Electrolyte solution to detect hexavalent chromium via mercury film electrode and method to detect hexavalent chromium via electrolyte solution

An electrolyte solution, a technology using mercury film, applied in the direction of material electrochemical variables, etc., can solve the problems of complexity, mercury film falling off, cumbersome and other problems, and achieve the effect of reducing the dissolution peak current value, improving sensitivity and reducing time

Active Publication Date: 2019-03-01
SHANGHAI YIDIAN SCI INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Chromium is a multivalent metal, and the mutual transformation between ions of different valences is easy to occur during the reaction process;
[0006] 2. Pre-mercury film measurement of hexavalent chromium is easy to cause mercury film to fall off during the measurement process, which requires frequent pre-mercury fi

Method used

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  • Electrolyte solution to detect hexavalent chromium via mercury film electrode and method to detect hexavalent chromium via electrolyte solution
  • Electrolyte solution to detect hexavalent chromium via mercury film electrode and method to detect hexavalent chromium via electrolyte solution
  • Electrolyte solution to detect hexavalent chromium via mercury film electrode and method to detect hexavalent chromium via electrolyte solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 1) Take 5 clean 100mL volumetric flasks, add 10mL of the above electrolyte solution, respectively pipette 20μL, 40μL, 60μL, 80μL, 100μL of 100mg / L hexavalent chromium standard solution into 5 volumetric flasks, dilute to Scale, prepare 20μg / L, 40μg / L, 60μg / L, 80μg / L, 100μg / L series of standard solutions, respectively pipette 20mL into the measuring cup.

[0077] 2) Connect the three-electrode system consisting of mercury film electrode, reference electrode and platinum electrode to the portable heavy metal meter.

[0078] 3) Put the three-electrode system into the electrolytic cup containing 20μg / L, 40μg / L, 60μg / L, 80μg / L, 100μg / L serial standard solutions in sequence. Select the "Calibrate" button to calibrate each point in turn, and save the calibration data after the 5-point calibration is completed.

[0079] attached figure 1 It is the superposition of the peak patterns of the series of standard solutions in Example 1. The curves of different concentrations in the...

Embodiment 2

[0081] 1) Take a clean 200mL volumetric flask, add 20mL of the above electrolyte solution, pipette 100μL of 100mg / L hexavalent chromium standard solution into the volumetric flask, dilute to the mark, and prepare a 50μg / L hexavalent chromium standard solution, pipette 20mL into a measuring cup.

[0082] 2) Put the three-electrode system in Example 1 into the 50 μg / L hexavalent chromium standard solution, select the "measurement" button, and measure the solution for 6 consecutive times. The six measurement results were: 48.5μg / L, 50.4μg / L, 49.0μg / L, 49.0μg / L, 50.9μg / L, 49.3μg / L, and the relative standard deviation was 1.87%.

Embodiment 3

[0084] 1) Take a clean 100mL volumetric flask, add 10mL of the above electrolyte solution, dilute to the mark, mix well, pipette 20mL into the measuring cup for later use.

[0085] 2) Accurately pipette 40 μL of 1 mg / L hexavalent chromium standard solution into the measuring cup of 1), the theoretical value is 2 μg / L.

[0086] 3) Put the three-electrode system into the measuring cup and start the standard addition test. Add 60 μL of 1 mg / L hexavalent chromium standard solution to the same cup solution twice in a row. After the measurement, the instrument directly reads the result as 2.58 μg / L, close to the theoretical value of 2μg / L.

[0087] It can be seen from the above examples that hexavalent chromium Cr(VI) is first reduced to trivalent chromium Cr(III) on the surface of the working electrode of the pre-mercury-plated film, and DTPA present in the solution is adsorbed on the surface of the mercury film, and reacts with trivalent chromium Cr(III). (Ⅲ) Form complex Cr(Ⅲ)-D...

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Abstract

The invention provides a novel electrolyte solution to detect hexavalent chromium via a mercury film electrode and a method to detect hexavalent chromium via the electrolyte solution. The electrolytesolution comprises acetic acid-sodium acetate buffered solution having the concentration of 0.2-2 mol/L, DTPA (diethylenetriaminepentaacetic acid) having the concentration of 10-60 g/L, sodium nitrate, potassium nitrate or their mixed solution having the concentration of 1-4 mol/L, and sodium chloride, potassium chloride or their mixed solution having the concentration of 0.1-1 mol/L. The method includes 1, mixing electrolyte and a water sample containing hexavalent chromium to be detected in a volume ratio of 1:10 to 1:1; 2, connecting a glassy carbon electrode, reference electrode and platinum electrode system pre-coated with mercury film to a heavy metal detector, inserting in mercury plating liquid containing Hg2+, and treating the applied glassy carbon electrode to reveal mercury filmfrom the surface; 3, washing the electrode system, inserting the electrode system into the electrolyte and connecting with the heavy metal detector, applying different enrichment potentials continuously twice for 10-120 s, and scanning under the frequency range of 0.9 v to 1.5 v.

Description

technical field [0001] The invention belongs to the technical field of analysis and determination of hexavalent chromium in water bodies, and relates to a method for continuously and accurately detecting hexavalent chromium ions by cathodic stripping voltammetry; specifically, it is a novel electrolyte solution for detecting hexavalent chromium using a mercury film electrode and its hexavalent chromium ion. Chromium detection method. Background technique [0002] In the environment, chromium mainly exists in the form of inorganic chromium. The two common stable oxidation states of chromium are trivalent chromium Cr(Ⅲ) and hexavalent chromium Cr(Ⅵ). Trace elements necessary for life, but too high a concentration can be harmful to the human body; and hexavalent chromium Cr(Ⅵ) is mainly present in the environment as CrO 4 2- and HCrO 4 - Hexavalent chromium has high activity and strong toxicity, and hexavalent chromium Cr(Ⅵ) is easily absorbed and stored in the body, which ...

Claims

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Application Information

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IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 迟屹君
Owner SHANGHAI YIDIAN SCI INSTR
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