CN113884641A - Method for measuring pH value of salt lake ancient brine - Google Patents
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- 239000012267 brine Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 53
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 52
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 75
- 229910052796 boron Inorganic materials 0.000 claims abstract description 75
- 238000011160 research Methods 0.000 claims abstract description 24
- 239000013049 sediment Substances 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 150000003839 salts Chemical group 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 4
- 235000002639 sodium chloride Nutrition 0.000 abstract description 47
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 4
- 239000011780 sodium chloride Substances 0.000 abstract description 4
- 230000008021 deposition Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 239000011435 rock Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000003969 polarography Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/15—Correlation function computation including computation of convolution operations
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Abstract
The invention discloses a method for measuring the pH value of salt lake ancient brine. The method comprises the following steps: taking a salt lake of a chaihu basin as a research area; selecting sediments at different depths in the research area, and testing the boron concentration and the boron isotope value of the sediments; and establishing a functional relation among the boron concentration, the boron isotope value and the pH value of the salt lake ancient brine, so that the pH value of the salt lake ancient brine in the Cheddar basin can be determined by testing the boron content and the boron isotope value. The invention provides a method for measuring the pH value of salt lake ancient brine by establishing a functional relation between the boron content and the boron isotope value which are easy to measure in rock salt and the pH value of the salt lake ancient brine according to the correlation of the boron content and the boron isotope value, aiming at the salt lake in the chaihu basin, wherein the method is simple to operate and easy to realize.
Description
Technical Field
The invention belongs to the technical field of exploration and test, relates to a method for measuring the pH value of salt lake ancient brine, and particularly relates to a method for measuring the pH value of salt lake ancient brine by using the boron content and the boron isotope value in salt lake rock salt.
Background
The pH value of the ancient brine can restore the ancient environment, and the regional climate change can be identified from the regional brine pH value change history, so that an effective index is provided for the reconstruction of the ancient climate. In inland arid and semiarid regions, the salinity of lakes, particularly closed lakes, depends on the balance relation and the change process of river basin rainfall, runoff and evaporation capacity. The quantitative reconstruction of the pH value of the ancient brine can promote the past global change research to move from qualitative to quantitative. The research method of the pH value of the ancient brine is mainly used at present: qualitatively describing the pH value of the water body by using ancient biology, rock and ore and ancient geographic data; the pH value of the water body is qualitatively divided by applying a geochemical method of macroelement isotopes and trace elements; directly measuring the pH value by using pore fluid or liquid phase inclusion; the pH value and the like are qualitatively estimated by the inverse correlation between the lake water salinity and the lake surface changes using sedimentary phosphates and clay minerals.
At present, the research on environment evolution by using lake deposition is an active field, and the lake deposition has the characteristics of continuous deposition, high deposition rate, high resolution, rich information content and wide geographical coverage. The research of rebuilding the ancient climate and the ancient environment evolution of different time scales by using the lake deposition record is more and more emphasized, and the pH value information of the ancient brine contains a large amount of ancient brine formation information, so that the research of the pH value of the ancient brine has important significance for researching the ancient climate change.
The research method of the pH value of the ancient brine is mainly used at present: qualitatively describing the pH value of the water body by using ancient biology, rock and ore and ancient geographic data; the pH value of the water body is qualitatively divided by applying a geochemical method of macroelement isotopes and trace elements; directly measuring the pH value by using pore fluid or liquid phase inclusion; the pH value and the like are qualitatively estimated by the inverse correlation between the lake water salinity and the lake surface changes using sedimentary phosphates and clay minerals.
Most of the methods for measuring the pH value of the ancient brine are qualitative estimation, and the quantitative method only adopts a fluid inclusion to directly measure the pH value of the ancient brine, but the method for measuring the pH value of the ancient brine by the fluid inclusion has the defects of large measurement difficulty, large measurement result error and the like due to the limitations of sample treatment, a measuring instrument, a measuring method and the like.
Boron has high geochemical activity, and the difference between the two isotopes is large, thereby causing the boron isotopes in nature to generate fractionation. Currently, boron isotope values of evaporite and brine are often used to trace ancient salt sources or to reconstruct deposition environments of marine and non-marine phases. Similarly, geochemical processes of brine, groundwater, hot spring water and salt deposition can be evaluated by the ratio of boron isotope composition and elemental content. Researches on geochemistry of boron isotopes in salt lakes in arid regions and the geological significance of boron isotopes reflected in salt minerals are rare. By researching the brine evaporation test of 7 salt lakes in the chadda basin and the boron isotope value of salt rocks and brine coexisting in the salt rocks, the predecessor thinks that the boron isotope value of the salt rocks can record the evolution process of the salt lake brine. The research provides a good idea for reconstructing the evolution process of the ancient brine through the boron isotope value of the salt rock.
The determination of the boron content and the determination of the boron isotope are relatively mature and reliable test methods. The analysis method of trace boron mainly comprises a spectrophotometry method, a single-scan indication wave polarography method, an ion selective electrode method, a spectrometry method and the like, and each method has a certain application range and objects. Boron is a volatile element and is extremely volatile in the chemical treatment decomposition sample, causing loss. In addition, the method is easily polluted by boron-containing glassware and reagents in the analysis process, so that a large blank is caused, and the detection limit is influenced.
Most of the methods for measuring the pH value of the ancient brine are qualitative estimation, and the quantitative method only adopts a fluid inclusion to directly measure the pH value of the ancient brine, but the method for measuring the pH value of the ancient brine by the fluid inclusion has the defects of large measurement difficulty, large measurement result error and the like due to the limitations of sample treatment, a measuring instrument, a measuring method and the like. How to provide a simple and accurate method for testing the pH value of the ancient brine in the salt lake is an urgent problem to be solved.
Disclosure of Invention
The invention mainly aims to provide a method for measuring the pH value of salt lake ancient brine, so as to overcome the defects of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:
the embodiment of the invention provides a method for measuring the pH value of salt lake ancient brine, which comprises the following steps:
taking a salt lake of a chaihu basin as a research area;
selecting sediments at different depths in the research area, and testing the boron concentration and the boron isotope value of the sediments;
and establishing a functional relation among the boron concentration, the boron isotope value and the pH value of the salt lake ancient brine, so that the pH value of the salt lake ancient brine in the Cheddar basin can be determined by testing the boron content and the boron isotope value.
Further, the method comprises: and selecting a plurality of sediments in salt cores with different depths in the research area as samples in a drilling mode.
Further, the method comprises: and selecting sediment in any depth area of 0-44 m in the research area as a sample, and testing the boron concentration and the boron isotope value of the sediment.
Further, the method comprises: the pH value of the ancient brine of the salt lake corresponding to the sediment is obtained according to geological literature data.
Further, the method comprises: the functional relation among the boron concentration, the boron isotope value and the pH value of the salt lake ancient brine is as follows: pH ═ lg (0.012 TDS-delta)11B +35.39) +5, where TDS is the boron concentration, delta11B is the boron isotope value.
The embodiment of the invention also provides application of the method in determination of the pH value of the ancient brine of the salt lake in the Lauda basin.
Compared with the prior art, the invention has the beneficial effects that: most of the conventional methods for measuring the pH value of the ancient brine are qualitative estimation, and the method is simple to operate and easy to implement.
Detailed Description
In view of the defects of the prior art, the inventor of the present invention has made extensive studies and practices to provide the technical scheme of the present invention, which mainly utilizes the characteristic that the boron content and the boron isotope value in rock salt have good correlation with the pH value of the paleo-brine, and determines the pH value of the paleo-brine through the boron content and the boron isotope value in the rock salt.
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments 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.
The method for measuring the pH value of the ancient brine in the salt lake comprises the following steps:
taking a salt lake of a chaihu basin as a research area;
selecting sediments at different depths in the research area, and testing the boron concentration and the boron isotope value of the sediments;
and establishing a functional relation among the boron concentration, the boron isotope value and the pH value of the salt lake ancient brine, so that the pH value of the salt lake ancient brine in the Cheddar basin can be determined by testing the boron content and the boron isotope value.
In some more specific embodiments, the method comprises: and selecting a plurality of sediments in salt cores with different depths in the research area as samples in a drilling mode.
In some more specific embodiments, the method comprises: and selecting sediment in any depth area of 0-44 m in the research area as a sample, and testing the boron concentration and the boron isotope value of the sediment.
Furthermore, the number of the samples is 5-15.
In some more specific embodiments, the method comprises: the pH value of the ancient brine of the salt lake corresponding to the sediment is obtained according to geological literature data.
In some more specific embodiments, the method comprises: the functional relation among the boron concentration, the boron isotope value and the pH value of the salt lake ancient brine is as follows: pH ═ lg (0.012 TDS-delta)11B +35.39) +5, where TDS is the boron concentration, delta11B is the boron isotope value.
Furthermore, the TDS range in the functional relation is 300-400 mg/L.
Further, δ in the functional relation11The range of B is 7-15 per mill.
In some more specific embodiments, the sample has a mass of 20 to 50 g.
In another aspect of the embodiment of the invention, the application of the method in determination of the pH value of the ancient brine of the salt lake in the basin of the faaida is further provided.
The technical solution of the present invention is further described in detail with reference to several preferred embodiments, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments.
The experimental materials used in the examples used below were all available from conventional biochemical reagents companies, unless otherwise specified.
Example 1
(1) Taking a salt lake of a chaihu basin as a research area;
(2) 8 sediments in salt cores with different depths of 0-44 m in the salt lake region of the Chauda basin are selected as samples in a drilling mode, and the sediments are tested for boron concentration and boron isotope value.
(3) Performing inverse calculation on the boron concentration data obtained by actual measurement by using a quantitative relation obtained by researching the salt lake in the basin of the firewood by predecessors to obtain the pH values of the ancient brine of 8 sediment samples, wherein the pH values are shown in table 1;
table 18 boron concentration, boron isotope value and paleo-brine pH value in sediment samples
| Name (R) | TDS(g/L) | δ11B(‰) | pH |
| Sample 1 | 308.3 | 11.00 | 6.38 |
| Sample 2 | 338.6 | 9.90 | 6.42 |
| Sample 3 | 314.6 | 9.67 | 6.39 |
| Sample No. 4 | 346.9 | 10.04 | 6.40 |
| Sample No. 5 | 325.8 | 10.18 | 6.22 |
| Sample No. 6 | 329.9 | 13.08 | 6.33 |
| Sample 7 | 309.9 | 9.56 | 6.23 |
| Sample 8 | 311.8 | 11.39 | 6.19 |
(4) Establishing a functional relation among the boron concentration, the boron isotope value and the pH value of the salt lake ancient brine: pH ═ lg (0.012 TDS-delta)11B+35.39)+5。
In addition, the boron concentration and the boron isotope value in salt cores of different depths of any salt lake region of the Chadamu basin are tested, and then according to the functional relation: pH 1g (0.012 TDS-delta)11B +35.39) +5, and the calculated pH value of the ancient brine conforms to the previous research on the salt lake of the Chadamu basin.
In addition, the inventors of the present invention have also made experiments under other conditions described in the present specification with reference to the above examples, and have obtained preferable results.
It should be understood that the technical solution of the present invention is not limited to the above-mentioned specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention without departing from the spirit of the present invention and the protection scope of the claims.
Claims (9)
1. A method for measuring the pH value of ancient brine in a salt lake is characterized by comprising the following steps:
taking a salt lake of a chaihu basin as a research area;
selecting sediments at different depths in the research area, and testing the boron concentration and the boron isotope value of the sediments;
and establishing a functional relation among the boron concentration, the boron isotope value and the pH value of the salt lake ancient brine, so that the pH value of the salt lake ancient brine in the Cheddar basin can be determined by testing the boron content and the boron isotope value.
2. The method of claim 1, comprising: and selecting a plurality of sediments in salt cores with different depths in the research area as samples in a drilling mode.
3. The method of claim 1, comprising: and selecting sediment in any depth area of 0-44 m in the research area as a sample, and testing the boron concentration and the boron isotope value of the sediment.
4. The method of claim 1, wherein: the pH value of the ancient brine of the salt lake corresponding to the sediment is obtained according to geological literature data.
5. The method of claim 1, wherein: the functional relation among the boron concentration, the boron isotope value and the pH value of the salt lake ancient brine is as follows: pH ═ lg (0.012 TDS-delta)11B +35.39) +5, where TDS is the boron concentration, delta11B is the boron isotope value.
6. The method of claim 5, wherein: the TDS range in the functional relation is 300-400 mg/L.
7. The method of claim 5, wherein: delta in the functional relation11The range of B is 7-15 per mill.
8. A method according to claim 2 or 3, characterized in that: the number of the samples is 5-15.
9. The method of claim 1, wherein: the mass of the sample is 20-50 g.
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