Method for quantification collecting heavy metal cations in water environment

A technology for quantitative collection and heavy metals, applied in the preparation of test samples, sampling devices, etc., can solve the problems of high detection limit, destroying solution balance, affecting the chemical form distribution of heavy metals, etc., and achieves a simple collection device and low detection limit. Effect

Inactive Publication Date: 2012-12-26
BOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spectrophotometry, atomic spectroscopy, electrochemical voltammetry, etc. are not in-situ sampling and measurement. The sampling process and sample treatment destroy the balance of the solution and affect the chemical form distribution of heavy metals in the sample. The measurement results are difficult to reflect the water environment. actual form of existence
The ion-selective electrode only responds to specific free metal ions. It can measure the ion content in the solution in situ by potentiometric measurement without destroying the solution balance. It has the advantages of fast, sensitive, and simple equipment. The disadvantage is that the detection limit is relatively low. High, the concentration of ions in most water environmental samples is below its response range, which limits the application of this method

Method used

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  • Method for quantification collecting heavy metal cations in water environment

Examples

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Effect test

Embodiment 1

[0039] 1) Take a cellulose acetate membrane with a molecular weight cut-off of 2000-12000 as a dialysis membrane, soak it in deionized water and boil to pretreat the cellulose acetate membrane, change the water every 20 minutes, and the cumulative boiling time is 2 hours;

[0040] 2) Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, put the binder water-soluble polyaspartic acid into the dialysis bag, soak in deionized water for 72 hours for purification, and change the water every 12 hours;

[0041] 3) Make the purified binder into a 0.005mol / L water-soluble polyaspartic acid solution, and take 3 collection devices made of polypropylene with a volume of 2mL, such as figure 1 As shown, the acquisition device includes a fixed plate 1, on which a shell 2 with an inner edge is provided, a support body 3 is arranged in the shell 2, and a The dialysis membrane 4 is provided with an inverted tapered groove 301 on the support body 3, and the groove 301 ...

Embodiment 2

[0043] 1) Take a cellulose acetate membrane with a molecular weight cut-off of 2000-12000 as a dialysis membrane, soak it in deionized water and boil to pretreat the dialysis membrane, change the water every 20 minutes, and the cumulative boiling time is 1 hour;

[0044] 2) Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, put the binder water-soluble polyaspartic acid into the dialysis bag, soak in deionized water for 168 hours for purification, and change the water every 24 hours;

[0045] 3) Make the purified binder into a 0.005mol / L water-soluble polyaspartic acid solution, and take 3 collection devices made of polypropylene with a volume of 2mL. The structure of the collection devices is the same as in Example 1; 2mL 0.005mol / L water-soluble polyaspartic acid solution, seal the device with the cellulose acetate membrane pretreated in step 1), put the device dialysis membrane down, hang it on the support and float on the surface containing Cu ...

Embodiment 3

[0047] 1) Take a cellulose acetate membrane with a molecular weight cut-off of 2000-12000 as a dialysis membrane, soak it in deionized water and boil to pretreat the dialysis membrane, change the water every 30 minutes, and the cumulative boiling time is 3 hours;

[0048] 2) Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, put the binder water-soluble polyaspartic acid into the dialysis bag, soak in deionized water for 108 hours for purification, and change the water every 18 hours;

[0049] 3) Make the purified binder into a 0.020mol / L water-soluble polyaspartic acid solution, and take 12 collection devices made of polypropylene with a volume of 2mL. The structure of the collection devices is the same as in Example 1; 2mL 0.020mol / L water-soluble polyaspartic acid solution, seal the device with the cellulose acetate membrane pretreated in step 1), put the device dialysis membrane down, hang it on the support and float on the 2+ In the water bod...

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Abstract

Provided is a method for quantification collecting heavy metal cations in water environment. The steps includes pre-treating dialysis membranes, pre-treating water-soluble poly-aspartic acid binding agents, placing collecting devices containing the binding agents in the water environment, the dialysis membranes is downward in placement, and fixing the collecting devices, storing the collecting devices for 1-120 days, and taking out and detecting the collecting devices; taking out the binding agents gathered with the heavy metal cations in every collecting device by 50%-80% of the volume of the whole volume, fixing volume by hydrochloric acid so as to detect accumulation volume of the heavy metal cations in the binding agents, and calculating density of the heavy metal cations in the water environment. The method has the advantages of using the collecting devices for sampling in original positions, being simple in the collection devices, having a gathering function, actually reflecting substantial existence states through detecting results, being low in detecting limit, and capable of detecting ultra-trace heavy metal cations, having no pollution to the environment, and being capable of completely reflecting change of a water environment system in a certain period.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, in particular to a method for quantitatively collecting heavy metal cations in a water environment. Background technique [0002] In recent years, my country's industry has developed rapidly, and the accompanying pollution problems have become increasingly prominent, among which the hazards of heavy metals are the most common. The biological toxicity of heavy metals is not only related to their total amount, but also depends on their morphological distribution to a greater extent. Heavy metals in the water environment mainly exist in the form of free metal ions and inorganic or organic complexes, and also include a part of the form combined with suspended particles or colloids. The distribution of heavy metals among the free state, complexed state and adsorption-bound state will greatly affect the migration, transformation and bioavailability of heavy metals in each environmental phase, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/10G01N1/40
Inventor 陈宏励建荣马占玲白凤翎包德才
Owner BOHAI UNIV
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