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Method for detecting EDTA (ethylene diamine tetraacetic acid) in laundry detergent

A detection method and technology for laundry detergent, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as environmental hazards, and achieve the effect of improving recovery rate, good application potential and prospects, and achieving maximization and optimization.

Inactive Publication Date: 2015-01-07
CHINA CERTIFICATION & INSPECTION GRP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As mentioned above, EDTA can form water-soluble complexes with heavy metal ions, which can cause serious potential harm to the environment

Method used

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  • Method for detecting EDTA (ethylene diamine tetraacetic acid) in laundry detergent
  • Method for detecting EDTA (ethylene diamine tetraacetic acid) in laundry detergent
  • Method for detecting EDTA (ethylene diamine tetraacetic acid) in laundry detergent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Get 25ml of potassium bicarbonate aqueous solution of 0.03mol / L, add deionized water to 50ml, and adjust pH to be 5, thereby obtain potassium bicarbonate aqueous solution;

[0053] (2) Add the simulated laundry liquid sample to be determined (wherein the content of EDTA is 10ng / g) into the potassium bicarbonate aqueous solution, the volume ratio of the laundry liquid to the potassium bicarbonate aqueous solution is 1:3, and then Stir at high temperature for 15 minutes, filter while hot, and naturally cool to room temperature to obtain a pretreatment solution;

[0054] (3) Add the ionic liquids shown in the following table 1 to the pretreatment liquid obtained above, the volume ratio of the pretreatment liquid to the added ionic liquid is 1:2, shake and extract at 30°C for 15 minutes, and then Centrifuge, discard the aqueous phase, and obtain the ionic liquid phase;

[0055] (4) Add FeCl to the ionic liquid phase obtained above 3 (Its mass volume ratio with ionic l...

Embodiment 2

[0063] (1) Add the simulated laundry liquid sample I to be determined (the content of EDTA is 10ng / g) into water, the volume ratio of laundry liquid to water is 1:3, then stir at 45°C for 15 minutes, and Naturally cool to room temperature after filtering to obtain the pretreatment liquid;

[0064] (2) Add the ionic liquids shown in the above table 1 to the pretreatment liquid obtained above, the volume ratio of the pretreatment liquid to the added ionic liquid is 1:2, shake and extract at 30 ° C for 15 minutes, and then Centrifuge, discard the aqueous phase, and obtain the ionic liquid phase;

[0065] (3) Add FeCl to the ionic liquid phase obtained above 3 (Its mass volume ratio with ionic liquid phase is 1:45g / ml), after fully mixing, go up gel column chromatography Superose12 column chromatography and separate, wash with normal hexane earlier (the flushing flow rate of described normal hexane is every 5 times the column volume per hour), the washing time is 25 minutes, and...

Embodiment 3

[0074] (1) Get 25ml of potassium bicarbonate aqueous solution of 0.03mol / L, add deionized water to 50ml, and adjust pH to be 5, thereby obtain potassium bicarbonate aqueous solution;

[0075] (2) The simulated laundry liquid sample I to be measured (wherein the content of EDTA is 10ng / g) is added in the described potassium bicarbonate aqueous solution, and the volume ratio of laundry liquid and potassium bicarbonate aqueous solution is 1:3, then at 45 Stir at ℃ for 15 minutes, filter while hot and cool to room temperature naturally to obtain the pretreatment solution;

[0076] (3) Add FeCl to the pretreatment solution obtained above 3 (Its mass volume ratio with pretreatment liquid is 1:22.5g / ml), after fully mixing, upper gel column chromatography Superose12 column chromatography separates, flushes with normal hexane earlier (the flushing flow rate of described normal hexane is 5 times of column volume per hour), the washing time is 25 minutes, then carry out gradient elutio...

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Abstract

The invention relates to a method for detecting EDTA (ethylene diamine tetraacetic acid) in a laundry detergent. The method comprises steps as follows: (1) preparing a potassium bicarbonate aqueous solution; (2) adding the to-be-detected laundry detergent to the potassium bicarbonate aqueous solution, stirring the solution at the temperature of 45-50 DEG C for 10-20 min, filtering the solution while the solution is hot, and naturally cooling the solution to the room temperature to obtain a pretreated solution; (3) adding an iron liquid to the pretreated solution, performing oscillating extraction and then centrifugation, and removing an aqueous phase to obtain an ion liquid phase; (4) adding trivalent iron salt to the ion liquid phase, after full and even mixing, performing chromatography separation with a gel column chromatography Superose 12 column, performing washing with n-hexane firstly, then performing gradient elution with a petroleum ether-normal propyl alcohol mixed solvent serving as an eluent, and collecting the eluent; (5) evaporation the solvent of the eluent until the solvent is almost dry, and performing dissolution, volume determination and filtration with an organic membrane to obtain a detection sample; (6) performing liquid chromatography separation on the to-be-detected sample to determine the content. The method is excellent in EDTA quantitation accuracy, and a new detection means is provided for control on the content of the EDTA in the laundry detergent.

Description

technical field [0001] The invention relates to a method for detecting substances with limited content in laundry detergent, more particularly to a method for detecting EDTA in laundry detergent, and belongs to the field of detection and analysis of environmental pollution components in laundry detergent. Background technique [0002] The chemical substance EDTA (ethylenediaminetetraacetic acid) has a wide range of uses, and can be used as a bleaching and fixing solution for color photosensitive material processing, dyeing auxiliaries, fiber processing auxiliaries, cosmetic additives, blood anticoagulants, detergents, stabilizers , synthetic rubber polymerization initiators, etc., which have broad application prospects and industrial potential in many fields. [0003] In addition to the above uses, EDTA is also a representative substance in the field of chelating agents, which can form stable water-soluble complexes with various metals such as alkali metals, rare earth eleme...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 傅科杰邬蓓蕾林振兴傅丹华叶佳楣
Owner CHINA CERTIFICATION & INSPECTION GRP NINGBO
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