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Device and method for measuring zinc through electric heating evaporation atomic absorption spectrometry method

A technology of atomic absorption spectroscopy and electrothermal evaporation, applied in the field of chemical analysis, to achieve the effect of accurate zinc content, simple structure and solving the problem of matrix interference

Inactive Publication Date: 2016-06-29
INST OF QUALITY STANDARD & TESTING TECH FOR AGRO PROD OF CAAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the use of tungsten wire to pre-enrich zinc to eliminate matrix interference in atomic absorption spectroscopy and use it in atomic absorption spectroscopy analysis

Method used

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  • Device and method for measuring zinc through electric heating evaporation atomic absorption spectrometry method

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Effect test

Embodiment 1

[0023] Before the standard solution containing zinc is injected into the tungsten wire capture electrothermal evaporation solid sampling device, the partial pressure of the argon-hydrogen mixed gas source 1 containing 10% hydrogen is set at about 0.5Mpa, and the carrier gas mass flowmeter 2 is set to Set at 700mL / min, zinc is evaporated in the electrothermal evaporation device 4, and is captured and released by the tungsten wire 8, and the aerosol containing atomic zinc enters the atomic absorption spectrometer 16 through the release gas path 12. Under optimal conditions, the linear range of zinc detection is 0-2μg, the regression coefficient of the standard curve is above 0.995, the detection limit of zinc can reach 0.2pg, and the relative standard deviation of multiple determinations is within 5%.

Embodiment 2

[0025] Taking 5mg of rice flour (national standard GBW10045) as an example, use argon-hydrogen mixed gas containing 10% hydrogen as the gas source, set the carrier gas mass flow meter 2 at 700mL / min, and use the zinc pre-enrichment device of the present invention in conjunction with electrothermal evaporation The solid sampling device is connected in series with the atomic absorption spectrometer, and other conditions are the same as those in Example 1. The content of zinc in the determination sample was 14.9 ± 0.7 mg / kg, the average value was within the standard value of 14.4 ± 0.8 mg / kg of the standard substance, and the relative standard deviation of 4 determinations was 4.7%.

Embodiment 3

[0027] Taking 2mg of soil powder (national standard GBW07401) as an example, use argon-hydrogen mixed gas containing 10% hydrogen as the gas source, set the carrier gas mass flow meter 2 at 700mL / min, use the zinc pre-enrichment device of the present invention in conjunction with electric heating The evaporative solid sampling device is connected in series with the atomic absorption spectrometer, and other conditions are the same as those in Example 1. The content of zinc in the determination sample is 695.5±23.5 mg / kg, the average value is within the standard value of 680±25 mg / kg of the standard substance, and the relative standard deviation of 4 times of determination is 3.4%.

[0028] The above three examples illustrate a device and method for the determination of zinc by electrothermal evaporation atomic absorption spectrometry provided by the present invention, which can effectively eliminate the matrix interference in the determination of zinc by atomic absorption spectr...

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Abstract

The invention provides a device and method for determining zinc by electrothermal evaporation atomic absorption spectrometry, including a sample boat, an electrothermal evaporation device, a pre-enrichment device, a carrier gas path, a carrier gas mass flow meter, a release gas path, a T Type atomizer-atomic absorption spectrometer, the pre-concentration device is composed of tungsten wire, tungsten wire power base and pre-concentration device cavity, the tungsten wire is installed on the tungsten wire power base, and the pre-concentration device is placed overhead Center of the device cavity. The solid injection atomic absorption spectrometry for the determination of zinc includes dehydrating and ashing the sample to be tested in the air to obtain an inorganic residue; The aerosol of the tungsten wire is in contact with the tungsten wire, and the zinc is pre-enriched by the tungsten wire; the temperature of the tungsten wire rises to about 1800°C, and zinc atoms are released, and the zinc content is analyzed by an atomic absorption spectrometer. The device solves the problem of matrix interference in the determination of zinc by electrothermal evaporation atomic absorption spectrometry with solid sample introduction, and its advantage is that it can realize accurate and stable analysis of zinc content in the sample without digesting the sample.

Description

technical field [0001] The invention relates to the field of chemical analysis, in particular to a device and method for determining zinc by electrothermal evaporation atomic absorption spectrometry. technical background [0002] Zinc is an essential element for the human body, and it is an indicator of routine detection in the fields of food and hygiene; at the same time, excessive zinc can also cause harm to the human body, especially the discharge of zinc-containing waste residues and wastewater from industrial and mining enterprises will destroy the ecological environment and pass through the biological chain. affect human health. At present, liquid sampling systems are the mainstream technology for the determination of zinc in food instruments and methods. Most of the current national and industry standards for elemental analysis use atomic absorption spectrometry (AAS) and atomic absorption spectrometry (AAS) for liquid sampling. AFS), Inductively Coupled Plasma Emiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/3103
Inventor 毛雪飞钱永忠王敏齐悦涵张英
Owner INST OF QUALITY STANDARD & TESTING TECH FOR AGRO PROD OF CAAS
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