Device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment

Abstract

The embodiment of the utility model provides a device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment. The device comprises a base, a cover body, a filtering membrane layer, a diffusion layer, a first adsorption layer and a second adsorption layer, wherein the cover body covers the base to form a cavity; the filtering membrane layer, the diffusion layer, the first adsorption layer and the second adsorption layer are arranged in the cavity; a sample introduction window is formed in the central area of the cover body; the filtering membrane layer is arranged close to the sample introduction window; the diffusion layer is in contact connection with the filtering membrane layer; the first adsorption layer is in contact connection with the diffusion layer and is used for adsorbing trivalent chromium ions in the sample to be detected; the second adsorption layer is in contact connection with the first adsorption layer and is used for adsorbing hexavalent chromium ions in the sample to be detected. The first adsorption layer and the second adsorption layer are arranged and used for adsorbing the trivalent chromium ions and the hexavalent chromium ions in the to-be-detected sample respectively, hexavalent chromium and trivalent chromium in water / soil / sediment are collected and detected at the same time, the detection process is simplified, and the detection efficiency is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present disclosure belongs to the technical field of collection equipment of hexavalent chromium and trivalent chromium, and particularly relates to a device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment. BACKGROUND

[0002] The thin film diffusion gradient technology refers to a technology for quantitatively measuring ion diffusion flux or ion concentration in a medium in situ. The concentration value of an ion is obtained by quantitatively measuring and calculating the ion passing through a diffusion film of a certain thickness within a certain time.

[0003] The existing water / soil / sediment collection and detection device utilizes the thin film diffusion gradient principle and can only detect trivalent chromium or hexavalent chromium. Different adsorption materials need to be replaced for each detection, and the detection process is time-consuming and low in efficiency.

[0004] In view of the above problems, it is necessary to provide a device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment, which is reasonable in design and can effectively improve the above problems. CONTENT OF THE INVENTION

[0005] The embodiment of the present disclosure aims to at least solve one of the technical problems existing in the prior art, and provides a device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment.

[0006] The embodiment of the present disclosure provides a device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment, which comprises a base, a cover body arranged on the base to form a cavity, and a filter membrane layer, a diffusion layer, a first adsorption layer and a second adsorption layer arranged in the cavity; wherein a sample inlet window is arranged in the central region of the cover body.

[0007] The filter membrane layer is arranged close to the sample inlet window.

[0008] The diffusion layer is in contact with the filter membrane layer.

[0009] The first adsorption layer is in contact with the diffusion layer and is used for adsorbing trivalent chromium ions in a to-be-measured sample.

[0010] The second adsorption layer is in contact with the first adsorption layer and is used for adsorbing hexavalent chromium ions in the to-be-measured sample.

[0011] Optionally, the first adsorption layer adopts cation exchange resin.

[0012] Optionally, the second adsorption layer adopts anion exchange resin.

[0013] Optionally, the thickness of the first adsorption layer ranges from 0.4 mm to 2 mm.

[0014] Optionally, the thickness of the second adsorption layer ranges from 0.4mm to 2mm.

[0015] Optionally, the thickness of the diffusion layer ranges from 0.4mm to 2mm.

[0016] Optionally, the filter membrane layer adopts a microporous filter membrane.

[0017] Optionally, the base is provided with a boss structure on the side facing the cover, and the cover is sleeved on the boss structure to form the cavity.

[0018] Optionally, the cross section of the first adsorption layer is circular.

[0019] Optionally, the cross section of the second adsorption layer is circular.

[0020] The device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment according to the embodiments of the present disclosure comprises a base, a cover arranged on the base to form a cavity, and a filter membrane layer, a diffusion layer, a first adsorption layer and a second adsorption layer arranged in the cavity; the central region of the cover is provided with a sample inlet window; the filter membrane layer is arranged close to the sample inlet window; the diffusion layer is in contact with the filter membrane layer; the first adsorption layer is in contact with the diffusion layer and is used for adsorbing trivalent chromium ions in the sample to be measured; and the second adsorption layer is in contact with the first adsorption layer and is used for adsorbing hexavalent chromium ions in the sample to be measured. By arranging the first adsorption layer and the second adsorption layer, trivalent chromium ions and hexavalent chromium ions in the sample to be measured are respectively adsorbed, hexavalent chromium and trivalent chromium in water / soil / sediment are simultaneously collected and detected, the detection process is simplified, and the detection efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a sectional view of a device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment according to one of the embodiments of the present disclosure;

[0022] Figure 2 It is a perspective view of a device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment according to one of the embodiments of the present disclosure. DETAILED DESCRIPTION

[0023] In order for those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below with reference to the drawings and specific embodiments.

[0024] As Figure 1 and Figure 2As shown, the device 100 for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment provided by the embodiment of the present disclosure comprises a base 110, a cover 120 arranged on the base 110 to form a cavity, and a filter membrane layer 130, a diffusion layer 140, a first adsorption layer 150 and a second adsorption layer 160 arranged in the cavity; wherein the central region of the cover 120 is provided with a sample inlet window 121.

[0025] The filter membrane layer 130 is arranged close to the sample inlet window.

[0026] The diffusion layer 140 is in contact with the filter membrane layer 130.

[0027] The first adsorption layer 150 is in contact with the diffusion layer 140 and is used for adsorbing trivalent chromium ions in the sample to be measured.

[0028] The second adsorption layer 160 is in contact with the first adsorption layer 150 and is used for adsorbing hexavalent chromium ions in the sample to be measured.

[0029] Specifically, the sample to be measured of water / soil / sediment is added to the sample inlet window 121, and the sample to be measured is first subjected to preliminary filtration by the filter membrane layer 130. The target ions in the filtered sample to be measured pass through the diffusion layer 140 and form a linear gradient in the diffusion layer 140. The target ions in the sample to be measured passing through the diffusion layer 140 pass through the first adsorption layer 150, and the first adsorption layer 150 adsorbs the trivalent chromium ions in the target ions. The target ions after adsorbing the trivalent chromium ions pass through the second adsorption layer 160, and the second adsorption layer 160 adsorbs the hexavalent chromium ions in the target ions.

[0030] The device for simultaneously collecting and detecting hexavalent chromium and trivalent chromium in water / soil / sediment provided by the embodiment of the present disclosure can adsorb trivalent chromium ions and hexavalent chromium ions in the sample to be measured by arranging the first adsorption layer and the second adsorption layer, so as to simultaneously collect and detect hexavalent chromium and trivalent chromium in water / soil / sediment, simplify the detection process and improve the detection efficiency.

[0031] For example, in the present embodiment, the first adsorption layer 150 adopts cation exchange resin (AG-50). Specifically, the cation exchange resin (AG-50) is dispersed in the inside of the polyacrylamide gel to form the first adsorption layer 150.

[0032] In the present embodiment, the first adsorption layer 150 adopts cation exchange resin, which can better adsorb the trivalent chromium ions in the sample to be measured.

[0033] It should be noted that the first adsorption layer 150 can also adopt other adsorption materials as long as it can adsorb trivalent chromium ions, and the present embodiment is not limited in this regard and can be limited according to actual needs.

[0034] Exemplarily, in the embodiment, the second adsorption layer 160 adopts anion exchange resin (AG-1). Specifically, the anion exchange resin (AG-1) is dispersed in polyacrylamide to form the second adsorption layer 160.

[0035] In the embodiment, the second adsorption layer 160 adopts anion exchange resin, which can better adsorb hexavalent chromium ions in the sample to be measured.

[0036] It should be noted that the second adsorption layer 160 can also adopt other adsorption materials as long as it can adsorb hexavalent chromium ions, and the embodiment is not limited in this regard. The specific thickness of the first adsorption layer 150 can be selected according to the actual needs of the sample to be measured, and the embodiment is not limited in this regard.

[0037] Exemplarily, in the embodiment, the thickness of the first adsorption layer 150 ranges from 0.4mm to 2mm. It should be noted that the specific thickness of the first adsorption layer 150 can be selected according to the actual needs of the sample to be measured, and the embodiment is not limited in this regard.

[0038] Exemplarily, in the embodiment, the thickness of the second adsorption layer 160 ranges from 0.4mm to 2mm. It should be noted that the specific thickness of the second adsorption layer 160 can be selected according to the actual needs of the sample to be measured, and the embodiment is not limited in this regard.

[0039] Exemplarily, in the embodiment, the thickness of the diffusion layer 140 ranges from 0.4mm to 2mm. It should be noted that the specific thickness of the diffusion layer 140 can be selected according to the actual needs of the sample to be measured, and the embodiment is not limited in this regard.

[0040] Exemplarily, in the embodiment, the filter membrane layer 130 can adopt a microporous filter membrane. Of course, the filter membrane layer 130 can also adopt other types of filter membranes, and the embodiment is not limited in this regard. The specific thickness of the filter membrane layer 130 can be selected according to the actual needs of the sample to be measured, and the embodiment is not limited in this regard.

[0041] Exemplarily, as shown in Figure 1 The side of the base 110 facing the cover 120 is provided with a boss structure 111, and the cover 120 is sleeved on the boss structure 111 to form a cavity.

[0042] Exemplarily, as shown in Figure 2 The cross section of the first adsorption layer 150 is circular. The cross section of the second adsorption layer 160 is circular. The cross section of the adsorption layer 140 is circular. The shape of the sample inlet window 121 is also circular.

[0043] Taking water as the sample to be tested as an example, in the experiment of adsorbing ions in water, the amount of the element to be tested adsorbed by the device is M, the experimental time is t, the window area is A, the diffusion coefficient is D, and the ion concentration in the solution is Cb. If the thickness of the diffusion layer is a and the thickness of the first adsorption layer 150 is b, then the amount of trivalent chromium ions adsorbed by the first adsorption layer 150 of the device per unit time is as shown in formula (1):

[0044]

[0045] The amount of hexavalent chromium ions adsorbed by the second adsorption layer 160 is shown in formula (2):

[0046]

[0047] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the embodiments of this disclosure, and the embodiments of this disclosure are not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of this disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of this disclosure.

Claims

1. A device for simultaneously collecting and detecting hexavalent and trivalent chromium in water / soil / sediment, characterized in that, It includes a base, a cover disposed on the base to form a cavity, and a filter membrane layer, a diffusion layer, a first adsorption layer, and a second adsorption layer disposed in the cavity; wherein, a sample inlet window is provided in the central region of the cover; The filter membrane layer is positioned close to the sample inlet window; The diffusion layer is in contact with the filter membrane layer; The first adsorption layer is in contact with the diffusion layer and is used to adsorb trivalent chromium ions in the sample to be tested. The second adsorption layer is in contact with the first adsorption layer and is used to adsorb hexavalent chromium ions in the sample to be tested.

2. The apparatus according to claim 1, characterized in that, The first adsorption layer is made of cation exchange resin.

3. The apparatus according to claim 1, characterized in that, The second adsorption layer is made of anion exchange resin.

4. The apparatus according to any one of claims 1 to 3, characterized in that, The thickness of the first adsorption layer ranges from 0.4 mm to 2 mm.

5. The apparatus according to any one of claims 1 to 3, characterized in that, The thickness of the second adsorption layer ranges from 0.4 mm to 2 mm.

6. The apparatus according to any one of claims 1 to 3, characterized in that, The thickness of the diffusion layer ranges from 0.4 mm to 2 mm.

7. The apparatus according to any one of claims 1 to 3, characterized in that, The filter membrane is a microporous filter membrane.

8. The apparatus according to any one of claims 1 to 3, characterized in that, The base has a boss structure on the side facing the cover, and the cover is fitted onto the boss structure to form the cavity.

9. The apparatus according to any one of claims 1 to 3, characterized in that, The cross-section of the first adsorption layer is circular.

10. The apparatus according to any one of claims 1 to 3, characterized in that, The cross-section of the second adsorption layer is circular.

Images