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A method for ultra-high sensitivity detection of nickel ions

A nickel ion, sensitivity technology, applied in the direction of measuring devices, instruments, electrochemical variables of materials, etc.

Active Publication Date: 2022-04-19
SHENZHEN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects of the existing nickel ion detection method and propose a method for detecting nickel ion with ultra-high sensitivity

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  • A method for ultra-high sensitivity detection of nickel ions
  • A method for ultra-high sensitivity detection of nickel ions
  • A method for ultra-high sensitivity detection of nickel ions

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Embodiment Construction

[0025] A method for ultra-high sensitivity detection of nickel ions, comprising the following steps:

[0026] Step 1: Preparation of Mercury Membrane Electrode (MFE)

[0027] Polish the glassy carbon electrode (GCE) with 1 μm, 0.3 μm, and 0.05 μm alumina slurry, and then ultrasonically wash it with 1:1 nitric acid, absolute ethanol, and water for 1 to 2 minutes, and dry it for later use;

[0028] in N 2 protected by immersion by 10 -4 mol / L Hg 2+ , 0.1mol / L potassium nitrate and 0.01mol / L nitric acid mixed solution for 5 minutes;

[0029] MFE was prepared by depositing at a constant voltage of -1.2V for 300s at a stirring speed of 600rpm;

[0030] Step 2: Fast Scan Voltammetry (FSV) Detection of Nickel Ions

[0031] in N 2 Under protection, the MFE prepared in step 1 was immersed in different concentrations of Ni 2+ (10 -6 ~10 -14 mol / L)+0.1mol / L dimethylglyoxime (DMG)+0.1mol / L NH 3 / NH 4 Cl mixed solution for 5 minutes;

[0032] Adsorption was carried out at a sti...

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Abstract

A method for detecting nickel ions with ultra-high sensitivity, comprising the following steps: Step 1: Preparation of mercury film electrodes: polishing glassy carbon electrodes with 1 μm, 0.3 μm, and 0.05 μm alumina slurries respectively, and then using 1:1 nitric acid respectively , absolute ethanol, and water for ultrasonic cleaning for 1–2 min, and then dried for later use; in N 2 protected by immersion by 10 ‑4 mol / L Hg 2+ , 0.1 mol / L potassium nitrate and 0.01 mol / L nitric acid for 5 minutes; at a stirring speed of 600rpm, deposit at a constant voltage ‑1.2V for 300s to prepare MFE; step 2: rapid deposition of nickel ions Scanning voltammetry detection. The present invention is based on DMG and Ni 2+ The complexation of Ni was established with the help of fast sweep voltammetry for the ultra-high sensitivity detection of Ni 2+ The new method has good practical application prospects.

Description

technical field [0001] The invention relates to a method for detecting nickel ions with ultrahigh sensitivity. Background technique [0002] In recent years, the pollution of toxic elements in the environment has increased sharply, and the determination of toxic metals such as nickel, chromium, and mercury has become a very important task. Nickel metal is frequently used in many industrial applications, including the manufacture of stainless steel, electroplating, catalysts, electronic devices and coinage, among others. However, long-term exposure to nickel may lead to several health hazards, such as heart and liver damage and respiratory cancers. Nickel ions (Ni) in drinking water recommended by the World Health Organization (WHO) 2+ ) The upper limit is 0.07mg / L. Therefore, there is an urgent need for some sensitive and economical Ni 2+ Detection method. [0003] Currently, Ni 2+ The main detection methods are spectroscopic and electrochemical methods. Spectroscopic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/49G01N27/30
CPCG01N27/49G01N27/308
Inventor 蒋晓华吕智文丁文捷
Owner SHENZHEN POLYTECHNIC
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