Method for testing alkyl quaternaries cationic surfactant

A surfactant and alkyl quaternary ammonium technology, which is applied in the detection field of alkyl quaternary ammonium cationic surfactants, can solve the problems of expensive detection instruments and poor qualitative results, and achieve cheap instruments and accurate analysis methods , the effect of little interference

Inactive Publication Date: 2008-09-03
CENT TESTING INT GRP CO LTD
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  • Claims
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Problems solved by technology

In addition, by adding organic reagents such as dibromocarboxyphenyldiazoaminoazobenzene, an association color reaction occurs with alkyl quaternary ammonium salt surfactants in alkaline medium, and then analysis by spectrophotometry is also a kind of Methods for the detection of cationic surfactants based on alkyl quaternary ammonium salts; however, these methods have the disadvantage of poor qualitative results when interfering substances are present
Studies have shown that the use of atmospheric pressure

Method used

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  • Method for testing alkyl quaternaries cationic surfactant
  • Method for testing alkyl quaternaries cationic surfactant
  • Method for testing alkyl quaternaries cationic surfactant

Examples

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Example Embodiment

[0027]Example 1

[0028] Using isopropanol as the solvent, prepare a series of standard solutions of dioctadecyl dimethyl ammonium chloride, and perform gas chromatography-mass spectrometry GC-MS analysis and detection according to the above experimental conditions. The sample port temperature is set to 300°C; the interface temperature is set to 250°C; the carrier gas is helium with a flow rate of 1 ml / min; the column temperature control adopts a programmed temperature rise mode, starting from 40°C and 10°C / min. The rate is increased to 210°C for 2 minutes, and then at a rate of 20°C / min to 320°C for 2 minutes; the ion source for mass spectrometry detection adopts an electron bombardment source (EI source), and the bombardment energy of the ion source is 70eV. The source temperature is 250°C; the injection volume is 1 microliter. Figure 1a Is the chromatogram of the detected decomposition products of dioctadecyldimethylammonium chloride, the ordinate in the chromatogram represent...

Example Embodiment

[0029] Example 2

[0030] Accurately weigh 0.5 g of the conditioner sample into an Erlenmeyer flask, add an appropriate amount of isopropanol to the round-bottom flask, place it in an ultrasonic field, and perform ultrasonic extraction at room temperature for 2 hours. Extract three times in this way, combine the extracts into a round bottom flask, concentrate the extracts by rotary evaporation, dilute to 50 ml volumetric flask with isopropanol, take 10 ml, dry with anhydrous sodium sulfate, filter, and take the mother liquor for gas chromatography -Mass spectrometry combined testing. Three parallel samples were made for this sample, the test numbers are A, B, and C respectively. The analysis results are shown in Table 1, and the first parallel sample (test number A) was repeated five times. The analysis results are shown in Table 2. From Table 1, the relative standard deviation (RSD) of the parallel samples was 3.29%. From Table 2, the relative standard deviation of repeated tests...

Example Embodiment

[0035] Example 3

[0036] The standard solution in Example 1 was added to the conditioner sample in Example 2, and the experiment was carried out in accordance with the above-mentioned sample pretreatment method and instrument analysis and detection method. Four spiked contents were made for this sample, and the average value was taken for 3 parallel measurements for each spiked content sample. According to the actual added amount and the measured results, the spiked recovery rate of the sample was calculated. The experimental results are shown in Table 3. It can be seen from Table 3 that the sample recovery rate is between 95% and 105%.

[0037] Table 3 The recovery rate of this sample

[0038]

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Abstract

The invention provides a method for testing the alkyl quaternary ammonium salt cationic, which includes the following steps: processing a pretreatment for the test sample; testing with a gas-chromatography-mass spectrometer, setting the injection port temperature of the instrument at 180-350 EDG C, setting the carrier gas flow rate at 0.5-2.0 ml per minute, the chromatographic column is a nonpolar, weak polar or strong polar column, setting the port temperature at 180-300 EDG C; injecting the pretreatmented sample into the chromatographic column through the injection port of the instrument, processing the programmed temperature, from 40-120 EDG C up to 210-320 EDG C, processing the mass spectrometric detection after each component of the decomposition products of the sample is separated by the chromatographic column. The method provided by the invention has the merits of cheap test instrument, safety, accurate and fast analysis method and small disturbance, which causes the alkyl quaternary ammonium salt cationic in the sample to pyrolyze on the injection port, and processes the optimized separation of each component of the pyrolyzed products.

Description

【Technical field】 [0001] The invention relates to a detection method for alkyl quaternary ammonium salt cationic surfactants, in particular to a method for detecting alkyl quaternary ammonium salt cationic surfactants by means of gas chromatography-mass spectrometry technology. 【Background technique】 [0002] Cationic surfactants have been widely used as fungicides, fabric softeners, antistatic agents, hair conditioners, etc., and are one of the important chemical raw materials in the washing industry and cosmetics industry. Alkyl quaternary ammonium salts with hydrophobic groups directly attached to nitrogen atoms are the simplest and most widely used cationic surfactants. Because alkyl quaternary ammonium salt cationic surfactants can provide excellent static control ability, wet combing and dry combing properties, deep conditioning effect and good additive properties, they are often used in hair conditioner formulations; in addition, alkyl quaternary ammonium salts Catio...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/72G01N30/54G01N30/06
Inventor 杨果王鑫何树悠刘蔷薇梁圆圆郭冰
Owner CENT TESTING INT GRP CO LTD
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