CN102980867A - Method for measuring nickel content in copper alloy by use of dimethylglyoxime spectrophotometric method - Google Patents
Method for measuring nickel content in copper alloy by use of dimethylglyoxime spectrophotometric method Download PDFInfo
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- CN102980867A CN102980867A CN2012104934124A CN201210493412A CN102980867A CN 102980867 A CN102980867 A CN 102980867A CN 2012104934124 A CN2012104934124 A CN 2012104934124A CN 201210493412 A CN201210493412 A CN 201210493412A CN 102980867 A CN102980867 A CN 102980867A
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Abstract
The invention discloses a method for measuring nickel content in a copper alloy by use of a dimethylglyoxime spectrophotometric method. The method comprises the following steps of: dissolving a copper alloy sample with acid; separating nickel from the sample solution by use of a dimethylglyoxime complex in a pH range from 6.5 to 7.2 of the solution; extracting the complex by use of trichloromethane; and measuring the nickel content by use of the spectrophotometric method. The measured nickel content is less than or equal to 0.50%m/m. According to the invention, by adopting a method of adjusting the consistency of matrix copper content in the sample solution, separating nickel by use of dimethylglyoxime-ethanol and filtering the color development liquid with absorbent cotton, the shortcomings of the GB/T5121.5-2008 method IV are overcome, and the measurement accuracy is guaranteed. The method disclosed by the invention is suitable for measuring nickel content which is not greater than 0.50%m/m in the copper alloy.
Description
Technical field
The present invention relates to the detection technique of nickel amount in the aldary, particularly use the method for nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy.
Background technology
Nickel is one of important alloying element, and the nickel content in copper and the aldary can have influence on the performance of copper and aldary to a great extent, so needs in the industry nickel content in copper and the aldary is measured.The technical scheme of nickel content is that disclosed method four is the dimethylglyoxime spectrophotometric method in the national standard " chemical analysis of nickel amount (GB/T5121.5-2008) in copper and the aldary " in the existing mensuration aldary, the method is by precipitation dimethylglyoxime complex compound nickel to be separated from the ammonia spirit of sample, with this complex compound of chloroform extraction, then evaporate organism, clear up complex compound, measure nickel content with the indirect complexometry of volt-ampere End point indication method at last.The reagent preparation that this method needs has: methenyl choloride, anhydrous sodium sulfate, hydrochloric acid (1+1), superoxol, oxammonium hydrochloride solution are adjusted to pH7, complex solution, dimethylglyoxime methane solution and nickel standard solution etc. with ammonia solution, test apparatus mainly is spectrophotometer, takes a sample according to the operating conditions of ISO/R 1811 regulations.There is following point in this method: at first, the dimethylglyoxime methane solution (10g/L) that needs in the test to use is difficult for preparation; Secondly, because the matrix copper content in all kinds of aldarys has difference, when the complex compound that forms with chloroform extraction nickel and dimethylglyoxime makes it to separate with matrix copper, easily cause error during because of the inconsistent mensuration nickel of absorbing copper, the accuracy of measuring when particularly measuring low content nickel is poorer; In addition, from the 25mL conical flask, directly nitrite ion is moved in the cuvette in the test, may bring anhydrous sodium sulfate into or bring vaseline into and cause error.
Therefore, the method for nickel amount or not ideal enough in the existing usefulness dimethylglyoxime Spectrophotometric Determination of Copper alloy.
Summary of the invention
The objective of the invention is for overcoming the deficiencies in the prior art, a kind of method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy is provided, solve the technical matters that the nickel amount is particularly hanged down nickel amount Accurate Determining in the aldary.
For realizing purpose of the present invention, a kind of method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy of the present invention, wherein, during the nickel amount, matrix copper content is consistent in the adjusting sample solution in dimethylglyoxime Spectrophotometric Determination of Copper alloy; With dimethylglyoxime-separation of ethanol nickel; Filter nitrite ion with absorbent cotton.More than 3 be the core content of technical scheme of the present invention, also be the innovative point that the present invention distinguishes prior art.
Further, the above-mentioned method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy, wherein, the nickel amount of described nitrite ion in the Spectrophotometric Determination of Copper alloy.Other routine techniques means of described spectrophotometric method are consistent with the statement of corresponding contents among the GB/T5121.5-2008.
Further, the above-mentioned method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy, wherein, matrix copper content unanimously refers to estimate first the content of copper in the test portion in the described adjusting sample solution, then is added to not nickeliferous fine copper that the copper amount reaches 1g in the test portion.
Further, the above-mentioned method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy, wherein, described sample solution, it is the beaker of the test portion behind the adding fine copper being put into 200mL, add 20mL hydrochloric acid, and gradation adds the 10mL superoxol dissolving that concentration is ρ 1.10g/mL in a small amount; After test portion dissolved fully, heating was boiled solution and is continued to boil 1min to remove excessive hydrogen peroxide; Be cooled to room temperature, solution changed in the volumetric flask of 500mL, be diluted to scale, mixing, thus prepare out.
Further, the above-mentioned method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy, wherein, described with the nickel in dimethylglyoxime-separation of ethanol sample solution, to pipette sample solution 25mL in the separating funnel of 250mL with transfer pipet, adding concentration is 5mL hydrochloric acid hydroxylammonium solution and the 50mL complex solution of 10g/L, PH=7, and the pH value of inspection, regulator solution is in 6.5～7.2 scopes; Add 3mL and be dissolved in dimethylglyoxime-ethanolic solution formulated in the 100mL absolute ethyl alcohol by taking by weighing the 1g dimethylglyoxime, then vibration 1min pipettes the 20mL methenyl choloride in this solution with transfer pipet, and vibration 40s makes to be separated; With yellow chloroform soln as nitrite ion move into have glass stopper in be equipped with in the 25mL conical flask of 1g anhydrous sodium sulfate, filled in bottle stopper, shake the water of removing in the methenyl choloride.
Further, the above-mentioned method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy, wherein, describedly filter nitrite ion with absorbent cotton, to put absorbent cotton at the funnel of drying, yellow chloroform soln filtration as nitrite ion is moved on in the cuvette of optical length 3cm～5cm, add a cover; At wavelength 365nm place, take methenyl choloride as reference solution, carry out the spectrophotometry of sample chromophoric solution and blank solution, and calculate nickel content with formula.
Further, the above-mentioned method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy, wherein, described complex solution, be to be the 240mL EWNN solution of 100g/L with concentration, concentration is the 90mL sodium hydroxide solution of 40g/L, and concentration is the 480mL sodium acetate solution (CH of 200g/L
3COONa3H
2O) and concentration be the 200mL hypo solution (Na of 200g/L
2S
2O
33H
2O) mixing is prepared out.
Further, the above-mentioned method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy, wherein, described method also need be drawn calibration curve, when calibration curve is drawn, pipettes 100mL nickel standard solution with transfer pipet and forwards in the 500mL volumetric flask, be diluted to scale, mixing; This solution 0mL, 2mL, 5mL, 10mL, 15mL and 25mL are transferred to respectively in the 500mL volumetric flask, and the solution of pressing the method dissolving 1g fine copper of sample dissolving adds, and is diluted to scale and mixing; Pipette sample solution 25mL in the 250mL separating funnel with transfer pipet, press the method for Specimen Determination and measure spectrophotometric, and the drawing standard curve.
Further, the above-mentioned method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy, wherein, described nickel standard solution prepares by the following method: it is in the nitric acid of ρ 1.38g/mL in 10mL concentration that dissolving nickel content is not less than 99.9% 1.000g pure nickel, boil and remove nitrogen oxides, solution is evaporated to thick pulpous state, and cooling is diluted with water to 1L.
Again further, the above-mentioned method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy, wherein, the computing formula of described mensuration nickel amount is as follows:
ω(N
i)=m
1/10m
0
In the formula:
m
0------divides the test portion quality of getting in the liquid, and unit is gram;
m
1------divides the nickel amount that obtains after the deduction blank in the liquid of getting, and unit is milligram.
Principle of the present invention is: the aldary sample in the scope of solution PH 6.5～7.2, from sample solution separates nickel by the dimethylglyoxime complex compound with the acid dissolving, with this complex compound of chloroform extraction, with spectrophotometry nickel content.Measure nickel content range≤0.50%m/m.The present invention adopts in the adjusting sample solution matrix copper content consistent, and with dimethylglyoxime-separation of ethanol nickel, the method with absorbent cotton filters nitrite ion has overcome the shortcoming in the GB/T5121.5-2008 method four, has guaranteed the accuracy of measuring.Be applicable to measure the nickel content that is not more than 0.50%m/m in the aldary.
Owing to adopted technical scheme of the present invention, in with dimethylglyoxime Spectrophotometric Determination of Copper alloy during the nickel amount, matrix copper content is consistent in the adjusting sample solution, with dimethylglyoxime-separation of ethanol nickel, filter nitrite ion with absorbent cotton, thereby overcome the matrix copper content that the dimethylglyoxime methane solution (10g/L) that exists in method four-dimethylglyoxime spectrophotometric method in the prior art (GB/T5121.5-2008) is difficult in preparation and all kinds of aldary difference is arranged, when the complex compound that forms with chloroform extraction nickel and dimethylglyoxime makes it to separate with matrix copper, the inconsistent mensuration nickel of absorbing copper causes the problem of error, and prior art directly moves into nitrite ion in the cuvette from the 25mL conical flask, may bring anhydrous sodium sulfate into or bring the problem that vaseline causes error into, thereby guarantee to analyze accuracy and the precision of nickel amount in the aldary.For production control, scientific research provide the data of chemical element accurately, guarantee product quality, the direction that directs study, be worthy to be popularized.
Embodiment
The present invention is described in further detail below in conjunction with embodiment.
Specimen test of the present invention is done blank test simultaneously.
Specimen test: take by weighing sample 1g (being accurate to 0.0001g), estimate the content of copper in the test portion, be added to fine copper (without nickel) and make in the test portion that the copper amount reaches 1g in the test portion, then will add test portion behind the copper and put into the beaker of 200mL, add 20mL hydrochloric acid (1+1), and gradation adds 10mL hydrogen peroxide (ρ 1.10g/mL) solution dissolving in a small amount, cooling until intense reaction stop.After test portion dissolved fully, heating was boiled solution and is continued to boil 1min to remove excessive hydrogen peroxide, is cooled to room temperature, solution is changed in the volumetric flask of 500mL.Be diluted with water to scale, mixing.
Pipette sample solution 25mL in the 250mL separating funnel with transfer pipet, add 5mL hydrochloric acid hydroxylammonium solution (10g/L, PH=7) and 50mL complex solution, the pH value of inspection, regulator solution is 6.5～7.2.Add 3mL dimethylglyoxime-ethanolic solution (10g/L takes by weighing the 1g dimethylglyoxime and is dissolved in the 100mL absolute ethyl alcohol), then vibration 1min pipettes the 20mL methenyl choloride in this solution with transfer pipet, and vibration 40s makes to be separated.Yellow chloroform soln is moved in the 25mL conical flask that glass stopper is arranged (in the 1g anhydrous sodium sulfate is housed), filled in bottle stopper, shake the water of removing in the methenyl choloride.
Funnel in drying is put absorbent cotton, yellow chloroform soln (nitrite ion) is filtered move on in the cuvette of optical length 3cm～5cm, adds a cover.At wavelength 365nm place, take methenyl choloride as reference solution, carry out the spectrophotometry of sample chromophoric solution and blank solution.Calculate nickel content with formula.
The computing formula of nickel amount (massfraction %) is as follows:
ω(Ni)=m
1/10m
0
In the formula:
m
0------divides the test portion quality of getting in the liquid, and unit is gram (g);
m
1------divides the nickel amount that obtains after the deduction blank in the liquid of getting, and unit is milligram (mg).
Calibration curve is drawn: pipette 100mL nickel standard solution (1g/L) with transfer pipet and forward in the 500mL volumetric flask, be diluted to scale, mixing.This solution 0mL, 2mL, 5mL, 10mL, 15mL and 25mL are transferred to respectively in the 500mL volumetric flask, and the solution of pressing the method dissolving 1g fine copper (without nickel) of sample dissolving adds, and is diluted to scale and mixing.Pipette sample solution 25mL in the 250mL separating funnel with transfer pipet, press the method for Specimen Determination and measure spectrophotometric, and the drawing standard curve.
Certainly, more than be concrete exemplary applications of the present invention, the present invention does not find replacement scheme temporarily, adopts the technical scheme that is equal to replacement or equivalent transformation formation in every case, all drops within the protection domain of the presently claimed invention.
Claims (10)
1. method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy is characterized in that: during the nickel amount, matrix copper content is consistent in the adjusting sample solution in dimethylglyoxime Spectrophotometric Determination of Copper alloy; With dimethylglyoxime-separation of ethanol nickel; Filter nitrite ion with absorbent cotton.
2. the method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy according to claim 1 is characterized in that: the nickel amount of described nitrite ion in the Spectrophotometric Determination of Copper alloy.
3. the method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy according to claim 1, it is characterized in that: matrix copper content unanimously refers to estimate first the content of copper in the test portion in the described adjusting sample solution, then is added to not nickeliferous fine copper that the copper amount reaches 1g in the test portion.
4. the method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy according to claim 3, it is characterized in that: described sample solution, it is the beaker of the test portion behind the adding fine copper being put into 200mL, add 20mL hydrochloric acid, and gradation adds the 10mL superoxol dissolving that concentration is ρ 1.10g/mL in a small amount; After test portion dissolved fully, heating was boiled solution and is continued to boil 1min to remove excessive hydrogen peroxide; Be cooled to room temperature, solution changed in the volumetric flask of 500mL, be diluted to scale, mixing, thus prepare out.
5. the method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy according to claim 1, it is characterized in that: described with the nickel in dimethylglyoxime-separation of ethanol sample solution, to pipette sample solution 25mL in the separating funnel of 250mL with transfer pipet, adding concentration is 5mL hydrochloric acid hydroxylammonium solution and the 50mL complex solution of 10g/L, PH=7, and the pH value of inspection, regulator solution is in 6.5～7.2 scopes; Add 3mL and be dissolved in dimethylglyoxime-ethanolic solution formulated in the 100mL absolute ethyl alcohol by taking by weighing the 1g dimethylglyoxime, then vibration 1min pipettes the 20mL methenyl choloride in this solution with transfer pipet, and vibration 40s makes to be separated; With yellow chloroform soln as nitrite ion move into have glass stopper in be equipped with in the 25mL conical flask of 1g anhydrous sodium sulfate, filled in bottle stopper, shake the water of removing in the methenyl choloride.
6. the method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy according to claim 1, it is characterized in that: describedly filter nitrite ion with absorbent cotton, to put absorbent cotton at the funnel of drying, yellow chloroform soln filtration as nitrite ion is moved on in the cuvette of optical length 3cm～5cm, add a cover; At wavelength 365nm place, take methenyl choloride as reference solution, carry out the spectrophotometry of sample chromophoric solution and blank solution, and calculate nickel content with formula.
7. the method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy according to claim 5, it is characterized in that: described complex solution, to be the 240mL EWNN solution of 100g/L with concentration, concentration is the 90mL sodium hydroxide solution of 40g/L, and concentration is the 480mL sodium acetate solution (CH of 200g/L
3COONa3H
2O) and concentration be the 200mL hypo solution (Na of 200g/L
2S
2O
33H
2O) mixing is prepared out.
8. the method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy according to claim 1, it is characterized in that: described method also need be drawn calibration curve, when calibration curve is drawn, pipettes 100mL nickel standard solution with transfer pipet and forwards in the 500mL volumetric flask, be diluted to scale, mixing; This solution 0mL, 2mL, 5mL, 10mL, 15mL and 25mL are transferred to respectively in the 500mL volumetric flask, and the solution of pressing the method dissolving 1g fine copper of sample dissolving adds, and is diluted to scale and mixing; Pipette sample solution 25mL in the 250mL separating funnel with transfer pipet, press the method for Specimen Determination and measure spectrophotometric, and the drawing standard curve.
9. the method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy according to claim 1, it is characterized in that: described nickel standard solution prepares by the following method: it is in the nitric acid of ρ 1.38g/mL in 10mL concentration that dissolving nickel content is not less than 99.9% 1.000g pure nickel, boil and remove nitrogen oxides, solution is evaporated to thick pulpous state, cooling is diluted with water to 1L.
10. the method with nickel amount in the dimethylglyoxime Spectrophotometric Determination of Copper alloy according to claim 6, it is characterized in that: the computing formula of described mensuration nickel amount is as follows:
ω(N
i)=m
1/10m
0
In the formula:
m
0------divides the test portion quality of getting in the liquid, and unit is gram;
m
1------divides the nickel amount that obtains after the deduction blank in the liquid of getting, and unit is milligram.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007887A (en) * | 2017-11-17 | 2018-05-08 | 金川集团股份有限公司 | A kind of method for measuring purity of carbonyl nickel in the carbonyl nickel containing carbonyl iron |
| CN109959628A (en) * | 2019-04-29 | 2019-07-02 | 中南大学 | A kind of zinc solution concentration impurity ion detection method merged based on pole-spectrum |
| CN112557316A (en) * | 2020-11-20 | 2021-03-26 | 上海仪电科学仪器股份有限公司 | Method for measuring content of nickel ions in water |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102374984A (en) * | 2010-08-10 | 2012-03-14 | 北京北机机电工业有限责任公司 | Method for measuring nickel content in low alloy steel by spectrophotometry |
-
2012
- 2012-11-28 CN CN2012104934124A patent/CN102980867A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102374984A (en) * | 2010-08-10 | 2012-03-14 | 北京北机机电工业有限责任公司 | Method for measuring nickel content in low alloy steel by spectrophotometry |
Non-Patent Citations (4)
| Title |
|---|
| A. M. MITCHELL 等: "Colorimetric Determination of Nickel with Dimethylglyoxime", 《INDUSTRIAL AND ENGINEERING CHEMISTRY》 * |
| 中华人民共和国国家质量监督检验检疫总局 等发布: "《中华人民共和国国家标准GB/T5121.5-2008 铜及铜合金化学分析方法第5部分：镍含量的测定》", 17 June 2008 * |
| 王淑琴 等: "电镀废水中镍的萃取分光光度法测定", 《电镀与环保》 * |
| 祝天林 等主编: "《商检技术》", 30 September 2008, 哈尔滨地图出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007887A (en) * | 2017-11-17 | 2018-05-08 | 金川集团股份有限公司 | A kind of method for measuring purity of carbonyl nickel in the carbonyl nickel containing carbonyl iron |
| CN109959628A (en) * | 2019-04-29 | 2019-07-02 | 中南大学 | A kind of zinc solution concentration impurity ion detection method merged based on pole-spectrum |
| CN112557316A (en) * | 2020-11-20 | 2021-03-26 | 上海仪电科学仪器股份有限公司 | Method for measuring content of nickel ions in water |
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Application publication date: 20130320 |