Analytical measurement method for didecyl dimethyl ammonium chloride in seawater

A didecyl dimethyl ammonium chloride, determination method technology, applied in the preparation of test samples, color/spectral property measurement and other directions, can solve the problem of not suitable for micro-analysis of quaternary ammonium salts, without mentioning the type of quaternary ammonium salts , attenuation and other problems, to achieve the effect of accurate and reliable test method, simple, fast and accurate operation, and small relative deviation

Active Publication Date: 2014-04-30
INST OF CHEM ENG GUANGDONG ACAD OF SCI
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  • Abstract
  • Description
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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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  • Analytical measurement method for didecyl dimethyl ammonium chloride in seawater

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preparation example Construction

[0046] In the steps of sample preparation and detection, the seawater to be tested is seawater treated with medication.

[0047] The purpose of the present invention is also just to measure the concentration of didecyldimethylammonium chloride in the seawater treated by dosing.

Embodiment 1

[0050] (1) Draw a standard curve: use seawater as a solvent to prepare a didecyldimethylammonium chloride standard solution with a concentration of 13.36ppm; prepare an aqueous solution of 0.1% acid blue 80 and 0.1mol / L thiosulfuric acid sodium solution. Use a pipette to draw 1, 2, 4, 6, and 8ml of the standard solution into five separatory funnels, add 10ml of seawater, 0.2mL of sodium thiosulfate aqueous solution, and 0.2mL of acid blue, and use acetic acid to control the pH of the solution. 3. After shaking well and standing still for 30 minutes, use a pipette to absorb 10ml of dichloroethane (reagent pure) and add them to five separatory funnels, shake the separatory funnels fully, and fully extract the components to be tested into the organic phase , and then statically layered to obtain solutions with concentrations of 1.336, 2.672, 5.344, 8.016, and 10.688 ppm respectively; respectively take the organic phase into 5 cuvettes. Measure the absorbance value with a UV spec...

Embodiment 2

[0054] (1) Draw a standard curve: use seawater as a solvent to prepare a standard solution of didecyldimethylammonium chloride with a concentration of 10 ppm; prepare an aqueous solution of methyl orange with a mass concentration of 0.1% and thiosulfuric acid of 0.1mol / L sodium solution. Use a pipette to draw 1, 2, 4, 6, and 8ml of the standard solution into five separatory funnels, add 10ml of seawater, 0.2mL of sodium thiosulfate aqueous solution, and 0.2mL of methyl orange, and use acetic acid to control the pH of the solution 3. After shaking well and standing still for 20 minutes, use a pipette to draw 10ml of dichloromethane (reagent pure) into five separating funnels, shake the separating funnels fully, and fully extract the components to be tested into the organic phase. , and then statically layered to obtain solutions with a concentration of 1, 2, 4, 6, and 8 ppm; respectively take the organic phase into 5 cuvettes. Measure its absorbance with a UV spectrophotometer...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N1/28
Inventor 冯璐栾安博黄奇然邱美坚缪飞杨伟和
Owner INST OF CHEM ENG GUANGDONG ACAD OF SCI
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