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Method for measuring multiple heavy metals in surface water by co-plating mercury film

A measurement method, surface water technology, applied in the direction of material electrochemical variables, etc., can solve problems such as low oxidation potential, influence on Cu measurement, and inaccurate detection of metal elements, so as to reduce test time and discharge volume, and simplify the process Effect

Pending Publication Date: 2021-08-10
深圳市朗石科学仪器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 101975811A provides an electrochemical analysis method for on-site trace heavy metal detection using anodic stripping voltammetry. However, if the co-plating scheme is adopted, due to the low oxidation potential of Bi, the detection of many metal elements cannot be accurately carried out. Typically, the measurement of Cu will be significantly affected, resulting in the need for precise control of Bi. Concentration, or the auxiliary use of other modified electrodes, which limits its use

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  • Method for measuring multiple heavy metals in surface water by co-plating mercury film
  • Method for measuring multiple heavy metals in surface water by co-plating mercury film
  • Method for measuring multiple heavy metals in surface water by co-plating mercury film

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Embodiment 1

[0028] A method for measuring mercury co-plating films of multiple heavy metals in surface water, comprising the following steps:

[0029] S1. Mix pure water with a volume ratio of 1:1 and the first electrolyte and add it to the measuring cell. The first electrolyte is CH 3 COOH-CH 3 COONa buffer and Hg(NO 3 ) 2 The mixed solution, the pH of the first electrolyte is 3, where Hg 2+ The concentration is 0.01g / L, insert working electrode, reference electrode and counter electrode, working electrode, reference electrode and counter electrode are connected to control potentiometer by wire, and described working electrode is conductive ITO electrode; Reference electrode can be Saturated calomel electrode, the counter electrode is a platinum sheet electrode, enriched at a constant potential of -1.2 to -0.9V for 1 to 3min, and then applied a positive potential in the range of -0.9 to 0.2V to scan the dissolution response signal to obtain the blank solution at A graph of the peak c...

Embodiment 2

[0036] A method for measuring mercury co-plating films of multiple heavy metals in surface water, comprising the following steps:

[0037] S1. Mix pure water with a volume ratio of 9:1 and the first electrolyte and add it to the measuring cell. The first electrolyte is CH 3 COOH-CH 3 COONa buffer and Hg(NO 3 ) 2 The mixed solution, the pH of the first electrolyte is 6, where Hg 2+ The concentration is 5.0g / L, inserts working electrode, reference electrode and counter electrode, and working electrode, reference electrode and counter electrode are connected to control potentiometer by wire, and described working electrode is glassy carbon electrode; Reference electrode can be Silver / silver chloride electrode, the counter electrode is a platinum sheet electrode, enriched at a constant potential of -1.2 to -0.9V for 1 to 3 minutes, and then applied a positive potential in the range of -0.9 to 0.2V to scan the dissolution response signal to obtain a blank solution A graph of th...

Embodiment 3

[0044] A method for measuring mercury co-plating films of multiple heavy metals in surface water, comprising the following steps:

[0045] S1. Mix pure water with a volume ratio of 6:1 and the first electrolyte and add it to the measuring cell. The first electrolyte is CH 3 COOH-CH 3 COONa buffer and Hg(NO 3 ) 2 The mixed solution, the pH of the first electrolyte is 4.5, where Hg 2+ The concentration is 2.0g / L, insert working electrode, reference electrode and counter electrode, working electrode, reference electrode and counter electrode are connected to control potentiometer by wire, and described working electrode is glassy carbon electrode; Reference electrode can be Silver / silver chloride electrode, the counter electrode is a platinum sheet electrode, enriched at a constant potential of -1.2 to -0.9V for 1 to 3 minutes, and then applied a positive potential in the range of -0.9 to 0.2V to scan the dissolution response signal to obtain a blank solution A graph of the p...

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Abstract

The invention relates to the technical field of detection of concentration of heavy metals in water and particularly relates to a method for measuring multiple heavy metals in surface water through a co-plated mercury film. The method comprises the following steps of S1, mixing pure water and a first electrolyte, and measuring a blank solution; S2, mixing the pure water and the second electrolyte, measuring the blank solution for the second time, and discharging the solution; S3, mixing the standard solution and the first electrolyte, and measuring the standard solution; S4, mixing the standard solution and the second electrolyte, measuring the standard solution for the second time, and discharging the solution; S5, mixing the water sample with the first electrolyte, and measuring the water sample; and S6, mixing the water sample and the second electrolyte, measuring the water sample for the second time, obtaining a working curve through the response of the blank and the standard solution, and analyzing to obtain the concentration of the heavy metal to be measured in the water sample. Compared with the prior art, when the method is used for measuring various heavy metals in a water sample, the test time and the liquid discharge amount are reduced so that the process is simplified.

Description

technical field [0001] The invention relates to the technical field of heavy metal concentration detection in water, in particular to a method for measuring a mercury co-plating film of various heavy metals in surface water. Background technique [0002] Accurate, rapid and effective on-site determination of trace heavy metals has become an important content in the research of analytical methods in recent years. At present, the main methods for determining the content of heavy metals in water samples are atomic absorption spectrometry, atomic fluorescence spectrometry, inductively coupled plasma atomic emission spectrometry and electrochemical stripping voltammetry. Atomic absorption spectrometry is an important method for determining the concentration of heavy metals in water samples. It is widely used in environmental monitoring as a standard. However, this method requires a large analytical instrument-atomic absorption spectrometer, which requires many steps, long time an...

Claims

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Application Information

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IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 范芫钟严百平
Owner 深圳市朗石科学仪器有限公司
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