Method for measuring influence of pH value on removal rate of heavy metal chelant
A technology of heavy metal chelating agent and removal rate, which is used in the preparation of test samples and the measurement of color/spectral properties. The effect of measurement cost and high measurement accuracy
Inactive Publication Date: 2012-05-23
袁俊海
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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
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[0034] A kind of method that the present invention relates to measuring pH value influences on the removal rate of heavy metal chelating agent comprises the following steps:
[0035] (a) preparing a heavy metal chelating agent for use;
[0036] (b) prepare copper ion solutions with different pH values respectively;
[0037] (c) adding heavy metal chelating agent solution;
[0038] (d) After stirring for a period of time at room temperature, take out the supernatant and measure its absorbance;
[0039] (e) Calculate the chelated Cu 2+ amount.
[0040] (f) through Cu 2+ The effect of pH value on the removal rate of heavy metal chelating agent was obtained.
[0041] In the step (b), the pH of the prepared copper ion solution is 2-7.
[0042] In the step (b), the volume of the prepared copper ion solution is 100ml.
[0043] In the step (b), the prepared copper ion solution has a concentration of 50 mg / L.
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Abstract
The invention discloses a method for measuring the influence of a pH value on the removal rate of a heavy metal chelant. The method comprises the steps of: preparing the heavy metal chelant for later use; preparing copper ion solutions with different pH values; adding a heavy metal chelant solution; taking out the supernatant liquors to measure the absorbance after agitation; solving the quantity of chelate Cu<2+>; and obtaining the influence on the removal rate according to the quantity of the chelate Cu<2+>. The method disclosed by the invention can be used for rapidly measuring the influence of the pH value on the removal rate of the heavy metal chelant, has high measurement precision and simple measurement steps, is beneficial to reduction of the measurement cost and provides a good data base for use of the heavy metal chelant.
Description
technical field [0001] The invention relates to a method for measuring the influence of pH value on the removal rate of a heavy metal 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 ...
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IPC IPC(8): G01N21/31G01N1/28
Inventor 袁俊海
Owner 袁俊海