CN114216955B - Laser in-situ micro-area Mg isotope determination method - Google Patents
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Abstract
The invention discloses a laser in-situ micro-area Mg isotope determination method, which comprises the following steps: carrying out laser ablation on the standard sample and the sample to obtain standard sample aerosol particles and sample aerosol particles; atomizing water to obtain water aerosol particles; mixing the standard sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry to obtain standard sample mass spectrometry data; mixing the sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry to obtain sample mass spectrometry data; and correcting the sample mass spectrum data by using the external standard of the standard sample mass spectrum data to obtain the Mg isotope composition of the sample. The laser in-situ micro-area Mg isotope determination method provided by the invention eliminates mass spectrum interference and matrix effect, avoids adverse effects caused by overhigh mass resolution, solves the problem of extremely deficient matrix matching standard substances, improves the spatial resolution, and can be widely popularized.
Description
Technical Field
The invention relates to the technical field of chemical analysis, in particular to a laser in-situ micro-area Mg isotope determination method.
Background
Mg element is one of important constituent elements in the ocean, the land and the living body. Three stable isotopes of Mg 24 Mg(78.99％)、 25 Mg (10.00%) and 26 the maximum mass dispersion between Mg (11.01%) is about 8%, and Mg isotopes fractionate strongly in many geological processes (weathering, muddiness, hydrothermal alteration, mantle circulation, etc.). Therefore, mg isotope systems have been widely used in the tracing of various geological processes.
Mg isotope composition analysis generally adopts a chemical digestion sample, then the sample is purified by ion exchange resin, and multi-receiving inductively coupled plasma mass spectrometry is adopted for determination, however, the method belongs to whole rock integral analysis, and only the integral isotope composition information of rock or mineral can be obtained. Analysis of individual mineral particles on micrometer scaleThe Mg isotope composition in degree can provide information which cannot be obtained by whole rock analysis, and can provide unique visual angle and evidence for knowing specific geological evolution. In recent years, the micro-area in-situ Mg isotope analysis by using the secondary ion mass spectrometry technology has achieved important research results in the research of single minerals such as olivine, pyroxene and the like, and the precision of the in-situ micro-area Mg isotope reaches up to 0.2 per thousand, so that the micro-area in-situ Mg isotope analysis has become the main testing technology of the in-situ micro-area Mg isotope analysis at present. However, it has the disadvantages of higher price, less domestic quantity, stronger matrix effect, etc. With the development of instrument technology science, the laser ablation-multiple-receiving inductively coupled plasma mass spectrometry gradually becomes a 'potential strand' in the in-situ micro-area isotope determination technology by virtue of the advantages of weak matrix effect, low price, wide application and the like. However, the laser analysis process lacks a pretreatment separation and purification process, and the lack of the pretreatment separation and purification process causes the matrix elements to have important influence on the determination of the laser in-situ micro-area Mg isotope. Wherein the presence and complexity of the matrix element is such that it determines the accuracy (delta) of the Mg isotope 26 Mg:0.1-0.2 ‰) is far lower than the determination accuracy (delta) of the solution 26 Mg:0.02-0.06 thousandths). The existence of matrix elements mainly causes two problems of mass spectrum interference and matrix effect, so that how to simultaneously reduce the mass spectrum interference and the matrix effect is a key problem when the Mg isotope is measured in a laser in-situ micro-area.
Disclosure of Invention
The invention mainly aims to provide a laser in-situ micro-area Mg isotope determination method, and aims to provide a laser in-situ micro-area Mg isotope determination method capable of effectively reducing mass spectrum interference and matrix effect at the same time.
In order to achieve the purpose, the invention provides a laser in-situ micro-area Mg isotope determination method, which comprises the following steps:
carrying out laser ablation on the standard sample and the sample to obtain standard sample aerosol particles and sample aerosol particles;
atomizing water to obtain water aerosol particles;
mixing the standard sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry to obtain standard sample mass spectrometry data;
mixing the sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry to obtain sample mass spectrometry data;
and correcting the sample mass spectrum data by using the external standard of the standard sample mass spectrum data to obtain the Mg isotope composition of the sample.
Optionally, the water is ultrapure water.
Optionally, the laser ablation is performed using a femtosecond laser ablation system.
Optionally, the femtosecond laser ablation system is a 257nm 300fs yb.
Optionally, the laser ablation tank of the femtosecond laser ablation system is a double-volume ablation tank.
Optionally, the multi-receive inductively coupled plasma mass spectrometry detection employs low mass resolution.
Optionally, the standard sample comprises BHVO-2G basalt glass.
Optionally, the sample comprises one of basalt, andesite, cormatite and quartz amphibole.
Optionally, the basalt is one of BCR-2G basalt, BIR-1G basalt, KL2-G basalt and ML3B-G basalt, the andesite is StHs6/80-G andesite, the Komarite is one of GOR128-G Komarite and GOR132-G Komarite, and the quartz amphibole is T1-G quartz amphibole.
Optionally, the Mg isotope comprises δ 25 Mg and delta 26 Mg。
In the technical scheme of the invention, wet plasma conditions are formed when the Mg isotope composition is measured by laser ablation-multiple-receiving inductively coupled plasma mass spectrometry by adding water aerosol particles. Use of wet plasma eliminates the need for laser ablation-multiple receive inductively coupled plasma mass spectrometry for Mg isotope composition 12 C 14 N + And 48 Ca 2+ and provides for measurements with low mass resolutionThe conditions avoid the influence of the use of high-quality resolution on the signal intensity, the measurement precision and the accuracy; in addition, the use of the wet plasma also eliminates the matrix effect during the analysis of Mg isotopes among different lithologic samples, and provides conditions for realizing the non-matrix matching correction of Mg isotope composition among silicate samples (basalt, andesite, cormatite and quartz amphibole), thereby solving the problem of extremely deficient matrix matching standard substances; the use of wet plasma can also improve the signal-to-noise ratio of the laser ablation-multiple reception inductively coupled plasma mass spectrometry for determining the Mg isotope composition. Wherein, the background signal intensity of three isotopes of Mg is reduced by 51.9-59.5%, while the signal intensity of a standard sample/sample is only reduced by 7.0-8.5%, namely the signal-to-noise ratio is improved by 1-1.3 times, and the improvement of the signal-to-noise ratio can greatly improve the spatial resolution of the Mg isotope composition analyzed by laser ablation-multiple reception inductively coupled plasma mass spectrometry; the method is suitable for a femtosecond laser ablation system, is simple and effective, and can be widely popularized in other laboratories quickly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a laser in-situ micro-area Mg isotope measurement method according to the present invention;
FIG. 2 is a schematic view of an apparatus used in the laser in-situ micro-area Mg isotope measurement method provided by the present invention;
FIG. 3 is a diagram showing the composition of an Mg isotope measured in example 1 according to the present invention;
FIG. 4 shows the results obtained in example 2 of the present invention 12 C 14 N + A spectrum peak situation graph of interference;
FIG. 5 shows the results obtained in example 3 of the present invention 48 Ca 2+ Interference-induced non-mass fractionation profiles of Mg isotopes.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments.
It should be noted that those whose specific conditions are not specified in the examples were performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B", including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
With the development of instrument technology science, the laser ablation-multiple-receiving inductively coupled plasma mass spectrometry gradually becomes a 'potential strand' in the in-situ micro-area isotope determination technology by virtue of the advantages of weak matrix effect, low price, wide application and the like. However, the laser analysis process lacks a pretreatment separation and purification process, and the lack of the pretreatment separation and purification process causes the matrix elements to have important influence on the determination of the laser in-situ micro-area Mg isotope. Wherein the presence and complexity of the matrix element is such that it determines the accuracy (delta) of the Mg isotope 26 Mg:0.1-0.2 permillage) far lower than the determination precision (delta) of the solution 26 Mg:0.02-0.06 permillage). The existence of matrix elements mainly causes two problems of mass spectrum interference and matrix effect, so that how to simultaneously reduce the mass spectrum interference and the matrix effect is a key problem when the Mg isotope is measured in a laser in-situ micro-area.
In view of the above, the present invention provides a laser in-situ micro-area Mg isotope measurement method, please refer to fig. 1 to 5, where fig. 1 is a schematic flow chart of an embodiment of the laser in-situ micro-area Mg isotope measurement method provided by the present invention; FIG. 2 is a schematic view of an apparatus used in the laser in-situ micro-area Mg isotope measurement method provided by the present invention; FIG. 3 is a diagram showing the composition of an Mg isotope measured in example 1 according to the present invention; FIG. 4 shows the results obtained in example 2 of the present invention 12 C 14 N + A spectrum peak situation graph of interference; FIG. 5 shows the results obtained in example 3 of the present invention 48 Ca 2+ Interference-induced non-mass fractionation profiles of Mg isotopes.
As shown in fig. 1, the laser in-situ micro-area Mg isotope determination method includes the following steps:
and S10, performing laser ablation on the standard sample and the sample to obtain standard sample aerosol particles and sample aerosol particles.
The standard sample or the sample is ablated into aerosol particles which can be detected by multi-receiving inductively coupled plasma mass spectrometry through laser.
The laser ablation is carried out by adopting a femtosecond laser ablation system, the femtosecond laser ablation system can ablate a standard sample or a sample, and compared with the common nanometer laser ablation, the femtosecond laser ablation has the advantages of low heat effect and high peak power, so that the femtosecond laser ablation system is adopted for carrying out laser ablation, the matrix effect is favorably reduced, and conditions are provided for non-matrix matching correction during Mg isotope measurement. Preferably, the femtosecond laser ablation system is a 257nm 300fs yb.
In addition, the laser ablation pool of the femtosecond laser ablation system is a double-volume ablation pool so as to reduce isotope fractionation caused by position effect.
The standard sample comprises BHVO-2G basalt glass, and the sample comprises one of basalt, andesite, cormatite and quartz amphibole. After mass spectrum data of the sample is obtained, external standard correction is carried out on the sample through the mass spectrum data of the BHVO-2G basalt glass, and the Mg isotope composition condition with high accuracy and high precision is obtained. When the sample is basalt, BHVO-2G basalt glass is matched with the sample matrix, and when the sample is one of andesite, cormatite or quartz amphibole, BHVO-2G basalt glass is matched with the sample non-matrix.
For the problem of matrix effect in the laser in-situ micro-area determination of Mg isotope composition, the Mg isotope composition is usually corrected by adopting a matrix-matched standard substance. However, the extreme scarcity of matrix-matched standards severely limits the determination of Mg isotopic composition by laser ablation-multiple-receiver inductively coupled plasma mass spectrometry. And the Mg isotope composition correction of the BHVO-2G basalt glass and the sample is realized through non-matrix matching, and the problem of extremely lack of matrix matching standard substances is favorably solved.
Further, the basalt is one of BCR-2G basalt, BIR-1G basalt, KL2-G basalt and ML3B-G basalt, the andesite is StHs6/80-G andesite, the komattes are one of GOR128-G komattes and GOR132-G komattes, and the quartz amphiboles are T1-G quartz amphiboles.
And S20, atomizing water to obtain water aerosol particles.
The invention is not limited to the particular means by which the water is atomized, and for example, atomization of the water may be achieved using a combination of a mist chamber and an atomizer. After the water aerosol particles are obtained, the water aerosol particles and solid aerosol particles (standard sample aerosol particles or sample aerosol particles) obtained by laser ablation enter an ion source of the multi-receiving inductively coupled plasma mass spectrometer, and the water aerosol particles and the solid aerosol particles are mixed to form wet plasma, so that the wet plasma is favorable for reducing mass spectrum interference and matrix effect during mass spectrum detection.
Furthermore, the water is ultrapure water, and water sol particles are obtained by atomizing the ultrapure water, so that the precision and accuracy of the Mg isotope composition obtained by multi-receiving inductively coupled plasma mass spectrometry are improved.
And S30, mixing the standard sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry to obtain standard sample mass spectrometry data.
The multi-receive inductively coupled plasma mass spectrometry detection employs low mass resolution. The multi-receiving inductively coupled plasma mass spectrometer comprises a sample introduction system, a plasma source, an interface, an ion lens system, a mass analyzer and a multi-receiving detector. After the working parameters of the multi-receiving inductively coupled plasma mass spectrometer are optimized and adjusted, the standard sample aerosol particles and the water aerosol particles enter a plasma source through a sample introduction system, the standard sample aerosol particles and the water aerosol particles are atomized and ionized in an ion source to form Mg ions, the Mg ions enter an ion lens system through a sampling cone and an intercepting cone, and the Mg ions are focused into ion beams under the action of an electric field of a series of lenses and are transmitted to a mass analyzer. In the mass analyzer, mg ions are first subjected to energy focusing by an electrostatic analyzer, and then mass focusing by a magnetic field analyzer, and finally the ion beam is separated according to the difference of mass-to-charge ratios. Finally, the separated ions simultaneously enter a detector to generate a current signal, and the current signal is amplified and detected by an amplifier. In order to reduce the mass spectrum interference of laser in-situ micro-area Mg isotope composition determination, a common method is to adopt medium/high mass resolution, however, the signal intensity of an instrument is reduced by 3-10 times by using higher mass resolution, and the influence of matrix effect on the accuracy and precision of the measured isotope is aggravated. The invention adopts low mass resolution, and reduces the influence of matrix effect on the precision and accuracy of Mg isotope composition determination on the premise of improving the signal intensity of the instrument. It should be noted that, as shown in fig. 2, the MC-ICP-MS is a multi-receiving inductively coupled plasma mass spectrometer, and the specific process of the standard sample aerosol particles and the water aerosol particles entering the sample injection system of the MC-ICP-MS together is as follows: he gas (helium) is used as a purge gas to introduce the standard/sample aerosol particles into the sample introduction system together with the water aerosol particles formed by Ar gas (argon).
And S40, mixing the sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry to obtain sample mass spectrometry data.
Step S40 corresponds to step S30 except that the standard sample aerosol particles in step S30 are replaced with sample aerosol particles, and thus step S40 has all the technical effects produced in step S30.
And S50, correcting the sample mass spectrum data by utilizing the external standard of the standard sample mass spectrum data to obtain the Mg isotope composition of the sample.
The external standard correction belongs to a commonly used technical means in the field, a specific process of the external standard correction is not described in detail, and the sample mass spectrum data is corrected through the external standard of the standard sample mass spectrum data to obtain a Mg isotope composition determination result with high accuracy and precision.
Further, the Mg isotope includes δ 25 Mg and delta 26 Mg。
According to the technical scheme, wet plasma conditions are formed when the Mg isotope composition is measured by laser ablation-multi-receiving inductively coupled plasma mass spectrometry through adding water aerosol particles. Use of wet plasma eliminates the need for laser ablation-multiple receive inductively coupled plasma mass spectrometry for Mg isotope composition 12 C 14 N + And 48 Ca 2+ the interference of (2) and providing conditions for the determination by adopting low-quality resolution, thereby avoiding the influence of the use of high-quality resolution on signal strength, determination precision and accuracy; in addition, the use of the wet plasma also eliminates the matrix effect during Mg isotope analysis among different lithologic samples, and provides conditions for realizing non-matrix matching correction of Mg isotope composition among silicate samples (basalt, andesite, cormatite and quartz amphibole), thereby solving the problem of extremely deficient matrix matching standard substances; the use of wet plasma can also improve the signal-to-noise ratio of the laser ablation-multiple reception inductively coupled plasma mass spectrometry for determining the Mg isotope composition. Wherein, the background signal intensity of three isotopes of Mg is reduced by 51.9-59.5%, while the signal intensity of the standard sample/sample is only reduced by 7.0-8.5%, i.e. the signal-to-noise ratio is improved by 1-1.3 times, and the improvement of the signal-to-noise ratio can greatly improve the laser ablation-multi-receiver inductively coupled plasma mass spectrometry for spatial resolution of Mg isotope composition; the method is suitable for a femtosecond laser ablation system, is simple and effective, and can be widely popularized in other laboratories quickly.
The technical solution of the present invention is further described in detail below with reference to specific embodiments and accompanying drawings, where it is to be noted that the low or medium mass resolution below refers to the mass resolution of the multi-receive inductively coupled plasma mass spectrometry; the wet plasma refers to water aerosol particles obtained by introducing ultrapure water atomization during multi-receiving inductively coupled plasma mass spectrometry, and the dry plasma refers to water aerosol particles not introduced during multi-receiving inductively coupled plasma mass spectrometry.
Example 1
(1) Performing laser ablation (257nm 300fs Yb femtosecond laser ablation system, double-body product ablation pool) on a standard sample (BHVO-2G basalt glass) and a sample (BCR-2G basalt, BIR-1G basalt, KL2-G basalt, ML3B-G basalt, stHs6/80-G andesite, GOR128-G Komari, GOR132-G Komari and T1-G quartz amphibole respectively) to obtain standard sample aerosol particles and sample aerosol particles.
(2) And atomizing the ultrapure water to obtain water aerosol particles.
(3) And mixing the standard sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry (low mass resolution) to obtain standard sample mass spectrometry data.
(4) And mixing the sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry (low mass resolution) to obtain sample mass spectrometry data.
(5) Correcting the sample mass spectrum data by using the external standard of the standard sample mass spectrum data to obtain the Mg isotope (delta) of the sample 25 Mg and delta 26 Mg) is added.
BHVO-2G basalt glass is used as external standard for correcting basalt (BCR-2G, BIR-1G, KL-G and ML 3B-G) and andesite (StHs 6/8)The results are shown in FIG. 3 for Mg isotopic compositions of 0-G), colomasiate (GOR 128-G and GOR 132-G) and Quartz spanishes (T1-G). The measurement results show that 25 Mg and delta 26 The laser measurement of Mg and the solution recommended value were consistent within the error range (the measurement results are shown in table 1 below), i.e., both fell on the straight line of measurement/recommended value = 1:1. Further, δ 25 Mg and delta 26 The measured value of Mg falls on the straight line with measured/recommended =0.510, indicating that the isotopic composition of Mg obtained by this method is not affected by non-mass discrimination and mass spectrum interference. The experimental results demonstrate that non-matrix matching corrections of Mg isotope compositions can be achieved with low resolution under conditions employing wet plasma.
TABLE 1. Delta 25 Mg and delta 26 Laser measured value and solution recommended value condition of Mg
Example 2
Under the condition of medium mass resolution, when dry/wet plasmas are respectively adopted 12 C 14 N + Spectral peak cases of interference.
In order to explore laser ablation-multi-receiving inductively coupled plasma mass spectrometry under dry/wet plasma conditions 12 C 14 N pairs 26 The Mg interference is measured by scanning from 24.96 to 25.03 mass with medium mass resolution under the condition that the laser does not work, and the measured result is shown in figure 4.
As can be seen from the graph of FIG. 4 (a), under the dry plasma condition, two flat-top peaks are clearly seen at the position of mass number 26, and the left and right peaks are respectively 26 Mg and 12 C 14 N + a peak of (a); as can be seen from the graph of fig. 4 (b), under the wet plasma condition, the flat top peak on the right side of the position of the mass number 26 disappears, that is, under the wet plasma condition, 12 C 14 N + the interference of (2) is greatly reduced.
Example 3
Under low mass resolution conditions, when using dry/wet plasma 48 Ca 2+ Interference caused non-mass fractionation of Mg isotopes.
To explore under dry/wet plasma conditions 48 Ca 2+ To pair 24 Mg + Respectively under dry/wet plasma conditions on USGS and MPI-DING glasses (basalt: BCR-2G, BIR-1G, KL-G and ML3B-G; stHs6/80-G, GOR128-G and GOR-132, and Quartz amphiboles T1-G) Mg isotope composition, and using the same 26 Mg and (a) 48 Ca/ 24 Mg) BHVO-2G Representation of the relationship between 48 Ca 2+ The resulting interference situation is shown in fig. 5. Delta 26 Mg(Δ 26 Mg(‰)＝δ 26 Mg-δ 25 Mg/0.510) refers to the non-mass discrimination of Mg isotopes. ( 48 Ca/ 24 Mg) BHVO-2G Referred to the sample to be tested 48 Ca/ 24 Of Mg with the sample BHVO-2G 48 Ca/ 24 The ratio of Mg. The closer the ratio is to 1, the more the sample is compared with the standard 48 Ca/ 24 The closer the Mg ratio, the closer the Mg ratio means that the Mg ratio is obtained by using BHVO-2G as external standard correction 48 Ca 2+ The less interference is caused.
As can be seen from FIG. 5, under the condition of dry plasma, the Δ of 8 glass standards to be measured 26 Mg value and ( 48 Ca/ 24 Mg) BHVO-2G There is a very good linear relationship and only if ( 48 Ca/ 24 Mg) BHVO-2G Δ obtained when the ratio is in the range of 0.88-1 26 The Mg value (-0.02-0.01 ‰) is within the range of 0 + -0.1 ‰. When (a) and (b) 48 Ca/ 24 Mg) BHVO-2G Δ at a ratio of 1.68 26 Mg has a measured value of about 0.26 + -0.08 ‰, when (C:) 48 Ca/ 24 Mg) BHVO-2G Δ when the ratio is 0.15 26 Measured value of Mg is about-0.39. + -. 0.11 ‰, and obtained as Delta 26 The measured values of Mg are far from the range of 0 +/-0.1 per thousand, namely 48 Ca 2+ To pair 24 Mg + The interference of (b) causes non-mass fractionation of the Mg isotope. However, in the process of usingIn the case of wet plasma, i.e. < i >, < i > 48 Ca/ 24 Mg) BHVO-2G In the range of 0.2 to 1.8, delta 26 The measured values of Mg are all within 0 +/-0.1 per thousand, namely the experimental result shows that the Mg is in the condition of wet plasma 48 Ca 2+ To pair 24 Mg + The interference of (a) is negligible.
Example 4
When medium mass resolution is used, under dry/wet plasma conditions respectively 24 Mg、 25 Mg and 26 the results of the background signal intensity of Mg and the signal intensity of the sample are shown in Table 2 below.
TABLE 2 24 Mg、 25 Mg and 26 background signal, sample signal intensity and signal-to-noise ratio of Mg
As can be seen from table 2, when dry plasma is used, 24 Mg、 25 mg and 26 the background signal intensity of Mg was 8.29mV, 1.16mV and 1.35mV, respectively. Under the condition that the wet plasma is adopted, 24 Mg、 25 mg and 26 the background signal intensity of Mg was reduced to 3.82mV, 0.47mV and 0.65mV, respectively. Therefore, when a wet plasma is used, 24 Mg、 25 mg and 26 the background signal intensity of Mg decreased by about 51.9-59.5%. Whereas, under the same laser ablation conditions, the signal intensity of BHVO-2G under wet plasma conditions was only reduced by 7.0-8.5% relative to that of dry plasma conditions. Thus, with wet plasma, the signal-to-noise ratio can be increased from 1300 to 3100, up to a factor of 1.3.
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (8)
1. A laser in-situ micro-area Mg isotope determination method is characterized by comprising the following steps:
carrying out laser ablation on the standard sample and the sample to obtain standard sample aerosol particles and sample aerosol particles;
atomizing water to obtain water aerosol particles, wherein the atomization is realized by combining a fog chamber and an atomizer;
mixing the standard sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry to obtain standard sample mass spectrometry data;
mixing the sample aerosol particles and the water aerosol particles, and performing multi-receiving inductively coupled plasma mass spectrometry to obtain sample mass spectrometry data;
correcting the sample mass spectrum data by using the external standard of the standard sample mass spectrum data to obtain the Mg isotope composition of the sample;
wherein the standard sample comprises BHVO-2G basalt glass;
the multi-receive inductively coupled plasma mass spectrometry detection employs low mass resolution.
2. The laser in-situ micro-area Mg isotope measurement method of claim 1, wherein said water is ultrapure water.
3. The laser in-situ micro-area Mg isotope determination method of claim 1, wherein said laser ablation is performed using a femtosecond laser ablation system.
4. The laser in-situ micro-area Mg isotope assay method of claim 3, wherein said femtosecond laser ablation system is a 257nm 300fs Yb.
5. The laser in-situ micro-area Mg isotope measurement method according to claim 3 or 4, wherein the laser ablation tank of said femtosecond laser ablation system is a double volume ablation tank.
6. The laser in-situ micro-area Mg isotope measurement method of claim 1, wherein said sample comprises one of basalt, andesite, cormatite and quartzite.
7. The laser in-situ micro-area Mg isotope determination method of claim 6, wherein said basalt is one of BCR-2G basalt, BIR-1G basalt, KL2-G basalt and ML3B-G basalt, said andesite is StHs6/80-G andesite, said cormatite is one of GOR128-G cormatite and GOR132-G cormatite, and said quartz amphibole is T1-G quartz amphibole.
8. The laser in-situ micro-area Mg isotope measurement method of claim 1, wherein said Mg isotope comprises δ 25 Mg and delta 26 Mg。
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