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Method for determining long-chain cationic surface active agent by tetrasulfo metal phthalocyanine

A surfactant and base metal technology, applied in the field of photometric analysis, can solve problems such as complex operation, and achieve the effects of high recognition, high application potential and high stability

Pending Publication Date: 2022-06-24
XIAMEN UNIV
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  • Claims
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Problems solved by technology

Some of these methods are relatively complicated to operate, and some require the use of a large amount of organic solvents, or the use of large instruments

Method used

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  • Method for determining long-chain cationic surface active agent by tetrasulfo metal phthalocyanine
  • Method for determining long-chain cationic surface active agent by tetrasulfo metal phthalocyanine
  • Method for determining long-chain cationic surface active agent by tetrasulfo metal phthalocyanine

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Embodiment Construction

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] In a 5.0 mL container (plastic centrifuge tube), add water, 300 μL pH 1.0 phosphate broad buffer, and a certain volume of 1.0 × 10 -4 mol / L long-chain cationic surfactant and 60 μL concentration of 1.0×10 -3 mol / L of tetrasulfonickel phthalocyanine solution to make the final volume of 3.0 mL, mix well, place at room temperature for 5 min, scan the absorption spectrum on the spectrophotometer, and measure the absorbance.

[0034] The absorbance of the solution at 625 nm (dimer) is recorded as A 1 , the absorbance at 659nm (monomer) is recorded as A 2 , the absorbance ratio is A=A 1 / A 2 calculate. The absorbance ratio is plotted against the concentration of the cationic surfactant t...

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Abstract

The invention relates to a method for determining a long-chain cationic surfactant by tetrasulfo metal phthalocyanine, which is based on the specific molecular spectral response of a water-soluble metal phthalocyanine compound to a cationic surfactant with more than twelve carbon chains, and the response behaviors are highly similar. The method comprises the following steps: sequentially adding water, a buffer solution, a certain volume of cationic surfactant and a metal phthalocyanine solution into a reaction container, uniformly mixing, standing at room temperature, scanning an absorption spectrum, and measuring absorbance. The method not only can be used for measuring the cationic surfactant with a single component, but also can be used for measuring the total cationic surfactant. The method is high in specificity and simple, convenient and rapid to operate; the detection can be carried out in a complete water phase, so that no organic solvent is needed; the reaction system presents the characteristic blue color of the metal phthalocyanine compound, and is suitable for visual observation.

Description

technical field [0001] The invention relates to the technical field of photometric analysis, in particular to a method for measuring long-chain cationic surfactants by using tetrasulfometallophthalocyanine. Background technique [0002] Positively charged surfactants have some special properties due to their positive charge. Clothes fibers themselves have negative charges, and after repeated washing, they will feel rough, but adding a softener containing cationic surfactants during washing reduces friction between fibers due to the adsorption of surfactants by clothing fibers. Makes clothes soft and fluffy. Cationic surfactants can be adsorbed on the surface of negatively charged bacteria, thereby changing the permeability of the bacterial cell wall, changing the components in the bacteria and having the function of sterilization. Surfactants are also used as metal corrosion inhibitors, supercritical carbon dioxide additives, skin care additives, biocides, water treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/31G01N21/01
Inventor 李东辉张艳黄萍邓雅斌
Owner XIAMEN UNIV
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