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Method for selectively and quantitatively collecting Cd in water environment

A technology for quantitative collection and water environment, which is applied in the direction of testing water, material inspection products, etc., to achieve the effects of saving manpower and material resources, simple collection devices, and economical and practical methods.

Inactive Publication Date: 2015-06-03
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the existing manual sampling methods, the present invention provides a method for selectively and quantitatively collecting Cd in the water environment, controlling the exchange process of Cd through an inert semi-permeable membrane or hydrogel, and utilizing the specificity for Cd Molecularly imprinted polymers with selective binding and enrichment to realize unidirectional diffusion of Cd, so as to achieve quantitative collection of Cd in water environment

Method used

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  • Method for selectively and quantitatively collecting Cd in water environment

Examples

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Effect test

Embodiment 1

[0034] Using 100 mg of molecularly imprinted polymer, put it in the collection device together with the dialysis membrane, seal the collection device with cellulose film, and then put 36 identical collection devices in the natural freshwater environment for 1 year, every Three samples were taken out every month (calculated as 30 days), and the concentration of Cd in the water was measured by atomic absorption spectrometry, and the average concentration of Cd in the water system during the storage time was calculated.

[0035] At the same time, the conventional sampling method was used to take water samples every three days to measure the concentration of Cd by atomic absorption spectrometry. During the monitoring period, the average concentration of Cd measured by the present invention and the ratio of the Cd content measured by conventional methods in the same period are in the range of 85%-120%, which shows that the present invention can accurately monitor Cd pollution or con...

Embodiment 2

[0037] Using 80 mg of molecularly imprinted polymer, put it together with chromatographic paper in the collection device, seal the collection device with cellulose film, and then put 30 identical collection devices in the natural mineralized water system for 10 months, Take out 3 samples every month (according to 30 days), use the atomic absorption spectrometry to measure the concentration of Cd, and calculate the average concentration of Cd in the water system during the storage time, and use the conventional sampling method to take a sample of the water every three days The concentration of Cd in water samples was determined by atomic absorption spectrometry.

[0038] During the monitoring period, the average concentration of Cd measured by the present invention and the ratio of the Cd content measured by conventional methods in the same period are in the range of 85%-120%, which shows that the present invention can accurately monitor Cd pollution or contain Cd in the water s...

Embodiment 3

[0040] Use 50 mg of molecularly imprinted polymer, put it together with the dialysis membrane in the collection device, seal the collection device with cellulose film, put 12 identical collection devices in the sewage, leave it for 1 month, and take it out every week 3, use atomic absorption spectrometry to measure the concentration of Cd, and calculate the average concentration of Cd in the water system during the storage time, and use the conventional sampling method to take water samples from the water area every three days and use atomic absorption spectrometry to determine the concentration of Cd concentration.

[0041] During the monitoring period, the average concentration of Cd measured by the present invention and the ratio of the Cd content measured by conventional methods in the same period are in the range of 85%-120%, which shows that the present invention can accurately monitor Cd pollution or contain Cd in the water system Cd content.

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Abstract

The invention belongs to the field of environmental monitoring, and specifically provides a method for selectively and quantitatively collecting Cd in the water environment. The essentials are as follows: 1 to 100mg of molecular imprinted polymers with specific selective combining for Cd are placed in a collecting device together with a semipermeable membrane or hydrogel; the collecting device is sealed through a cellulose film and then is placed in the water environment for 1 hour to 1 year; the device is taken out, the concentration of arsenic is determined, and the average concentration of Cd in the waterbody within the period of placement is calculated. The method of the invention is economical and practical; the collecting device is simple, so that manual work is reduced greatly, and both manpower and material resources are saved; and therefore, the method is an effective supplement and perfection for the sample mode for existing manual collecting environment systems.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, and in particular relates to a method for selectively and quantitatively collecting Cd in a water environment. Background technique [0002] Cd is a toxic heavy metal, which is widely used in the fields of electroplating industry, chemical industry, electronics industry and nuclear industry, among which Cd 2+ , Cd(OH) 1+ and CdCl 4 2- etc. are common cadmium polluting wastes in industrial production. Cd is not an essential element for the human body. Cd in the human body is absorbed from the external environment after birth. It enters the body and accumulates through food, water and air. Long-term inhalation of Cd can cause chronic poisoning and kidney damage. Cd pollution in water mainly comes from surface runoff and industrial wastewater. The wastewater discharged from pyrite ore to produce sulfuric acid and phosphate rock to produce phosphate fertilizer contains relatively high Cd, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/18
Inventor 孙挺唐世荣董佳宋宁宁范洪涛
Owner NORTHEASTERN UNIV LIAONING
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