CN109030654B - Method for rapidly detecting low-molecular chlorinated organic matters in papermaking white water and application - Google Patents
Method for rapidly detecting low-molecular chlorinated organic matters in papermaking white water and application Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 42
- CFXQEHVMCRXUSD-UHFFFAOYSA-N 1,2,3-Trichloropropane Chemical compound ClCC(Cl)CCl CFXQEHVMCRXUSD-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000605 extraction Methods 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 28
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- 229940051269 1,3-dichloro-2-propanol Drugs 0.000 claims abstract description 17
- DEWLEGDTCGBNGU-UHFFFAOYSA-N 1,3-dichloropropan-2-ol Chemical compound ClCC(O)CCl DEWLEGDTCGBNGU-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003795 desorption Methods 0.000 claims abstract description 15
- 238000001819 mass spectrum Methods 0.000 claims abstract description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 4
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 239000007790 solid phase Substances 0.000 claims abstract description 4
- 238000001319 headspace solid-phase micro-extraction Methods 0.000 claims abstract description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 20
- 229920000058 polyacrylate Polymers 0.000 claims description 10
- 239000011780 sodium chloride Substances 0.000 claims description 10
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- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims description 4
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a method for rapidly detecting low-molecular chlorinated organic matters in papermaking white water and application thereof. The method comprises the following steps: (1) pretreating a sample to be detected: filtering papermaking white water of a water sample to be detected, and adding chloride to obtain a sample to be detected; (2) preparing a standard solution: adding 1, 3-dichloro-2-propanol and 1,2, 3-trichloropropane into papermaking white water to prepare standard solutions with at least 5 concentrations; (3) solid phase microextraction-gas chromatography-mass spectrometry detection: respectively extracting the sample to be detected and the standard solution in the step by adopting a headspace solid-phase microextraction mode, inserting an extraction head into a sample inlet of a gas chromatography-mass spectrum for desorption, and performing gas chromatography-mass spectrum measurement to calculate the content of the 1, 3-dichloro-2-propanol and the 1,2, 3-trichloropropane in the sample. The method has the advantages of simple operation, high efficiency, sensitivity, high recovery rate and low cost, and is suitable for analyzing the volatile chlorinated organic compounds in the papermaking white water.
Description
Technical Field
The invention belongs to the field of detection of toxic substances in papermaking chemicals, and particularly relates to a method for rapidly detecting low-molecular chlorinated organic matters in papermaking white water and application thereof.
Background
The polyamide epichlorohydrin resin (PAE resin for short) as the humidifying intensifier has the advantages of good humidifying effect, no formaldehyde, small dosage, suitability for medium-alkaline papermaking and the like, and is widely applied to the papermaking industry. With the improvement of living standard of people, the demand of high wet strength paper is more and more strong, so the PAE resin is widely used in the paper making process. However, in the prior art, the PAE production process generates some byproducts, and the byproducts are generated by hydrolyzing epichlorohydrin to generate micromolecular chlorinated organic substances. These chlorinated organics can contaminate the paper sheet and white water system when PAE is used in the papermaking process.
The low molecular chlorinated organic compound has good lipid solubility, is slowly metabolized in organisms, and can be concentrated and accumulated in the organisms to cause long-term chronic toxic effect. Particularly, the traditional Chinese medicine composition has strong toxicity to the liver, and some of the traditional Chinese medicine composition even has carcinogenicity. The low molecular chlorinated organic compounds can be accumulated in the white water after the white water for papermaking is recycled for many times, and the recycled white water is used for producing paper and can be transferred into the paper. The paper is used in the aspects of daily life and is in zero-distance contact with the skin of a human body, and chlorinated organic matters in the paper can cause damage to the human body. After the white water recycled for many times is discharged and treated, the low molecular chlorinated organic compounds contained in the white water can also cause harm to water organisms.
The content of low molecular chloro-organic matter is determined by titration method in traditional method. I.e. by silver nitrate precipitation titration, which firstly requires extraction with an organic solvent such as ethyl acetate and secondly ionization of the chlorine-containing species with potassium permanganate solution to oxidize it from organic chlorine to inorganic chloride ions, prior to titration. The traditional titration method has high detection limit, and trace chlorinated organic compounds cannot be accurately measured by the method.
In addition to the above-mentioned chemical titration methods, there are also some instrumental analysis methods. Because the content of low-molecular chlorinated organic matters in the papermaking white water is generally low, the interference of white water matrixes is large, the traditional methods such as liquid-liquid extraction, solid-phase extraction and the like need to enrich and concentrate the white water (500-1000 ml) with large volume to ensure that the detection limit is reached, the pretreatment process has the defects of large solvent consumption (100-300 ml of organic reagent is needed for liquid-liquid extraction), complex operation and time consumption (each sample is extracted, enriched, concentrated and the like, the time consumption is about 8 hours), and the like, so that the development of related detection and research work is greatly restricted.
Therefore, the method for efficiently and quickly detecting the chlorinated organic compounds in the papermaking white water is established, and has great significance for environmental protection and paper quality safety.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for quickly detecting low-molecular chlorinated organic matters in papermaking white water.
The invention also aims to provide the application of the method for rapidly detecting the low-molecular chlorinated organic matters in the papermaking white water.
The purpose of the invention is realized by the following technical scheme: a method for rapidly detecting low-molecular chlorinated organic matters in papermaking white water comprises the following steps:
(1) pretreatment of sample to be tested
Filtering the papermaking white water of a water sample to be detected to obtain a filtered papermaking white water sample; then, putting the paper making white water sample into a headspace bottle, adding chloride, and balancing for 10-60 min at 35-70 ℃ to obtain a sample to be detected;
(2) preparing standard solution
Adding 1, 3-dichloro-2-propanol (DCP) and 1,2, 3-trichloropropane into papermaking white water, and preparing a mixed solution of 1, 3-dichloro-2-propanol and 1,2, 3-trichloropropane with at least 5 concentrations as a standard solution;
(3) solid phase microextraction-gas chromatography-mass spectrometry detection (SPME-GC/MS)
Respectively extracting the sample to be detected obtained in the step (1) and the standard solution obtained in the step (2) for 10-60 min at 35-70 ℃ by adopting a headspace solid phase microextraction mode; then inserting an extraction head of the standard solution obtained after extraction into a sample inlet of a gas chromatography-mass spectrometer (GC/MS) for desorption, carrying out gas chromatography-mass spectrometer detection, and carrying out regression analysis according to the chromatographic peak area of the standard solution corresponding to the concentration of the standard solution to obtain a standard working curve; and then inserting an extraction head of a sample to be detected obtained after extraction into a sample inlet of a gas chromatography-mass spectrometry (GC/MS) under the same condition for desorption, performing gas chromatography-mass spectrometry determination, comparing the result with a standard working curve, and calculating the content of the 1, 3-dichloro-2-propanol and the 1,2, 3-trichloropropane in the sample.
The chloride salt described in step (1) is preferably NaCl.
The mass ratio of the NaCl to the papermaking white water sample is 0.3-2.1: 1-10; preferably 0.3-2.1: 5; more preferably 2.1: 5.
the headspace bottle in step (1) is preferably a 20ml headspace bottle.
The conditions of the equilibrium described in step (1) are preferably: equilibrating at 40 ℃ for 60 min.
And (3) the papermaking white water in the step (2) is the papermaking white water generated by the non-wet strength agent during papermaking of paper.
The mass ratio of long fibers to short fibers is 2:3, the beating degree of the long fibers is 20 DEG SR, the beating degree of the short fibers is 22 DEG SR, and the sizing concentration is 0.9 wt% during paper making.
The concentration ranges of the 1, 3-dichloro-2-propanol (DCP) and the 1,2, 3-trichloropropane in the standard solution in the step (2) are both 0.1-10 mu g/L.
The concentrations of 1, 3-dichloro-2-propanol (DCP) and 1,2, 3-trichloropropane in the standard solution described in step (2) were paired as follows: 0.1. mu.g/L/0.1. mu.g/L, 0.5. mu.g/L/0.5. mu.g, 1. mu.g/L/1. mu.g/L, 2. mu.g/L/2. mu.g, 3. mu.g/L/3. mu.g, 4. mu.g/L/4. mu.g, 5. mu.g/L/5. mu.g/L, 10. mu.g/L/10. mu.g/L.
The extraction head of the solid phase micro-extraction in the step (3) is an 85 μm Carboxen/PDMS extraction head, an 85 μm Polyacrylate (Polyacrylate) extraction head or a 65 μm PDMS/DVB extraction head; preferably an 85 μm Polyacrylate (Polyacrylate) extraction head; more preferably an aged 85 μm Polyacrylate (Polyacrylate) extraction head.
The aging conditions are as follows: aging in a GC injection port at 250 deg.C for 15 min.
The solid phase micro-extraction conditions in the step (3) are as follows: extracting for 40min at 35-70 ℃; preferably: extracting at 40 deg.C for 40 min; more preferably: extracting at 800r/min and 40 deg.C for 40 min.
The desorption conditions in the step (3) are as follows: desorbing for 2-10 min at 240-280 ℃; preferably: desorbing at 240 deg.C for 6 min.
And (3) the chromatographic column used for the gas chromatography-mass spectrometry in the step (3) is a DB-WAX chromatographic column, the length of the chromatographic column is 30m, and the inner diameter of the chromatographic column is 0.25 mm.
The gas chromatography-mass spectrometry conditions in the step (3) are as follows:
the temperature rising procedure is as follows: keeping the temperature at 35 ℃ for 1min, heating to 180 ℃ at 10 ℃/min for 3min, and heating to 240 ℃ at 15 ℃/min for 1 min;
sample inlet temperature: at 240 ℃.
The conditions of the gas chromatography-mass spectrometry in the step (3) are as follows: EI (El)+An ion source; single quadrupole mass spectrometry detection; the energy is 70 eV; full scan ion monitoring (full scan).
The method for rapidly detecting the low-molecular chlorinated organic matters in the paper making white water is applied to detecting the low-molecular chlorinated organic matters in the paper making white water.
The low molecular weight chlorinated organic compounds are 1, 3-dichloro-2-propanol (DCP) and 1,2, 3-trichloropropane.
Compared with the prior art, the invention has the following advantages and effects:
1. compared with the traditional method, the pretreatment analysis and detection method for the low-molecular chlorinated organic matters in the papermaking white water has the characteristics of rapidness, high efficiency and environmental protection, the traditional method needs long pretreatment time and is complex to operate, a large amount of organic reagents are consumed, and the substances to be detected are easy to lose or pollute.
2. The invention utilizes the solid phase microextraction technology to separate and enrich the low molecular chlorinated organic compounds in the paper making white water, and the gas chromatography-mass spectrometry technology is used for detecting and analyzing the sample, thereby realizing the rapid detection of the low molecular chlorinated organic compounds in the paper making white water. The solid phase micro-extraction technology has the advantages of rapidness, high efficiency, simplicity and convenience and the like, and particularly has wide application prospect in the detection of trace pollutants.
3. The method optimizes parameter conditions through a chemometrics strategy, realizes the integration of pretreatment and sample introduction from sampling for analysis and detection in the papermaking white water, and has the advantages of quick analysis, small required sample amount, no use of organic solvent in the detection process, simple operation, low detection limit and high reproducibility.
4. The method integrates extraction, enrichment and separation and a sample introduction technology, has the advantages of quick analysis, high efficiency, sensitivity, environmental protection, high recovery rate and low cost, is suitable for the separation and enrichment technology for processing trace samples, and is suitable for analyzing volatile chlorinated organic compounds in the papermaking white water.
Drawings
Fig. 1 is a chromatogram of low molecular chlorinated organics in papermaking white water.
FIG. 2 is a graph showing a standard curve of 1, 3-dichloro-2-propanol (DCP).
FIG. 3 is a standard graph of 1,2, 3-trichloropropane.
FIG. 4 is a graph showing the effect of extraction time on the sensitivity of DCP and 1,2, 3-trichloropropane detection.
FIG. 5 is a graph showing the effect of the amount of NaCl added on the sensitivity of detection of DCP and 1,2, 3-trichloropropane.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto. The experimental procedures used in the examples below are, unless otherwise specified, conventional procedures known in the art, and the ingredients or materials used, if not specified, are commercially available ingredients or materials.
Example 1
A method for rapidly determining low-molecular chlorinated organic matters in papermaking white water comprises the following steps:
(1) pretreatment of sample to be tested
Filtering the papermaking white water of a water sample to be detected by using medium-speed qualitative filter paper to remove suspended matters, and then accurately weighing 5 g of the papermaking white water and 2.1 g of NaCl in a 20ml headspace bottle to balance for 1h at 40 ℃.
(2) Solid Phase Microextraction (SPME)
Carrying out aging treatment on the solid-phase micro-extraction fiber head: aging 85 μm Polyacrylate (Polyacrylate) extraction head in a GC (gas chromatography) inlet for 15min at 250 deg.C to remove surface residue; then inserting the sample balanced in the step (1) into a headspace bottle by using an aged solid phase microextraction fiber head (polyacrylate extraction head), pushing out the solid phase microextraction fiber head headspace extraction sample, wherein the extraction temperature is 40 ℃, and the extraction time is 40min (the stirring extraction of a magnetic stirrer is carried out, and the rotating speed is 800 r/min); inserting the solid-phase microextraction sample injection needle after sample adsorption into a solid-phase microextraction-gas chromatography-mass spectrometry (GC/MS) interface, pushing out a solid-phase microextraction fiber head, and fastening a fixing buckle; and starting GC/MS to desorb the solid phase micro-extraction head, desorbing the enriched compound at high temperature, introducing the enriched compound into a chromatogram along with a mobile phase for desorption and detection, wherein the desorption temperature is 240 ℃ and the desorption time is 6 min. And after desorption, opening the fixing buckle, pulling back the push rod of the solid phase microextraction handle to retract the solid phase microextraction fiber head into the puncture isolation needle, and taking down the solid phase microextraction handle to perform next extraction operation. The chromatogram of the papermaking white water is shown in fig. 1.
(3) Gas chromatography-mass spectrometry (GC/MS)
An Agilent 7890A-5977B gas chromatography-mass spectrometer is adopted:
① chromatographic conditions:
the temperature rising procedure is as follows: keeping the temperature at 35 ℃ for 1min, heating to 180 ℃ at 10 ℃/min for 3min, and heating to 240 ℃ at 15 ℃/min for 1 min;
a chromatographic column: DB-WAX (Agilent Corp.), 30m long and 0.25mm inner diameter; the injection port temperature was 240 ℃.
② Mass Spectrometry conditions:
EI with pull-out lens+An ion source; single quadrupole mass spectrometry detection; energy: 70 eV; mass spectrum scanning mode: full scan ion monitoring (full scan).
(4) Drawing a standard curve and measuring the content of the low-molecular chlorinated organic matter
① drawing standard curve, accurately measuring 1, 3-dichloro-2-propanol (DCP) and 1,2, 3-trichloropropane standard, adding into self-made unhumidified strong agent papermaking white water (white water is white water generated during papermaking of paper, the mass ratio of long fibers to short fibers in papermaking process is 2:3, the fibers are all from commercial pulp board purchased from certain living paper mill, the beating degree of the long fibers is 20 DEG SR, the beating degree of the short fibers is 22 DEG SR, the sizing concentration is 0.9 wt%), configuring mixed solution of 1, 3-dichloro-2-propanol (DCP) and 1,2, 3-trichloropropane, the concentration is 0.1 mug/L/0.1 mug/L, 0.5 mug/L/0.5 mug, 1 mug/L/1 mug/L, 2 mug/L/2 mug, 3 mug/L/3 mug/L, 4 mug/L/5 mug/L, 5 mug/1 mug/L, the desorption concentration of the sample is obtained by performing gas chromatography-phase chromatography, the corresponding to the gas chromatography concentration is obtained by performing gas chromatography-phase gradient extraction, the corresponding to the standard curve is obtained by the gas chromatography, the corresponding to the gas chromatography concentration is obtained by the gas chromatography gradient extraction, the corresponding to the gas chromatography concentration is 240-gas chromatography concentration is obtained, and the gas chromatography is obtained by the corresponding to the gas chromatography is obtained by the gas chromatography, the gas chromatography is obtained by the corresponding to the gas chromatography, the gas chromatography is obtained, the gas chromatography is obtained, the gas chromatography is taken, the gas chromatography is.
②, determining the content of the low-molecular chlorinated organic compounds in the sample, namely performing solid phase microextraction on the sample to be detected obtained in the step (3) according to the method in the step (2), then inserting an extraction head of the sample to be detected obtained after extraction into a GC/MS sample inlet for desorption (desorption temperature is 240 ℃, desorption time is 6min), performing gas chromatography-mass spectrometry, determining the retention time qualitatively, determining the peak area of the target, and substituting the peak area into a standard curve equation to obtain the content of the low-molecular chlorinated organic compounds in the sample.
(5) Recovery and precision
Under the measuring conditions of the method, the linear correlation, the detection limit (3 times of signal to noise ratio, reaching ng level), the standard adding recovery rate (the standard adding recovery rate is obtained by measuring by a standard adding method, namely, a known amount of the object to be measured is added into a blank sample, and the ratio of the content of the object to be measured obtained by detecting the sample according to the steps to the known content is the recovery rate) and the relative standard deviation of the object to be measured are examined. Test results show that the extraction head still maintains good thermal stability at 70 ℃. The linear range of the method for the low-molecular chlorinated organic matters in the paper making white water is 0.1-10 mu g/L, the linearity is good, and the linear correlation coefficient R is20.9960-0.9991, the recovery rate of the added standard is 80.1-102.4%, and the relative standard deviation is 255% -4.97%, and the detection limit is 0.0136-0.0364 mug/L, and the data show that the method has better precision, stability and reproducibility, and can be used for accurately measuring low-molecular chlorinated organic matters in the papermaking white water. The recovery rates of the assay of the invention with spiking are shown in table 1.
TABLE 1 recovery test results
Example 2
The assay was carried out as in example 1, except that: the time of Solid Phase Microextraction (SPME) in the step (2) is 10, 20, 30, 40, 50 and 60 min. The detection signal is shown in fig. 4. In the SPME process, the maximum volatilization of the volatile substances into the headspace is generally ensured by increasing the extraction time to improve the detection sensitivity, but as can be seen from fig. 4, the sensitivity of 1,2, 3-trichloropropane is significantly reduced after 40min, and the DCP is gradually increased, which is the manifestation of adsorption competition, and the optimal extraction time is 40min in order to ensure the accurate detection of the two substances.
Example 3
The assay was carried out as in example 1, except that: in the step (1), NaCl with the mass of 0.3 g, 0.6 g, 0.9 g, 1.2 g, 1.5 g, 1.8 g and 2.1 g is added in the pretreatment of the sample to be detected. The detection signal is shown in fig. 5. The ionic effect reduces the solubility of the material in water and the addition of a salt containing chlorine increases the volatility of chlorinated organics. As shown in FIG. 5, the addition of NaCl significantly increases the sensitivity of the two samples, so that the addition of NaCl can improve the detection sensitivity of low molecular chlorinated organic compounds in the white water.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. A method for rapidly detecting low-molecular chlorinated organic matters in papermaking white water is characterized by comprising the following steps:
(1) pretreatment of sample to be tested
Filtering the papermaking white water of a water sample to be detected to obtain a filtered papermaking white water sample; then, putting the paper making white water sample into a headspace bottle, adding chloride, and balancing for 10-60 min at 35-70 ℃ to obtain a sample to be detected;
(2) preparing standard solution
Adding 1, 3-dichloro-2-propanol and 1,2, 3-trichloropropane into papermaking white water, and preparing a mixed solution of 1, 3-dichloro-2-propanol and 1,2, 3-trichloropropane with at least 5 concentrations as a standard solution;
(3) solid phase microextraction-gas chromatography-mass spectrometry detection
Respectively extracting the sample to be detected obtained in the step (1) and the standard solution obtained in the step (2) for 40min at 40 ℃ by adopting a headspace solid-phase microextraction mode; then inserting an extraction head of the standard solution obtained after extraction into a sample inlet of a gas chromatography-mass spectrometer for desorption, carrying out gas chromatography-mass spectrometer detection, and carrying out regression analysis according to the chromatographic peak area of the standard solution corresponding to the concentration of the standard solution to obtain a standard working curve; then inserting an extraction head of a sample to be detected obtained after extraction into an injection port of a gas chromatography-mass spectrum for desorption under the same condition, measuring the gas chromatography-mass spectrum, comparing the result with a standard working curve, and calculating the content of the 1, 3-dichloro-2-propanol and the 1,2, 3-trichloropropane in the sample;
the gas chromatography-mass spectrometry conditions in the step (3) are as follows:
the temperature rising procedure is as follows: keeping the temperature at 35 ℃ for 1min, heating to 180 ℃ at 10 ℃/min for 3min, and heating to 240 ℃ at 15 ℃/min for 1 min;
a chromatographic column: DB-WAX chromatographic column with length of 30m and inner diameter of 0.25 mm; sample inlet temperature: 240 ℃;
the conditions of the gas chromatography-mass spectrometry in the step (3) are as follows: EI (El)+An ion source; single quadrupole mass spectrometry detection; the energy is 70 eV; monitoring full-scanning ions;
the desorption conditions in the step (3) are as follows: desorbing at 240 deg.C for 6 min.
2. The method for rapidly detecting low-molecular chlorinated organic compounds in papermaking white water according to claim 1, characterized in that:
the chloride salt in the step (1) is NaCl;
and (3) the papermaking white water in the step (2) is the papermaking white water generated by the non-wet strength agent during papermaking of paper.
3. The method for rapidly detecting low-molecular chlorinated organic compounds in papermaking white water according to claim 2, characterized in that:
the mass ratio of the NaCl to the papermaking white water sample is 0.3-2.1: 1 to 10.
4. The method for rapidly detecting low-molecular chlorinated organic compounds in papermaking white water according to claim 3, characterized in that:
the mass ratio of the NaCl to the papermaking white water sample is 0.3-2.1: 5.
5. the method for rapidly detecting low-molecular chlorinated organic compounds in papermaking white water according to claim 1, characterized in that:
the concentration ranges of the 1, 3-dichloro-2-propanol and the 1,2, 3-trichloropropane in the standard solution in the step (2) are 0.1-10 mu g/L.
6. The method for rapidly detecting low-molecular chlorinated organic compounds in papermaking white water according to claim 5, characterized in that:
the concentration matching of 1, 3-dichloro-2-propanol and 1,2, 3-trichloropropane in the standard solution in the step (2) is as follows: 0.1. mu.g/L/0.1. mu.g/L, 0.5. mu.g/L/0.5. mu.g, 1. mu.g/L/1. mu.g/L, 2. mu.g/L/2. mu.g, 3. mu.g/L/3. mu.g, 4. mu.g/L/4. mu.g, 5. mu.g/L/5. mu.g/L, 10. mu.g/L/10. mu.g/L.
7. The method for rapidly detecting low-molecular chlorinated organic compounds in papermaking white water according to claim 1, characterized in that:
the balance condition in the step (1) is as follows: equilibrating at 40 deg.C for 60 min;
the extraction head in the step (3) is an 85-micron Carboxen/PDMS extraction head, an 85-micron polyacrylate extraction head or a 65-micron PDMS/DVB extraction head.
8. The application of the method for rapidly detecting the low-molecular chlorinated organic compounds in the paper-making white water according to any one of claims 1 to 7 in detecting the low-molecular chlorinated organic compounds in the paper-making white water is characterized in that: the low molecular weight chlorinated organic compounds are 1, 3-dichloro-2-propanol and 1,2, 3-trichloropropane.
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