CN108627509A - In a kind of quick detection metal whether leaded method and its used test paper - Google Patents
In a kind of quick detection metal whether leaded method and its used test paper Download PDFInfo
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- CN108627509A CN108627509A CN201810525859.2A CN201810525859A CN108627509A CN 108627509 A CN108627509 A CN 108627509A CN 201810525859 A CN201810525859 A CN 201810525859A CN 108627509 A CN108627509 A CN 108627509A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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Abstract
The invention discloses in a kind of quick detection metal whether leaded method and its used test paper, the method includes：By I2It is dissolved in KI solution and constitutes test solution, wherein the content of KI is 50g/L, I2Content be 8g/L；The test solution is dipped with a piece of white paper, the test paper of moistening is made；The test paper is covered in metal surface to be detected on one side, metal to be detected is connected to the anode of 12V DC power supply by conducting wire, no lead metal is covered in the another side of test paper, no lead metal is connected to the cathode of 12V DC power supply by conducting wire；It detects whether leaded in metal to be detected.The present invention can be used for detect metal in it is whether leaded, prevent unexpected lead poisoning, testing cost is low, speed is fast, high sensitivity, easy to carry, nontoxic, is not damaged to metal surface to be detected.
Description
Technical field
The present invention relates to the detection method of lead, in especially a kind of quick detection metal whether leaded method, and should
Test paper used in detection method.
Background technology
In the prior art, metal is detected（Simple metal or alloy）In it is whether leaded, there are mainly two types of method：First, using light
Spectrometer is detected metal to be detected, second is that metal sampler to be detected is dissolved in acid, titrimetry.Spectral detection speed
Soon, metal to be measured is not damaged, but price is high, inconvenient to carry；Titrimetry is accurate, but damage metal to be measured, inconvenient to carry, consuming
Time.
Invention content
The object of the present invention is to provide in a kind of quick detection metal whether leaded method and its used test paper, can
It is whether leaded in tinware for detecting（Fake products is leaded）, it is whether leaded in unleaded welding rod, it is whether leaded in metalic tableware, it prevents from anticipating
Outer lead poisoning, testing cost is low, speed is fast, high sensitivity, easy to carry, nontoxic, is not damaged to metal surface to be detected
Wound.
To achieve the above object, the present invention adopts the following technical scheme that：
In a kind of quick detection metal whether leaded method, include the following steps：
Step 1：Configure test solution
By I2It is dissolved in KI solution and constitutes test solution, wherein the content of KI is 50g/L, I2Content be 8g/L；
Step 2：Make test paper
The test solution is dipped with a piece of white paper, the test paper of moistening is made；
Step 3：Connect circuit
The test paper is covered in metal surface to be detected on one side, metal to be detected is connected to 12V DC electricity by conducting wire
No lead metal is covered in the another side of test paper by the anode in source, and no lead metal is connected to the negative of 12V DC power supply by conducting wire
Pole；
Step 4：It detects whether leaded in metal to be detected
Power on, be powered at least one second, close power supply, take out test paper, if the one side that test paper covers metal to be detected becomes
For yellow, then contain lead in the metal to be detected, if the no yellow of one side that test paper covers metal to be detected is formed, institute
It states and is free of lead in metal to be detected.
The white paper is the filter paper or blotting paper that thickness is greater than or equal to 1 millimeter.
No lead metal is stainless steel substrates or cobalt sheet metal or platinum piece or gold plaque.
The area of the test paper is greater than or equal to 2 mm2。
It is a kind of for quickly detect in metal whether leaded test paper, the test paper includes white paper and immerses the white paper
The thickness of interior test solution, the white paper is greater than or equal to 1 millimeter；The test solution is Wagner's reagent, the wherein content of KI
For 50g/L, I2Content be 8g/L.
The white paper is the filter paper of white or the blotting paper of white, and the area of the test paper is greater than or equal to 2 mm2。
Compared with prior art the beneficial effects of the invention are as follows：Using above-mentioned technical proposal, can quickly judge to be detected
Whether metal is leaded, and being powered one second or so can measure as a result, this method is especially sensitive, as long as containing in metal to be detected
0.07% or more（Including 0.07%）Lead, the test paper can turn yellow（Generate the PbI having in yellow2）.It can be used for detecting tin
It is whether leaded in device（Fake products is leaded）, it is whether leaded in unleaded welding rod, it is whether leaded in metalic tableware, metal cup, it prevents from anticipating
Outer lead poisoning.The present invention this detection method, it is at low cost, detection it is quick, sensitive, the carryings such as 12V power supplys and test paper are very square
Just, nontoxic, metal surface to be detected is not damaged, unexpected advantageous effect is achieved.Certainly, side of the invention
There is also deficiencies for method：It is single from the difference of test paper yellow can not judge lead tolerance number.
The detection method of the present invention, not only quickly, and also it is sensitive, I occurs in liquor kalii iodide with iodine-+I2= I3 -Become
Change closely related, I—Ion and I3 —Ion is in the metal surface to be measured of energization 2 I of release electronics—-2e=I2、2I3 --6e=3I2, have
Conducive to PbI2Quickly generate.
Description of the drawings
Fig. 1 is the schematic diagram of the detection circuit of the present invention.
Specific implementation mode
In order to make technical scheme of the present invention be more clear, below in conjunction with attached drawing 1, the present invention is described in detail.
The present invention be in a kind of quick detection metal whether leaded method, it is characterised in that include the following steps：
Step 1：Configure test solution
I2 is dissolved in KI solution and constitutes test solution, wherein the content of KI is 50g/L, and the content of I2 is 8g/L；
Step 2：Make test paper
The test solution is dipped with a piece of white paper, the test paper 1 of moistening is made；
Step 3：Connect circuit
The test paper 1 is covered in 2 surface of metal to be detected on one side, metal 2 to be detected is connected to 12V DC by conducting wire
No lead metal 3 is covered in the another side of test paper 1 by the anode of power supply, will be connected to 12V DC electricity by conducting wire without lead metal 3
The cathode in source；
Step 4：It detects whether leaded in metal to be detected
Power on, be powered at least one second, close power supply, test paper 1 is taken out, if test paper 1 covers the one side of metal 2 to be detected
Become yellow, then contain lead in the metal to be detected 2, if test paper 1 cover metal 2 to be detected there is no yellow shape on one side
At then without lead in the metal to be detected 2.
Can also be other to have preferably, the white paper is that thickness is greater than or equal to 1 millimeter of filter paper or blotting paper
The paper of certain water imbibition, it is therefore an objective to can absorb test solution and it is conductive and cannot short circuit, the too thin easy short circuit of the scraps of paper.Without lead metal 3
Can also be other inert metals for stainless steel substrates or cobalt sheet metal or platinum piece or gold plaque etc., it is therefore an objective to will not be with examination
Liquid reacts.The area of the test paper 1 is greater than or equal to 2 mm2, in practical applications, if the surface of metal to be detected 2
It is not very little, the area of the test paper 1 is preferably selected 25~100 mm2.When 2 surface of metal to be detected is by severe oxidation, inspection
Need to wash the oxidation film on 2 surface of metal to be detected before survey.
It is a kind of for quickly detect in metal whether leaded test paper, the test paper 1 includes white paper and immerses the white
The thickness of test solution in paper, the white paper is greater than or equal to 1 millimeter；The test solution is Wagner's reagent, and wherein KI's contains
Amount is 50g/L, and the content of I2 is 8g/L.Preferably, the white paper is the filter paper of white or the blotting paper of white, also may be used
To be other white paper for having certain water imbibition, it is therefore an objective to can absorb test solution and it is conductive and will not short circuit, the scraps of paper are too thin to be easy
Short circuit.The area of the test paper 1 is greater than or equal to 2 mm2, area is too small to be not easy to find out color change, is also inconvenient to take.
The test paper 1 should keep moistening when in use, and usually storage should be sealed in the container being protected from light.The application method of the test paper 1 is same
In above-mentioned quick detection metal whether leaded method, repeat no more.
Claims (6)
1. in a kind of quick detection metal whether leaded method, it is characterised in that include the following steps：
Step 1：Configure test solution
I2 is dissolved in KI solution and constitutes test solution, wherein the content of KI is 50g/L, and the content of I2 is 8g/L；
Step 2：Make test paper
The test solution is dipped with a piece of white paper, the test paper of moistening is made（1）；
Step 3：Connect circuit
By the test paper（1）Be covered in metal to be detected on one side（2）Surface, by metal to be detected（2）It is connected to by conducting wire
The anode of 12V DC power supply, will be without lead metal（3）It is covered in test paper（1）Another side, will be without lead metal（3）Connected by conducting wire
It is connected to the cathode of 12V DC power supply；
Step 4：It detects whether leaded in metal to be detected
Power on, be powered at least one second, close power supply, takes out test paper（1）If test paper（1）Cover metal to be detected（2）
Become yellow on one side, then the metal to be detected（2）In contain lead, if test paper（1）Cover metal to be detected（2）One side
There is no yellow to be formed, then the metal to be detected（2）In be free of lead.
2. in quick detection metal according to claim 1 whether leaded method, it is characterised in that：It is described white paper be
Thickness is greater than or equal to 1 millimeter of filter paper or blotting paper.
3. in quick detection metal according to claim 2 whether leaded method, it is characterised in that：Without lead metal（3）
For stainless steel substrates or cobalt sheet metal or platinum piece or gold plaque.
4. in the quick detection metal according to any claim in claims 1 to 3 whether leaded method, feature
It is：The test paper（1）Area be greater than or equal to 2 mm2。
5. it is a kind of for quickly detect metal in whether leaded test paper, the test paper（1）Including white paper and immerse the white
Test solution in paper, it is characterised in that：The thickness of the white paper is greater than or equal to 1 millimeter；The test solution is that iodine-potassium iodide is molten
Liquid, the wherein content of KI are 50g/L, and the content of I2 is 8g/L.
6. it is according to claim 5 for quickly detect metal in whether leaded test paper, it is characterised in that：The white
Paper is the filter paper of white or the blotting paper of white, the test paper（1）Area be greater than or equal to 2 mm2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810525859.2A CN108627509A (en) | 2018-05-28 | 2018-05-28 | In a kind of quick detection metal whether leaded method and its used test paper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810525859.2A CN108627509A (en) | 2018-05-28 | 2018-05-28 | In a kind of quick detection metal whether leaded method and its used test paper |
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| CN108627509A true CN108627509A (en) | 2018-10-09 |
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| CN201810525859.2A Pending CN108627509A (en) | 2018-05-28 | 2018-05-28 | In a kind of quick detection metal whether leaded method and its used test paper |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3893808A (en) * | 1973-06-22 | 1975-07-08 | Standard Oil Co | Method and paper test strip for determining low levels of lead in hydrocarbon fuels |
| CN87102703A (en) * | 1987-04-09 | 1988-10-19 | 汉江工具厂 | The quick qualitative analysis method of metal molybdenum |
| CN101936884A (en) * | 2010-06-23 | 2011-01-05 | 四川农业大学 | Method for determining total lead and copper content of soil |
| CN104990919A (en) * | 2015-07-24 | 2015-10-21 | 天津凯英科技发展有限公司 | Method for quickly detecting heavy metal content, test paper, and preparation method thereof |
-
2018
- 2018-05-28 CN CN201810525859.2A patent/CN108627509A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3893808A (en) * | 1973-06-22 | 1975-07-08 | Standard Oil Co | Method and paper test strip for determining low levels of lead in hydrocarbon fuels |
| CN87102703A (en) * | 1987-04-09 | 1988-10-19 | 汉江工具厂 | The quick qualitative analysis method of metal molybdenum |
| CN101936884A (en) * | 2010-06-23 | 2011-01-05 | 四川农业大学 | Method for determining total lead and copper content of soil |
| CN104990919A (en) * | 2015-07-24 | 2015-10-21 | 天津凯英科技发展有限公司 | Method for quickly detecting heavy metal content, test paper, and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 吴光先: "《食品卫生检验手册》", 31 December 1965, 人民卫生出版社 * |
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Application publication date: 20181009 |