CN110470768B - Method for measuring residual amounts of pyrazosulfuron-ethyl, triazophos and butachlor in water - Google Patents
Method for measuring residual amounts of pyrazosulfuron-ethyl, triazophos and butachlor in water Download PDFInfo
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Abstract
The invention provides a method for measuring residual amounts of pyrazosulfuron-ethyl, triazophos and butachlor in water, belonging to the technical field of water quality detection methods. The method comprises the following steps: preparing a sample, preparing a standard working solution, testing the standard working solution in the second step by adopting ultra performance liquid chromatography-tandem mass spectrometry, drawing a standard curve by taking the peak areas of various targets as vertical coordinates and corresponding concentrations as horizontal coordinates, and quantifying by an external standard method; and (3) performing ultra performance liquid chromatography-tandem mass spectrometry on the sample to be detected in the first step under the same conditions, measuring the chromatographic peak areas of the pyrazosulfuron-ethyl, the triazophos and the butachlor in the sample to be detected, and substituting the chromatographic peak areas into a standard curve to obtain the content of the pyrazosulfuron-ethyl, the triazophos and the butachlor in the sample to be detected. The detection limit of the method is 0.1 mug/L, the quantification limit is 0.3 mug/L, the detection cost is low, and the method is accurate.
Description
Technical Field
The invention belongs to the technical field of water quality detection methods, and particularly relates to a method for measuring residual amounts of pyrazosulfuron-ethyl, triazophos and butachlor in water.
Background
Pyrazosulfuron-ethyl (CAS number: 98389-04-9) belongs to sulfonylurea herbicides, and is suitable for crops: the rice seedling field, direct seeding field and transplanting field are selective internal absorption conduction type herbicides, which are absorbed mainly by root systems and quickly transferred in the body of weed plants to inhibit growth, and weeds gradually die. The rice can decompose the pesticide, and has little influence on the growth of rice, and the effective period is 25-35 days. The stability is that the product can be stabilized for half a year at 50 ℃ and is stable to light. The structural formula of pyrazosulfuron-ethyl is as follows:
triazophos (CAS number: 24017-47-8) is a broad-spectrum organic phosphorus pesticide, acaricide, nematicide, and is mainly used for preventing and treating lepidoptera pests, mites, fly larvae, underground pests and the like on fruit trees, cotton and grain crops. The pure product is light yellow liquid, can be dissolved in most organic solvents, is stable to light, can be hydrolyzed in acid and alkali media, is harmful to the environment at 140 ℃, and is particularly concerned about the pollution to water bodies. The structural formula of the triazophos is as follows:
butachlor (CAS number: 23184-66-9), Chinese alias, bentazon, norbenazon, selective preemergent herbicides. Is insoluble in water and soluble in various organic solvents. Stable chemical property under normal temperature and neutral and alkalescent conditions. The decomposition of the organic acid is accelerated under the strong acid condition, and the organic acid can be degraded in soil. Is mainly used for preventing and killing annual gramineous weeds and certain broadleaf weeds in direct seeding or transplanting paddy fields. It is also selective for wheat, barley, beet, cotton, peanut and cabbage crops. The effective dose is 1.0-4.5kg (effective component) per hectare. The herbicide is generally used for treating the surface of soil before germination, can be applied after seedling emergence in paddy fields and is an important variety of herbicides in paddy fields. Butachlor has the following structural formula:
in the prior art, a method for detecting the residual quantity of pyrazosulfuron-ethyl, triazophos and butachlor in water is not available.
Disclosure of Invention
The invention aims to provide a method for measuring the residual amounts of pyrazosulfuron-ethyl, triazophos and butachlor in water, which is simple and convenient, high in sensitivity and good in repeatability.
The invention provides a method for measuring the residual quantity of pyrazosulfuron-ethyl, triazophos and butachlor in water, which comprises the following steps:
the method comprises the following steps: sample preparation
Weighing a water sample, adding acetic acid acetonitrile for extraction, adding sodium chloride for salting out, transferring an upper layer organic phase, repeatedly extracting for two times, combining two extraction solutions, drying by using nitrogen, adding a methanol water solution for constant volume, and filtering by using a membrane to obtain a sample to be detected; the volume ratio of the water sample to the acetic acid acetonitrile is 2: 1; volume mL of water sample: the mass g of sodium chloride is 50: 15; the volume ratio of the water sample to the methanol aqueous solution is 50: 1;
step two: preparation of standard working solution
Standard solution: firstly, preparing pyrazosulfuron-ethyl, triazophos and butachlor standard solutions with the concentration of 100mg/L respectively;
standard stock solutions: 1mL of the pyrazosulfuron-ethyl, triazophos and butachlor standard solutions are respectively put into a volumetric flask, dissolved by methanol and fixed to the volume to be calibrated, and prepared into standard stock solution with the concentration of 10 mg/L;
mixing standard intermediate liquid: 1mL of each standard stock solution is taken to be placed in a volumetric flask, methanol is dissolved and the volume is determined to scale, and a mixed standard intermediate solution with the concentration of 1000ng/mL is prepared;
drawing a standard curve: sucking a certain volume of liquid from the mixed standard intermediate liquid to prepare 5, 10, 20, 50 and 100ng/mL series of standard working liquids;
step three: measurement of
Testing the standard working solution in the second step by adopting ultra performance liquid chromatography-tandem mass spectrometry, drawing a standard curve by taking the peak areas of various target objects as vertical coordinates and the corresponding concentrations as horizontal coordinates, and quantifying by adopting an external standard method;
carrying out ultra performance liquid chromatography-tandem mass spectrometry on the sample to be detected in the first step under the same conditions, measuring the chromatographic peak areas of pyrazosulfuron-ethyl, triazophos and butachlor in the sample to be detected, and bringing the chromatographic peak areas into a standard curve to obtain the content of pyrazosulfuron-ethyl, triazophos and butachlor in the sample to be detected;
the determination conditions are as follows:
ultra-high performance liquid chromatography conditions
A chromatographic column: waters BEH C182.1mm x 50mm,1.7 μm, or equivalent performance columns;
flow rate: 0.25 mL/min;
sample introduction amount: 10 mu L of the solution;
column temperature: 40 ℃;
mobile phase: acetonitrile and 0.1% formic acid, gradient elution, as in Table 1
TABLE 1 gradient elution procedure
| Time | Acetonitrile | 0.1% formic acid water |
| 0 | 5 | 95 |
| 0.5 | 5 | 95 |
| 3.0 | 100 | 0 |
| 3.1 | 5 | 95 |
| 4.0 | 5 | 95 |
Conditions of Mass Spectrometry
An ion source: ESI;
the scanning mode is as follows: scanning positive ions;
the detection mode comprises the following steps: monitoring multiple reactions;
atomizer pressure: 50 psi;
flow rate of drying gas: 12L/min;
temperature of the drying gas: 350 ℃;
capillary voltage: 4000V;
monitoring ion pairs, cone hole voltage and collision energy, see table 2;
TABLE 2 monitoring ion Pair, Cone hole Voltage and Collision energy
Note: is a quantitative ion
Preferably, the water sample is surface water.
Preferably, the volume fraction of acetonitrile acetate in the first step is 1%.
Preferably, the volume fraction of methanol in the first step is 20%.
Preferably, the temperature for blowing the nitrogen gas is 40 ℃.
Preferably, the filter is a 0.22 μm filter.
The invention has the advantages of
The invention provides a method for measuring the residual quantity of pyrazosulfuron-ethyl, triazophos and butachlor in water, which has high sensitivity, the detection limit of the method for measuring pyrazosulfuron-ethyl, triazophos and butachlor in surface water is 0.1 mu g/L, the quantification limit is 0.3 mu g/L, the detection cost is low, and the method is accurate.
Drawings
FIG. 1 is a total ion current chromatogram of pyrazosulfuron-ethyl, triazophos and butachlor standard substances in example 1 of the invention;
FIG. 2 is an ion mass spectrum of a pyrazosulfuron-ethyl standard substance in example 1 of the present invention under MRM mode;
FIG. 3 is an ion mass spectrum of triazophos standard substance in example 1 of the present invention in MRM mode;
FIG. 4 is an ion mass spectrum of the butachlor standard substance in the example 1 of the invention in MRM mode.
Detailed Description
The present invention will be described in further detail with reference to specific examples, it should be understood that the present invention is not limited to the examples, but is capable of modification and variation in various forms without departing from the scope of the present invention.
The reagents used in the examples, unless otherwise indicated, were analytically pure and the water should conform to the secondary water specification of GB/T6682.
Acetonitrile: carrying out chromatographic purification; methanol: carrying out chromatographic purification; sodium chloride: analyzing and purifying; acetic acid: the top grade is pure;
example 1
A method for measuring residual amounts of pyrazosulfuron-ethyl, triazophos and butachlor in water comprises the following steps:
the method comprises the following steps: sample preparation
A ground glass bottle is used for collecting a water sample, the collected sample is stored in a refrigerator at 4 ℃, and the transportation process of the sample needs to be shockproof, stored at low temperature and protected from sunlight irradiation, and the inside of a transport vehicle is prevented from being polluted. All samples were collected in duplicate, with one full procedure blank and one transport blank for each batch.
Measuring 10mL of acetic acid by using a measuring cylinder, pouring the acetic acid into a 1000mL volumetric flask, adding acetonitrile to a constant volume, uniformly mixing, and pouring into a 1% acetonitrile acetate special bottle;
transferring 50.00mL of a uniform sample by using a big belly pipette, adding the uniform sample into a 250mL separating funnel, accurately adding 25.00mL of 1% (volume fraction) acetic acid acetonitrile, carrying out vortex mixing, adding 15g of sodium chloride, carrying out vortex mixing, salting out, accurately transferring an upper layer organic phase, repeatedly extracting for two times, combining two extraction solutions, drying by blowing nitrogen at 40 ℃, adding 1.00mL of 20% (volume fraction) methanol aqueous solution for constant volume, and passing through a 0.22 mu m filter membrane to obtain a sample to be detected;
step two: preparation of standard working solution
Standard solution: firstly, preparing pyrazosulfuron-ethyl, triazophos and butachlor standard solutions with the concentration of 100mg/L respectively;
standard stock solutions: 1mL of the pyrazosulfuron-ethyl, triazophos and butachlor standard solutions are respectively put into a 10mL volumetric flask, dissolved by methanol, and fixed to a certain volume to be scaled to prepare a standard stock solution with the concentration of 10mg/L, and the standard stock solution is stored in a refrigerator at 4 ℃ in a dark place;
mixing standard intermediate liquid: taking 1mL of each standard stock solution, putting the standard stock solutions into a 10mL volumetric flask, dissolving the methanol, fixing the volume to a scale, preparing a mixed standard intermediate solution with the concentration of 1000ng/mL, and storing the mixed standard intermediate solution in a refrigerator at 4 ℃ in a dark place;
drawing a standard curve: sucking a certain volume of liquid from the mixed standard intermediate liquid to prepare 5, 10, 20, 50 and 100ng/mL series of standard working solutions;
step three: measurement of
Testing the standard working solution obtained in the second step by adopting ultra-high performance liquid chromatography-tandem mass spectrometry to obtain a total ion current chromatogram of pyrazosulfuron-ethyl, triazophos and butachlor standard substances in the standard working solution and an ion mass chromatogram of the pyrazosulfuron-ethyl, triazophos and butachlor standard substances in an MRM (multi-resolution mass spectrometry) mode, as shown in figures 1-4, drawing a standard curve by taking the peak areas of various targets as vertical coordinates and the corresponding concentrations as horizontal coordinates, and quantifying by adopting an external standard method, wherein the standard curve equation is shown in table 3;
TABLE 3
| Name (R) | Regression equation | Correlation coefficient |
| Pyrazosulfuron-ethyl | Y＝5623.45x-3725.46 | 0.9996 |
| Triazophos | Y＝928.46x-6901.74 | 0.9997 |
| Butachlor | Y＝579.63x-783.22 | 0.9997 |
The detection limit of the method is 0.1 mug/L, and the quantification limit is 0.3 mug/L;
carrying out ultra performance liquid chromatography-tandem mass spectrometry on the sample to be detected in the first step under the same conditions, measuring the chromatographic peak areas of pyrazosulfuron-ethyl, triazophos and butachlor in the sample to be detected, and substituting the chromatographic peak areas into a linear equation to obtain the content of pyrazosulfuron-ethyl, triazophos and butachlor in the sample to be detected;
quantifying by an external standard method, and calculating the content of the target object in the sample according to the following formula:
in the formula:
x is the content of the substance to be detected in the sample, and the unit is microgram per liter (mu g/L);
c-the concentration of analyte in the sample solution obtained from the standard working curve in nanograms per milliliter (ng/mL);
v-volume volumetric volume in milliliters (mL);
V0-sample volume in milliliters (mL);
f is dilution multiple; (f 1)
The determination conditions are as follows:
ultra-high performance liquid chromatography conditions
A chromatographic column: waters BEH C182.1mm x 50mm,1.7 μm, or equivalent performance columns;
flow rate: 0.25 mL/min;
sample introduction amount: 10 mu L of the solution;
column temperature: 40 ℃;
mobile phase: acetonitrile and 0.1% formic acid water, gradient elution, as in table 2;
TABLE 2 gradient elution procedure
Conditions of Mass Spectrometry
An ion source: ESI;
the scanning mode is as follows: scanning positive ions;
the detection mode is as follows: monitoring multiple reactions;
atomizer pressure: 50 psi;
flow rate of drying gas: 12L/min;
temperature of the drying gas: 350 ℃;
capillary voltage: 4000V;
ion pairs, cone hole voltage and collision energy were monitored, see table 3;
TABLE 3 monitoring ion Pair, Cone hole Voltage and Collision energy
Note: is a quantitative ion
The surface waters from 5 different locations, labeled surface waters No. 1, No. 2, No. 3, No. 4 and No. 5, were measured as described in example 1 above, 5 consecutive measurements were made for each sample, and the average of the 5 measurements (in μ g/L) was taken, with the results shown in table 4:
TABLE 4
| Number 1 | Number 2 | Number 2 | Number 4 | Number 5 | |
| Pyrazosulfuron-ethyl | 20.59 | 20.6 | 20.63 | 20.61 | 20.62 |
| Triazophos | 18.45 | 18.47 | 18.44 | 18.46 | 18.45 |
| Butachlor | 19.20 | 19.22 | 19.23 | 19.21 | 19.23 |
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (6)
1. A method for measuring residual amounts of pyrazosulfuron-ethyl, triazophos and butachlor in water is characterized by comprising the following steps:
the method comprises the following steps: sample preparation
Weighing a water sample, adding acetic acid acetonitrile for extraction, adding sodium chloride for salting out, transferring an upper layer organic phase, repeatedly extracting for two times, combining two extraction solutions, drying by using nitrogen, adding a methanol water solution for constant volume, and filtering by using a membrane to obtain a sample to be detected; the volume ratio of the water sample to the acetic acid acetonitrile is 2: 1; volume mL of water sample: the mass g of sodium chloride is 50: 15; the volume ratio of the water sample to the methanol aqueous solution is 50: 1;
step two: preparation of standard working solution
Standard solution: firstly, preparing pyrazosulfuron-ethyl, triazophos and butachlor standard solutions with the concentration of 100mg/L respectively;
standard stock solutions: 1mL of the pyrazosulfuron-ethyl, triazophos and butachlor standard solutions are respectively put into a volumetric flask, dissolved by methanol and fixed to the volume to be calibrated, and prepared into standard stock solution with the concentration of 10 mg/L;
mixing standard intermediate liquid: taking 1mL of each standard stock solution, dissolving in methanol, fixing the volume to a scale, and preparing a mixed standard intermediate solution with the concentration of 1000 ng/mL;
drawing a standard curve: sucking a certain volume of liquid from the mixed standard intermediate liquid to prepare 5, 10, 20, 50 and 100ng/mL series of standard working solutions;
step three: measurement of
Testing the standard working solution in the second step by adopting ultra performance liquid chromatography-tandem mass spectrometry, drawing a standard curve by taking the peak areas of various target objects as vertical coordinates and the corresponding concentrations as horizontal coordinates, and quantifying by adopting an external standard method;
carrying out ultra performance liquid chromatography-tandem mass spectrometry on the sample to be detected in the first step under the same conditions, measuring the chromatographic peak areas of pyrazosulfuron-ethyl, triazophos and butachlor in the sample to be detected, and bringing the chromatographic peak areas into a standard curve to obtain the content of pyrazosulfuron-ethyl, triazophos and butachlor in the sample to be detected;
the determination conditions are as follows:
ultra-high performance liquid chromatography conditions
A chromatographic column: waters BEH C182.1mm x 50mm,1.7 μm, or equivalent performance columns;
flow rate: 0.25 mL/min;
sample introduction amount: 10 mu L of the solution;
column temperature: at 40 ℃;
mobile phase: acetonitrile and 0.1% formic acid, gradient elution, as in Table 1
TABLE 1
Mass spectrum conditions:
an ion source: ESI;
the scanning mode is as follows: scanning positive ions;
the detection mode is as follows: monitoring multiple reactions;
atomizer pressure: 50 psi;
flow rate of drying gas: 12L/min;
temperature of the drying gas: 350 ℃;
capillary voltage: 4000V;
monitoring ion pairs, cone hole voltage and collision energy, see table 2;
TABLE 2
2. The method for determining the residual amounts of pyrazosulfuron-ethyl, triazophos and butachlor in water quality as claimed in claim 1, wherein the water sample is surface water.
3. The method for determining the residual quantity of pyrazosulfuron-ethyl, triazophos and butachlor in water according to claim 1, wherein the volume fraction of acetonitrile acetate in the first step is 1%.
4. The method for determining the residual quantity of pyrazosulfuron-ethyl, triazophos and butachlor in water as claimed in claim 1, wherein the volume fraction of methanol in the first step is 20%.
5. The method for measuring the residual amounts of pyrazosulfuron-ethyl, triazophos and butachlor in water quality as claimed in claim 1, wherein the temperature for drying nitrogen is 40 ℃.
6. The method for measuring the residual quantity of pyrazosulfuron-ethyl, triazophos and butachlor in water quality as claimed in claim 1, wherein the filter membrane is a 0.22 μm filter membrane.
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