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Online cadmium separation and enrichment device and rapid cadmium detection method

A separation, enrichment and detection method technology, applied in the field of analytical chemistry, can solve problems such as limitation, low capture rate, powerlessness, etc., and achieve the effect of improving capture efficiency and detection sensitivity

Pending Publication Date: 2021-03-16
BEIJING ABILITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first two methods are only a remedy for the existing technology, and it is difficult to fundamentally solve the matrix interference, so they can only detect simple samples less than 10mg, such as water samples and soil
However, it is often powerless for more complex samples such as food
The last method was proposed by Liu et al. The tungsten wire is used to selectively enrich the Cd evaporated by electrothermal on-line, so that the matrix and Cd can be separated, and then the trapped Cd is released by heating the tungsten wire, which can be analyzed by atomic spectroscopy in the absence of a matrix. This method can effectively detect Cd in food samples of about 20 mg or less; however, due to the loose structure and small surface area of ​​the tungsten wire, the capture rate is low, which is not conducive to the detection of low-content samples; On the one hand, since tungsten and cadmium belong to the same metal element, it is difficult to separate Cd from tungsten wire through a simple chemical process. Only by heating the tungsten wire at high temperature and using the boiling point of the element to release cadmium, only atomic spectroscopy or inorganic mass spectrometry can be used. Follow-up detection, these complicated processes make its application in on-site detection greatly limited

Method used

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  • Online cadmium separation and enrichment device and rapid cadmium detection method
  • Online cadmium separation and enrichment device and rapid cadmium detection method
  • Online cadmium separation and enrichment device and rapid cadmium detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] After drying and ashing 0.2mL of cadmium-containing wastewater sample, heat it to 600-1000°C in 200mL / min nitrogen and keep it for 5min to evaporate the cadmium; at the same time, mix it with 30mL / min air at the outlet of the evaporator After the discharge is captured in the cylindrical dielectric barrier discharge area, the cylindrical outer dielectric layer is made of glass material, and the linear inner electrode is made of graphite material; after the capture, the dielectric barrier discharger is fed with 500mL / min After purging with hydrogen / argon gas for 2 minutes, discharge again to release cadmium from the dielectric barrier discharge device, and at the same time be excited to emit a characteristic spectrum. The characteristic spectral line of cadmium is detected by atomic emission spectrometer to realize the rapid quantification of cadmium. The detection limit of this method can reach 0.1ng / mL, the relative standard deviation of repeated measurements is less tha...

Embodiment 2

[0045] After drying and ashing 0.1g of cadmium-containing rice sample, heat it to 600-1000°C in 600mL / min argon and keep it for 5min to evaporate the cadmium; Oxygen 50% oxygen / argon mixed gas is mixed and passed into the parallel plate dielectric barrier discharge area for discharge capture, one of the dielectric layers is made of alumina ceramic material, and the other dielectric layer is made of aluminum nitride material; after capture, the dielectric barrier discharger Inject 800mL / min hydrogen / argon mixed gas containing 5% hydrogen to purge for 2min, then discharge again to release cadmium from the dielectric barrier discharger, and the released cadmium is carried by the carrier gas into the atomic absorption spectrometer to realize the rapid quantification of cadmium . The detection limit of this method can reach 0.05ng / g, the relative standard deviation of repeated measurements is less than 10%, the standard recovery rate of the sample is between 85% and 110%, and the d...

Embodiment 3

[0047] After drying and ashing 0.2g of cadmium-containing soil sample, heat it to 600-1000°C in 1L / min hydrogen / argon gas mixture containing 2% hydrogen and keep it for 5min to evaporate the cadmium; The outlet of the device is mixed with 20mL / min of oxygen and then passed into the parallel line dielectric barrier discharge area for discharge and capture, in which the cylindrical dielectric layer is made of zirconia ceramic material; after capture, the dielectric barrier discharger is passed into 1L / min of 5% hydrogen After purging with hydrogen / argon gas for 2 minutes, discharge again to release cadmium from the dielectric barrier discharger, and the released cadmium is carried by the carrier gas into the atomic fluorescence spectrometer to realize the rapid quantification of cadmium. The detection limit of this method can reach 0.02ng / g, the relative standard deviation of repeated measurements is less than 10%, the standard recovery rate of the sample is between 85% and 110%,...

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Abstract

The invention discloses an online cadmium separation and enrichment device and a rapid cadmium detection method, and relates to the field of analytical chemistry. The device comprises an evaporator, amixer and a dielectric barrier discharger which are connected in sequence, wherein an electric heating evaporation component is arranged in a cavity of the evaporator, and an inlet for introducing inert or reducing gas is formed in the wall of the cavity; the electric heating evaporation component is used for containing a cadmium-containing object to be detected and carrying out electric heatingevaporation on the cadmium-containing object to be detected; an inlet for introducing oxidizing gas is formed in the mixer; and the dielectric barrier discharger comprises a negative electrode, a positive electrode and a cavity located between the negative electrode and the positive electrode, and captures the cadmium element through discharging. According to the method, the device is used for rapidly separating and capturing the cadmium element in the to-be-detected object, and then the content of the cadmium element is determined.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to an on-line separation and enrichment device for cadmium and a rapid detection method for cadmium. Background technique [0002] Cadmium (Cd) is a metal element with high toxicity. In recent years, due to human activities such as mining, cadmium has diffused into the soil and water systems, causing food pollution such as grains and vegetables, and seriously endangering human health. . In order to understand the pollution status and determine the effect of treatment, it is necessary to detect the cadmium in these samples. The current cadmium detection technology is mainly carried out in the laboratory. The digestion of the sample makes the sample inorganic and transfers to the liquid phase; then detects the cadmium in the solution by large-scale atomic spectroscopy or inorganic mass spectrometry; finally calculates the cadmium content in the sample. This process takes several ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N1/40G01N1/34G01N21/67G01N21/64G01N21/31G01N21/78G01N21/75
CPCG01N1/34G01N1/40G01N1/44G01N21/3103G01N21/6404G01N21/67G01N21/75G01N21/78G01N2001/4038
Inventor 刘霁欣那星黄旭东吴楠赵亚博柴一丁
Owner BEIJING ABILITY TECH CO LTD