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.
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[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-...
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[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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