CN105928894B - A kind of rapid assay methods of stainless steel middle rare earth total amount - Google Patents
A kind of rapid assay methods of stainless steel middle rare earth total amount Download PDFInfo
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- 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
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Abstract
A kind of rapid assay methods of stainless steel middle rare earth total amount, it is related to the quantitative analysis tech field of analytical chemistry, specifically prepared comprising sample solution, sample assay method, the drafting of working curve, as a result calculate and etc., this method need not use extraction, back extraction, the cumbersome operation such as precipitation in matrix detaches sample matrices with rare earth element, rapid and accurate determination is carried out to stainless steel middle rare earth total amount in can be realized on economical and practical visible spectrophotometer, with stronger operability and practicability, convenient for promoting, it is of great significance to the research and development and production of type of stainless steel.
Description
Technical field
The present invention relates to the quantitative analysis tech fields of analytical chemistry, and in particular to a kind of stainless steel middle rare earth total amount it is fast
Fast assay method.
Background technology
Rare earth is stronger deoxidation, desulfurizing agent, is referred to as " vitamin " of steel, effect of the rare earth element in stainless steel
Although be only last century early fifties just it has been reported that research work in this respect advance by leaps and bounds.Rare earth member
Element have the effects that cleaning molten steel, it is rotten be mingled with, microalloying, rare earth is added in stainless steel to be the stainless steel quality of raising, opens
Send out one of the effective measures of product new varieties.A certain amount of rare earth is added in stainless steel and may make stainless steel plate and seamless steel pipe
50% or more transverse impact toughness increase, meanwhile, corrosion resistance improves 60% or so, is conducive to the hot-working for improving stainless steel
Property, improve lamellar tearing and hydrogen induced cracking (HIC), effect is very notable.
Rare earth is researched and developed as ingredient indispensable in steel containing rare-earth stainless steel, its Accurate Determining for type of stainless steel
Important reference frame is provided with quality of production Con trolling index, therefore, the Accurate Determining one of the Rare-Earth Content containing rare-earth stainless steel
It is directly analytical chemistry field hot spot.But it since the chemical property of rare earth each element is extremely similar, is not easy to be separated from each other, generally
It is added in stainless steel as a mixture, generally measures its total amount.Currently, the analysis method of stainless steel middle rare earth total amount is mainly
The principle of gravimetric method and photometry etc., gravimetric detemination makes rare earth element be converted into oxalate precipitation, then fluoride precipitation passes through
It crosses calcination and transforms into rare earth oxide and weighed, carry out calculating total amount of rare earth, this method is primarily adapted for use in measurement rare earth
The higher sample of constituent content；And stainless steel Rare Earth Element Contents are relatively low, are widely used in its stainless steel middle rare earth and always measure
Fixed is photometry, such as GB/T 223.49-94《Steel and alloy analysis method extraction component-chlorophosphonazo mA light splitting
Photometry measures total amount of rare earth》The methods of, this method detaches iron, pH when pH is about 2, with acetylacetone,2,4-pentanedione-chloroform extraction
When being 5.5, in the presence of ammonium thiocyanate and sulfosalicylic acid, detached with PMBP- benzene extracting rare-earth elements with other coexistence elements,
Then it is stripped again with dilute hydrochloric acid, chlorophosphonazo mA generates blue complex with rare earth, is surveyed at spectrophotometer wavelength 670nm
Measure its absorbance.Although this method accuracy is high, in analytic process, extract repeatedly, process is lengthy and tedious, is not easy to grasp, analysis
Period is long.With being gradually shortened for current scientific and technological R&D cycle, the demand to quickly detecting is further strong.If using national standard
Not only analytical cycle is long to measure the total amount of rare earth in stainless steel by GB/T223.49, and operating procedure those skilled in the art are difficult to slap
It holds, and uses acetylacetone,2,4-pentanedione-chloroform in the process, the volatile organic reagent such as PMBP- benzene has larger harm to human body,
And serious environmental pollution can be caused, therefore, develops a kind of accurate, fast and convenient stainless steel middle rare earth total amount measurement side
Method is particularly important.
Currently, the total amount of rare earth measured in carbon steel, low-alloy steel and cast iron has more report, but due to micro in stainless steel
Rare earth element accurately analysis there are many disturbing factors, rarely seen document reports.Through consulting literatures, in addition to GB/T 223.49-94
Outside, a kind of quick measurement of stainless steel middle rare earth total amount disclosed in Anhui chemical industry periodical total the 4th phase of nineteen ninety-five 81st phase makes in literary
With the molten sample of chloroazotic acid, perchloric acid smoked is added, divides and takes test solution, but utilizes methylisobutylketone organic solvent extraction and separation chromium, surveys
It is similar with GB223.49-94 to determine the lengthy and tedious degree of step.Therefore, research is quickly measured to stainless steel middle rare earth total amount to demand perfection urgently,
A kind of method of quick measurement stainless steel middle rare earth total amount is developed, the research and development and production to type of stainless steel have important meaning
Justice.
Invention content
The present invention is and big in order to overcome existing stainless steel middle rare earth Determination of Gross the troublesome operations such as to need to extract repeatedly
The problems such as mostly using volatile organic reagent, causing environmental pollution provides a kind of quick measurement side of stainless steel middle rare earth total amount
Method.
Used technical solution is the present invention in order to solve the above problem：A kind of quick measurement of stainless steel middle rare earth total amount
Method includes the following steps：
Step 1: a, weighing 0.1 ~ 0.5g stainless steel samples to be measured, the nitric acid that 3 ~ 5mL mass fractions are 65 ~ 68% is added
The hydrochloric acid for being 35 ~ 40% with 5 ~ 20mL mass fractions clears up stainless steel sample, in being heated to stainless steel on 150 ~ 250 DEG C of electric hot plates
Sample is completely dissolved, and obtains sample solution A；
B, the perchloric acid that 3 ~ 10mL mass fractions are 60 ~ 75% is added into sample solution A, continues at 300 ~ 400 DEG C of electric heating
It is heated to emitting perchloric acid cigarette on plate, ensures fully dissolving, the hydrochloric acid that 1 ~ 3mL mass fractions are 35 ~ 40% is then added and waves chromium to nothing
Perchloric acid cigarette and yellow cigarette are emerged；It repeats to emerge without tobacco in the step to sample solution A, makes the chromium in stainless steel sample with chlorine
Change chromyl form volatilization, stops heating and cooling；
C, deionized water is continuously added, sample solution B is obtained；Then, the ammonium hydroxide that mass fraction is 5 ~ 15% is added dropwise, adjusts
The pH of sample solution B is to there is Fe（OH）3Precipitation adjusts the pH value of sample solution B to 3.0；Then, 2 ~ 10mL mass point is added
The nitric acid that the sulfuric acid and 1 ~ 5mL mass fractions that number is 95 ~ 98% are 65 ~ 68%, adjust the pH value of sample solution B to azo chlorine phosphorus
III reaches best complexing；0.5 ~ 3g ammonium persulfates are added and aoxidize the rare earth element in stainless steel sample, continue to boil sample solution
B removes extra ammonium persulfate until emerging without minute bubbles in sample solution B, cooling, and constant volume obtains in 100mL volumetric flasks
To sample solution C；
Step 2: drawing 5 ~ 10mL sample solutions C in 25mL volumetric flasks, it is 5 ~ 20% to sequentially add 3 ~ 5mL mass fractions
Oxalic acid solution, after shaking up be added 3 ~ 5mL mass fractions be 0.01 ~ 0.1% azo chlorine III-ethanol solution of phosphorus, then be added go
Ionized water shakes up to volumetric flask graduation mark, obtains sample solution D, spare；
Step 3: using cuvette at 650 ~ 700nm wavelength, sample solution D is taken, extinction is read on spectrophotometer
Degree；
Step 4: weighing the serial steel standard sample of more parts of different contents and a steel standard for being free of rare earth respectively
Sample, steel standard sample Rare-Earth Content is the different numerical value being distributed in 0.00 ~ 0.084% range, according to above-mentioned steps one
It carries out preparing standard solution and blank to the identical operating procedure of step 3, the absorbance value of standard solution to be measured is obtained, with dilute
Native total amount is abscissa, and absorbance is ordinate, drawing curve；
Step 5: the absorbance measured according to step 3, checks in sample solution D's on the working curve that step 4 is drawn
Content of rare earthw, unit %；According to formula, calculate stainless steel sample middle rare earth
The mass fraction of total amount, is indicated with RE；Wherein,xFor sample and the nominal mass of standard sample, unit g；mIt is single for sample size
Position is g.
In the step three of the present invention, using 1 ~ 3cm cuvettes.
In the step four of the present invention, the content of rare earth in the serial steel standard sample of different content is respectively 0.00%,
0.0065%, 0.014%, 0.025% and 0.084%.
Using technical solution as described above, the present invention has superiority as described below：The present invention is by stainless steel sample
Middle whole rare earth element is oxidizing to highest valence state, may be implemented rapidly and accurately to measure stainless steel middle rare earth total amount, specific to wrap
Containing sample solution preparation, sample assay method, the drafting of working curve, result calculate and etc., this method need not use extraction,
The cumbersome operation such as back extraction, precipitation in matrix detaches sample matrices with rare earth element, in economical and practical vis spectroscopy
It can be realized on photometer and rapid and accurate determination carried out to stainless steel middle rare earth total amount, there is stronger operability and practicality
Property, convenient for promoting, it is of great significance to the research and development and production of type of stainless steel.
Description of the drawings
Fig. 1 is the working curve of the total amount of rare earth and absorbance drawn in embodiment 1；
Fig. 2 is the working curve of the total amount of rare earth and absorbance drawn in embodiment 3.
Specific implementation mode
Technological means, creation characteristic and the purpose reached to make the present invention realize are easy to understand, and are explained further below
The present invention is stated, but scope of the present invention is not limited to the range described in specific implementation mode.
A kind of rapid assay methods of stainless steel middle rare earth total amount, include the following steps：Step 1: a, weighing 0.1 ~ 0.5g
The nitric acid that 3 ~ 5mL mass fractions are 65 ~ 68% and the salt that 5 ~ 20mL mass fractions are 35 ~ 40% is added in stainless steel sample to be measured
Acid clears up stainless steel sample, is completely dissolved in being heated to stainless steel sample on 150 ~ 250 DEG C of electric hot plates, obtains sample solution A；
B, the perchloric acid that 3 ~ 10mL mass fractions are 60 ~ 75% is added into sample solution A, continues at 300 ~ 400 DEG C of electric heating
It is heated to emitting perchloric acid cigarette on plate, ensures fully dissolving, the hydrochloric acid that 1 ~ 3mL mass fractions are 35 ~ 40% is then added and waves chromium to nothing
Perchloric acid cigarette and yellow cigarette are emerged；It sequentially adds perchloric acid and hydrochloric acid continues to repeat step b, until being emitted without tobacco in sample solution A
Go out, which is used to make chromium and hydrochloric acid generation chlorochromic anhydride volatilization in stainless steel, removes chromium, stops heating and cooling；
C, deionized water is continuously added, sample solution B is obtained；Then, the ammonium hydroxide that mass fraction is 5 ~ 15% is added dropwise, adjusts
The pH of sample solution B is to there is Fe（OH）3Precipitation, the step are used to adjust the pH value of solution to 3 or so, are convenient for later stage acid adding straight
Connect control solution acidity；Then, the sulfuric acid and 1 ~ 5mL mass fractions that addition 2 ~ 10mL mass fractions are 95 ~ 98% are 65 ~ 68%
After nitric acid dissolving precipitation, which is complexed optimum value for adjusting pH value to rare earth and azo chlorine phosphorus III；0.5 ~ 3g over cures are added
Sour ammonium continues to boil sample solution B, until when emerging without minute bubbles in sample solution B, ammonium persulfate decomposes complete, cooling, should
Ammonium persulfate is added for the rare earth element in oxidation sample in step, and no minute bubbles are emerged, and illustrate that extra ammonium persulfate has removed；
Constant volume obtains sample solution C in 100mL volumetric flasks；
Step 2: drawing 5 ~ 10mL sample solutions C in 25mL volumetric flasks, it is 5 ~ 20% to sequentially add 3 ~ 5mL mass fractions
Oxalic acid solution, after shaking up be added 3 ~ 5mL mass fractions be 0.01 ~ 0.1% azo chlorine III-ethanol solution of phosphorus, for keeping molten
Liquid is stablized, and Rare-earth Element Dy result stability is improved；In azo chlorine III-ethanol solution of phosphorus, the mass fraction of ethyl alcohol is 40 ~
60%；Then deionized water is added to volumetric flask graduation mark, shakes up, obtains sample solution D, it is spare；
Step 3: using 1 ~ 3cm cuvettes at 650 ~ 700nm wavelength, sample solution D is taken, is read on spectrophotometer
Take absorbance；
Step 4: weighing the serial steel standard sample of more parts of different contents and a steel standard for being free of rare earth respectively
Sample, steel standard sample Rare-Earth Content is the different numerical value being distributed in 0.00 ~ 0.084% range, according to above-mentioned steps one
It carries out preparing standard solution and blank to the identical operating procedure of step 3, the absorbance value of standard solution to be measured is obtained, with dilute
Native total amount is abscissa, and absorbance is ordinate, drawing curve；
Step 5: the absorbance measured according to step 3, checks in sample solution D's on the working curve that step 4 is drawn
Content of rare earthw, unit %；According to formula, calculate stainless steel sample middle rare earth
The mass fraction of total amount, is indicated with RE；Wherein,xFor sample and the nominal mass of standard sample, unit g；mIt is single for sample size
Position is g.
The present invention can be explained in more detail by the following examples, but the invention is not limited in following implementations
Example；In an embodiment of the present invention, instrument is 721 type spectrophotometer of Shanghai third instrument plant.The present invention only with 0.1 ~
In practical application, the assay method of the present invention may be used in the assay method of the stainless steel sample description present invention to be measured 0.5g
Each parameter is expanded or shunk by same ratio.
Embodiment 1
A kind of rapid assay methods of stainless steel middle rare earth total amount, include the following steps：
Step 1: prepared by sample solution
It is that the stainless steel sample A of 0.2g are put into conical flask to weigh 6 parts of nominal mass respectively, and it is 68% that 5mL mass fractions, which are added,
Nitric acid and 15mL mass fractions be 40% hydrochloric acid, on 250 DEG C of electric hot plates dissolve by heating after, be added 5mL mass fractions be
75% perchloric acid continues on 400 DEG C of electric hot plates and is heated to emitting perchloric acid cigarette, and 1mL mass fractions then are added along bottle wall by several times
It waves chromium to no yellow cigarette for 40% hydrochloric acid and emerges, repeat that the perchloric acid that 5mL mass fractions are 75% is added, continue at 400 DEG C of electricity
It is heated to emitting perchloric acid cigarette on hot plate, the hydrochloric acid that 1mL mass fractions are 40% then, which is added, along bottle wall by several times waves chromium to no yellow cigarette
It emerges；Wait for that solution is slightly cold, the ammonium hydroxide that use quality score is 15% adjusts the pH of solution to just there is ferric hydroxide precipitate；So
The sulfuric acid that 2mL mass fractions are 98% and the nitric acid dissolving precipitation that 1mL mass fractions are 68% are added afterwards, 0.5g over cures are then added
Sour ammonium continues to boil solution until ammonium persulfate decomposition completely, removes cooling, constant volume is in 100mL volumetric flasks.
Step 2: sample measures
The above-mentioned constant volume solution of 10mL is drawn in 25mL volumetric flasks, the oxalic acid that 5mL mass fractions are 10% is added, after shaking up,
Chlorophosphonazo Ⅲ-ethanol solution that 5mL mass fractions are 0.1% is added, is diluted with water to scale, shakes up to be measured.In 680nm waves
Strong point uses 3cm cuvettes, and the standard sample solution without rare earth is taken to read absorbance on spectrophotometer as blank.
Step 3: working curve is drawn
The use of contain total amount of rare earth is respectively 0.00%, 0.0065%, 0.014%, 0.025%, 0.084% serial steel mark
Quasi- sample and steel standard sample without rare earth carry out preparing blank and series standard according to above-mentioned sample solution preparation process
Then solution measures its respective absorbance according to step 2 sample assay method, the results are shown in Table 1, take the total amount of rare earth to be respectively
0.00%, 0.0065%, 0.014%, 0.025%, 0.084% steel standard sample, successively be labeled as standard 1-1#, standard 1-2#,
Standard 1-3#, standard 1-4#, standard 1-5#；According to the operation of embodiment 1, obtain in the stainless steel that assay method of the present invention measures
Total amount of rare earth as a result, as shown in table 1 below：
The absorbance measurement result of 1 standard 1-1# of table ~ standard 1-6#
Using total amount of rare earth as abscissa, absorbance is ordinate, drawing curve (see Fig. 1), and gained linear equation isy
=6.3363x-0.00786, R2=0.99913。
Step 4: according to formula, calculate stainless steel sample middle rare earth total amount
Mass fraction the results are shown in Table 2.Wherein, at this point, sample sample weighting amountxIt is 0.2, unit g；wFor according to absorbance Fig. 1 work
Make the corresponding content of rare earth checked on curve, unit %；mFor sample size, unit g.
2 stainless steel sample A measurement results of table
Embodiment 2
A kind of rapid assay methods of stainless steel middle rare earth total amount, include the following steps：
Step 1: prepared by sample solution
According to step in embodiment 1 to stainless steel standard sample（Stainless steel standard sample number into spectrum is：Machine word the 6th, nominally
Quality is 0.2g, total amount of rare earth 0.012%）6 independent detections are carried out respectively, and stainless steel sample in embodiment 2 is carried out respectively
6 independent analyses measure, and carry out statistical disposition to 6 analysis results, measurement result is shown in Table 3.
3 embodiment 2 of table measures
From table 3 it is observed that 6 RSD of the measurement result of method of the present invention（Relative standard deviation）It is 6.4%,
Determination sample differs 0.0015% with standard value, shows that this method has high accuracy and reliability.
Embodiment 3
A kind of rapid assay methods of stainless steel middle rare earth total amount, include the following steps：
Step 1: prepared by sample solution
The stainless steel sample A that 6 parts of nominal mass are 0.500g is accurately weighed respectively to be put into conical flask, and 5mL mass is added
10mL matter is added after being dissolved by heating on 220 DEG C of electric hot plates in the hydrochloric acid that the nitric acid and 20mL mass fractions that score is 68% are 40%
The perchloric acid that score is 75% is measured, continues on 360 DEG C of electric hot plates and is heated to emitting perchloric acid cigarette, 1mL then is added along bottle wall by several times
The hydrochloric acid that mass fraction is 40% waves chromium to no perchloric acid cigarette and emerges, and continues the operation step that perchloric acid and hydrochloric acid is repeatedly added
Suddenly, up to no yellow cigarette is emerged；Wait for that solution is slightly cold, the ammonium hydroxide that use quality score is 12% adjusts the pH of solution to just occurring
White precipitate；Then the sulfuric acid that 4mL mass fractions are 98% and the nitric acid dissolving precipitation that 2mL mass fractions are 68% is added, then
3.0g ammonium persulfates are added, continue to boil solution until ammonium persulfate decomposition completely, removes cooling, constant volume is in 100mL volumetric flasks.
Step 2: sample measures
The above-mentioned constant volume solution of 5mL is drawn in 25mL volumetric flasks, the oxalic acid that 5mL mass fractions are 10% is added, after shaking up,
Chlorophosphonazo Ⅲ-ethanol solution that 5mL mass fractions are 0.1% is added, is diluted with water to scale, shakes up to be measured.In 680nm waves
Strong point uses 2cm cuvettes, and the standard sample solution without rare earth is taken to read absorbance on spectrophotometer as blank.
Step 3: working curve is drawn
The use of contain total amount of rare earth is respectively 0.00%, 0.0065%, 0.014%, 0.025,0.084% serial steel standard sample
Product and steel standard sample without rare earth carry out preparing blank and series standard are molten according to above-mentioned sample solution preparation process
Then liquid measures its respectively absorbance according to step 2 sample assay method, the results are shown in Table 4.In embodiment 3, rare earth is taken respectively
Total amount is 0.00%, 0.0065%, 0.014%, 0.025%, 0.084% steel standard sample, is labeled as standard 3-1#, mark successively
Quasi- 3-2#, standard 3-3#, standard 3-4#, standard 3-5#；According to the operation of embodiment 3, obtain what assay method of the present invention measured
Stainless steel middle rare earth total amount as a result, as shown in table 4 below：
The measurement result of 4 standard 3-1# of table ~ standard 3-6#
Using total amount of rare earth as abscissa, absorbance is ordinate, drawing curve (see Fig. 2), and gained linear equation isy
=7.7523x-0.00099, R2=0.99906。
Step 4: according to formula, calculate stainless steel sample middle rare earth total amount
Mass fraction the results are shown in Table 5.Wherein, at this point, sample sample weighting amount is 0.5g, thenxIt is 0.5, unit g；wFor on working curve
The content of rare earth checked in, unit %；mFor sample size, unit g.
5 stainless steel sample A measurement results of table
From table 2, as can be seen that 6 RSD of measurement result of method of the present invention in table 3 and table 5（Relative standard is inclined
Difference）Respectively 4.8%, 6.4% and 3.2%, determination sample differs 0.0015% with standard value, shows that this method has high accuracy
And reliability.
Part not in the detailed description of the invention is the prior art.
Although having been combined exemplary embodiment has shown and described the present invention, but the invention is not restricted to this.It is not taking off
In the case of spirit and guidance from the present invention, can embodiment be modified and be deformed.
Claims (3)
1. a kind of rapid assay methods of stainless steel middle rare earth total amount, which is characterized in that include the following steps：
Step 1: a, weigh 0.1 ~ 0.5g stainless steel samples to be measured, be added nitric acid that 3 ~ 5mL mass fractions are 65 ~ 68% and 5 ~
The hydrochloric acid that 20mL mass fractions are 35 ~ 40% clears up stainless steel sample, in being heated to stainless steel sample on 150 ~ 250 DEG C of electric hot plates
It is completely dissolved, obtains sample solution A；
B, the perchloric acid that 3 ~ 10mL mass fractions are 60 ~ 75% is added into sample solution A, continues on 300 ~ 400 DEG C of electric hot plates
It is heated to emitting perchloric acid cigarette, ensures fully dissolving, the hydrochloric acid that 1 ~ 3mL mass fractions are 35 ~ 40% is then added and waves chromium to without high chlorine
Acid fume and yellow cigarette are emerged；It repeats to emerge without tobacco in the step to sample solution A, makes the chromium in stainless steel sample with chromium chloride
The form of acyl is volatilized, and heating and cooling are stopped；
C, deionized water is continuously added, sample solution B is obtained；Then, the ammonium hydroxide that mass fraction is 5 ~ 15% is added dropwise, adjusts sample
The pH value of solution B is to there is Fe（OH）3Precipitation adjusts the pH value of sample solution B to 3.0；Then, 2 ~ 10mL mass fractions are added
The nitric acid that sulfuric acid and 1 ~ 5mL mass fractions for 95 ~ 98% are 65 ~ 68%, adjust the pH value of sample solution B to azo chlorine phosphorus III
Reach best complexing；0.5 ~ 3g ammonium persulfates are added and aoxidize the rare earth element in stainless steel sample, continue to boil sample solution B,
Until emerging without minute bubbles in sample solution B, extra ammonium persulfate is removed, cooling, constant volume obtains in 100mL volumetric flasks
Sample solution C；
Step 2: drawing 5 ~ 10mL sample solutions C in 25mL volumetric flasks, the grass that 3 ~ 5mL mass fractions are 5 ~ 20% is sequentially added
Acid solution is added azo chlorine III-ethanol solution of phosphorus that 3 ~ 5mL mass fractions are 0.01 ~ 0.1%, deionization is then added after shaking up
Water shakes up to volumetric flask graduation mark, obtains sample solution D, spare；
Step 3: using cuvette at 650 ~ 700nm wavelength, sample solution D is taken, absorbance is read on spectrophotometer；
Step 4: weighing the serial steel standard sample of more parts of different contents and a steel standard sample for being free of rare earth respectively
Product, steel standard sample Rare-Earth Content are the different numerical value being distributed in 0.00 ~ 0.084% range, according to above-mentioned steps one to
The identical operating procedure of step 3 carries out preparing standard solution and blank, the absorbance value of standard solution to be measured is obtained, with rare earth
Total amount is abscissa, and absorbance is ordinate, drawing curve；
Step 5: the absorbance measured according to step 3, checks in the rare earth of sample solution D on the working curve that step 4 is drawn
Contentw, unit %；According to formula, calculate stainless steel sample middle rare earth total amount
Mass fraction, indicated with RE；Wherein,xFor sample and the nominal mass of standard sample, unit g；mFor sample size, unit is
g。
2. a kind of rapid assay methods of stainless steel middle rare earth total amount according to claim 1, it is characterised in that：Step 3
In, using 1 ~ 3cm cuvettes.
3. a kind of rapid assay methods of stainless steel middle rare earth total amount according to claim 1, it is characterised in that：Step 4
In, the content of rare earth in the serial steel standard sample of different content is respectively 0.00%, 0.0065%, 0.014%, 0.025% and
0.084%。
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| CN101750405A (en) * | 2008-12-15 | 2010-06-23 | 鞍钢股份有限公司 | Method for measuring rare earth component in rare earth magnesium alloy |
| CN101975772A (en) * | 2010-09-14 | 2011-02-16 | 常熟出入境检验检疫局综合技术服务中心 | Method for detecting rare earth elements in steel |
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| CN103439314A (en) * | 2013-08-16 | 2013-12-11 | 中国科学院上海光学精密机械研究所 | Method for testing content of rare-earth active ions in laser glass |
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