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Method for determining binding constants of soluble organic carbon with different molecular weights and alkaline-earth metals

A technology for soluble organic carbon and alkaline earth metals, which is applied in measurement devices, analytical materials, color/spectral properties measurement, etc.

Active Publication Date: 2021-01-08
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for determining the binding constants of different molecular weight dissolved organic carbon and alkaline earth metals in view of the problem that the current binding constant determination method is difficult to accurately measure

Method used

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  • Method for determining binding constants of soluble organic carbon with different molecular weights and alkaline-earth metals
  • Method for determining binding constants of soluble organic carbon with different molecular weights and alkaline-earth metals
  • Method for determining binding constants of soluble organic carbon with different molecular weights and alkaline-earth metals

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Experimental program
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Embodiment 1

[0044] Take DOC water samples with a fixed concentration of 3.5mg / kg, molecular weights greater than 100,000, molecular weights of 100,000 to 10,000, molecular weights of 10,000 to 6,000, and molecular weights of less than 6,000 Daltons, and take 60 200ml Erlenmeyer flasks According to the above-mentioned four kinds of water samples with different molecular weights, each 15 parts of 100g were weighed, and they were poured into conical flasks respectively for later use. Take 192.51mg of MgCl 2 Add to 1L deionized water to make 50mg / L Mg 2+ solution, then for 50mg / L Mg 2+ The solution is diluted and configured into different concentrations of Mg 2+ solution to obtain a certain volume of 0, 1, 2, 3, 4, 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50 mg / L of Mg 2+ Solution, take 50ml of each mass concentration and add it into conical flasks with different molecular weights of fixed concentrations and DOC solutions, add 10% dilute hydrochloric acid dropwise, adjust the pH to 7, place ...

example 2

[0046] Take DOC water samples with a fixed concentration of 3.5mg / kg, molecular weights greater than 100,000, molecular weights of 100,000 to 10,000, molecular weights of 10,000 to 6,000, and molecular weights of less than 6,000 Daltons, and take 60 200ml Erlenmeyer flasks According to the above-mentioned four kinds of water samples with different molecular weights, each 15 parts of 100g were weighed, and they were poured into conical flasks respectively for later use. Take 138.73mg of CaCl 2 Add to 1L deionized water to make 50mg / L Ca 2+ solution, then to 50mg / L Ca 2+ The solution is diluted and configured into different concentrations of Ca 2+ solution, to obtain a certain volume of 0, 1, 2, 3, 4, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50mg / L of Ca 2+ Solution, take 50ml of each mass concentration and add it into conical flasks with different molecular weights of fixed concentrations and DOC solutions, add 10% dilute hydrochloric acid dropwise, adjust the pH to 7, place the c...

Embodiment 3

[0048] Take DOC water samples with a fixed concentration of 3.5mg / kg, molecular weights greater than 100,000, molecular weights of 100,000 to 10,000, molecular weights of 10,000 to 6,000, and molecular weights of less than 6,000 Daltons, and take 60 200ml Erlenmeyer flasks According to the above-mentioned four kinds of water samples with different molecular weights, each 15 parts of 100g were weighed, and they were poured into conical flasks respectively for later use. Take 90.46mg of SrCl 2 Add to 1L of deionized water to make 50mg / L of Sr 2+ solution, then for 50mg / L of Sr 2+ The solution was diluted and configured into different concentrations of Sr 2+ solution, to obtain a certain volume of 0,1,2,3,4,5,10,15,20,25,30,35,40,45,50mg / L of Sr 2+ Solution, take 50ml of each mass concentration and add it into conical flasks with different molecular weights of fixed concentrations and DOC solutions, add 10% dilute hydrochloric acid dropwise, adjust the pH to 7, place the conic...

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Abstract

The invention discloses a method for determining binding constants of soluble organic carbon with different molecular weights and alkaline-earth metals, and belongs to a determination method in the field of environmental monitoring. According to the method, the adsorption concentration under the adsorption condition is fitted by taking the concentration of an alkali metal solution as an abscissa,so that the maximum adsorption capacity during adsorption equilibrium is accurately obtained, and then the relationship between the maximum adsorption capacity and the equilibrium concentration is deduced through a kinetic method, so that a Langmuir formula is obtained; and the maximum adsorption capacity and the measured data are fitted into a Langmuir adsorption isotherm to obtain the binding affinity k. The method disclosed by the invention has the advantages that the determining method is more accurate, the accuracy rate can reach 99.5%, and the binding affinity k can be accurately measured. Technical guarantee is provided for reasonably and effectively removing DOC in the water body, and the method is worthy of application and popularization.

Description

technical field [0001] The invention belongs to a measuring method in the field of environmental monitoring, in particular to a measuring method for combining constants of dissolved organic carbon with different molecular weights and alkaline earth metals. Background technique [0002] Dissolved organic carbon (DOC) in water is complex, mainly composed of humus, microbial secretions and synthetic organic matter. DOC itself is a kind of micro-pollutant and the precursor of disinfection by-products in water body. The increase of its content gradually poses a threat to the quality of water environment. Therefore, it is of great scientific significance to study the characteristics and removal mechanism of DOC. [0003] Alkaline earth metal ions can form a bridge between organic matter in the solution due to cationic bridging effect, causing DOC to settle and reduce the content of dissolved organic carbon in water. This is an effective method for removing DOC pairs from water b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/3103
Inventor 蒲晓董雪张玉虎高静许新瑶王子康刘训良张瑞宁
Owner CAPITAL NORMAL UNIVERSITY
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