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Method for selectively and quantitatively collecting and measuring chromium (VI) in aquatic environment

A quantitative acquisition and water environment technology, applied in the measurement of color/spectral characteristics, preparation of test samples, sampling devices, etc. The effect of low detection limit and simple acquisition device

Inactive Publication Date: 2015-02-25
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrochemical analysis method and thin film equilibrium diffusion technology have no enrichment function and cannot measure chromium (VI) content below the detection limit

Method used

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  • Method for selectively and quantitatively collecting and measuring chromium (VI) in aquatic environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Pretreatment of dialysis membrane

[0045] Soak a dialysis membrane (cellulose acetate membrane) with a molecular weight cut-off of 2000-14000 in deionized water and boil, change the water every 20 minutes, and the cumulative boiling time is 2 hours;

[0046] 2) Pretreatment of binders

[0047] Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, weigh 50g of the liquid binder didodecanylamine polyoxyethylene ether diquaternary ammonium salt, dilute it with 80mL of deionized water and put it into the dialysis bag In the bag, soak in deionized water for 168h for purification, and replace the deionized water every 24 hours;

[0048] 3) Installation of acquisition device

[0049] Prepare the purified binding agent into 0.020mol / L didodecanylamine polyoxyethylene ether diquaternary ammonium salt solution, and take 3 collection devices made of polypropylene with a volume of 2mL (such as figure 1As shown), the acquisition device includes a fi...

Embodiment 2

[0058] 1) Pretreatment of dialysis membrane

[0059] Soak a dialysis membrane (cellulose acetate membrane) with a molecular weight cut-off of 2000-14000 in deionized water and boil, change the water every 20 minutes, and the cumulative boiling time is 2 hours;

[0060] 2) Pretreatment of binders

[0061] Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, weigh 40g of the liquid binder didodecylamine polyoxyethylene ether triquaternary ammonium salt, dilute it with 100mL deionized water and put it into the dialysis bag Within 168 hours, soak in deionized water for purification, and replace the deionized water every 12 hours;

[0062] 3) Installation of acquisition device

[0063] Purified binding agent is made into 0.050mol / L didodecylamine polyoxyethylene ether triquaternary ammonium salt solution, and 12 collection devices whose material is polypropylene and volume is 2ml, the collection device structure is the same as embodiment 1; Fill the c...

Embodiment 3

[0072] 1) Pretreatment of dialysis membrane

[0073] Soak a dialysis membrane (cellulose acetate membrane) with a molecular weight cut-off of 2000-14000 in deionized water and boil, change the water every 30 minutes, and the cumulative boiling time is 2 hours;

[0074] 2) Pretreatment of binders

[0075] Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, weigh 20g of the liquid binder polyquaternary ammonium salt, dilute it with 50mL of deionized water and put it into the dialysis bag, soak in deionized water for 120h For purification, replace the deionized water every 24 h;

[0076] 3) Installation of acquisition device

[0077] The binding agent of purification is made into 0.050mol / L polyquaternary ammonium salt solution, gets 12 material and is the collection device that polytetrafluoroethylene volume is 2ml, and this collection device structure is the same as embodiment 1; Pack into 2ml0. .050mol / L polyquaternary ammonium salt solution, se...

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Abstract

A method for selectively and quantitatively collecting and measuring chromium (VI) in aquatic environment comprises the steps of: carrying out pretreatment with a dialysis membrane with molecular cut off of 2000-14000, pretreating a binder, placing a collecting device in the aquatic environment with the dialysis membrane downward, fixing the collecting device, standing for 1-120d, taking out the collecting device once or multiple times, taking out 30-80vol% of the binder, diluting to a certain volume with hydrochloric acid, measuring the accumulation volume of chromium (VI) in the binder, and calculating average concentration of chromium (VI) in water. The method has the advantages that the collecting device is simple, low in cost, convenient for collecting and pollution-free to the environment, so that the concentration of chromium (VI) can be more accurately measured; the concentration of free chromium (VI) in the binder solution is approximate to zero; and the change of an aquatic environment system within a period of time can be more comprehensively reflected.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, in particular to a method for selectively and quantitatively collecting and measuring chromium (VI) in water environment. Background technique [0002] In the natural environment, the common forms of chromium are chromium (III) and chromium (VI). Due to the different valence states, the geochemical properties, biochemical properties and toxicity levels of chromium (III) and chromium (VI) are significantly different. Chromium (VI) exists in the form of anion, has high activity, and its solubility is large, which is very harmful to plants and animals. It has carcinogenic effect and allergic reaction after contact with the skin. However, chromium (III) is one of the essential trace elements for the human body. Its activity is poor, and the absorption rate of chromium (III) by animals and plants is very low. In the human body, chromium (III) is complexed with b-globulin, which is a globulin A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N1/40G01N1/10G01N1/28
Inventor 陈宏刘玉静顾佳丽蔡艳荣励建荣
Owner BOHAI UNIV
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