Method for carrying out in-situ sampling and detection on available metal based on DGT-XRF combined technology

A combined technology, effective state technology, used in material analysis, measurement devices, surface/boundary effects, etc. using wave/particle radiation, which can solve the reduction of portable XRF measurement accuracy, trace element accuracy requirements, and easy contamination of XRF probes, etc. problems, to achieve the effect of rapid measurement, short time consumption, wide environmental range and low cost

Pending Publication Date: 2022-08-09
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Application Information

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Problems solved by technology

Traditional portable XRF is mostly used in the measurement of soil and water sediment samples, but the measurement accuracy cannot meet the accuracy requirements of trace elements, and concentrate samples generally have the characteristics of easy adsorption, which is very easy to contaminate the XRF probe, resulting in the accuracy of portable XRF measurement. Further decrease

Method used

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  • Method for carrying out in-situ sampling and detection on available metal based on DGT-XRF combined technology
  • Method for carrying out in-situ sampling and detection on available metal based on DGT-XRF combined technology
  • Method for carrying out in-situ sampling and detection on available metal based on DGT-XRF combined technology

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Experimental program
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Embodiment 1

[0038] Based on DGT-XRF combined technology, the in situ sampling and detection method of effective metal metals is used to monitor the on-site monitoring of river pollution water bodies that occur in black and odorous, which includes the following steps:

[0039] S1. Preparation of DGT devices: This device has improved compared with the standard DGT device. It is not compared with the diffusion film. It consists of two layers of membranes of Zro-Chelex fixed membrane and PVDF filter membrane, which shorten the target element absorbed by the fixed membrane absorption The path, the fluorescent signal that enhances XRF analysis without affecting the DGT determination;

[0040]S2. Preparation of indoor standard sample film: Establish a standard curve of multiple heavy metal elements. Put the DGT device of the above steps S1 into the mixed solution of a variety of metal solutions of different concentration gradients for enrichment. Under the same concentration, one of the DGTs can be ...

Embodiment 2

[0050] Based on DGT-XRF combined technology, the in situ sampling and detection method of effective metal metal is used to monitor the in situ of the soil in situ in place of the contaminated venue.

[0051] S1. Preparation of DGT devices: This device has improved compared with the standard DGT device. It is not compared with the diffusion film. It consists of two layers of membranes of Zro-Chelex fixed membrane and PVDF filter membrane, which shorten the target element absorbed by the fixed membrane absorption The path, the fluorescent signal that enhances XRF analysis without affecting the DGT determination;

[0052] S2. Preparation of indoor standard sample film: Establish a standard curve of multiple heavy metal elements. Put the DGT device of the above steps S1 into the mixed solution of a variety of metal solutions of different concentration gradients for enrichment. Under the same concentration, one of the DGTs can be determined by XRF to obtain the fluorescent signal value...

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Abstract

The invention discloses a method for carrying out in-situ sampling and detection on effective state metals based on a DGT-XRF combined technology, and the effective state concentration of metals/metalloids in polluted water and soil is quantitatively obtained by combining DGT and portable XRF technologies. The method comprises the following specific steps: putting a ZrO-ChelexDGT device into a polluted water body or soil in situ, standing for 8-48 hours, synchronously enriching multiple metal elements, taking out DGT, cleaning water and soil left on the surface, and directly measuring by using a portable XRF (X-ray fluorescence) to obtain signal intensity values of the multiple metal elements on the DGT film. And performing correction according to a pre-calibrated linear curve of the indoor standard sample to obtain the effective state concentration of the metal in the water body or the soil at the sampling point. The invention relates to the technical field of environment monitoring. The method for carrying out in-situ sampling and detection on the available metal based on the DGT-XRF combined technology is simple to operate, high in sensitivity and high in analysis speed, and can realize rapid in-situ monitoring of various metal elements in polluted water areas and soil.

Description

Technical field [0001] The invention involves the field of environmental monitoring technology, which is specifically to sampling and detection of effective metal metals based on DGT-XRF combined technology. Background technique [0002] DiffusiveGradientsinThinFilms (DGT) technology is based on the principle of FICK's first rhythmic ion diffusion. Through the research of the gradient diffusion and association process of target ions, the concentration of ions in the environmental medium with water. The device of the DGT measurement technology consists of a fixed layer and a diffusion layer superimposed. The ions pass through the diffusion layer by diffusion, and then captured by the fixed layer. The linear gradient distribution is formed on the diffusion layer. , Concentration of contact with the medium (C DGT )for: [0003] [0004] The accumulation of ions on the fixed membrane in the upper formula (molcm -2 ), ΔG is the thickness of the diffusion layer (CM), DG is the diffus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/223G01N13/00
CPCG01N23/223G01N13/00G01N2013/003Y02A20/20
Inventor 王燕杭小帅周莉尤晓慧张澜朱冬冬
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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