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A device for rapidly separating and collecting cr(vi) in the field

A fast and field technology, applied in the direction of measuring devices, analysis materials, test sample preparation, etc., can solve the problems of unscientific environmental pollution, lower test accuracy, cumbersome operation steps, etc., achieve low cost and wide application range , Simple and fast operation

Active Publication Date: 2019-11-12
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the great difference in toxicity between Cr(Ⅲ) and Cr(Ⅵ), it is not scientific enough to evaluate the degree of environmental pollution by measuring total chromium. Therefore, it is necessary to give accurate valence information, such as Cr(Ⅵ) content
The traditional separation and detection of Cr(Ⅵ) is mainly through laboratory instrument testing, such as ion chromatography-plasma mass spectrometry (IC-ICP-MS), solid phase extraction separation-atomic spectrometry, etc., all of which have high operating requirements or The cumbersome operation steps cannot solve the problem of reducing the test accuracy due to changes in the valence state of the sample during transportation

Method used

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  • A device for rapidly separating and collecting cr(vi) in the field

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Embodiment 1

[0017] Please refer to figure 1 , The embodiment of the present invention provides a device for rapidly separating and collecting Cr(VI) in the field, including a co-precipitation capsule 1, a sodium hydroxide capsule 2, a test tube 3, a syringe 4, a filter device 5, and a receiving cup 6.

[0018] Nd(NO 3 ) 3 ·6H 2 O, NaOH is housed in the sodium hydroxide capsule 2. In one embodiment, the co-precipitation capsule 1 and the sodium hydroxide capsule 2 are made of tapioca starch.

[0019] The test tube 3 contains samples collected in the field. In one embodiment, the capacity of the test tube 3 is 50 mL.

[0020] The capacity of syringe 4 is 10mL, and the supernatant liquid that described syringe 4 once draws is 5-10mL, and described filter device 5 is connected at the outlet of syringe 4, and filter device 5 is a filter membrane, and the aperture of described filter membrane is preferably is 0.22 μm.

[0021] Open co-precipitation capsule 1 and sodium hydroxide capsule 2,...

Embodiment 2

[0030] Take 20mL surface water sample in 50mL test tube 3, add Cr(Ⅵ) standard liquid 10μgL -1 To simulate field surface water, add 1mgNd(NO 3 ) 3 ·6H 2 O, stir to dissolve, add 20mg sodium hydroxide, let stand for 5min. Use a 10 mL syringe 4 to draw 5 mL of the solution, filter it through a filter membrane with a pore size of 0.22 μm, and collect the filtrate with a receiving cup 6 . Chromium is detected by ICP-MS, which is the Cr(Ⅵ) content. The recovery rate of Cr(Ⅵ) was 92.4%.

Embodiment 3

[0032] Take 20mL drinking water sample in 50mL test tube 3, add Cr(Ⅵ) standard liquid 10μgL -1 To simulate wild drinking water, add 0.1mgNd(NO 3 ) 3 ·6H 2 O, stir to dissolve, add 25mg of sodium hydroxide, let stand for 5min. Draw 5mL of the solution with a 10mL syringe 4, filter through a filter membrane with a pore size of 0.22μm, and collect the filtrate with a receiving cup. Chromium is detected by ICP-MS, which is the Cr(Ⅵ) content. The recovery rate of Cr(Ⅵ) was 94.3%.

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Abstract

The invention discloses a field rapid Cr (VI) separation and collection technique which includes the steps: adding Nd (NO3)3*6H2O into a field acquired sample, stirring mixture, and enabling the sample to dissolve; adding NaOH, co-precipitating Cr (III) in the sample by generated Nd (OH)3, and standing; sucking supernatant liquid by the aid of a syringe; connecting a filtering device at an outletof the syringe, discharging the sucked supernatant liquid from the syringe, and collecting filtering liquid to obtain separated Cr(VI). The invention further discloses a field rapid Cr (VI) separationand collection device. The technique can be used for field on-site separation and collection of the Cr (VI) and effectively solves the problem that measuring accuracy is reduced as chromium valence states are changed in the transportation process of the sample, separation efficiency is high, and separation selectivity is good.

Description

technical field [0001] The invention relates to the field of on-site separation methods of analytical chemistry, in particular to a device for rapidly separating and collecting Cr(VI) in the field. Background technique [0002] Chromium is a common metal element that mainly exists in the form of trivalent chromium and hexavalent chromium, of which Cr(III) is beneficial to the human body, while Cr(VI) is highly toxic. Since the toxicity of Cr(Ⅲ) and Cr(Ⅵ) is very different, it is not scientific enough to evaluate the degree of environmental pollution by measuring total chromium. Therefore, accurate valence information, such as Cr(Ⅵ) content, needs to be given. The traditional separation and detection of Cr(Ⅵ) is mainly through laboratory instrument testing, such as ion chromatography-plasma mass spectrometry (IC-ICP-MS), solid phase extraction separation-atomic spectrometry, etc., all of which have high operating requirements or The cumbersome operation steps cannot solve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N27/62
Inventor 郭伟李凡胡圣虹
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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