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Capillary electrophoresis apparatus for water sample heavy metal in-situ monitoring

A technology of capillary electrophoresis and heavy metals, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of high cost, difficulty in meeting long-term monitoring in remote areas, poor long-term stability of data reliability, etc., and achieve low cost, reliability and The effect of good stability and high sensitivity

Pending Publication Date: 2019-03-01
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used on-site detection methods are mostly limited to the use of traditional electrochemical sensors, which are very expensive and only measure simple parameters such as conductance and pH value; although electrochemical sensors for detecting heavy metal content have come out, their data Reliability and long-term stability are poor, and it is difficult to meet the requirements of long-term monitoring in remote areas

Method used

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  • Capillary electrophoresis apparatus for water sample heavy metal in-situ monitoring
  • Capillary electrophoresis apparatus for water sample heavy metal in-situ monitoring
  • Capillary electrophoresis apparatus for water sample heavy metal in-situ monitoring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The reagents used in the experiments were of analytical grade or above, and all solutions were prepared with ultrapure water. Background electrolytes include Na 2 B 4 o 7 , N-tris(hydroxymethyl)methyl-3-aminopropanesulfonic acid (TAPS), tris(hydroxymethyl)aminomethane) / N-cyclohexyl-2-aminoethanesulfonic acid (TRIS / CHES), etc., Adjust to the desired pH with 1mol / L NaOH. Dissolve metal salts in the form of nitrate, chloride or sulfate in 0.01mol / L HNO 3 (trace metal pure) to prepare the stock solution of metal ions, and dilute it step by step to the required concentration when used.

[0045] Before the system is used, the configured electrophoresis buffer, complexing reagents, and samples to be tested must be connected to the corresponding pipeline positions, and the pipeline and waste liquid bottle 13, high-pressure end electrophoresis buffer are drained by turning on the corresponding micro peristaltic pump The reservoir bottle 12 is full.

[0046] Before the capi...

Embodiment 2

[0067] The stability of the present invention is investigated by continuous operation in the laboratory, and the mixed standard solution of Co(II), Cu(II) and Zn(II) metal ions is detected at the same time, and the electrophoresis of cobalt, copper and zinc ions in the separated water samples detected The signal spectrum is as figure 2 As shown, the heavy metal concentration is 80 μmol / L, the abscissa is the time of electrophoresis, and the ordinate is the signal intensity. The metal corresponding to each signal peak is shown in the legend, and the signal peak height is positively correlated with the sample concentration.

[0068] The main performance indicators of the detection are shown in Table 2 below:

[0069] Table 2 Main analysis performance indicators

[0070]

[0071] The present invention has operated continuously in the laboratory for more than 3 months, wherein Cu(II) and Zn(II) ions are continuously detected 945 times, the RSDs of the two kinds of ion migrat...

Embodiment 3

[0073] The content of Zn(II) in the rivers of a certain area was measured on site. There is a large amount of mine wastewater injected into the rivers of this area, and the metal ions contained in it may have a serious impact on the local residents and the ecological environment. A state-of-the-art inductively coupled plasma mass spectrometer (ICP-MS) was used for comparative verification. Assay result of the present invention sees the following table 3:

[0074] Table 3 On-site detection of water samples and the results of base standard addition

[0075]

[0076]

[0077] The measurement results show that the recovery rate of the on-site substrate standard addition of the present invention is between 90% and 113%, and the measurement results of the present invention are consistent with the acceptable level of the inductively coupled plasma mass spectrometer (ICP-MS) of the prior art. The feasibility of the present invention for on-site monitoring of heavy metals in wat...

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Abstract

A capillary electrophoresis apparatus for water sample heavy metal in-situ monitoring comprises a first mini peristaltic pump, a second mini peristaltic pump, a third mini peristaltic pump, a fourth mini peristaltic pump, a first one-way valve, a second one-way valve, a metal tube, a high-voltage-end electrophoresis buffering liquid storage bottle, a waste liquid bottle, a two-way normally-on electromagnetic valve, a crossed four-way buffering liquid storage chamber, a mixing reaction coiler, a capillary tube, a photometric detector and a three-way joint, an electrophoresis high-voltage interface is externally connected with a mini high-voltage power source to serve as an electrode of the electrophoresis separation process, the metal tube serves as another electrode of the electrophoresisseparation process, and the two electrodes form an anode-cathode relationship and form a complete electrophoresis loop, and type of heavy metal and concentration thereof in a solution are determined by analyzing the metal complex solution in the electrophoresis loop through the photometric detector. A detection value of the capillary electrophoresis apparatus is small in deviation relative to a standard value, and the capillary electrophoresis apparatus is high in accuracy, reliability and stability of detection data and has the advantages of low cost, portability, flexibility, easiness in useand high sensitivity.

Description

technical field [0001] The invention relates to the technical field of water sample pollutant monitoring, in particular to a capillary electrophoresis instrument for in-situ monitoring of heavy metals in water samples. Background technique [0002] With the continuous acceleration of industrialization and urbanization, the pollution of heavy metals in environmental water has become particularly serious, seriously endangering people's health. Most of the mines and mines are located in remote areas, and their impact on the local water environment cannot be ignored. However, due to the inconvenient transportation in remote areas, the monitoring of pollutants in environmental water bodies is extremely challenging, and it is difficult to achieve regular manual sampling. During the storage and transport of analytes to the laboratory, it is very easy to cause the loss or contamination of the monitoring target. Therefore, the development of portable on-site monitoring instruments w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/447
CPCG01N27/44726G01N27/44756
Inventor 张敏刘帅梁英
Owner GUILIN UNIV OF ELECTRONIC TECH
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