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Method for measuring absorbance of hydroxamic acid type high-molecular chelating agent

A polymer chelating agent and measurement method technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as narrow molecular weight distribution, limited molecular chain growth, low molecular weight of products, etc., and achieve simple measurement steps, rapid measurement, and high measurement accuracy Effect

Inactive Publication Date: 2012-05-23
袁俊海
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Problems solved by technology

Because the organic solvent used in the precipitation polymerization process is a very active chain transfer agent for the polymerization of acrylamide, and most organic solvents are precipitation agents for polyacrylamide. When the molecular chain of the polymer grows to a certain length, it will It will precipitate and limit the further growth of the molecular chain, so the molecular weight of the obtained product is low and the molecular weight distribution is narrow

Method used

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Embodiment

[0035] The absorbance measuring method of a kind of hydroxamic acid type macromolecule chelating agent that the present invention relates to comprises the following steps:

[0036] (a) Pipette the supernatant in a separatory funnel, then add ammonium citrate solution, thymol blue, and add ammonia water dropwise until the color of the indicator turns blue;

[0037] (b) Then drop nitric acid until the solution turns green, then immediately add the dithizone solution with a graduated cylinder and vibrate vigorously;

[0038] (c) After stratification after standing still, move the dithizone phase into the second separatory funnel, then add 5mL of 0.005% dithizone solution to the first separatory funnel, shake for 30 seconds, and form a mixture after standing still. After layering, transfer this dithizone phase to the second separatory funnel as well;

[0039] (d) Repeat the steps above until the dithizone phase after shaking is the same as the green color of dithizone itself;

...

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Abstract

The invention discloses a method for measuring the absorbance of a hydroxamic acid type high-molecular chelating agent, comprising the following steps: removing a supernatant and adding an ammonium citrate solution until turning blue; then adding nitric acid dropwisely until the solution turns into green, adding a dithizone solution, and violently shaking; repeating the above steps until the green of the dithizone phase after shaking is the same with the green of dithizone itself; accurately adding a dithizone solution, using water as a reference, measuring the absorbance at a position of 510 mm. According to the invention, the absorbance of the hydroxamic acid type high-molecular chelating agent can be rapidly measured, the precision of the measurement is high, the measurement steps are simple, and the labor cost and time cost are reduced.

Description

technical field [0001] The invention relates to an absorbance measuring method of a hydroxamic acid type polymer chelating agent. Background technique [0002] Facing the current situation of my country's environmental protection and the pressure brought by the international green fortress, it is very urgent to carry out the development and research of oilfield environmental protection technology in my country and solve the major environmental protection problems that plague my country's social and economic development. [0003] In the process of oil and gas exploration and development, oil and gas companies have adopted a large number of measures such as drilling and other oil and gas wells to put into production and increase production, resulting in a large amount of drilling sewage. During drilling, each well produces 400-500m of drilling sewage 3 , waste drilling fluid 500~700m 3 . At present, solving the pollution problem of sewage has become one of the important rese...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 袁俊海
Owner 袁俊海
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