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A kind of assay method of EDTA content in detergent

A determination method and technology for detergents are applied in the field of determination of EDTA content in detergents, which can solve problems such as contamination of liquid chromatography columns and liquid chromatography instrument systems, and achieve improved detection accuracy and low quantitative detection limit. , the effect of reducing the detection limit

Active Publication Date: 2020-12-29
WALCH GUANGZHOU COMMODITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this patent is that ionic liquids are inevitably used, and these ionic liquids will cause contamination of liquid chromatography columns and liquid chromatography instrument systems

Method used

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  • A kind of assay method of EDTA content in detergent
  • A kind of assay method of EDTA content in detergent
  • A kind of assay method of EDTA content in detergent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The assay method of EDTA content in dish soap comprises the following steps:

[0029] S1. Prepare EDTA standard stock solution, accurately weigh 0.1g of ethylenediaminetetraacetic acid standard product, accurate to 0.0001g, put it in a 100mL volumetric flask, add ultrapure water to the scale to constant volume to obtain EDTA with a mass concentration of 1000mg / L Standard stock solution;

[0030] S2. Prepare EDTA standard working solution, take 1mL, 0.5mL, 0.2mL, 0.1mL, 0.01mL EDTA standard stock solution in 100mL volumetric flask, dilute with ultrapure water to the scale constant volume, shake well, and ultrasonic for 10 minutes to obtain EDTA standard working solution;

[0031] S3. Weigh 0.2g of the detergent sample to be tested in a stoppered scale test tube, add 5mL of ultrapure water to completely dissolve the detergent sample to obtain a detergent sample solution, turn on the infrared radiation heater and heat up to 300°C, and the detergent Place the detergent sa...

Embodiment 2

[0035] The assay method of EDTA content in dish soap comprises the following steps:

[0036] S1. Prepare EDTA standard stock solution, accurately weigh 0.1g of ethylenediaminetetraacetic acid standard product, accurate to 0.0001g, put it in a 100mL volumetric flask, add ultrapure water to the scale to constant volume to obtain EDTA with a mass concentration of 1000mg / L Standard stock solution;

[0037] S2. Prepare EDTA standard working solution, take 1mL, 0.5mL, 0.2mL, 0.1mL, 0.01mL EDTA standard stock solution in 100mL volumetric flask, dilute with ultrapure water to the scale constant volume, shake well, and ultrasonic for 10 minutes to obtain EDTA standard working solution;

[0038] S3. Weigh 1.5g of the detergent sample to be tested in a stoppered scale test tube, add 25mL of ultrapure water to completely dissolve the detergent sample to obtain a detergent sample solution, turn on the infrared radiation heater and heat up to 300°C, and the detergent Place the detergent s...

Embodiment 3

[0042] The assay method of EDTA content in dish soap comprises the following steps:

[0043] S1. Prepare EDTA standard stock solution, accurately weigh 0.1g of ethylenediaminetetraacetic acid standard product, accurate to 0.0001g, put it in a 100mL volumetric flask, add ultrapure water to the scale to constant volume to obtain EDTA with a mass concentration of 1000mg / L Standard stock solution;

[0044] S2. Prepare EDTA standard working solution, take 1mL, 0.5mL, 0.2mL, 0.1mL, 0.01mL EDTA standard stock solution in 100mL volumetric flask, dilute with ultrapure water to the scale constant volume, shake well, and ultrasonic for 10 minutes to obtain EDTA standard working solution;

[0045] S3. Weigh 0.5g of the detergent sample to be tested in a stoppered scale test tube, add 10mL of ultrapure water to completely dissolve the detergent sample to obtain a detergent sample solution, turn on the infrared radiation heater to heat up to 300°C, and dissolve the detergent Place the det...

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Abstract

The invention provides a method for determining the content of EDTA in a liquid detergent. The method comprises steps of S1, preparing EDTA standard stock solution; S2, preparing EDTA standard workingsolution; S3, carrying out esterification derivatization reaction of a to-be-detected liquid detergent sample to obtain to-be-detected sample solution; S4, simultaneously carrying out esterificationderivatization reaction of the EDTA standard working solution obtained in the step S2 according to the step S3 to obtain to-be-detected standard working solution; and S5, analyzing and detecting the to-be-detected standard working solution obtained in the step S4 and the to-be-detected sample solution obtained in the step S3 on a gas chromatograph-mass spectrometer to determine the content of EDTAin the detergent sample. The method is advantaged in that the EDTA content in the liquid detergent can be accurately quantified, the quantitative detection limit is low, and quantification accuracy and repeatability are good.

Description

technical field [0001] The invention relates to a method for measuring EDTA content in detergent. Background technique [0002] EDTA, generally refers to ethylenediaminetetraacetic acid or its sodium salt, is an important artificial organic polyacid chelating agent, which can be used as a stabilizer, dyeing aid, fiber treatment aid, coagulant, water treatment agent, soft water agent etc. It can form stable complexes with most metal ions to prevent deterioration and oxidation loss caused by metals, and can be widely used in pharmaceutical industry, chemical industry, food industry, agriculture and pharmaceutical industry, etc. Chelating agents are commonly used in detergents. Although they are added in a small amount, they play a very important role in improving the quality of products. At the same time, if not handled properly, chelating agents will also bring considerable negative damage to human health and the natural environment. [0003] Traditional chelating agents i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/047G01N2030/067
Inventor 李智
Owner WALCH GUANGZHOU COMMODITY