CN106841424A - The assay method of diaminotoluene in Composite laminated food packaging bag - Google Patents
The assay method of diaminotoluene in Composite laminated food packaging bag Download PDFInfo
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- CN106841424A CN106841424A CN201611259301.1A CN201611259301A CN106841424A CN 106841424 A CN106841424 A CN 106841424A CN 201611259301 A CN201611259301 A CN 201611259301A CN 106841424 A CN106841424 A CN 106841424A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N2030/022—Column chromatography characterised by the kind of separation mechanism
- G01N2030/025—Gas chromatography
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Abstract
The invention discloses a kind of assay method of diaminotoluene in Composite laminated food packaging bag, it selects toluene for extractant, optimizes sodium chloride addition, derivatization reaction temperature and time in TFAA addition, extraction process.The present invention has the advantages that：The defect problem in national standard method detection is solved, for the measure of diaminotoluene in Composite food packaging provides optimization method, the measure needs of diaminotoluene in Composite laminated food packaging bag is met.
Description
Technical field
The present invention relates to a kind of assay method, the measure of diaminotoluene in specifically a kind of Composite laminated food packaging bag
Method.
Background technology
Food all be unable to do without container package material in the storage transport process of circulation.China makes in composite soft packaging material
It is solvent-type double-component polyurethane adhesive with most adhesive, wherein often using containing toluene diisocynate in synthesis is processed
Ester (TDI) makees adhesive, and TDI is easily hydrolyzed into diaminotoluene (TDA), diaminotoluene (2,4- diaminotoluene) alias first
Benzene -2,4- diamines.Its pollution in Composite laminated food packaging bag is to be by the main component used during manufacture laminated film
What the polyurethanes bonding agent of toluene di-isocyanate(TDI) was hydrolyzed and produced, there is stimulation to mucous membrane, respiratory tract and skin, inhale
Enter, take in or can cause poisoning through skin absorption.Therefore diaminotoluene is important quality index in complex food material.State
It is inside and outside all to have made relevant regulations.The regulation description of aromatic amine in the regulation of European Union：Using the fragrance by diazo coupling
The material or commodity that the isocyanates of race is made for raw material should not discharge can detected level diaminotoluene.China《Complex food
Packaging bag sanitary standard》Middle regulation, the diaminotoluene content of packaging bag cannot be greater than 0.004mg/L.GB/T 5009.119-
2003《The measure of diaminotoluene in Composite laminated food packaging bag》, the standard sample pre-treatment is very cumbersome, using packed column gas
As chromatography, solvent uses dichloromethane, easily produces pollution to electron capture organ.
The content of the invention
The purpose of the present invention is directed to the deficiency of prior art described above presence, there is provided after a kind of optimization, can meet
The assay method of diaminotoluene in the Composite laminated food packaging bag that the measure of diaminotoluene needs in Composite laminated food packaging bag.
To achieve the object of the present invention, present invention employs following technical scheme：Diaminourea first in Composite laminated food packaging bag
The assay method of benzene, it is as follows the step of it includes：
(1) sample pre-treatments：Packaging bag distillation washing three times, drenches dry, by 1.5-2.5mL/cm2Calculate and load distillation
Water, hot-seal；By the packaging bag after above-mentioned hot-seal, it is placed in and is adjusted in 100 DEG C of baking ovens of 5 DEG C of scholar in advance, constant temperature 55-65min,
Take out nature to let cool to room temperature, cut off sealing, water is moved into standby in dry beaker；
(2) spare test piece 45.0-55.0ml is measured, is placed in separatory funnel, plus 8-15g sodium chloride, 8-15m1 toluene, extraction
3-8min is taken, 8-15min is stood, is back and forth extracted twice, take upper toluene layer, merge toluene liquid twice, toluene liquid is passed through into nothing
Aqueous sodium persulfate is filtered, to remove the moisture in extract；By in extract immigration revolving bottle, concentrated in 65-75 DEG C of water-bath
To 1.5-2.5ml, room temperature is let cool, add 15-25 μ l TFAAs, gently mixed, be placed in constant temperature in 28-32 DEG C of baking oven, entered
Row derivative reaction 38-42min, taking-up is let cool to room temperature, adds 1.6-2.4ml toluene, adds 4-6ml 20g/L carbonic acid
Hydrogen sodium solution, is shaken gently for 1.5-2.5min, stands 3-8min, takes out toluene of the upper strata containing 2,4- diaminotoluene derivatives
Layer, is settled to 5ml, for gas Chromatographic Determination with toluene；
(3) gas Chromatographic Determination：Gas Chromatographic Determination on the liquid that (2) step is obtained.
Preferably, in the Composite laminated food packaging bag diaminotoluene assay method, it is as follows the step of it includes：
(1) sample pre-treatments：Packaging bag distillation washing three times, drenches dry, by 2mL/cm2Calculate and load distilled water, heat-sealing
Mouthful；By the packaging bag after above-mentioned hot-seal, it is placed in and is adjusted in 100 DEG C of baking ovens of 5 DEG C of scholar in advance, constant temperature 60min takes out nature and puts
It is cooled to room temperature, cuts off sealing, water is moved into standby in dry beaker；
(2) spare test piece 50.0ml is measured, is placed in separatory funnel, plus 10g sodium chloride, 10m1 toluene, 5min is extracted, it is quiet
10min is put, is back and forth extracted twice, take upper toluene layer, merge toluene liquid twice, toluene liquid is filtered by anhydrous sodium sulfate,
To remove the moisture in extract；By in extract immigration revolving bottle, about 2ml is concentrated into 70 DEG C of water-baths, lets cool room temperature,
Add 20 μ l TFAAs, gently mix, be placed in constant temperature in 30 DEG C of baking ovens, perform the derivatization reaction 40min, taking-up let cool to
After room temperature, 2ml toluene is added, add 5ml 20g/L sodium bicarbonate solutions, be shaken gently for 2min, stand 5min, take out upper strata
Toluene layer containing 2,4- diaminotoluene derivatives, 5ml is settled to toluene, for gas Chromatographic Determination；
(3) gas Chromatographic Determination：Gas Chromatographic Determination on the liquid that (2) step is obtained.
The condition of the gas Chromatographic Determination is：Chromatographic column：TM-Pesticide 1, does not shunt, injector temperature 240
DEG C, 170 DEG C of column temperature, 280 DEG C of detector temperature, the μ l of sample size 1.
For the packaging bag for filling food:With distillation washing three times, drench dry, by 2mL/cm2Calculate and load distilled water, heat-sealing
Mouthful.
For the packaging bag for filling food：Clip, food is all removed, and is rinsed to without dirt with clear water, then use distilled water
Flush three times, drench to do and press 2mL/cm2, calculate and load distilled water, hot-seal.
Compared with prior art, the present invention has the advantages that：The defect problem in national standard method detection is solved,
For the measure of diaminotoluene in Composite food packaging provides optimization method, diaminourea in Composite laminated food packaging bag is met
The measure of toluene needs.
Brief description of the drawings
Fig. 1 toluene is the gas chromatogram of solvent；
Fig. 2 dichloromethane is the gas chromatogram of solvent；
Fig. 3 adds not influence curve figure of the same amount sodium chloride to diaminotoluene peak area；
Influence curve figure of Fig. 4 derivatization reactions temperature to diaminotoluene peak area；
Influence curve figure of Fig. 5 derivatization reaction times to diaminotoluene peak area.
Specific embodiment
In order to preferably illustrate present invention, illustrated with some preferably specific embodiments below.But these have
Body embodiment is simply to illustrate that present disclosure, limits rather than to present invention.
The assay method of diaminotoluene in Composite laminated food packaging bag, it is as follows the step of it includes：
(1) sample pre-treatments：Packaging bag distillation washing three times, drenches dry, by 1.8-2.3mL/cm2Calculate and load distillation
Water, hot-seal；By the packaging bag after above-mentioned hot-seal, it is placed in and is adjusted in 100 DEG C of baking ovens of 5 DEG C of scholar in advance, constant temperature 58-62min,
Take out nature to let cool to room temperature, cut off sealing, water is moved into standby in dry beaker；
(2) spare test piece 48.0-52.0ml is measured, is placed in separatory funnel, plus 8-15g sodium chloride, 8-13m1 toluene, extraction
4-6min is taken, 8-13min is stood, is back and forth extracted twice, take upper toluene layer, merge toluene liquid twice, toluene liquid is passed through into nothing
Aqueous sodium persulfate is filtered, to remove the moisture in extract；By in extract immigration revolving bottle, concentrated in 68-73 DEG C of water-bath
To 1.8-2.3ml, room temperature is let cool, add 18-23 μ l TFAAs, gently mixed, be placed in constant temperature in 28-32 DEG C of baking oven, entered
Row derivative reaction 38-42min, taking-up is let cool to room temperature, adds 1.8-2.3ml toluene, adds 4-6ml 20g/L carbonic acid
Hydrogen sodium solution, is shaken gently for 1.8-2.3min, stands 4-6min, takes out toluene of the upper strata containing 2,4- diaminotoluene derivatives
Layer, is settled to 5ml, for gas Chromatographic Determination with toluene；
(3) gas Chromatographic Determination：Gas Chromatographic Determination on the liquid that (2) step is obtained.
Most preferably, in the Composite laminated food packaging bag diaminotoluene assay method, it is as follows the step of it includes：
(1) sample pre-treatments：Filled the packaging bag of food:With distillation washing three times, drench dry, by 2mL/cm2Calculate and load
Distilled water, hot-seal；If filling the packaging bag of food：Clip, food is all removed, and is rinsed to without dirt with clear water,
Use distilled water flushing three times again, drench to do and presses 2mL/cm2, calculate and load distilled water, hot-seal；By the packaging after above-mentioned hot-seal
Bag, is placed in and is adjusted in 100 DEG C of scholars, 5 DEG C of baking ovens in advance, constant temperature 60min, takes out nature and lets cool to room temperature, cuts off sealing, and water is moved
Enter standby in dry beaker；
(2) spare test piece 50.0ml is measured, is placed in separatory funnel, plus 10g sodium chloride, 10m1 toluene, 5min is extracted, it is quiet
10min is put, is back and forth extracted twice, take upper toluene layer, merge toluene liquid twice, toluene liquid is filtered by anhydrous sodium sulfate,
To remove the moisture in extract；By in extract immigration revolving bottle, about 2ml is concentrated into 70 DEG C of water-baths, let cool to room
Temperature, adds 20 μ l TFAAs, gently mixes, and is placed in constant temperature in 30 DEG C of baking ovens, performs the derivatization reaction 40min, and taking-up is put
After being cooled to room temperature, 2ml toluene is added, add 5ml 20g/L sodium bicarbonate solutions, be shaken gently for 2min, stand 5min, taken out
Toluene layer of the upper strata containing 2,4- diaminotoluene derivatives, is settled to 5ml, for gas Chromatographic Determination with toluene；
(3) gas Chromatographic Determination：Gas Chromatographic Determination on the liquid that (2) step is obtained；The gas Chromatographic Determination
Condition is：Chromatographic column：TM-Pesticide 1, does not shunt, 240 DEG C of injector temperature, 170 DEG C of column temperature temperature, detector temperature
280 DEG C, the μ l of sample size 1.
Confirmatory experiment
1.1 main agents and instrument
Toluene：Analysis is pure
Sodium chloride：Analyze pure, 650 DEG C of calcination 4h
Sodium acid carbonate：Analysis is pure
Anhydrous sodium sulfate：Analysis is pure
TFAA：Purity 98%
Sodium bicarbonate solution (20g/L)：2g sodium acid carbonates are weighed to be dissolved in about 100mL water
Diaminotoluene standard items：(purity 98%)
2,4- diaminotoluene standard stock solutions：Accurate 2,4- diaminotoluenes 10mg (104-0.01mg) that weigh move people
In 100ml volumetric flasks, plus toluene is to scale, every milliliter of μ g containing 2,4- diaminotoluenes 100 of this solution, to store in and preserve standby in refrigerator
With
2,4- diaminotoluene standard solutions：1ml 2 is taken, 4- diaminotoluene standard stock solutions are in 100ml capacity
In bottle, plus toluene is to scale, is made 1 μ g/ml 2,4- diaminotoluene standard solutions, stores in and save backup in refrigerator
Gas chromatograph, is equipped with electron capture detector (ECD)
The chromatographic columns of TM-Pesticide 1
EL204 type electronic balances
Electric heating air blast thermostatic drying chamber
RE-52 Rotary Evaporators
Separatory funnel
1.2 test methods
1.2.1 chromatographic condition
Chromatographic column：TM-Pesticide 1, does not shunt, 240 DEG C of injector temperature, 170 DEG C of column temperature temperature, detector temperature
280 DEG C, the μ l of sample size 1.
1.2.2 sample pre-treatments
Filled the packaging bag of food:With distillation washing three times, drench dry, by 2mL/cm2, calculate and load distilled water, hot-seal.
Filled the packaging bag of food：Clip, food is all removed, and is rinsed to without dirt with clear water, then rushed with distilled water
Wash three times, drench to do and press 2mL/cm2, calculate and load distilled water, hot-seal.
By the packaging bag after above-mentioned hot-seal, it is placed in and is adjusted in 100 DEG C of scholars, 5 DEG C of baking ovens in advance, constant temperature 60min takes out certainly
So let cool to room temperature, cut off sealing, water is moved into standby in dry beaker.
1.2.3 the drafting of standard items curve
2,4- diaminotoluene derivatization treatments：A certain amount of 2,4- diaminotoluenes Standard Reserving Solution is taken respectively, uses first
Benzene accurate dilutions respectively take into 2, the 4- diaminotoluene standard working solutions of 0.01,0.03,0.05,0.08,0.10,0.12 μ g/ml
Working solution 5.00ml is placed in 100m1 separatory funnels, adds 20 μ l TFAAs, is shaken gently for, and 30 DEG C of perseverances are placed on after close plug
Reaction 40min is performed the derivatization in incubator, after taking-up is cooled to room temperature, 5ml20g/L sodium bicarbonate solutions is added, is shaken gently for
2min, stratification takes out toluene layer of the upper strata containing 2,4- diaminotoluene derivatives, and this is 2,4- diaminotoluenes-three
Fluoroacetic acid acid anhydride standard working solution.Above-mentioned 6 2,4 di amino toluenes-TFAA standard working solution is extracted into 1 μ l notes respectively
To enter be analyzed in gas chromatograph.
1.2.4 sample determination
Spare test piece 50.0ml is measured, is placed in separatory funnel, plus 10g sodium chloride, 10m1 toluene, 5min is extracted, stand
10min, is back and forth extracted twice, and takes upper toluene layer, merges toluene liquid twice, and toluene liquid is filtered by anhydrous sodium sulfate, with
Just the moisture in extract is removed；By in extract immigration revolving bottle, about 2ml is concentrated into 70 DEG C of water-baths, let cool, add 20
μ l TFAAs, are gently mixed, and are placed in constant temperature in 30 DEG C of baking ovens, perform the derivatization reaction 40min, and taking-up is let cool to room temperature
Afterwards, 2ml toluene is added, 5ml 20g/L sodium bicarbonate solutions are added, 2min is shaken gently for, 5min is stood, upper strata is taken out and is contained 2,
The toluene layer of 4- diaminotoluene derivatives, is settled to 5ml, for gas Chromatographic Determination with toluene.
2 results and discussion
The selection of 2.1 extractants
Electron capture detector (ECD) is that it is only to those with the highly sensitive gas chromatography detector of high selectivity
The compound of electronics can be captured, such as halogenated hydrocarbons, the heteroatomic compound containing N, O and S has response.Therefore ECD to impurity very
Sensitivity, therefore each link is intended to consider whether to bring polluter into.And it is multiple specified in GB/T5009.119-2003
Diaminotoluene in packaging for foodstuff is extracted with boiling water in diaminotoluene assay method in combined foodstuff packaging bag.Dichloromethane is
Halogen-containing compound, it has electronegativity very high, makees extractant with it and solvent can severe contamination detector.Marked in country
It is dichloromethane that solvent is used in standard, has response very high through electron capture detector, produces big tailing peak, causes diamino
Base toluene can not be realized efficiently separating, and influence the accuracy for determining, as shown in Figure 2.Therefore, selection does not have electronegativity and energy
Enough dissolve the benzene or toluene of diaminotoluene to replace dichloromethane, the separation of solution diaminotoluene and dichlorotoleune are to inspection
The pollution problem of device is surveyed, as shown in figure 1, diaminotoluene is separated preferably with solvent, baseline separation can be accomplished.Yet with benzene
Toxicity is larger, has larger harm for experimenter and environment, therefore this experiment selects toluene as extractant.
The amount of sodium chloride is added in 2.2 extraction processes
Compare addition not influence of the same amount sodium chloride to measurement result in extraction process, test result indicate that, extraction effect
Rate is improved with the increase for adding sodium chloride quality, when 10g sodium chloride is added in extract, its peak area held stationary.
Reason is to produce salting-out effect after adding sodium chloride, reduces solubility of the diaminotoluene in water, and increased it is having
The solubility of machine phase.Measurement result is illustrated in fig. 3 shown below.It can be seen that under conditions of 5g sodium chloride is added, with treating
The increase of sodium chloride quality is added in survey product, peak area gradually increases, but when the quality for adding sodium chloride reaches 10g, peak
Area no longer increases with the increase of addition.Therefore it is 10g that this experiment adds the quality of sodium chloride.
The selection of 2.3 derivatization reaction temperature
The diaminotoluene standard liquid that concentration is 0.10 μ g/ml is taken, respectively at 25 DEG C, 30 DEG C, 35 DEG C, 40 DEG C and 45 DEG C
Temperature derived, measurement result is illustrated in fig. 4 shown below.Experiment shows that derivatization reaction most fills when derivatization reaction temperature is 30 DEG C
Point, therefore the derivative temperature of this experiment selects 30 DEG C.
The selection of 2.4 derivatization reaction times
Take the diaminotoluene standard liquid that concentration is 0.10 μ g/ml investigate respectively the derivatization reaction time be respectively 10,20,
30th, 40,50 and 60min, determines in accordance with the law.Result is as shown in Figure 5.Result shows, derivatization reaction when the derivatization reaction time is 40min
Most fully, therefore the derivative time of this research select 40min.
2.5 Precision Experiments
From the diaminotoluene standard liquid that concentration is 0.08 μ g/ml METHOD FOR CONTINUOUS DETERMINATION 10 is carried out according to this experimental technique
It is secondary, calculated with the result of last 7 METHOD FOR CONTINUOUS DETERMINATIONs, it is 1.08% to obtain relative standard deviation；See the table below 2：
The precision measurement result of table 2
Form an alliance and show, this experiment relative standard deviation is 1.08%, with good repeatability.
2.6 rate of recovery are tested
The food package box for having determined diaminotoluene content is taken, different amounts of diaminotoluene standard is separately added into molten
Liquid, by this measuring, calculates recovery of standard addition, as a result see the table below 3.
The sample recovery of standard addition experimental result of table 3
Result shows that between 89.30%-96.40%, the present invention has preferably recovery to measuring recovery of standard addition
Rate.
It can be seen that, optimal operating condition of the present invention is：It is extractant from toluene, adds sodium chloride 10g, derivatization reaction temperature
It is 30 DEG C to spend, and the derivatization reaction time is 40min.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from Spirit Essence of the invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent replacement mode is should be, is included within protection scope of the present invention.
Claims (5)
1. in Composite laminated food packaging bag diaminotoluene assay method, it is characterised in that including the step of it is as follows：
(1) sample pre-treatments：Packaging bag distillation washing three times, drenches dry, by 1.5-2.5mL/cm2Calculate and load distilled water, heat-sealing
Mouthful；By the packaging bag after above-mentioned hot-seal, it is placed in and is adjusted in 100 DEG C of baking ovens of 5 DEG C of scholar in advance, constant temperature 55-65min takes out certainly
So let cool to room temperature, cut off sealing, water is moved into standby in dry beaker；
(2) spare test piece 45.0-55.0ml is measured, is placed in separatory funnel, plus 8-15g sodium chloride, 8-15m1 toluene, extract 3-
8min, stands 8-15min, is back and forth extracted twice, and takes upper toluene layer, merges toluene liquid twice, and toluene liquid is passed through into anhydrous sulphur
Sour sodium filtering, to remove the moisture in extract；By in extract immigration revolving bottle, it is concentrated into 65-75 DEG C of water-bath
1.5-2.5ml, lets cool room temperature, adds 15-25 μ l TFAAs, gently mixes, and is placed in constant temperature in 28-32 DEG C of baking oven, carries out
Derivative reaction 38-42min, taking-up is let cool to room temperature, adds 1.6-2.4ml toluene, adds 4-6ml 20g/L bicarbonates
Sodium solution, is shaken gently for 1.5-2.5min, stands 3-8min, takes out toluene layer of the upper strata containing 2,4- diaminotoluene derivatives,
5ml is settled to toluene, for gas Chromatographic Determination；
(3) gas Chromatographic Determination：Gas Chromatographic Determination on the liquid that (2) step is obtained.
2. in Composite laminated food packaging bag according to claim 1 diaminotoluene assay method, it is characterised in that including
The step of it is as follows：
(1) sample pre-treatments：Packaging bag distillation washing three times, drenches dry, by 2mL/cm2Calculate and load distilled water, hot-seal；Will
Packaging bag after above-mentioned hot-seal, is placed in and is adjusted in 100 DEG C of scholars, 5 DEG C of baking ovens in advance, constant temperature 60min, takes out nature and lets cool to room
Temperature, cuts off sealing, water is moved into standby in dry beaker；
(2) spare test piece 50.0ml is measured, is placed in separatory funnel, plus 10g sodium chloride, 10m1 toluene, 5min is extracted, stand
10min, is back and forth extracted twice, and takes upper toluene layer, merges toluene liquid twice, and toluene liquid is filtered by anhydrous sodium sulfate；Will
Extract is moved into revolving bottle, and 2ml is concentrated into 70 DEG C of water-baths, is let cool to room temperature, adds 20 μ l TFAAs, is mixed,
Constant temperature in 30 DEG C of baking ovens is placed in, reaction 40min is performed the derivatization, taking-up is let cool to room temperature, adds 2ml toluene, adds 5ml
20g/L sodium bicarbonate solutions, shake 2min, stand 5min, take out toluene layer of the upper strata containing 2,4- diaminotoluene derivatives, use
Toluene is settled to 5ml, for gas Chromatographic Determination；
(3) gas Chromatographic Determination：Gas Chromatographic Determination on the liquid that (2) step is obtained.
3. in Composite laminated food packaging bag according to claim 1 diaminotoluene assay method, it is characterised in that it is described
The condition of gas Chromatographic Determination is, chromatographic column：TM-Pesticide 1, does not shunt, 240 DEG C of injector temperature, 170 DEG C of column temperature,
280 DEG C of detector temperature, the μ l of sample size 1.
4. in Composite laminated food packaging bag according to claim 1 diaminotoluene assay method, it is characterised in that for
The packaging bag distillation washing three times of food was filled, drenched dry, and calculated by 2mL/cm2 and load distilled water, hot-seal.
5. in Composite laminated food packaging bag according to claim 1 diaminotoluene assay method, it is characterised in that for
The packaging bag of food is filled, food is all removed, rinsed to without dirt with clear water by first clip, then with distilled water flushing three times, drenched
It is dry to press 2mL/cm2, calculate and load distilled water, hot-seal.
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Citations (2)
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| CN104062378A (en) * | 2014-07-10 | 2014-09-24 | 四川北方红光特种化工有限公司 | Detection method of diaminotoluene (TDA) isomer |
| CN104672370A (en) * | 2015-03-18 | 2015-06-03 | 深圳市北测检测技术有限公司 | 2,4-diaminotoluene molecularly imprinted polymer, preparation method and application thereof |
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2016
- 2016-12-30 CN CN201611259301.1A patent/CN106841424A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062378A (en) * | 2014-07-10 | 2014-09-24 | 四川北方红光特种化工有限公司 | Detection method of diaminotoluene (TDA) isomer |
| CN104672370A (en) * | 2015-03-18 | 2015-06-03 | 深圳市北测检测技术有限公司 | 2,4-diaminotoluene molecularly imprinted polymer, preparation method and application thereof |
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| Title |
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| 李少霞 等: "复合食品包装袋中二氨基甲苯的气相色谱及气质联用法测定", 《食品科学》 * |
| 胡建 等: "气相色谱－电子捕获检测法测定食品包装材料中2,4-二氨基甲苯", 《分析科学学报》 * |
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