Device and method for testing arsenic through atomic fluorescence method

An atomic fluorescence and reactor technology, applied in the field of chemical analysis, can solve the problem of difficult control of capture and release of arsenic elements, and achieve the effects of difficult control of capture and release of arsenic elements, stable analysis, and simple structure

Active Publication Date: 2016-07-27
INST OF QUALITY STANDARD & TESTING TECH FOR AGRO PROD OF CAAS
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  • Abstract
  • Description
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Problems solved by technology

[0004] The object of the present invention is to address the above problems and provide a dielectric barrier discharge pre-concentration device for measuring arsenic by atomic fluorescence method. Directly connected in series with the spectrometer, it can realize the online high-efficiency enrichment of trace arsenic in the sample and accurate and stable analysis

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  • Device and method for testing arsenic through atomic fluorescence method

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Effect test

Embodiment 1

[0020] When the standard solution containing arsenic is passed into the sample peristaltic pump 1, it is mixed with the potassium borohydride solution in the reaction reagent peristaltic pump 2 in the four-way mixer 3, and the 600mL / min argon gas introduced by the three-way connection of the argon source 4 is brought in The reaction ring 5 produces arsenic hydride, and enters the gas-liquid separator 6 to complete the gas-liquid separation. Under the condition that 40 mL / min oxygen is fed into the oxygen source 11 and the voltage of the power supply 7 is set at 9.2 kV, the dielectric barrier discharge reactor 10 The capture of arsenic is completed; then the argon source 4 is connected to the argon gas to purge for 180s, and then the hydrogen gas source 12 is supplied with 200mL / min hydrogen gas. At this time, the voltage of the power supply 7 is 9.5kV, and the release of arsenic is completed; The gas enters the atomic fluorescence spectrometer 13 along with the carrier gas. Un...

Embodiment 2

[0022] Taking the arsenic-containing water sample (national standard GBW08605) as an example, the dielectric barrier discharge pre-concentration device of the present invention is connected in series with the atomic fluorescence spectrometer, and other conditions are the same as in the first embodiment. The content of arsenic in the measured sample was 499±4 micrograms / liter, the average value was within the standard value of 500±8 micrograms / liter of the standard substance, and the relative standard deviation of three determinations was 0.8%.

Embodiment 3

[0024] Taking the arsenic-containing water sample (standard substance GSB-Z50004-200431) as an example, the dielectric barrier discharge pre-enrichment device of the present invention is connected in series with the atomic fluorescence spectrometer, and other conditions are the same as in the first embodiment. The content of arsenic in the measured sample was 58.5±0.4 micrograms / liter, the average value was within the standard value of 60.6±4.2 micrograms / liter of the standard substance, and the relative standard deviation of three determinations was 0.7%.

[0025] The above three examples illustrate that the present invention provides an enrichment device for measuring arsenic by atomic fluorescence method and its use method, which can effectively enrich trace arsenic in water samples and ensure the accuracy and stability of the determination.

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Abstract

The invention provides a device and method for testing arsenic through an atomic fluorescence method. The device comprises a hydride generating device, a dielectric barrier discharging reactor, a power source, a gas circuit and an atomic fluorescence spectrometer. The method for testing an atomic fluorescence spectrometer pre-concentrated with arsenic comprises the steps that an arsenic hydride is generated, at the atmosphere of argon and oxygen mixed gas, the dielectric barrier discharging reactor performs a discharging reaction, and arsenic capture is completed; at the atmosphere of argon and hydrogen mixed gas, the dielectric barrier discharging reactor performs a discharging reaction, arsenic release is completed, and the content of the released arsenic is analyzed through the atomic fluorescence spectrometer. According to the device, the problem that capture and release of arsenic elements are not easily controlled by the dielectric barrier discharging device is solved, and the device has the advantage that online efficient concentration and accurate and stable analysis of trace amount arsenic in a sample can be achieved due to the fact that the device is directly connected with an optical spectrum instrument in series.

Description

technical field [0001] The invention relates to the field of chemical analysis, in particular to a device and method for measuring arsenic by atomic fluorescence method. Background technique: [0002] Arsenic is a harmful element, and inorganic arsenic has been identified as a primary carcinogen by the International Cancer Research Center (IARC). At present, the problem of arsenic pollution in the environment has become very prominent due to excessive mining of mineral deposits, discharge of three wastes, and use of agricultural inputs containing arsenic. In 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources released the National Soil Pollution Survey Bulletin. The results showed that the overall national soil environment situation is not optimistic, and some areas have serious soil pollution. The total point exceeding the standard rate reached 16.1%. Arsenic is the third largest pollutant. Studies have shown that drinking water has alway...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/40G01N21/64
CPCG01N1/40G01N21/6404G01N2001/4038
Inventor 刘霁欣毛雪飞钱永忠王敏齐悦涵
Owner INST OF QUALITY STANDARD & TESTING TECH FOR AGRO PROD OF CAAS
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