the present invention is still very close to the known concentration of the liquid to be tested, and the recovery rate is between 86.6% and 115%. Eve...

Embodiment 3

[0275] Embodiment 3 detects copper ion

[0276] Collect water samples S3.1-S3.4 to be tested, which may contain copper ions.

[0277] Configure the silver nano-optical probe: Take 1mL 0.1mmol / L sodium borohydride (reducing agent) solution and slowly add it dropwise to 100mL aqueous solution containing 0.2mmol / L silver nitrate and 5μmol / L sodium pyrophosphate, and magnetically stir for 30 minutes , to obtain silver nano-optical probes.

[0278] Add 200 μL of the water sample to be tested and the blank control water sample to 800 μL of the prepared detection solution, and observe and compare the color changes of the test mixture and the control group.

[0279] After about 20 minutes, the colors of the three test mixtures did not change, but were bright yellow, indicating that the samples to be tested did not contain copper ions or contained trace amounts of copper ions (the ion concentration was less than 0.1 μmol / L). The color of another test mixture turned colorless, indicat...

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Abstract

The invention relates to a method for quickly detecting metal ions on site based on a smartphone. Particularly, the invention discloses a method for semi-quantitatively detecting the metal ions. The method comprises the following steps of (1) providing liquid to be detected and a precious metal optical probe system; (2) mixing and reacting the liquid to be detected and the precious metal optical probe system to obtain a reaction mixture; (3) extracting first color data of the reaction mixture obtained through the step (2); (4) comparing the first color data with a standard value or a standard curve, thus obtaining the presence or absence and / or the content of detected metal ions in the liquid to be detected. The invention also discloses a detection device and application thereof. The detection method has the advantages of simplicity and convenience in operation, capability of real-time on-site quick testing, low cost, high detection sensitivity, high anti-jamming capability, capability of realizing simultaneous detection of multiple metal ions, and the like.

Description

technical field [0001] The invention relates to the field of detection of metal ions, in particular to a method for rapid on-site detection of metal ions based on a smart phone. Background technique [0002] In recent years, the timely early warning and effective control of environmental pollution have become an extremely important part of the country's development. Due to the rapid development of modern industry, many metal ions enter natural water bodies through mining, metal smelting and processing, and chemical wastewater discharge, which seriously endanger human health. Zhou Shengxian, the former minister of the Ministry of Environmental Protection of my country, said when he attended the "Twelfth Five-Year Plan" meeting on the comprehensive prevention and control of heavy metal pollution, "Since 2009, there have been more than 30 major heavy metal pollution incidents in my country, which have seriously affected the health of the public." my country In the new "Drinking...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 吴爱国董晨沈折玉汪竹青张玉杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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