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 he

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
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Effect test

Example Embodiment

[0051] Example 1

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

[0053] (2) Add a sample of the simulated laundry detergent to be measured (where the content of EDTA is 10ng / g) into the potassium bicarbonate aqueous solution, the volume ratio of the laundry detergent to the potassium bicarbonate aqueous solution is 1:3, and then the temperature is 45°C. Stir at temperature for 15 minutes, filter while it is hot and cool to room temperature naturally to obtain the pretreatment liquid;

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

[0055] (4) Add FeCl to the ionic liquid phase obtained above 3 (The mass-...

Example Embodiment

[0062] Example 2

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

[0064] (2) Add the ionic liquid shown in Table 1 above 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, then Centrifuge and discard the water phase to obtain the ionic liquid phase;

[0065] (3) Add FeCl to the ionic liquid phase obtained above 3 (The mass-volume ratio between the phase and the ionic liquid phase is 1:45g / ml). After fully mixing, the gel column chromatography is applied to Superose12 column chromatography for separation, and firstly washed with n-hexane (the washing flow rate of n-hexane is every Hours 5 times the column volume...

Example Embodiment

[0073] Example 3

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

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

[0076] (3) Add FeCl to the pretreatment solution obtained above 3 (The ratio of mass to volume of the pretreatment liquid is 1:22.5g / ml), after fully mixing, the gel column chromatography Superose12 column chromatography is used for separation, and the first is flushed with n-hexane (the flushing flow rate of n-hexane is 5 times the column volume per hour), the washing time is 25 mi...

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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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