CN106290059B - Device for measuring zero-valent iron content in nanoscale and micron-sized iron powder and application method thereof - Google Patents
Device for measuring zero-valent iron content in nanoscale and micron-sized iron powder and application method thereof Download PDFInfo
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Abstract
The invention provides a device for measuring the zero-valent iron content in nanoscale and micron-sized iron powder and a use method thereof, wherein the device comprises a U-shaped tube and an inverted Y-shaped tube; the left side pipe of U type pipe has the scale mark, the right side pipe mouth of U type pipe links to each other with the sample inlet of falling Y type pipe with the help of rubber tube and standard stopper, liquid at 0 scale mark or more is equipped with in the U type pipe. The device has higher test precision and the error range is within 5 percent; the portable oxygen-enriched water heater is convenient to carry, is not influenced by external factors such as temperature, oxygen content and the like, and can be used in field sites.
Description
Technical Field
The invention belongs to the field of water treatment, in particular to a water treatment technology using iron powder as a repairing agent, and particularly relates to a device for measuring the zero-valent iron content in nanoscale and micron-sized iron powder and a use method thereof.
Background
With the rapid development of the chemical industry, antibiotics, algae toxins, dyes and other pollutants are discharged into the environment, most substances and metabolites thereof have cancerogenic, teratogenic and mutagenic hazards, and the environmental and human health are extremely threatened, so that the environmental and human health is one of the important concerns. In recent years, iron powder has been paid attention to as a novel environment-friendly material for water environment restoration. In particular to nano zero-valent iron, which has small particles, large specific surface area and high reaction activity, can effectively remove pollutants such as heavy metals, chlorinated hydrocarbons and the like in water or soil, and becomes one of the leading-edge hot spots of environmental science research. In addition, the zero-valent iron powder has wide application in the fields of aviation, mechanical manufacturing and the like.
Traditional methods for synthesizing nano-iron (NZVI) are mainlyThe chemical synthesis method plays a positive role in developing NZVI for environmental remediation, however, the chemical method usually uses some toxic chemical substances such as reducing agents (sodium borohydride), organic solvents, non-biodegradable dispersing agents and stabilizing agents, and has the problems of high cost, secondary pollution and the like. In the restoration of polluted environment, the development of an environment-friendly and low-cost iron powder synthesis technology is a key problem faced by the technology in environmental restoration. At present, green synthesis technology is paid attention to, and many scientists currently use green tea, sorghum bran, eucalyptus leaves and the like to synthesize nanoscale iron powder, because organic acid and polyphenol in the materials can lead Fe 2+ The components can also be used as dispersing agents and masking agents of iron powder to prevent agglomeration and oxidation of the iron powder, so that high reactivity of the iron powder is ensured. Compared with the traditional chemical synthesis method, the green synthesis process avoids using toxic chemicals, reduces energy consumption, and has the characteristics of economy, environmental friendliness and the like.
The iron powder produced by any method can be rapidly oxidized in the air to lose the utilization value if the iron powder is not stored well. Therefore, the rapid determination of the zero-valent iron content in iron powder is an important task; for the determination of the zero-valent iron content in the iron powder, a simple, convenient and feasible method with accurate and reliable measurement results is necessary to be found, and the guarantee is provided for the application of the iron powder in various fields.
Common chemical detection methods such as atomic absorption spectroscopy, ion chromatography, and the like (analysis of Fe 2+ Or Fe (Fe) 3+ Is composed of the oxidized Fe in the surface oxide layer of iron powder and the Fe in the core part 0 Co-contributing) is difficult to analyze the effective zero-valent iron content of the iron powder after a certain aging time or reaction time.
The existing quantitative analysis method of zero-valent iron comprises a copper ion oxidation and hydrogen reduction method. The copper ion oxidation method is based on Cu 2+ Measuring the amount of consumption of zero-valent iron in iron powder, cu 2+ With Fe 0 The reaction product of (2) includes Cu and Cu 2 O, but Cu at the time of calculation 2 The O content is often ignored, and the zero-valent iron content measured by the method is often higher.
The hydrogen reduction method uses H 2 Reduction reaction with iron oxide in iron powder to determine reaction product H 2 The amount of O produced was calculated to determine the iron oxide content, and the zero-valent iron content was estimated by subtraction. The iron powder has a plurality of forms of oxides, and the forms have no fixed proportional relation, so that the zero-valent iron content cannot be accurately calculated according to the measured oxygen content, and the accuracy of the measurement result of the hydrogen reduction method is poor.
Fe for patent (application No. 201410243365.7) 3+ Adding iron powder into the solution, reacting for a certain time, adding chelating agent or complexing agent into the solution, and finally calculating Fe 3+ The increase in dissolved elemental iron in the solution was tested. In the method, the chelating agent or complexing agent is more than one of ethylenediamine tetraacetate, sulfosalicylate or thiocyanate, and the concentration of dissolved oxygen is controlled to be less than 1mg/L in the whole reaction process, and the whole test process needs 2-24 hours. The method has complex steps and complicated operation, causes a great deal of waste of reagents, needs to be tested under the oxygen limiting condition, has harsh test conditions and long reaction time, and causes large error of test results.
Patent (application number 201510176411.0) determines Fe in nano zero-valent iron particles by analyzing changes in spectral characteristics of azo dye solution before and after reaction with nano zero-valent iron particles 0 Is contained in the composition. The method comprises seven steps, uses more reagents, and has the defects of complicated steps, complex operation and reagent waste.
The prior literature also reports that H generated by fully reacting by dripping acid solution into nano zero-valent iron solution is collected 2 Finally, measuring the volume to detect the effective Fe 0 However, this method has many operational problems such as poor collection of hydrogen, and is prone to large detection errors.
Disclosure of Invention
The invention provides a device which has low manufacturing cost and simple operation and can accurately measure the zero-valent iron content in nanoscale and micron-sized iron powder at any time and any place, and a use method thereof, aiming at solving the problems in the prior art.
The invention adopts the technical scheme that: the device for measuring the zero-valent iron content in the nanoscale and micron-sized iron powder mainly comprises a U-shaped tube and an inverted Y-shaped tube; the left side pipe of U type pipe has the scale mark, the right side pipe mouth of U type pipe links to each other with the sample inlet of falling Y type pipe with the help of rubber tube and standard stopper, liquid at 0 scale mark or more is equipped with in the U type pipe.
Further, an inverted U-shaped branch pipe is arranged on the right side pipe of the U-shaped pipe, a first tower nozzle is arranged at the tail end of the inverted U-shaped branch pipe, and a second tower nozzle is arranged on the standard plug; the sample inlet of the inverted Y-shaped pipe is connected with the plug port end of the standard plug, and the rubber pipe is connected with the first pagoda nozzle and the second pagoda nozzle respectively.
Further, the distance between the first pagoda nozzle and the second pagoda nozzle is less than 0.5cm.
Further, the sample inlet of the inverted Y-shaped tube is a grinding port, and the model is 19/26 ports.
Furthermore, the U-shaped pipe, the inverted Y-shaped pipe and the standard plug are made of high borosilicate glass, and the thickness of the high borosilicate glass is 2mm.
Further, the liquid in the U-shaped pipe is water.
Further, the inner diameter of the U-shaped pipe is 1 cm-3 cm, the height of the U-shaped pipe is 20-30 cm, and the diameters of the first tower nozzle of the inverted U-shaped branch pipe and the second tower nozzle of the standard plug are smaller than 1cm.
The method for using the device for measuring the zero-valent iron content in the nanoscale and micron-sized iron powder according to claim 1, comprising the following steps:
a. the U-shaped pipe is vertically fixed, and the first tower mouth end of the U-shaped pipe is tightly connected with the second tower mouth of the standard plug by using a rubber pipe; adding water into the U-shaped pipe to enable the horizontal plane of the left pipe of the U-shaped pipe to be positioned at a position of 0ml and above;
b. weighing iron powder of M g, adding the iron powder and excessive diluted hydrochloric acid into two branch pipes of the inverted Y-shaped pipe respectively, sealing the inverted Y-shaped pipe with a standard plug, and recording that the scale of the horizontal plane at the left side of the U-shaped pipe is V Initially, the method comprises ml；
c. Recording the atmospheric pressure P1 kpa at the moment by an electronic barometer, and controlling the temperature T ℃;
d. will beThe inverted Y-shaped pipe is slowly inclined, so that the dilute hydrochloric acid in the branch pipe slowly flows into the branch pipe filled with the iron powder, and the scale of the horizontal plane at the left side of the U-shaped pipe is recorded as V after the reaction between the dilute hydrochloric acid and the iron powder is completed Powder (D) ml；
e. The content Y of zero-valent iron in the iron powder can be obtained by the following formula:
。
further, the dilute hydrochloric acid is prepared from 37% of concentrated hydrochloric acid and water according to a volume ratio of 1:1-1:4.
The experimental principle of the invention is as follows: the device generates hydrogen through the reaction of iron powder and dilute hydrochloric acid in two branch pipes of the inverted Y-shaped pipe, and the generated hydrogen pushes the water liquid level of the right pipe of the U-shaped pipe to drop, the water liquid level of the left pipe to rise, and the volume of the liquid level change is the volume V of the generated hydrogen 1 Record the atmospheric pressure P at that time 1 And air temperature T 1 。
The number of moles of hydrogen produced was calculated according to the following formula,
wherein: n is the mole number of hydrogen; p (P) 1 Is the measured atmospheric pressure; v (V) 1 To obtain a volume of hydrogen; t (T) N 273.15K, P N Is at standard atmospheric pressure (101325 Pa); v (V) N 22.4 liters; t (T) 1 The temperature measured (degrees celsius + 273.15K).
Fe+2hcl=fecl according to the reaction equation of iron with dilute hydrochloric acid 2 +H 2 ∈ knowing the mole number of Fe and H 2 The molar numbers n of the iron powder are equal, so that the mass of Fe is obtained, and the content of zero-valent iron is calculated according to the total mass of the iron powder added into the inverted Y-shaped tube.
The beneficial effects obtained by the invention are as follows: a. the device has higher test precision and the error range is within 5 percent; b. the device is convenient to carry, is not influenced by external factors such as temperature, oxygen content and the like, and can be used in field sites; c. the medicament used in the using process of the device is simple, the test can be completed only by concentrated hydrochloric acid and water, and the environmental pollution is small; d. the device adopts the glass tube with low cost to fire and uses the latex tube to connect, has the characteristics of low cost, environmental protection and no pollution of manufacturing materials and technology; e. the method is simple to operate, convenient to use and easy to master.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is the mass of coated NZVI and H generation 2 Is a graph of the volume of the sample.
Wherein, 1 represents U-shaped pipe, 2 represents the type of falling Y pipe, 3 represents the rubber tube, 4 represents standard stopper, 5 represents first pagoda mouth, 6 represents second pagoda mouth, 7 represents the type of falling U branch pipe.
Detailed Description
In order to make the technical scheme and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
a. And purchasing the coated NZVI for later use. Weighing 50ml of deionized water by using a 50ml measuring cylinder, pouring the 50ml of deionized water into a 100ml beaker, weighing 50ml of concentrated hydrochloric acid, pouring the 50ml of concentrated hydrochloric acid into the deionized water, uniformly stirring the mixture by using a glass rod, and preparing dilute hydrochloric acid with the volume ratio of the concentrated hydrochloric acid to the water being 1:1 for later use;
b. the U-shaped pipe 1 is vertically fixed by an iron stand, tap water is injected into the U-shaped pipe 1 to enable the liquid level of the U-shaped pipe to be level with a 0 scale mark, and a rubber pipe 3 is used for connecting a first pagoda nozzle 5 with a second pagoda nozzle 6;
c. weighing 11.38mg of purchased coated NZVI, adding the weighed NZVI into one branch pipe of the inverted Y-shaped pipe 2 by using a key, sucking excessive dilute hydrochloric acid by using a dropper, adding the excessive dilute hydrochloric acid into the other branch pipe of the inverted Y-shaped pipe 2, covering a standard plug 4 on a sample inlet of the inverted Y-shaped pipe 2, and recording the liquid level position at the moment as 0.6ml;
d. the inverted Y-shaped pipe 2 is gently inclined to enable the dilute hydrochloric acid in the branch pipe to slowly flow into the branch pipe of the NZVI to react with the coated NZVI, the liquid level position is recorded to be 3.6ml after the reaction is completed, and the volume of the generated hydrogen is 3.0ml after the liquid level rises by 3.0ml before the reaction;
e. the atmospheric pressure at this time was measured with an electronic barometer to be 99.06Kpa and the air temperature was 27.9 ℃;
f. according to the formulaThe molar number of hydrogen was calculated to be 0.12mM, according to the reaction equation fe+2hcl=fecl 2 +H 2 And ∈ calculating the molar number of pure nano iron to be 0.12mM, namely 6.72mg, and calculating the zero-valent iron content in the measured coated NZVI to be 6.72/11.38 x 100% = 59.05%.
Example 2
a. Purchasing the coated NZVI for later use; weighing 50ml of deionized water by using a 50ml measuring cylinder, pouring the 50ml of deionized water into a 100ml beaker, weighing 50ml of concentrated hydrochloric acid, pouring the 50ml of concentrated hydrochloric acid into the deionized water, uniformly stirring the mixture by using a glass rod, and preparing dilute hydrochloric acid with the volume ratio of the concentrated hydrochloric acid to the water being 1:1 for later use;
b. the U-shaped pipe 1 is vertically fixed by an iron stand, tap water is injected into the U-shaped pipe 1 to enable the liquid level of the U-shaped pipe to be level with a 0 scale mark, and the first tower nozzle 5 and the second tower nozzle 6 are connected by the rubber pipe 3.
c. Weighing 22.36mg of purchased coated NZVI, adding the weighed NZVI into one branch pipe of the inverted Y-shaped pipe by using a key, sucking excessive dilute hydrochloric acid by using a dropper, adding the excessive dilute hydrochloric acid into the other branch pipe of the inverted Y-shaped pipe 2, covering a standard plug 4 on a sample inlet of the inverted Y-shaped pipe 2, and recording that the liquid level position in the U-shaped pipe 1 is 0.6ml;
d. the inverted Y-shaped pipe 2 is gently inclined to enable the dilute hydrochloric acid in the branch pipe to slowly flow into the other branch pipe to react with the coated NZVI, the liquid level position is recorded to be 6.6ml after the reaction is completed, and the volume of the generated hydrogen is 6ml after the liquid level rises by 6ml before the reaction;
e. the atmospheric pressure at this time was measured with an electronic barometer to be 99.05Kpa and the air temperature was 26.9 ℃;
f. according to the formulaThe molar number of hydrogen was calculated to be 0.24mM, according to the reaction equation fe+2hcl=fecl 2 +H 2 And ∈ calculating the molar number of pure nano iron to be 0.24mM, namely 13.44mg, and calculating the zero-valent iron content in the measured coated NZVI to be 13.44/22.36 x 100% = 60.11%.
Example 3
a. And purchasing the coated NZVI for later use. Weighing 50ml of deionized water by using a 50ml measuring cylinder, pouring the 50ml of deionized water into a 100ml beaker, weighing 50ml of concentrated hydrochloric acid, pouring the 50ml of concentrated hydrochloric acid into the deionized water, uniformly stirring the mixture by using a glass rod, and preparing dilute hydrochloric acid with the volume ratio of the concentrated hydrochloric acid to the water being 1:2 for later use;
b. the U-shaped pipe 1 is vertically fixed by an iron stand, tap water is injected into the U-shaped pipe 1 to enable the liquid level of the U-shaped pipe to be level with 0 scale mark, and a rubber pipe 3 is used for connecting a first tower nozzle 5 and a second tower nozzle 6;
c. weighing 33.63mg of purchased coated NZVI, adding the weighed NZVI into one branch pipe of the inverted Y-shaped pipe 2 by using a key, sucking excessive dilute hydrochloric acid by using a dropper, adding the excessive dilute hydrochloric acid into the other branch pipe of the inverted Y-shaped pipe 2, covering a standard plug on a sample inlet of the inverted Y-shaped pipe 2, and recording the liquid level position at the moment as 0.6ml;
d. the inverted Y-shaped pipe 2 is gently inclined to enable the dilute hydrochloric acid in the branch pipe to slowly flow into the other branch pipe to react with the coated NZVI, the liquid level position is recorded to be 9.9ml after the reaction is completed, and the volume of the generated hydrogen is 9.3ml after the liquid level rises by 9.3ml before the reaction;
e. the atmospheric pressure at this time was measured with an electronic barometer to be 99.01Kpa and the air temperature was 26.8 ℃;
f. according to the formulaThe molar number of hydrogen was calculated to be 0.37mM, according to the reaction equation fe+2hcl=fecl 2 +H 2 And ∈ calculating the molar number of pure nano iron to be 0.37mM, namely 20.72mg, and calculating the zero-valent iron content in the measured coated NZVI to be 20.72/33.63 x 100% = 61.61%.
Example 4
a. And purchasing the coated NZVI for later use. Weighing 50ml of deionized water by using a 50ml measuring cylinder, pouring the 50ml of deionized water into a 100ml beaker, weighing 50ml of concentrated hydrochloric acid, pouring the 50ml of concentrated hydrochloric acid into the deionized water, uniformly stirring the mixture by using a glass rod, and preparing dilute hydrochloric acid with the volume ratio of the concentrated hydrochloric acid to the water being 1:2 for later use;
b. the U-shaped pipe 1 is vertically fixed by an iron stand, tap water is injected into the U-shaped pipe 1 to enable the liquid level of the U-shaped pipe to be level with 0 scale mark, and a rubber pipe 3 is used for connecting a first tower nozzle 5 and a second tower nozzle 6;
c. weighing 44.72mg of purchased coated NZVI, adding the weighed NZVI into one branch pipe of the inverted Y-shaped pipe 2 by using a key, sucking excessive diluted hydrochloric acid by using a dropper, adding the excessive diluted hydrochloric acid into the other branch pipe of the inverted Y-shaped pipe 2, covering a standard plug 4 on a sample inlet of the inverted Y-shaped pipe 2, and recording the liquid level position at the moment as 0.6ml;
d. the inverted Y-shaped pipe 2 is gently inclined to enable the dilute hydrochloric acid in the branch pipe to slowly flow into the other branch pipe to react with the coated NZVI, the liquid level position is recorded to be 12.6ml after the reaction is completed, and the volume of the generated hydrogen is 12ml after the liquid level rises by 12ml before the reaction;
e. the atmospheric pressure at this time was measured with an electronic barometer to be 99.04Kpa and the air temperature was 26.7 ℃;
f. according to the formulaCalculated hydrogen mole number was 0.48mM, according to the reaction equation fe+2hcl=fecl 2 +H 2 And ∈ calculating the molar number of the pure nano-iron to be 0.48mM, namely 26.88mg, so that the zero-valent iron content in the nano-iron of the measured coated NZVI is calculated to be 26.88/44.72 x 100% = 60.11%.
Example 5
a. And purchasing the coated NZVI for later use. Weighing 50ml of deionized water by using a 50ml measuring cylinder, pouring the 50ml of deionized water into a 100ml beaker, weighing 50ml of concentrated hydrochloric acid, pouring the 50ml of concentrated hydrochloric acid into the deionized water, uniformly stirring the mixture by using a glass rod, and preparing dilute hydrochloric acid with the volume ratio of the concentrated hydrochloric acid to the water being 1:4 for later use;
b. the U-shaped pipe 1 is vertically fixed by an iron stand, tap water is injected into the U-shaped pipe 1 to enable the liquid level of the U-shaped pipe to be level with 0 scale mark, and a rubber pipe 3 is used for connecting a first tower nozzle 5 and a second tower nozzle 6;
c. weighing 56.02mg of purchased coated NZVI, adding the weighed NZVI into one branch pipe of the inverted Y-shaped pipe by using a key, sucking excessive diluted hydrochloric acid by using a dropper, adding the excessive diluted hydrochloric acid into the other branch pipe of the inverted Y-shaped pipe 2, covering a standard plug 4 on a sample inlet of the inverted Y-shaped pipe 2, and recording that the liquid level position of the U-shaped pipe 1 is 0.6ml;
d. the inverted Y-shaped pipe 2 is gently inclined to enable the dilute hydrochloric acid in the branch pipe to slowly flow into the other branch pipe to react with the coated NZVI, the liquid level position is recorded to be 15.6ml after the reaction is completed, and the volume of the generated hydrogen is 15ml after the liquid level rises by 15ml before the reaction;
e. the atmospheric pressure at this time was measured with an electronic barometer to be 99.02Kpa and the air temperature was 26.7 ℃;
f. according to the formulaCalculated hydrogen mole number was 0.6mM, according to the reaction equation fe+2hcl=fecl 2 +H 2 And ∈ calculating the molar number of pure nano iron to be 0.6mM, namely 33.6mg, and calculating the zero-valent iron content in the measured coated NZVI to be 33.6/56.02 x 100% = 59.98%.
According to the above five embodiments, H is generated by taking the mass of the added coated NZVI as the X axis 2 The volume of (2) is plotted on the Y-axis, as shown in FIG. 2, the linear dependence of both is very good, R is seen in FIG. 2 2 =0.9992。
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. The device for measuring the zero-valent iron content in the nanoscale and micron-sized iron powder is characterized in that: mainly comprises a U-shaped pipe and an inverted Y-shaped pipe; the left side pipe of the U-shaped pipe is provided with scale marks, the right side pipe opening of the U-shaped pipe is connected with the sample inlet of the inverted Y-shaped pipe by virtue of a rubber pipe and a standard plug, and liquid with the level of 0 scale marks or more is filled in the U-shaped pipe;
the application method of the device for measuring the zero-valent iron content in the nanoscale and micron-sized iron powder comprises the following steps of:
a. the U-shaped pipe is vertically fixed, and the first tower mouth end of the U-shaped pipe is tightly connected with the second tower mouth of the standard plug by using a rubber pipe; adding water into the U-shaped pipe to enable the horizontal plane of the left pipe of the U-shaped pipe to be positioned at 0ml or above;
b. weighing iron powder with the mass of Mg, respectively adding the iron powder and excessive diluted hydrochloric acid into two branch pipes of the inverted Y-shaped pipe, sealing the inverted Y-shaped pipe by using a standard plug, and recording that the scale of the horizontal plane at the left side of the U-shaped pipe is V primary ml;
c. recording the atmospheric pressure P1 kpa at the moment by an electronic barometer, and controlling the temperature T ℃;
d. slowly inclining the inverted Y-shaped pipe to enable the dilute hydrochloric acid in the branch pipe to slowly flow into the branch pipe filled with iron powder, and recording the scale of the horizontal plane at the left side of the U-shaped pipe as V-powder ml at the moment after the dilute hydrochloric acid reacts with the iron powder completely;
e. the content Y of zero-valent iron in the iron powder can be obtained by the following formula:
the dilute hydrochloric acid is prepared from concentrated hydrochloric acid with the volume ratio of 37% to water being 1:1-1:4.
2. The apparatus for determining the zero-valent iron content of nano-scale and micro-scale iron powders according to claim 1, wherein: the right side pipe of the U-shaped pipe is provided with an inverted U-shaped branch pipe, the tail end of the inverted U-shaped branch pipe is provided with a first tower nozzle, and the standard plug is provided with a second tower nozzle; the sample inlet of the inverted Y-shaped pipe is connected with the plug port end of the standard plug, and the rubber pipe is connected with the first pagoda nozzle and the second pagoda nozzle respectively.
3. The apparatus for measuring the zero-valent iron content in nano-scale and micro-scale iron powders according to claim 2, wherein: the distance between the first tower nozzle and the second tower nozzle is smaller than 0.5cm.
4. The apparatus for determining the zero-valent iron content of nano-scale and micro-scale iron powders according to claim 1 or 2, wherein: the sample inlet of the inverted Y-shaped tube is a grinding port, and the model is 19/26 ports.
5. The apparatus for determining the zero-valent iron content of nano-scale and micro-scale iron powders according to claim 1 or 2, wherein: the U-shaped pipe, the inverted Y-shaped pipe and the standard plug are made of high borosilicate glass, and the thickness of the high borosilicate glass is 2mm.
6. The apparatus for determining the zero-valent iron content of nano-scale and micro-scale iron powders according to claim 1, wherein: the liquid in the U-shaped pipe is water.
7. The apparatus for measuring the zero-valent iron content in nano-scale and micro-scale iron powders according to claim 2, wherein: the inner diameter of the U-shaped pipe is 1 cm-3 cm, the height of the U-shaped pipe is 20 cm-30 cm, and the diameters of the first tower mouth of the inverted U-shaped branch pipe and the second tower mouth of the standard plug are smaller than 1cm.
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| CN108375528B (en) * | 2018-02-10 | 2024-01-26 | 中国地质科学院水文地质环境地质研究所 | Integrated device for measuring zero-valent iron content in nanoscale and micron-sized iron powder |
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