Method for detecting oxidative metal ion in water

A metal ion and oxidizing technology, applied in the direction of electrochemical variables of materials, can solve the problem of low lead, etc., and achieve the effect of low price, simple equipment and low cost

Inactive Publication Date: 2009-03-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the current research on metal ions is still limited to NH 4 + , Na

Method used

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  • Method for detecting oxidative metal ion in water
  • Method for detecting oxidative metal ion in water
  • Method for detecting oxidative metal ion in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This example uses an electrochemical workstation (Autolab, PGSTAT30, Netherland Metrohm Co.Ltd) and an electrochemical three-electrode test system. The reference electrode is a calomel electrode, and the auxiliary electrode is a platinum electrode. The platinum wire is inserted into the capillary and sealed at the front to form Platinum electrode (working electrode).

[0034] The iodine stock solution was obtained by direct preparation to study the reaction mechanism of iodine at the interface of MIBK / aqueous solution. The preparation method is prepared by the reaction of hydrogen peroxide and KI, and then the exact concentration is calibrated by the iodometric method, and the corresponding dilution is carried out according to the concentration required for the experiment. Pipette the calibrated iodine solution and MIBK in a separatory funnel to carry out an equal-volume extraction, and after standing to separate layers, take the extracted I 2 The MIBK was placed in a ...

Embodiment 2

[0040] This example uses an electrochemical workstation (Autolab, PGSTAT30, Netherland Metrohm Co.Ltd) and an electrochemical three-electrode test system. The reference electrode is a calomel electrode, and the auxiliary electrode is a platinum electrode. The platinum wire is inserted into the capillary and sealed at the front to form Platinum electrode (working electrode).

[0041] Pipette the copper ion solution into a stoppered Erlenmeyer flask, transfer excess KI solution, add water to dilute to 10ml, add an equal volume of MIBK solvent, and extract in the Erlenmeyer flask. During the measurement, use a micro-injector to draw a small amount (generally 20-40 μL) of the extracted sample and inject it into a glass microtube. The aqueous phase is a 1mol / L KCl solution, which is circulated on the liquid / liquid interface with a three-electrode system. Voltammetric analysis (eg figure 1 shown).

[0042] The cyclic voltammetry conditions are: the scanning potential range is -0.5...

Embodiment 3

[0045] This example uses an electrochemical workstation (Autolab, PGSTAT30, Netherland Metrohm Co.Ltd) and an electrochemical three-electrode test system. The reference electrode is a calomel electrode, and the auxiliary electrode is a platinum electrode. The platinum wire is inserted into the capillary and sealed at the front to form Platinum electrode (working electrode).

[0046] Pipette the Cr(VI) solution into a stoppered Erlenmeyer flask, transfer excess KI solution, add water to dilute to 10ml, add an equal volume of MIBK solvent, and extract in the Erlenmeyer flask. During the measurement, use a micro-injector to draw a small amount (generally 20-40 μL) of the extracted sample and inject it into a glass microtube. The aqueous phase is a 1mol / L KCl solution, which is circulated on the liquid / liquid interface with a three-electrode system. Voltammetric analysis (eg figure 1 shown).

[0047] The cyclic voltammetry conditions are: the scanning potential range is -0.5~+0....

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Abstract

The invention discloses a method for measuring the oxidizing metallic ions in water, pertaining to the technical field of environmental monitoring. The method is as follows: a organic solvent containing iodine after extraction is poured into a glass micropipe; then, a platinum wire is inserted into the glass micropipe of which the front end is sealed to form a platinum electrode, namely, a working electrode which is just positioned on the interface of electrolyte solution without iodine ions so as to from a liquid/ liquid interface; and after a reference electrode, an auxiliary electrode and the working electrode are all well fixed, the three electrodes are connected with an electrochemical analyzer, then electrochemical analysis is carried out by square wave voltammetry or cyclic voltammetry so as to measure the metallic ions with strong oxidizing property. As an organic solvent MIBK has low toxicity and does not dissolve in water, the characteristics of environmental harm and the like of the traditional dropping mercury electrode are overcome; in addition, the method also has the advantages of simple and convenient operation, high sensibility, low cost and being capable of carrying our measurement on the metallic ions with oxidizing property in industrial sewage.

Description

technical field [0001] The invention relates to a detection method in the technical field of electrochemistry, in particular to a method for measuring oxidative metal ions in water. Background technique [0002] Oxidizing metal ions, including Cr(VI), Cu 2+ Wait. Among them, Cr(VI) is often used as chromic acid in the electrochemical industry. In addition, it is also used in the colorant (ie lead chromate) in the pigment and in the cooling water circulation system. Cr(VI) is an ingestion poison / extreme inhalation poison, skin contact may cause sensitivity, more likely to cause hereditary gene defects, inhalation may cause cancer, and has persistent danger to the environment. Therefore, Cr(VI) is an important indicator of water pollution control. [0003] Copper is an essential trace element for the human body. Copper deficiency will cause anemia, diarrhea and other diseases, but excessive intake of copper will also cause harm. Copper is more harmful to aquatic organisms...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30
Inventor 贾金平谢少艾史常艳舒菲菲王硕
Owner SHANGHAI JIAO TONG UNIV
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