CN113281279A - Soil heavy metal content detection method for environment detection - Google Patents
Soil heavy metal content detection method for environment detection Download PDFInfo
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- CN113281279A CN113281279A CN202110550130.2A CN202110550130A CN113281279A CN 113281279 A CN113281279 A CN 113281279A CN 202110550130 A CN202110550130 A CN 202110550130A CN 113281279 A CN113281279 A CN 113281279A
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01N1/40—Concentrating samples
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4077—Concentrating samples by other techniques involving separation of suspended solids
- G01N2001/4088—Concentrating samples by other techniques involving separation of suspended solids filtration
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Abstract
The invention belongs to the field of soil heavy metal content detection, and particularly relates to a soil heavy metal content detection method for environment detection, which comprises the following steps: s1: firstly, carrying out gridding division on an area to be detected to obtain small grid detection blocks; s2: utilizing soil sampling equipment to perform depth setting on each grid detection block to take out a soil sample; s3: and respectively drying the soil sample taken out from each grid detection block in the step S2 by using a drying device to obtain a dried soil sample. Compared with the conventional method for detecting the content of the heavy metal in the soil for environment detection, the method has the advantages of high detection accuracy and simplicity in operation.
Description
Technical Field
The invention relates to the technical field of soil heavy metal content detection, in particular to a soil heavy metal content detection method for environment detection.
Background
Soil is the most important natural resource of the earth, is the material foundation on which human beings rely for survival, and is an important component of the natural environment. The soil safety is the basic guarantee of the safety of agricultural products. With the development of economy, the problem of heavy metal pollution of soil in China is increasingly highlighted, the content of heavy metal in the soil is an important index for evaluating the soil pollution condition, and the existing soil heavy metal content detection method for environment detection has the problems of low detection accuracy and inconvenient operation, so that the soil heavy metal content detection method for environment detection is provided.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a soil heavy metal content detection method for environment detection.
In order to achieve the purpose, the invention adopts the following technical scheme:
a soil heavy metal content detection method for environment detection comprises the following steps:
s1: firstly, carrying out gridding division on an area to be detected to obtain small grid detection blocks;
s2: utilizing soil sampling equipment to perform depth setting on each grid detection block to take out a soil sample;
s3: respectively drying the soil sample taken out from each grid detection block in the S2 by using a drying device to obtain a dried soil sample;
s4: grinding the dried soil sample in the S3 by using grinding equipment to obtain a powdery soil sample, and then sieving the powdery soil sample by using a screen;
s5: respectively taking out 1-2g of the soil samples after the sieving operation, sequentially putting each 1-2g of the soil samples into a plurality of corresponding Xpress reaction tanks, respectively putting 15-20ml of deionized water into each Xpress reaction tank, starting the Xpress reaction tanks, mixing and stirring the soil samples and the deionized water by the Xpress reaction tanks, simultaneously adding 10-12ml of HCL and 8-10ml of HNO3 into the Xpress reaction tanks in the stirring process until the mixture in the Xpress reaction tanks is uniformly mixed, and then closing the tank covers of the Xpress reaction tanks;
s6: sequentially carrying out digestion operation on the plurality of Xpress reaction tanks in the S5 by using a microwave digestion instrument, and carrying out filtration operation on the plurality of Xpress reaction tanks subjected to digestion operation by using a filter device to obtain digestion liquid;
s7: the digestion solution and ultrapure water in S6 were mixed in the following ratio of 1: diluting at a ratio of 30-50 to obtain a diluent;
s8: and (4) respectively measuring the heavy metal content of the multiple diluted solutions in the S7 by using a flame atomic absorption spectrometry, and finally averaging the results of the heavy metal content to obtain the heavy metal content value of the soil in the area to be detected.
Preferably, in S2, the soil sampling device is a sampling device capable of sampling at a fixed depth.
Preferably, in S3, the drying device is a dryer that performs drying by using microwave technology.
Preferably, in S4, the grinding device is a high-speed grinding device, the rotation speed of the grinding device is set to 8000-.
Preferably, in the S4, the screen is a 90-100 mesh screen.
Preferably, in the step S6, the initial temperature of the microwave digestion instrument is set to be 25-35 ℃, the microwave digestion instrument is heated at a rate of 0.5-0.8 ℃/S on the basis of the initial temperature until the internal temperature of the microwave digestion instrument reaches 160 ℃ of 130-.
Preferably, in S6, the filtering device is a ceramic membrane filter.
Preferably, in S7, the optimal dilution ratio of the digestion solution to the ultrapure water is 1: 40.
compared with the conventional method for detecting the content of the heavy metal in the soil for environment detection, the method has the advantages of high detection accuracy and simplicity in operation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example one
The embodiment provides a soil heavy metal content detection method for environment detection, which comprises the following steps:
s1: firstly, carrying out gridding division on an area to be detected to obtain small grid detection blocks;
s2: utilizing sampling equipment capable of sampling at a fixed depth to perform fixed depth on each grid detection block and taking out a soil sample;
s3: respectively drying the soil sample taken out of each grid detection block in the S2 by using a drying device, wherein the drying device is a dryer which adopts a microwave technology to dry, so as to obtain a dried soil sample;
s4: grinding the dried soil sample in the S3 by using high-speed grinding equipment, wherein the rotating speed of the high-speed grinding equipment is set to 8000r/min, the internal temperature is set to 30 ℃, obtaining a powdery soil sample, and then sieving the powdery soil sample by using a 90-100-mesh sieve;
s5: respectively taking out 1g of the soil samples after the sieving operation, sequentially putting each 1g of the soil samples into a plurality of corresponding Xpress reaction tanks, respectively putting 20ml of deionized water into each Xpress reaction tank, starting the Xpress reaction tanks, mixing and stirring the soil samples and the deionized water by the Xpress reaction tanks, simultaneously adding 12ml of HCL and 10ml of HNO3 into the Xpress reaction tanks in the stirring process until the mixture in the Xpress reaction tanks is uniformly mixed, and then closing the tank covers of the Xpress reaction tanks;
s6: carrying out digestion operation on a plurality of Xpress reaction tanks in S5 by using a microwave digestion instrument in sequence, wherein the initial temperature of the microwave digestion instrument is set to 35 ℃, the microwave digestion instrument is heated at the speed of 0.8 ℃/S on the basis of the initial temperature until the internal temperature of the microwave digestion instrument reaches 160 ℃, then the microwave digestion instrument is kept warm for 6min at the temperature of 160 ℃, the microwave digestion instrument is cooled to the room temperature at the speed of 3 ℃/S, and the plurality of Xpress reaction tanks subjected to digestion operation are filtered by using a ceramic membrane filter to obtain digestion liquid;
s7: the digestion solution and ultrapure water in S6 were mixed in the following ratio of 1: diluting at the ratio of 30 to obtain a diluent;
s8: and (4) respectively measuring the heavy metal content of the multiple diluted solutions in the S7 by using a flame atomic absorption spectrometry, and finally averaging the results of the heavy metal content to obtain the heavy metal content value of the soil in the area to be detected.
Example two
The embodiment provides a soil heavy metal content detection method for environment detection, which comprises the following steps:
s1: firstly, carrying out gridding division on an area to be detected to obtain small grid detection blocks;
s2: utilizing sampling equipment capable of sampling at a fixed depth to perform fixed depth on each grid detection block and taking out a soil sample;
s3: respectively drying the soil sample taken out of each grid detection block in the S2 by using a drying device, wherein the drying device is a dryer which adopts a microwave technology to dry, so as to obtain a dried soil sample;
s4: grinding the dried soil sample in the S3 by using high-speed grinding equipment, wherein the rotating speed of the high-speed grinding equipment is set to 10000r/min, the internal temperature is set to 25 ℃, obtaining a powdery soil sample, and then sieving the powdery soil sample by using a 90-100-mesh sieve;
s5: respectively taking out 1.5g of the soil samples after the sieving operation, sequentially putting each 1.5g of the soil samples into a plurality of corresponding Xpress reaction tanks, respectively putting 17.5ml of deionized water into each Xpress reaction tank, starting the Xpress reaction tanks, mixing and stirring the soil samples and the deionized water by the Xpress reaction tanks, simultaneously adding 11ml of HCL and 9ml of HNO3 into the Xpress reaction tanks in the stirring process of the Xpress reaction tanks until the mixture in the Xpress reaction tanks is uniformly mixed, and then closing the tank covers of the Xpress reaction tanks;
s6: carrying out digestion operation on a plurality of Xpress reaction tanks in S5 by using a microwave digestion instrument in sequence, wherein the initial temperature of the microwave digestion instrument is set to be 30 ℃, the microwave digestion instrument is heated at the speed of 0.75 ℃/S on the basis of the initial temperature until the internal temperature of the microwave digestion instrument reaches 145 ℃, then the microwave digestion instrument is kept at the temperature of 145 ℃ for 5min, the microwave digestion instrument is cooled to room temperature at the speed of 2.5 ℃/S, and the plurality of Xpress reaction tanks subjected to digestion operation are filtered by using a ceramic membrane filter to obtain digestion liquid;
s7: the digestion solution and ultrapure water in S6 were mixed in the following ratio of 1: diluting according to the proportion of 40 to obtain a diluent;
s8: and (4) respectively measuring the heavy metal content of the multiple diluted solutions in the S7 by using a flame atomic absorption spectrometry, and finally averaging the results of the heavy metal content to obtain the heavy metal content value of the soil in the area to be detected.
EXAMPLE III
The embodiment provides a soil heavy metal content detection method for environment detection, which comprises the following steps:
s1: firstly, carrying out gridding division on an area to be detected to obtain small grid detection blocks;
s2: utilizing sampling equipment capable of sampling at a fixed depth to perform fixed depth on each grid detection block and taking out a soil sample;
s3: respectively drying the soil sample taken out of each grid detection block in the S2 by using a drying device, wherein the drying device is a dryer which adopts a microwave technology to dry, so as to obtain a dried soil sample;
s4: grinding the dried soil sample in the S3 by using high-speed grinding equipment, wherein the rotating speed of the high-speed grinding equipment is set to be 12000r/min, the internal temperature is set to be 20 ℃, obtaining a powdery soil sample, and then sieving the powdery soil sample by using a 90-100-mesh sieve;
s5: respectively taking out 2g of the soil samples after the sieving operation, sequentially putting each 2g of the soil samples into a plurality of corresponding Xpress reaction tanks, respectively putting 15ml of deionized water into each Xpress reaction tank, starting the Xpress reaction tanks, mixing and stirring the soil samples and the deionized water by the Xpress reaction tanks, simultaneously adding 10ml of HCL and 8ml of HNO3 into the Xpress reaction tanks in the stirring process until the mixture in the Xpress reaction tanks is uniformly mixed, and then closing the tank covers of the Xpress reaction tanks;
s6: carrying out digestion operation on a plurality of Xpress reaction tanks in S5 by using a microwave digestion instrument in sequence, wherein the initial temperature of the microwave digestion instrument is set to be 25 ℃, the microwave digestion instrument is heated at the speed of 0.5 ℃/S on the basis of the initial temperature until the internal temperature of the microwave digestion instrument reaches 130 ℃, then the microwave digestion instrument is kept at the temperature of 130 ℃ for 4min, the microwave digestion instrument is cooled to the room temperature at the speed of 2 ℃/S, and the plurality of Xpress reaction tanks subjected to digestion operation are filtered by using a ceramic membrane filter to obtain digestion liquid;
s7: the digestion solution and ultrapure water in S6 were mixed in the following ratio of 1: diluting at the ratio of 50 to obtain a diluent;
s8: and (4) respectively measuring the heavy metal content of the multiple diluted solutions in the S7 by using a flame atomic absorption spectrometry, and finally averaging the results of the heavy metal content to obtain the heavy metal content value of the soil in the area to be detected.
Compared with the conventional soil heavy metal content detection method for environment detection, the soil heavy metal content detection method for environment detection provided by the first embodiment to the third embodiment has the advantages of high detection accuracy and simplicity in operation, wherein the second embodiment is the best embodiment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A method for detecting the heavy metal content of soil for environment detection is characterized by comprising the following steps:
s1: firstly, carrying out gridding division on an area to be detected to obtain small grid detection blocks;
s2: utilizing soil sampling equipment to perform depth setting on each grid detection block to take out a soil sample;
s3: respectively drying the soil sample taken out from each grid detection block in the S2 by using a drying device to obtain a dried soil sample;
s4: grinding the dried soil sample in the S3 by using grinding equipment to obtain a powdery soil sample, and then sieving the powdery soil sample by using a screen;
s5: respectively taking out 1-2g of the soil samples after the sieving operation, sequentially putting each 1-2g of the soil samples into a plurality of corresponding Xpress reaction tanks, respectively putting 15-20ml of deionized water into each Xpress reaction tank, starting the Xpress reaction tanks, mixing and stirring the soil samples and the deionized water by the Xpress reaction tanks, simultaneously adding 10-12ml of HCL and 8-10ml of HNO3 into the Xpress reaction tanks in the stirring process until the mixture in the Xpress reaction tanks is uniformly mixed, and then closing the tank covers of the Xpress reaction tanks;
s6: sequentially carrying out digestion operation on the plurality of Xpress reaction tanks in the S5 by using a microwave digestion instrument, and carrying out filtration operation on the plurality of Xpress reaction tanks subjected to digestion operation by using a filter device to obtain digestion liquid;
s7: the digestion solution and ultrapure water in S6 were mixed in the following ratio of 1: diluting at a ratio of 30-50 to obtain a diluent;
s8: and (4) respectively measuring the heavy metal content of the multiple diluted solutions in the S7 by using a flame atomic absorption spectrometry, and finally averaging the results of the heavy metal content to obtain the heavy metal content value of the soil in the area to be detected.
2. The method as claimed in claim 1, wherein in step S2, the soil sampling device is a sampling device capable of sampling at a fixed depth.
3. The method as claimed in claim 1, wherein in S3, the drying device is a dryer that dries by microwave technology.
4. The method as claimed in claim 1, wherein in S4, the grinding device is a high speed grinding device, the rotation speed of the grinding device is 8000-.
5. The method for detecting the content of the heavy metal in the soil for environmental testing as recited in claim 1, wherein the screen of S4 is a 90-100 mesh screen.
6. The method as claimed in claim 1, wherein in S6, the initial temperature of the microwave digestion instrument is set to 25-35 ℃, the microwave digestion instrument is heated at a rate of 0.5-0.8 ℃/S based on the initial temperature until the internal temperature of the microwave digestion instrument reaches 130-.
7. The method for detecting the content of heavy metals in soil for environmental testing as claimed in claim 1, wherein in S6, the filtering device is a ceramic membrane filter.
8. The method for detecting the content of heavy metal in soil for environmental monitoring as recited in claim 1, wherein in S7, the optimal dilution ratio of the digestion solution to the ultrapure water is 1: 40.
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| CN114354247A (en) * | 2021-12-16 | 2022-04-15 | 江苏朗地环境技术服务有限公司 | Soil detection method and application thereof |
| CN114667905A (en) * | 2022-03-04 | 2022-06-28 | 王卫星 | Control system for supplementing oxygen to vegetable root system by utilizing drip irrigation pipeline |
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