Analytical measurement method for didecyl dimethyl ammonium chloride in seawater

Abstract

The invention discloses an analytical measurement method for didecyl dimethyl ammonium chloride in seawater. The method comprises the following steps of (1) preparing a standard solution of didecyl dimethyl ammonium chloride, charging gradient volumes of standard solution into separating funnels, adding the seawater, a sodium thiosulfate aqueous solution and a color-developing agent solution into each funnel, controlling the pH, and performing shaking uniformizing and complete standing; (2) adding an organic extracting agent into each separating funnel for extraction; (3) extracting an organic layer solution, measuring a light absorption value of the organic layer solution, performing zero adjustment by using the organic extracting agent, and drawing a standard curve by using the organic layer solution as a blank reference solution; (4) measuring the seawater to be measured into the separating funnels, adding the sodium thiosulfate aqueous solution and the color-developing agent solution into the separating funnels, controlling the pH, and performing shaking uniformizing and complete standing; (5) adding the organic extracting agent into each separating funnel for extraction; and (6) extracting an organic layer solution, measuring a light absorption value of the organic layer solution, and calculating the concentration of the didecyl dimethyl ammonium chloride in the seawater according to the standard curve. The method is accurate, reliable and easy to operate.

Description

technical field [0001] The invention relates to a method for analyzing and measuring didecyldimethylammonium chloride in seawater. Background technique [0002] Didecyldimethylammonium chloride is a kind of cationic surfactant, DDAC is one of the third generation products of quaternary ammonium fungicides, which has a strong ability to kill microorganisms and can be used for oilfield water injection and industrial cooling The water system is used as a fungicide and a fungicide. The mechanism of action of this type of fungicide is mainly that cations adsorb negatively charged bacteria through electrostatic force, hydrogen bond force, and hydrophobic binding between surfactant molecules and protein molecules, and gather on the cell wall, resulting in room resistance effect, resulting in The growth of bacteria is inhibited and they die; at the same time, the hydrophobic alkyl group can also interact with the hydrophilic group of microorganisms to change the permeability of the...

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Problems solved by technology

However, this method is not suitable for the trace analysis of quaternary ammonium salts in complex media such as seawater

Experiments show that the absorbance value of the chloroform layer extracted from seawater is extremely unstable when subjected to ultraviolet analysis, and even decays to zero.

In 2010, there was an article published in the second phase of "Physical and Chemical Inspection-Chemistry Volume" "Ultraviolet Spectrophotometry Determination of Quaternary Ammonium Salt Content in Seawater", but the type of quaternary ammonium salt analyzed was not mentioned in the article, and its There is no need to add a chromogenic agent itself to absorb ultraviolet light, but didecyldimethylammonium chloride itself has no ultraviolet absorption in the present invention, and needs to be analyzed after treatment, so when analyzing the content of this agent used in seawater more complicated

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