Non-chromatographic mercury morphological analysis method based on dielectric barrier discharge low-temperature atomizer

A technology of dielectric barrier discharge and atomizer, which is applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as difficult automation, and achieve the effect of less gas consumption, low power consumption, simple and fast measurement

Inactive Publication Date: 2010-10-20
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both methods have the advantage of being inexpensive, but are difficult to automate

Method used

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  • Non-chromatographic mercury morphological analysis method based on dielectric barrier discharge low-temperature atomizer
  • Non-chromatographic mercury morphological analysis method based on dielectric barrier discharge low-temperature atomizer
  • Non-chromatographic mercury morphological analysis method based on dielectric barrier discharge low-temperature atomizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The dielectric barrier discharge atomizer adopts a parallel plate structure, which uses a power supply of 220V, 20KHz ozone generating power (5W); ordinary glass is used as the insulating medium (blocking medium), its thickness is 1mm, and the distance between the two insulating mediums is 1mm. With 0.01% (m / v) NaBH 4 Is the reducing agent; 1% (v / v) HCl is the carrier flow; Ar is the carrier gas, and the carrier gas flow rate is 60mLmin -1 . The signal was detected by atomic absorption, and the collected lake water was used for standard recovery experiments using the established method. The specific method is: using the reducing agent NaBH 4 Reduction of inorganic mercury to Hg 0 , while organic mercury such as methylmercury generates organic mercury hydride, when the dielectric barrier discharge atomizer is not discharged, the concentration of inorganic mercury is obtained by measuring the inorganic mercury; when the dielectric barrier discharge atomizer is dischar...

Embodiment 2

[0026] The dielectric barrier discharge atomizer adopts a parallel plate structure. The power supply is 220V, 20KHz ozone generating power supply (7W); ordinary glass is used as the insulating medium (blocking medium), its thickness is 1mm, and the distance between the two insulating mediums is 2mm. With 0.01% (m / v) NaBH 4 Is the reducing agent; 1% (v / v) HCl is the carrier flow; Ar is the carrier gas, and the carrier gas flow rate is 100mL min -1 . The signal was detected by atomic absorption, and the fish samples were analyzed using the established method, similar to Example 1. The standard substance GBW10029 was tested on 5 fish samples collected from Guangxi. The results of the determination of inorganic mercury and methylmercury are shown in Table 2.

[0027] Table 2 Determination of inorganic mercury and methylmercury in standard substances and fish samples

[0028]

[0029]

Embodiment 3

[0031] The dielectric barrier discharge atomizer adopts a parallel plate structure. Quartz is used as the insulating medium (blocking medium), its thickness is 2mm, and the distance between the two insulating mediums is 3mm. The power supply adopts 10000V, 30KHz. With 0.01% (m / v) KBH 4 Is the reducing agent; 1% (v / v) HCl is the carrier flow; Ar is the carrier gas, and the carrier gas flow rate is 50mL min -1 . The signal is measured by atomic absorption, and ethylmercury is measured, and the specific method is the same as in Example 1, and its linear range is 5-100ng mL -1 .

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Abstract

The invention belongs to the technical field of element morphological analysis in analytical chemistry, and more particularly relates to a non-chromatographic mercury morphological analysis method based on a dielectric barrier discharge low-temperature atomizer. The method uses reducing agent for reducing inorganic mercury in a sample into HgO, and leads organic mercury to be generated into organic mercury hydride; when the dielectric barrier discharge atomizer does not discharge, the inorganic mercury is measured to obtain the concentration of the inorganic mercury; when the dielectric barrier discharge atomizer discharges, the organic mercury hydride is atomized, and the concentration of total mercury can be obtained; obtaining the concentration of the organic mercury which is the difference valve between the concentration of the total mercury and the concentration of the inorganic mercury. The non-chromatographic mercury morphological analysis method has the advantages that the method is simple and rapid in measurement, can be used for measuring the sample within a minute, and has low gas consumption (40-100ml min<-1> and low power consumption (less than or equal to 20W).

Description

technical field [0001] The invention belongs to the technical field of element speciation analysis in analytical chemistry, and in particular relates to a non-chromatographic mercury speciation analysis method based on a dielectric barrier discharge low-temperature atomizer. Background technique [0002] At present, the speciation analysis method of mercury mainly utilizes chromatographic technology, usually combining high-performance liquid chromatography, gas chromatography and capillary electrophoresis with high-sensitivity detection instruments. Chromatographic techniques can provide full information on mercury speciation, but they have the disadvantages of time-consuming, expensive instruments, and complex sample handling procedures. [0003] Non-chromatographic methods are good alternatives to chromatographic methods because they are less time-consuming, less expensive, and easier to implement. Non-chromatographic speciation analysis techniques for mercury mainly incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 朱振利刘志付郑洪涛
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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