CN102621592A - Efficiency-adjustable dynamic geogas prospecting method - Google Patents
Efficiency-adjustable dynamic geogas prospecting method Download PDFInfo
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Abstract
The invention relates to an efficiency-adjustable dynamic geogas prospecting method comprising the following steps: 1, preparing a dynamic geogas sampling device which comprises a sampler, a drier, at least one trap an air pump; and 2, prospecting geogas: firstly, distributing an outdoor geogas prospecting profile according to a mine or construction prospecting target, secondly, drilling a gas production drill hole on a surface cover layer and inserting the sampler into the drill hole, thirdly, filling a liquid trapping agent into the trap, connecting the dynamic geogas sampling device and extracting a geogas material, fourthly, drying the geogas material and capturing the geogas material by the liquid trapping agent in the trap, fifthly, concentrating the sampled liquid trapping agent, sixthly, performing multielement analysis on the concentrated trapping agent sample to obtain the concentration information of elements such as Zn, Pb, Cu, rare earths, etc., and drawing a multielement profile map, a plane contour diagram and/or a rare earth element distribution mode diagram as the evidences for the result analysis. According to the efficiency-adjustable dynamic geogas prospecting method, the sampling efficiency and the working efficiency of geogas prospecting can be improved simultaneously, and more composition information about the geogas material can be acquired.
Description
Technical field:
The invention belongs to the geophysical exploration field, relate to the ground vapour material that a kind of quick collection crust deep part moves to the face of land and explore latent metallic ore and the latent adjustable dynamic ground vapour measuring method of architectonic efficient.
Background technology:
The ground vapour measurement is a kind ofly to look for the new method of deep concealed ore deposit and buried structure through collecting and analyze deep material that underground updraft carries.At present, the ground vapour measuring method is divided into that the accumulation formula is measured and two kinds of kinetic measurements.The former is at underground embedding solid catcher (like macromolecular material, the molybdenum net of having carbon film, polyester film etc.); The long-time ground vapour material of collecting; Then with the elemental composition of methods analyst ground vapour materials such as neutron activation, or utilize characteristics such as tem study ground vapour mineral particles composition, granularity, shape
[1～4]The latter be utilize air pump on the face of land overlayer bleed, collect the ground vapour material with liquid state or solid capture agent, carry out the elemental composition analysis with chemical analysis method
[5]Form and space distribution rule according to the ground vapour material element of collecting, can judge the characteristic and the position of concealed orebody or buried structure, be used for geophysical exploration.
The measurement of accumulation formula ground vapour needs the long sampling time (generally needing tens of days), and the work period is long, and efficient is not high.And to require the ground vapour drip catcher be solid-state, if utilize the chemical analysis technology of liquid sample introduction to come it is carried out the elemental composition analysis, must carry out chemical treatment to drip catcher, operates more loaded down with trivial details.Dynamically ground vapour is measured through in overlayer, bleeding and is collected the ground vapour material fast, and the work period is short, but sampling efficiency is limited, and the ground vapour material of collecting is few, is difficult to accurately analyze the concentration of most elements.Still do not have systematic study to improve dynamic ground vapour sampling efficiency both at home and abroad, be suitable for the achievement of express-analysis means.Therefore, develop the short dynamic ground vapour measuring method that can take into account sampling efficiency again of a kind of work period, with the quantity of information of the work efficiency that improves the ground vapour measurement, expansion measurement achievement, the application that ground vapour is measured has important practical usage.
Summary of the invention:
The objective of the invention is in order to overcome above deficiency, provide a kind of and can improve sampling efficiency and the work efficiency that ground vapour is measured simultaneously, obtain the adjustable dynamic ground vapour measuring method of efficient of more ground vapour material composition information.
The objective of the invention is to realize like this:
The dynamic ground vapour measuring method that efficient of the present invention is adjustable, this method may further comprise the steps:
1); Prepare the adjustable dynamic ground vapour sampling apparatus of sampling efficiency: dynamically the ground vapour sampling apparatus comprises sampling thief, exsiccator, at least one drip catcher and aspiration pump; Having in the sampling thief has taper bit on the end termination that air intake opening is arranged on the sampling pipe that contains air intake opening and gas outlet, the sampling pipe and the other end and gas outlet adjacent have inverted cone; Exsiccator is glass tubular, interior dress silica-gel desiccant and two ends dress filtering material; Play the effect of drying, filtration; The air intake opening of exsiccator is connected with gas outlet on the sampling pipe through first silica gel catheter, glass container is arranged in the drip catcher, be fixed on and on capture conduit one end on the glass container import arranged and have the other end of outlet to stretch in the glass container, and outlet is arranged on the glass container; One end of second silica gel catheter is connected with the gas outlet of exsiccator and the other end is connected with the capture duct inlet, and aspiration pump is connected with the outlet of drip catcher through the 3rd silica gel catheter;
2), ground vapour is measured:
1. according to looking for the ore deposit or looking for the structure target, arrange open-air ground vapour measurement section;
2. during field sampling, overlayer is played gas production boring on the face of land earlier, and dark 50～80cm inserts boring with sampling thief then, makes on the sampling thief inverted cone block the aperture, gets into gas production boring to stop face of land atmosphere;
3. the liquid trapping agent of in drip catcher, packing into; Connect dynamic ground vapour sampling apparatus; Open aspiration pump, make rate of air sucked in required maintain 1.5～3L/min, extract and be free on the ground vapour material in the overlayer space; Liquid trapping agent is to be rare nitric acid of 5% by the concentration expressed in percentage by weight that pure nitric acid of BV-III and ultrapure water dispose; Liquid trapping agent consumption is 15～25ml in each drip catcher, and ultrapure water is that the conducting medium in the water is almost completely removed, again the colloidal material that does not dissociate in the water, gas and organism all is removed to the very water of low degree, and resistivity is greater than 180M Ω .cm;
4. make the ground vapour material dry through exsiccator, get into drip catcher again and captured by liquid trapping agent, the sampling time is 20～60min;
5. concentrate the liquid trapping agent after sampling: the liquid trapping agent after will sampling is earlier poured in the clean polytetrafluoroethylene beaker; Place and be heated to 120 ℃ on the electric hot plate at least; Keep 3-5h; Do near evaporation until sample, splash into the concentration expressed in percentage by weight that disposes by pure nitric acid of BV-III and ultrapure water again and be rare nitric acid of 5%, be settled to 5ml; Adopt the drip catcher of a plurality of series connection, concentrate again after will the liquid trapping agent in a plurality of drip catchers being mixed earlier, improve the analysis precision and the detection sensitivity of all elements in the ground vapour;
6. the trapping agent sample after concentrating carries out multielement analysis with icp ms (ICP-MS), obtains the concentration information of Zn, Pb, Cu, Ni, U, Th, Cs, Co, Sc, Cr, Mn, Sr, Rb, Au, W, Mo, Bi, REE in the ground vapour; According to the concentration of multielement in the different mining sampling point ground vapour, draw multielement sectional view, plane equal-value map or REE allocation model figure, as the foundation that achievement is explained, latent metallic ore of exploration and latent tectonic structure.
Above-mentioned 2), 3. during step, rate of air sucked in required maintains 2L/min, liquid trapping agent consumption is 20ml in each drip catcher; 2) 4. during step, the sampling time is 30 min; 2) 5. during step, the liquid trapping agent after the sampling is heated to 120 ℃ on electric hot plate, keep 4h, and sampling work efficient is best, and accuracy of analysis is higher.
Drip catcher in the above-mentioned dynamic ground vapour sampling apparatus is two, adopts the silica gel catheter series connection, and as required, drip catcher also can adopt three or more a plurality of.
A certain amount of trapping agent of need packing into during drip catcher work is used for collecting the ground vapour material.Drip catcher can loading and unloading flexibly on package unit.During sampling, both can use single drip catcher, also can use a plurality of drip catcher series connection, and let the ground vapour material, can regulate sampling efficiency with this through repeatedly capturing.Aspiration pump is rechargeable, dispense with outer connecting power, and rate of air sucked in required 1～3L/min is adjustable.
Compare with ground vapour measuring method in the past, the present invention has following beneficial effect:
(1) sampling efficiency is adjustable, can improve sampling efficiency greatly: through adopting the mode of a plurality of drip catcher series connection, can regulate sampling efficiency---and the drip catcher of series connection is many more, and sampling efficiency is high more.Dynamic ground vapour experiments of measuring through carrying out in certain uranium exploration district shows; When using two drip catchers to connect; Make the ground vapour material pass through A, two drip catchers of B successively; The concentration of most elements is promptly passed through the capture of A bottle trapping agent near 2 times (concrete data are seen table 1) of B bottle in the A bottle trapping agent, and remaining ground vapour material also can continue to collect a part through B bottle trapping agent.The total amount of collected of ground vapour can reach 150% of single bottle of trapping agent, and promptly sampling efficiency has improved 50%.
Ground vapour material concentration in two parts of trapping agents that certain measuring point of table 1 is in series
(2) work period is short: owing to improved sampling efficiency greatly, the sampling time of each measuring point is controlled at 20～60min and can meets the demands, if there is the dynamic ground vapour sampling apparatus of 3 covers to be used alternatingly, can accomplish the sampling work of 30～40 measuring points every day.The analysis speed of ICP-MS is very fast, and is that multielement is analyzed simultaneously, and the Measuring Time of each sample is no more than 2min.If a preliminry basic research district need arrange about 200 measuring points, the field sampling time adds sample transportation, concentrates, analysis and achievement interpretation time, can accomplish a whole set of work in about 15 days.This sampling time than accumulation formula ground vapour measuring method is also short.
(3) can obtain more, ground vapour elemental composition information more accurately.The liquid trapping agent (ground vapour sample) of having caught the ground vapour material carries out the ICP-MS analysis again through concentrating, and can improve the analysis precision and the detection sensitivity of all elements in the ground vapour.Measured result in certain uranium exploration district shows (concrete data are seen table 2); Concentration of element after trapping agent concentrates is 5～10 times before concentrating; Be far longer than the analysis detection limit, the element (the low excessively element of concentration in the ground vapour) that can't accurately analyze before concentrating can obtain analysis result preferably through concentrating.Therefore, but analytical element before concentrate ten surplus kind be increased to 30 surplus kind, enlarged the quantity of information that ground vapour is measured.In addition, after trapping agent concentrated, the measuring error of various elements all had reduction in various degree, proves that analysis precision obviously improves.
Ground vapour material concentration and measuring relative errors before and after certain measuring point trapping agent of table 2 concentrates
| ? | Concentration before concentrating | Concentrate back concentration | RSD% before concentrating | Concentrate back RSD% |
| U (10 -12g/ml) | 7.9 | 73.7 | 40.4 | 5.5 |
| Th (10 -12g/ml) | 8.1 | 86.6 | 20.0 | 1.6 |
| Zn (10 -9g/ml) | 12.4 | 58.8 | 6.6 | 5.9 |
| Pb (10 -9g/ml) | 1.03 | 8.54 | 2.1 | 1.1 |
| La (10 -12g/ml) | 40.3 | 338.5 | 20.2 | 2.9 |
| Ce (10 -12g/ml) | 112.6 | 688.8 | 9.1 | 3.5 |
Description of drawings:
Fig. 1 is dynamic ground vapour sampling apparatus synoptic diagram.
Dynamic ground vapour sampling apparatus synoptic diagram when Fig. 2 is two drip catcher series connection.
Fig. 3 is that the dynamic ground vapour of No. 19 surveys line in long row uranium exploration district, Guangdong is measured result map.
Fig. 4 is that the dynamic ground vapour of No. 4 surveys line in long row uranium exploration district, Guangdong is measured result map.
Fig. 5 is Guangdong long row ground vapour U exceptions area and uranium ore rare earth elements pattern comparison diagram.
Fig. 6 is that Chengdu Plain ground vapour surveying work is distinguished Butut.
Fig. 7 is Hg constituent content figure in the Chengdu Plain A1 survey line ground vapour.
Fig. 8 is a Hg constituent content sectional view in the Chengdu Plain A2 survey line ground vapour.
Fig. 9 is a Hg constituent content sectional view in the Chengdu Plain A3 survey line ground vapour.
Figure 10 is a Hg constituent content sectional view in the Chengdu Plain B1 survey line ground vapour.
Figure 11 is a Hg constituent content sectional view in the Chengdu Plain B2 survey line ground vapour.
Figure 12 is a Hg constituent content sectional view in the Chengdu Plain C1 survey line ground vapour.
Figure 13 is a Hg constituent content sectional view in the Chengdu Plain C2 survey line ground vapour.
Figure 14 is a latent shape fracture synoptic diagram in the Chengdu Plain ground vapour surveying work district.
Figure 15 is Huang Jiaping-gulf section Cu+Pb+Zn of Liao family figure that adds up unusually.
Figure 16 is Huang Jia level ground among Figure 15-1, No. 2 unusual rare earth elements pattern comparison diagrams of Liao family's gulf section.
Embodiment:
Referring to Fig. 1, dynamically the ground vapour sampling apparatus comprises sampling thief 1, exsiccator 2, a drip catcher 3 and an aspiration pump 4.The sampling pipe 7 that contains air intake opening 5 and gas outlet 6 is arranged in the sampling thief of the total length 60cm that processes by aldary.Having on the sampling pipe has taper bit 8 on the end termination of air intake opening and the other end is apart from the gas outlet that there is inverted cone 9 at the 5cm place.Exsiccator is glass tubular, interior dress silica-gel desiccant and two ends dress filtering material.The air intake opening of exsiccator is communicated with gas outlet on the sampling pipe through first silica gel catheter 10.Have in the drip catcher and take mouthfuls 12 glass cylinder out of, the other end that mouthfuls 11 capture conduit 3-1 takes out of mouthful of bringing into that is fixed on the glass cylinder stretches in the glass cylinder.One end of second silica gel catheter 13 is communicated with the gas outlet of exsiccator and the other end is communicated with the capture duct inlet.Aspiration pump is connected with the outlet of drip catcher through the 3rd silica gel catheter 14;
Dynamic ground vapour sampling apparatus synoptic diagram when Fig. 2 is two drip catcher series connection.Dynamic ground vapour sampling apparatus structure shown in Figure 2 is basic and Fig. 1 is same, and not existing together is to have adopted two drip catchers.Be to adopt silica gel catheter 15 to be connected in series between two drip catchers.
The latent dynamic ground vapour measuring method of uranium ore of the regional grouan of the long row in embodiment 1 Guangdong.
Renhua long row in Guangdong has verified to contain in the area has uranium resource.Drilling data shows, how the uranium ore body of this area has buried depth dark (general orebody buried depth surpasses 200m, many orebody buried depths even surpass 600m), ore bed thin (tens centimetres to several meters), squat characteristics such as, is more typical grouan uranium ore.The rock of exposure in the workspace; Be mainly the early stage seriate biotite granite in the Yanshan Mountain; Middle grain biotite granite; Secondly middle coarse grain biotite granite, particulate, middle particulate two-mica granite, particulate biotite granite are the grouan that Indo-Chinese epoch and Late Yanshan are invaded, the subsiliceous rock arteries and veins of a small amount of Late Yanshan.The district includes the ore deposit structural belt and grows, and the Extract Mineralized Alteration arteries and veins of having found has 11, and the ore body of having found is mainly composed and is stored in 61,78, No. 60 Extract Mineralized Alteration arteries and veins.
Prepare dynamic ground vapour sampling apparatus shown in Figure 2.On No. 60 Extract Mineralized Alteration arteries and veins, arranged two sections, carried out dynamic ground vapour and measure.Long respectively 410m of section and 510m, point is apart from 5～10m.During sampling, earlier with the guiding principle pricker on the face of land overlayer play gas production and hole about deeply 50cm; Then sampling thief is inserted boring, make on the sampling thief inverted cone block the aperture, get into gas production boring, connect sampling apparatus to stop face of land atmosphere; Open aspiration pump and bleed, speed of evacuation unification is controlled at 2L/min; The ground vapour material passes through the exsiccator drying successively, and the drip catcher that gets into two series connection shown in Figure 2 is again captured by liquid trapping agent, every measuring point sampling time 30min.Liquid trapping agent is that the concentration expressed in percentage by weight by the pure nitric acid of BV-III level and ultrapure water configuration is rare nitric acid of 5%, each drip catcher dress 20ml liquid state trapping agent.After the sampling,, pour in the clean polytetrafluoroethylene beaker, place to be heated to 120 ℃ on the electric hot plate, keep about 4h, do near evaporation, splash into 5% rare nitric acid (pure liquid trapping solution) again and be settled to 5ml until sample earlier with the sample mix in two drip catchers.Then this concentrated liquid sample is detected with ICP-MS, the object element of detection comprises kind of element surplus Zn, Pb, Cu, Ni, U, Th, Cs, Co, Sc, Cr, Mn, Sr, Rb, Au, W, Mo, Bi, the rare earth etc. 30.
According to the ground vapour measurement result, drawn the multielement sectional view, like Fig. 3, shown in Figure 4.Above latent uranium ore body all to there being tangible ground vapour U unusual.In addition, in the ground vapour exceptions area of uranium, also have the ground vapour of elements such as Pb, Zn, Sr, Mn unusual.Warp and this district's uranium ore principal element comparison, these present unusual element, also are the principal elements in the uranium ore of mining area.Be that the combination of unusual element combinations of ground vapour and the essential element in the uranium ore is a basically identical.Because uranium ore middle rare earth element all has obvious enrichment, therefore also appear unusually at ground vapour U exceptions area rare earth, the normalization total amount of light rare earth has almost completely consistent distribution characteristics with the ground vapour curve of U.In addition, drawn ground vapour middle rare earth element allocation model figure, the partition of rare earth element pattern of drilling the uranium ore that obtains with the locality compares, and can know that uranium ground vapour exceptions area and ore body middle rare earth elemental partition pattern are consistent, and is as shown in Figure 5.Measurement result proves that dynamically ground vapour is measured the latent uranium ore body that can detect the nearly 700m of buried depth, and the indication ore body is at the projected position on the face of land.I is No. two ground vapour exceptions area rare earth elements pattern figure among Fig. 5; II is a ground vapour exceptions area rare earth elements pattern figure; III is No. two uranium ore rare earth elements pattern figure; IV is a uranium ore rare earth elements pattern figure.
The dynamic ground vapour measuring method of embodiment 2 Chengdu Plain buried faults
According to the data speculation of Sichuan geology and minerals bureau, the Pengzhou of Chengdu Plain-Tang Changyi band is positioned at the Longmenshan structural belt southeast to be surveyed, and possibly grow has many group buried faults, overall trend for east northeast to.According to the buried faults position of inferring, two zones have been selected in the western part, Tang Chang town and the northwestward in the Pixian County respectively, and a zone has been selected the northeast in the Li Chun town in the Pengzhou, carries out many sections ground vapour surveying work.The distribution of workspace is as shown in Figure 6, and A has arranged in the district 3 ground vapour measurement sections (A1, A2, A3), and the about 300m of line-spacing has 21 measuring points on every section; 2 sections in B district (B1, B2), the about 800m of line-spacing has 29 measuring points on every section; 2 sections in C district (C1, C2), the about 1700m of line-spacing has 30 measuring points on every section; On all sections, point is apart from being 30m.The buried faults trend of profile direction and prediction intersects.
The ground vapour method of sampling is the same with embodiment 1, does not exist together to be to use single drip catcher shown in Figure 1.Analyzed Hg element in the sample with ICP-MS.According to the ground vapour measurement result, drawn the Hg concentration profile figure of each section, find all to have on each section Hg unusual, like Fig. 6～shown in Figure 13.In same survey district, ground vapour is zonal arrangement unusually; 3 abnormal belt of surveying the district be east northeast to, bandwidth is in 90～150m scope.Ground vapour has reflected the position and the trend of local buried faults unusually; And the characteristics of measuring according to ground vapour, the ground vapour abnormal belt should be positioned at the vertical projection top of buried faults, and the width of abnormal belt can reflect the width of buried faults.Comprehensive these information draw: have buried faults in the workspace; It is through northwest, Tang Chang town; With about 1 km of Tang Chang town vertical range, its trend is about NE50 °, fracture width (also possibly be the combined width of many micro-fractures) 90～150 m; Conform to the data speculation of geology and minerals bureau, shown in figure 14.
Embodiment 3 a thousand li mountains-ride the plumbous zinc ore in mountain range, field to reconnoitre the dynamic ground vapour measurement in district
Hunan Province's Guiyang County is domestic rides mountain range, field rock mass and adjacent area is located in the Nan Ling metallogenic belt, is the important nonferrous metals ore Ji Qu of China.For synthetic study is carried out in this zone, further carry out and look for the miner to do, to have laid from the yellow sand level ground to Liao family gulf, the ground vapour of long 60 km is measured section (being decided to be " yellow sand level ground-Liao family's gulf section "), has accomplished the dynamic ground vapour surveying work of 418 measuring points.
Yellow sand level ground-Liao family's gulf section is from about 1000m place, west side in mine, yellow sand level ground, to the east of Liao family gulf, roughly is northern west and passes through and ride mountain range, field rock mass.Background area ground vapour measurement point distance is 250m; Predicted anomaly district's point is apart from encrypting 20～40m.Ground vapour surveying work method is the same with embodiment 1, and the object element of measurement comprises totally 37 kinds of elements such as Cu, Zn, Pb, W, Mo, Bi, Mn, Th, U, Ag, Au, As, Hg, rare earth.Owing to is target with the plumbous zinc ore of main searching, select Pb, Zn, three kinds of elements of Cu, its data are carried out normalization, superimposed again, drawn the element sectional view that adds up, shown in figure 15.By changing the measurement data statistic law traditionally, after the rejecting abnormalities data,, and combine geological boundary according to the difference directly perceived of background value, subregion is added up yellow sand level ground-Liao family's gulf section ground vapour measurement result.Getting its mean value is background value, and it is anomaly threshold that background value adds 3 times of standard deviations, marks off 6 exceptions area.Wherein No. 1 exceptions area is known ore anomaly district (after unusual the delimitation, seeing plumbous zinc ore industry ore body in the 186m deep in the boring of this district laying), and No. 2 exceptions area is positioned near the grey petrographic province of riding mountain range, field rock mass, and unusual 3 to 6 are distributed in and ride in the granite of mountain range, field.
Because No. 1 ground vapour exceptions area is caused unusually for the deep orebody that discloses turns out to be the ore deposit, to make up be basically identical to the essential element of element combinations and yellow sand level ground lead-zinc ore in this district's ground vapour, explains that ground vapour indicated the existence of deep concealed ore body unusually.
No. 2 unusual and No. 1 exception class seemingly also have Cu, Pb, Zn, W, Mo, Bi, Cr, Co, the combination of Mn abnormal elements, and unusual continuity are good.Contrast unusual (mean value) rare earth elements pattern (Figure 16) 1, No. 2, both have almost completely the same forms of distribution.This shows, can be evaluated as plumbous zinc ore unusually No. 2 to cause unusually, adds that two unusual geologic medias are also relatively more consistent, can determine basically for newly looking for the target area, ore deposit.V is a ground vapour exceptions area rare earth elements pattern figure among Figure 16.VI is No. two ground vapour exceptions area rare earth elements pattern figure.
3～No. 6 unusual equal outputs are in granite, and its rare earth elements pattern and No. 1 unusual normalized patterns have than notable difference.Explanation possibly exist and No. 1 unusual different porphyry type nonferrous metals ore in these zones.
The foregoing description is that foregoing of the present invention is further described, but should this scope that is interpreted as the above-mentioned theme of the present invention only not limited to the foregoing description.All technology that realizes based on foregoing all belong to scope of the present invention.
Claims (3)
1. the adjustable dynamic ground vapour measuring method of efficient, this method may further comprise the steps:
1); Prepare the adjustable dynamic ground vapour sampling apparatus of sampling efficiency: dynamically the ground vapour sampling apparatus comprises sampling thief, exsiccator, at least one drip catcher and aspiration pump; Having in the sampling thief has taper bit on the end termination that air intake opening is arranged on the sampling pipe that contains air intake opening and gas outlet, the sampling pipe and the other end and gas outlet adjacent have inverted cone; Exsiccator is glass tubular, interior dress silica-gel desiccant and two ends dress filtering material; The air intake opening of exsiccator is connected with gas outlet on the sampling pipe through first silica gel catheter; Glass container is arranged in the drip catcher, be fixed on and on the end of the capture conduit on the glass container import arranged and have the other end of outlet to stretch in the glass container; Outlet is arranged on the glass container, and an end of second silica gel catheter is connected with the gas outlet of exsiccator and the other end is connected with the capture duct inlet, and aspiration pump is connected with the outlet of drip catcher through the 3rd silica gel catheter;
2), ground vapour is measured:
1. according to looking for the ore deposit or looking for the structure target, arrange open-air ground vapour measurement section;
2. during field sampling, overlayer is played gas production boring on the face of land earlier, and dark 50～80cm inserts boring with sampling thief, makes on the sampling thief inverted cone block the aperture, gets into gas production boring to stop face of land atmosphere;
3. the liquid trapping agent of in drip catcher, packing into; Connect dynamic ground vapour sampling apparatus; Open aspiration pump, make rate of air sucked in required maintain 1.5～3L/min, extract and be free on the ground vapour material in the overlayer space; Liquid trapping agent is to be rare nitric acid of 5% by the concentration expressed in percentage by weight that pure nitric acid of BV-III and ultrapure water dispose, and liquid trapping agent consumption is 15～25ml in each drip catcher;
4. make the ground vapour material dry through exsiccator earlier, get into drip catcher again and captured by liquid trapping agent, the sampling time is 20～60min;
5. concentrate the liquid trapping agent after sampling: the liquid trapping agent after will sampling is earlier poured in the clean polytetrafluoroethylene beaker; Place to be heated to 120 ℃ on the electric hot plate at least, keep 3-5h, do near evaporation until sample; Splash into concentration expressed in percentage by weight by pure nitric acid of BV-III and ultrapure water configuration again and be rare nitric acid of 5%; Be settled to 5ml, adopt the drip catcher of a plurality of series connection, concentrate again after will the liquid trapping agent in a plurality of drip catchers being mixed earlier;
6. the trapping agent sample after concentrating carries out multielement analysis with icp ms, obtains the concentration information of Zn, Pb, Cu, Ni, U, Th, Cs, Co, Sc, Cr, Mn, Sr, Rb, Au, W, Mo, Bi, REE in the ground vapour; According to the concentration of multielement in the different mining sampling point ground vapour, draw multielement sectional view, plane equal-value map and/or REE allocation model figure, latent metallic ore of exploration or latent tectonic structure.
2. according to claim 1 or claim 2 the adjustable dynamic ground vapour measuring method of efficient is characterized in that 2), 3. during step, rate of air sucked in required maintains 2L/min, liquid trapping agent consumption is 20ml in each drip catcher; Per 2) 4. during step, the sampling time is 30 min; 2) 5. during step, the liquid trapping agent after the sampling is heated to 120 ℃ on electric hot plate, keep 4h.
3. according to claim 1 or claim 2 the adjustable dynamic ground vapour measuring method of efficient is characterized in that the drip catcher in the dynamic ground vapour sampling apparatus is two, adopts the silica gel catheter series connection.
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| CN108693299A (en) * | 2018-03-21 | 2018-10-23 | 中国地质大学（武汉） | A kind of method of prospecting using soil activation sulfate |
| CN110044662A (en) * | 2019-05-16 | 2019-07-23 | 中国地质科学院地球物理地球化学勘查研究所 | A kind of ground vapour nanoparticle separation and collection device and capture method |
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