CN101915682A - Soil or settlement soluble iron in-situ sampling device and in-situ sampling and testing method thereof - Google Patents

Soil or settlement soluble iron in-situ sampling device and in-situ sampling and testing method thereof Download PDF

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Publication number
CN101915682A
CN101915682A CN 201010240920 CN201010240920A CN101915682A CN 101915682 A CN101915682 A CN 101915682A CN 201010240920 CN201010240920 CN 201010240920 CN 201010240920 A CN201010240920 A CN 201010240920A CN 101915682 A CN101915682 A CN 101915682A
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potter
soil
stainless
plastics
drinking
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邹元春
姜明
吕宪国
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Northeast Institute of Geography and Agroecology of CAS
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Northeast Institute of Geography and Agroecology of CAS
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Abstract

The invention discloses a soil or settlement soluble iron in-situ sampling device and an in-situ sampling and testing method thereof, which relate to a soil or settlement soluble iron sampling device and a sampling and testing method thereof. The method solves the problems of high destructiveness, long time consumption, incapability of stabilizing Fe<2+> and Fe<3+> at the same time and low measurement result accuracy of the conventional soluble iron in-situ sampling and testing method. In the sampling device of the invention, a stainless steel drilling bit, a china clay water collecting tube and a second stainless steel are arranged from bottom up; and a plastic exhaust pipe and a plastic water draining pipe are inserted into a second stainless steel pipe. The method comprises the following process steps: drilling a sampling point with the drill bit; exhausting air to produce negative pressure; waiting for collecting water; preparing a color-developing agent; absorbing the color-developing agent and pore water; injecting into a brown ground glass stoppered bottle; measuring the Fe<2+> content by using a colorimetric method; measuring the total iron content by using the colorimetric method; and obtaining the Fe<3+> content by substracting the Fe<2+> content from the total iron content. The device and the method are suitable to be used in soil or settlement soluble iron in-situ sampling and test techniques.

Description

The situ sampling device and of a kind of soil or settlement soluble iron and original position sampling determination method thereof
Technical field
The present invention relates to a kind of soil or settlement soluble iron sampling apparatus and sampling determination method thereof.
Background technology
Soluble iron in the soil liquid and the sediment pore water is responsive to the environmental change response, the a lot of material conversion process that participated in to a great extent carrying out in soil and sediment inside (as the decomposition of the dissolving of the migration of soluble substance, mineral, organic substance with synthetic etc.) play certain control action to the geochemistry circulation of other trace element and nucleic.There are some researches show, soluble iron concentration be elevated to a certain degree after, can cause that plant is poisoned, cationic displacement and direct results such as phosphorus and the deliquescent increase of silicon in the rising of soil liquid pH value, soil crystal exchange site.Therefore, accurately measure soluble iron in soil or the sediment and become one of the basis of correlative study and prerequisite.
At first, the mensuration to soluble iron all needs destructive sampling traditionally, and soil or sediment are excavated, and send the laboratory centrifugal, obtains the soil liquid or sediment pore water, and the soluble iron that is difficult to this point of repetition continuous monitoring is dynamic.Experiment shows works as pH=7, when the dividing potential drop of oxygen is 0.21 atmospheric pressure, and Fe 2+Half oxidization time have only 4 minutes, this is that the iron valence state is difficult to stable internal cause, and iron is composed the changeableness that iron oxidation in the dis environment or reduction microbial action and photochemical oxidation or reducing action have further increased the iron valence state.In addition, even experimental results show that and use Phen, sample is placed after 2.5 hours more fixedly Fe 2+, to Fe 2+Measured value will significantly reduce, therefore need on-site measurement fast.Classic method is destructive big, length consuming time, and acidifying still is that the stored refrigerated sample all is difficult to guarantee Fe 2+Not oxidized, the measurement result accuracy is not high.This shows that developing on-the-spot Direct Sampling determination techniques is the active demand of association area research and application.
Secondly, classic method is directly utilized Phen or luxuriant and rich with fragrance Lip river piperazine and Fe 2+After the complexing colour developing, colorimetric estimation Fe 2+Content, and utilize chemical reducing agent photo-reduction Fe 3+After, the colorimetric estimation total iron content calculates the poor of the two at last, obtains Fe 3+Content.Yet no matter the Phen method still is a luxuriant and rich with fragrance Lip river piperazine method, and the use of single complexing agent is in that a shortcoming is fundamentally all arranged, promptly separately to Fe 2+Or Fe 3+Complexing may cause Fe 2+-Fe 3+Balance equation is because mass action and to the side shifting that complexing takes place, thereby makes higher by the measured value of chelated iron ion.Therefore, more satisfactory method is to stablize Fe simultaneously 2+And Fe 3+
Summary of the invention
The objective of the invention is for the original position sampling determination method that solves traditional soluble iron exist destructive big, length consuming time can't be stablized Fe simultaneously 2+And Fe 3+, the problem that the measurement result accuracy is low, and then the situ sampling device and and the original position sampling determination method thereof of a kind of soil or settlement soluble iron are provided.
The situ sampling device and of a kind of soil of the present invention or settlement soluble iron is by the stainless steel drill bit, the potter's clay collector pipe, first stainless-steel tube, second stainless-steel tube, the plastics exhaust tube, the plastics drinking-water pipe, swing handle, exhaust tube interface valve, drinking-water pipe interface valve and aspirator are formed, described stainless steel drill bit is fixedly mounted on the lower surface of potter's clay collector pipe, second stainless-steel tube is fixedly mounted on the upper surface of potter's clay collector pipe, evenly offer a plurality of inlet openings on the tube wall of described first stainless-steel tube, first stainless-steel tube is coated on the outer wall of potter's clay collector pipe, described swing handle sealing and fixing is installed on the upper surface of second stainless-steel tube, described plastics exhaust tube and plastics drinking-water pipe are inserted in second stainless-steel tube side by side, the upper end of plastics exhaust tube passes swing handle and is connected with exhaust tube interface valve, the lower end of plastics exhaust tube places in the potter's clay collector pipe and is positioned at the top of potter's clay collector pipe, the upper end of plastics drinking-water pipe passes swing handle and is connected with drinking-water pipe interface valve, the lower end of plastics drinking-water pipe places in the potter's clay collector pipe and is positioned at the bottom of potter's clay collector pipe, be connected with exhaust tube interface valve when described aspirator is bled, be connected with drinking-water pipe interface valve when aspirator draws water.
The step of the original position sampling determination method of a kind of soil of the present invention or settlement soluble iron is:
Step 1, push down swing handle at sampling point to be measured, the collaborative potter's clay collector pipe of stainless steel drill bit pierces soil or sediment certain depth;
Step 2, close drinking-water pipe interface valve, aspirator is communicated with the plastics exhaust tube by exhaust tube interface valve, extract the interior air of potter's clay collector pipe out, the acquisition negative pressure;
Step 3, close exhaust tube interface valve, in soil or sediment, collect pore water 40～50 mL;
Step 4, dispose EDTA and the BPDS developer that molarity is 0.001 mol/L respectively;
Step 5, extract aspirator and suck 15 mLEDTA and BPDS developer respectively after, be communicated with the plastics drinking-water pipe;
Step 6, utilize aspirator that pore water 30 mL that collect are sucked aspirator again, and after EDTA and BPDS developer mix, change in the brown ground glass stoppered bottle of 50 mL, after treating that liquid overflows the interior air of the brown ground glass stoppered bottle of discharge, screw lid, send into the laboratory;
Step 7, employing colorimetric method for determining Fe 2+Content, the detection wavelength of colourimetry is 535 nm;
Step 8, change the flint glass bottle over to, be exposed to 1 week under the fluorescent light, Fe 3+-EDTA all is converted into Fe 2+Behind-the BPDS, adopt the content of the total iron of colorimetric method for determining, the detection wavelength of colourimetry is 535 nm;
The content and the Fe of step 9, total iron 2+Content difference subtract and obtain Fe 3+Content.
The present invention compared with prior art has following beneficial effect: the present invention promptly inserts promptly to adopt promptly and fixes, simple to operate orderly, save time the harm of avoiding destructive sampling that sampled point is caused, effectively avoid the variation of valence that causes because of the introducing air in the sampling process, measured Fe exactly simultaneously 2+And Fe 3+, do not need other buffering agent and screener, and Fe 2+The lower limit that detects reach 0.05 mg/L.The present invention is used at marsh, Three River Plain wetland under the project supports such as project of national nature science fund project " migration of wetland soil iron under the different hydrology landforms transforms and environment is accused of ", " wetland Tie Tong amount change in time and space and with the research of nitrogen and phosphorous nutrient coupling process ", by statistical test to measurement result, than traditional assay method precision on average improve more than 8%.
Description of drawings
Fig. 1 is the state of the bleeding front view of situ sampling device and of the present invention, and Fig. 2 is the state that the draws water front view of situ sampling device and of the present invention, and Fig. 3 is a place partial enlarged drawing of Fig. 1.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1-Fig. 3, a kind of soil of present embodiment or the situ sampling device and of settlement soluble iron are by stainless steel drill bit 1, potter's clay collector pipe 2, first stainless-steel tube 3, second stainless-steel tube 4, plastics exhaust tube 5, plastics drinking-water pipe 6, swing handle 7, exhaust tube interface valve 8, drinking-water pipe interface valve 9 and aspirator 10 are formed, described stainless steel drill bit 1 is fixedly mounted on the lower surface of potter's clay collector pipe 2, second stainless-steel tube 4 is fixedly mounted on the upper surface of potter's clay collector pipe 2, evenly offer a plurality of inlet opening 3-1 on the tube wall of described first stainless-steel tube 3, first stainless-steel tube 3 is coated on the outer wall of potter's clay collector pipe 2, described swing handle 7 sealing and fixing are installed on the upper surface of second stainless-steel tube 4, described plastics exhaust tube 5 and plastics drinking-water pipe 6 are inserted in second stainless-steel tube 4 side by side, the upper end of plastics exhaust tube 5 passes swing handle 7 and is connected with exhaust tube interface valve 8, the lower end of plastics exhaust tube 5 places in the potter's clay collector pipe 2 and is positioned at the top of potter's clay collector pipe 2, the upper end of plastics drinking-water pipe 6 passes swing handle 7 and is connected with drinking-water pipe interface valve 9, the lower end of plastics drinking-water pipe 6 places in the potter's clay collector pipe 2 and is positioned at the bottom of potter's clay collector pipe 2, be connected with exhaust tube interface valve 8 when described aspirator 10 is bled, be connected with drinking-water pipe interface valve 9 when aspirator 10 draws water.
Aspirator 10 in the present embodiment is a prior art, for example can adopt syringe.
Embodiment two: in conjunction with Fig. 1-Fig. 3 present embodiment is described, the step of the original position sampling determination method of a kind of soil of present embodiment or settlement soluble iron is:
Step 1, push down swing handle 7 at sampling point to be measured, stainless steel drill bit 1 collaborative potter's clay collector pipe 2 pierces soil or sediment certain depth; Sampling depth when the concrete degree of depth is taked is per sample laid needs, and for example the degree of depth is 5cm, 10cm, 20cm or 40cm;
Step 2, close drinking-water pipe interface valve 9, aspirator 10 is communicated with plastics exhaust tube 5 by exhaust tube interface valve 8, extract the interior air of potter's clay collector pipe 2 out, the acquisition negative pressure;
Step 3, close exhaust tube interface valve 8, in soil or sediment, collect pore water 40～50 mL;
Step 4, dispose EDTA and the BPDS developer that molarity is 0.001 mol/L respectively;
Step 5, extract aspirator 10 and suck 15 mLEDTA and BPDS developer respectively after, be communicated with plastics drinking-water pipe 6;
Step 6, utilize aspirator 10 that pore water 30 mL that collect are sucked aspirator 10 again, and after EDTA and BPDS developer mix, change in the brown ground glass stoppered bottle of 50 mL, after treating that liquid overflows the interior air of the brown ground glass stoppered bottle of discharge, screw lid, send into the laboratory;
Step 7, employing colorimetric method for determining Fe 2+Content, the detection wavelength of colourimetry is 535 nm;
Step 8, change the flint glass bottle over to, be exposed to 1 week under the fluorescent light, Fe 3+-EDTA all is converted into Fe 2+Behind-the BPDS, adopt the content of the total iron of colorimetric method for determining, the detection wavelength of colourimetry is 535 nm;
The content and the Fe of step 9, total iron 2+Content difference subtract and obtain Fe 3+Content.
In the step 1 of present embodiment,, therefore do not need soil liquid sample is done the pre-treatment of 0.45 μ m membrane filtration, can directly measure the solubility total iron content because the hole of potter's clay collector pipe 2 is 0.2 μ m; The English full name of EDTA in the step 4 is Ethylene Diamine Tetraacetic Acid, and Chinese implication is an ethylenediamine tetraacetic acid; The English full name of BPDS in the step 4 is Bathophenanthrolinedisulfonic acid disodium salt, and Chinese implication is: the bathophenanthroline sodium disulfonate.
The original position sampling determination method of present embodiment is based on that the situ sampling device and of embodiment one described a kind of soil or settlement soluble iron realizes.

Claims (2)

1. the situ sampling device and of soil or settlement soluble iron, it is characterized in that: described situ sampling device and is by stainless steel drill bit (1), potter's clay collector pipe (2), first stainless-steel tube (3), second stainless-steel tube (4), plastics exhaust tube (5), plastics drinking-water pipe (6), swing handle (7), exhaust tube interface valve (8), drinking-water pipe interface valve (9) and aspirator (10) are formed, described stainless steel drill bit (1) is fixedly mounted on the lower surface of potter's clay collector pipe (2), second stainless-steel tube (4) is fixedly mounted on the upper surface of potter's clay collector pipe (2), evenly offer a plurality of inlet openings (3-1) on the tube wall of described first stainless-steel tube (3), first stainless-steel tube (3) is coated on the outer wall of potter's clay collector pipe (2), described swing handle (7) sealing and fixing is installed on the upper surface of second stainless-steel tube (4), described plastics exhaust tube (5) and plastics drinking-water pipe (6) are inserted in second stainless-steel tube (4) side by side, the upper end of plastics exhaust tube (5) passes swing handle (7) and is connected with exhaust tube interface valve (8), the lower end of plastics exhaust tube (5) places in the potter's clay collector pipe (2) and is positioned at the top of potter's clay collector pipe (2), the upper end of plastics drinking-water pipe (6) passes swing handle (7) and is connected with drinking-water pipe interface valve (9), the lower end of plastics drinking-water pipe (6) places in the potter's clay collector pipe (2) and is positioned at the bottom of potter's clay collector pipe (2), described aspirator (10) is connected with exhaust tube interface valve (8) when bleeding, and aspirator (10) is connected with drinking-water pipe interface valve (9) when drawing water.
2. a kind of soil realized based on the situ sampling device and of described a kind of soil of claim 1 or settlement soluble iron or the original position sampling determination method of settlement soluble iron, it is characterized in that: the step of original position sampling determination method is:
Step 1, push down swing handle (7) at sampling point to be measured, the collaborative potter's clay collector pipe (2) of stainless steel drill bit (1) pierces soil or sediment certain depth;
Step 2, close drinking-water pipe interface valve (9), aspirator (10) is communicated with plastics exhaust tube (5) by exhaust tube interface valve (8), extract the interior air of potter's clay collector pipe (2) out, the acquisition negative pressure;
Step 3, close exhaust tube interface valve (8), in soil or sediment, collect pore water 40～50 mL;
Step 4, dispose EDTA and the BPDS developer that molarity is 0.001 mol/L respectively;
Step 5, extract aspirator (10) and suck 15 mL EDTA and BPDS developer respectively after, be communicated with plastics drinking-water pipe (6);
Step 6, utilize aspirator (10) that pore water 30 mL that collect are sucked aspirator (10) again, and after EDTA and BPDS developer mix, change in the brown ground glass stoppered bottle of 50 mL, after treating that liquid overflows the interior air of the brown ground glass stoppered bottle of discharge, screw lid, send into the laboratory;
Step 7, employing colorimetric method for determining Fe 2+Content, the detection wavelength of colourimetry is 535 nm;
Step 8, change the flint glass bottle over to, be exposed to 1 week under the fluorescent light, Fe 3+-EDTA all is converted into Fe 2+Behind-the BPDS, adopt the content of the total iron of colorimetric method for determining, the detection wavelength of colourimetry is 535 nm;
The content and the Fe of step 9, total iron 2+Content difference subtract and obtain Fe 3+Content.
CN 201010240920 2010-07-30 2010-07-30 Soil or settlement soluble iron in-situ sampling device and in-situ sampling and testing method thereof Pending CN101915682A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103323290A (en) * 2013-05-14 2013-09-25 北京建工环境修复有限责任公司 Sampler for sediment pore water sampling in rivers or lakes
CN103454119A (en) * 2012-08-21 2013-12-18 中国科学院、水利部成都山地灾害与环境研究所 Portable soil moisture in-situ collector
CN104198403A (en) * 2014-02-26 2014-12-10 皖西学院 Content detecting method of Fe<3+> in water environment by colorimetric method
CN104458339A (en) * 2014-11-07 2015-03-25 中国科学院东北地理与农业生态研究所 Fixed depth pore water monitoring sampler and sampling method
CN104990917A (en) * 2015-07-07 2015-10-21 王兆华 Method for quantitatively analyzing steel surface rusting and corrosion degree
CN104990765A (en) * 2015-07-10 2015-10-21 华南理工大学 Instrument and method for monitoring inshore and estuary sedimentary layer pore water
CN108226262A (en) * 2018-01-31 2018-06-29 中国地质大学（武汉） The original position and dystopy detection device of detection different depth soil pH and Eh and method
CN108458894A (en) * 2016-12-16 2018-08-28 中国科学院南京土壤研究所 A kind of portable integrated soil and soil liquid harvester
CN109342111A (en) * 2018-10-30 2019-02-15 哈尔滨工业大学 A kind of soil allelochemical in situ sampling-micro-extraction device based on capillarity
CN111076964A (en) * 2019-12-27 2020-04-28 中国科学院生态环境研究中心 In-situ collection device and method for soluble substances
CN111397969A (en) * 2020-04-22 2020-07-10 南京信息工程大学 Passive in-situ high-resolution pore water sampling device and sampling method

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103454119A (en) * 2012-08-21 2013-12-18 中国科学院、水利部成都山地灾害与环境研究所 Portable soil moisture in-situ collector
CN103323290A (en) * 2013-05-14 2013-09-25 北京建工环境修复有限责任公司 Sampler for sediment pore water sampling in rivers or lakes
CN104198403A (en) * 2014-02-26 2014-12-10 皖西学院 Content detecting method of Fe<3+> in water environment by colorimetric method
CN104458339A (en) * 2014-11-07 2015-03-25 中国科学院东北地理与农业生态研究所 Fixed depth pore water monitoring sampler and sampling method
CN104990917A (en) * 2015-07-07 2015-10-21 王兆华 Method for quantitatively analyzing steel surface rusting and corrosion degree
CN104990765A (en) * 2015-07-10 2015-10-21 华南理工大学 Instrument and method for monitoring inshore and estuary sedimentary layer pore water
CN108458894B (en) * 2016-12-16 2024-03-26 中国科学院南京土壤研究所 Portable integrated soil and soil solution collection system
CN108458894A (en) * 2016-12-16 2018-08-28 中国科学院南京土壤研究所 A kind of portable integrated soil and soil liquid harvester
CN108226262A (en) * 2018-01-31 2018-06-29 中国地质大学（武汉） The original position and dystopy detection device of detection different depth soil pH and Eh and method
CN109342111A (en) * 2018-10-30 2019-02-15 哈尔滨工业大学 A kind of soil allelochemical in situ sampling-micro-extraction device based on capillarity
CN111076964A (en) * 2019-12-27 2020-04-28 中国科学院生态环境研究中心 In-situ collection device and method for soluble substances
CN111076964B (en) * 2019-12-27 2021-04-06 中国科学院生态环境研究中心 In-situ collection device and method for soluble substances
CN111397969A (en) * 2020-04-22 2020-07-10 南京信息工程大学 Passive in-situ high-resolution pore water sampling device and sampling method
CN111397969B (en) * 2020-04-22 2022-03-08 南京信息工程大学 Passive in-situ high-resolution pore water sampling device and sampling method

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Application publication date: 20101215