CN104777153A - Rapid determination method for molybdenum content and tungsten content in tungsten-containing high-molybdenum product - Google Patents
Rapid determination method for molybdenum content and tungsten content in tungsten-containing high-molybdenum product Download PDFInfo
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Abstract
The invention relates to a rapid determination method for the molybdenum content and the tungsten content in a tungsten-containing high-molybdenum product. With the method of the present invention, the rapid and accurate determination on the molybdenum content and the tungsten content in the tungsten-containing high-molybdenum product can be achieved, particularly the determination on the molybdenum content in the high-molybdenum product can be achieved, the determination method limitation caused by the influence of the tungsten content does not exist, and molybdenum-tungsten separation or complexation and other complicated operations are not required to be performed. According to the present invention, the mother liquor in the high-molybdenum product is diluted so as to substantially improve the accuracy and the stability of the determined result, and the method has broad application prospects.
Description
[technical field]
The present invention relates to the rapid assay methods of a kind of molybdenum and W content, be specifically related to the rapid assay methods of molybdenum and W content in a kind of tungstenic height molybdenum product.
[background technology]
Known, molybdenum-iron, molybdic acid, ammonium molybdate, molybdena contour molybdenum product is the important molybdenum chemical products of a class, is mainly used in steel-making, catalyzer, molybdenum pigment, molybdenum metal product, medicine and other fields.As the basic material of fine chemical product, its molybdenum element content is the key technical index weighing product quality grade, is also the Main Basis of trade in commodities price.
At present, in molybdenum-iron, molybdic acid, ammonium molybdate, molybdena contour molybdenum product, the mensuration of molybdenum content mainly adopts the analytical approachs such as traditional gravimetric method, EDTA titrimetry, ammonium metavanadate titrimetry and ammonium thiocyanate colorimetry.In act.std except the mensuration of molybdenum content in molybdenum-iron has national standard method GB 5059.1-2014, in other high molybdenum products, molybdenum content measures does not have unified standard method, mostly measures with reference to GB5059.1-2014 " the mensuration lead molybdate gravimetric method of molybdenum-iron molybdenum content, ammonium metavanadate titrimetry and oxine gravimetric method " or YS/T 555.1-2009 " the mensuration lead molybdate gravimetric method of molybdenum concntrate chemical analysis method molybdenum amount ".Known, assay method many employings colourimetry (as YS/T 555.8-2009 " the mensuration thiocyanate spectrophotometric method of molybdenum concntrate chemical analysis method tungsten amount ") of tungsten in tungstenic height molybdenum product.Although these traditional chemical analysis method accuracy are high, also have himself shortcoming: sense cycle is long, require also higher to testing staff, use chemical reagent amount large, the waste liquid of generation causes certain harm to environment simultaneously.What is more important molybdenum is extremely similar to the character of tungsten, for tungstenic height molybdenum product, adopts these methods in analytic process, there is serious mutual interference.Although there is the method for separating tungsten in YS/T 555.1-2009 standard, the method is only only applicable to the molybdenum concntrate that W content is not more than 2%, is greater than 2% high molybdenum product to tungstenic amount, and tungsten is difficult to maybe cannot remove to the interference that molybdenum content measures.
Inventor finds through retrieval and inquisition, existing have containing molybdenum in tungsten product and/or tungsten assay method: Chinese patent, notification number is CN203324173U, patent name is the patent of invention of the Analytical system of molybdenum trioxide and/or tungstic acid content in hihg-molybdenum tungsten ore stone, and it adopts a set of complicated melting-dissolver to carry out the mensuration of molybdenum trioxide and/or tungstic acid content in high molybdenum ore.Chinese patent, notification number is CN103076351 A, patent name is the patent of invention of X-ray fluorescence spectra analysis to the assay method containing Mo element in W metallurgy, and it adopts pressed disc method to achieve x-ray fluorescence method to the mensuration containing molybdenum element in W metallurgy.These methods need complicated equipment making or expensive equipment, are difficult to realize for condition general Routine Test Lab.Inductive coupling plasma emission spectrum method is adopted to measure the W content of in molybdenum product 0.005% ~ 1.5% in standard GB/T/T 4325.24-2013 " the mensuration inductive coupling plasma emission spectrum method of molybdenum chemical analysis method the 24th part W content ", the method not only measures tungsten narrow scope, and use hydrofluorite during sample preparation, HF acid resistant device must be adopted to measure, and application has certain limitation." chemical reagent " 2014, the article " inductive coupling plasma emission spectrum method measures tungsten amount in molybdenum trioxide " of 04 adopts hydrogen peroxide, citric acid and the molten sample of ammoniacal liquor, low content tungsten in molybdenum trioxide is measured with ICP, the method can only measure low content tungsten, can not measure molybdenum content simultaneously.
[summary of the invention]
In order to overcome the deficiency existed in background technology, the invention provides the rapid assay methods of molybdenum and W content in a kind of tungstenic height molybdenum product, the present invention can realize measuring molybdenum and W content in tungstenic height molybdenum product rapidly and accurately, particularly in high molybdenum product, molybdenum content measures, no longer there is assay method limitation by W content affects, also the troublesome operation such as the separation of molybdenum tungsten or complexing need not be carried out, the present invention, by the dilution to mother liquor in high molybdenum product, substantially increases the Stability and veracity etc. of testing result.
For realizing goal of the invention as above, the present invention adopts technical scheme as described below:
A rapid assay methods for molybdenum and W content in tungstenic height molybdenum product, concrete grammar is as follows:
One, Specimen eliminating:
1), containing high molybdenum alloy or intermediate alloy:
Take 0.1g ~ 0.5g sample and put into container, first with 5mL ~ 20mL water eluant container wall, adding 5 mL ~ 10mL quality than concentration is the red fuming nitric acid (RFNA) of 65% ~ 68%, heating for dissolving, after cooling, adding 3 mL ~ 10mL quality than concentration is the concentrated sulphuric acid of 95% ~ 98%, continue to be heated to micro-ly to emit sulfuric acid cigarette, after cooling, 200mL ~ 500mL being settled to containing molybdenum solution, shaking up for measuring tungsten;
2), molybdenum chemical products:
Take 0.1 ~ 0.5g sample and put into container, add 5 mL ~ 20mL quality than concentration be 25% ~ 33% strong aqua or concentration be the sodium hydroxide solution of 10g/L ~ 20g/L, low-temperature heat, boil 3min ~ 15min, slightly cold, add 10 mL ~ 50mL water, adding 5 mL ~ 20mL quality than concentration is the red fuming nitric acid (RFNA) of 65% ~ 68%, continue to boil 3min ~ 10min, after cooling, adding 3 mL ~ 10mL quality than concentration is the concentrated sulphuric acid of 95 ~ 98%, continue to boil to solution limpid, after cooling, 200mL ~ 500mL being settled to containing molybdenum solution, shaking up for measuring tungsten;
3), by 1) step or 2) step obtain constant volume solution draw in 5 mL ~ 15mL to 50 mL ~ 100mL volumetric flask, adding 3 mL ~ 10mL quality is the red fuming nitric acid (RFNA) of 65% ~ 68% than concentration, is diluted with water to scale, shake up be used as measure molybdenum;
Two, calibration curve series standard solution preparation:
Connect step, take the High-Purity Molybdenum of 4 ~ 8 parts of different qualities, molybdena standard model is cleared up by first step sample digestion method, or add the commercially available molybdenum standard solution of respective amount, then commercially available tungsten standard solution is added or with tungsten standard substance preparing standard solution, be mixed with molybdenum and W elements is 4 ~ 8 concentration gradient points, and the W content range calibration series of curves solution of the molybdenum content of covering quality mark 10 % ~ 80% and massfraction 0.2% ~ 10%;
Three, Instrument working parameter is arranged:
Connect step, open inductively coupled plasma atomic emission spectrometer and adjust and its running parameter is set, radio-frequency power 1000W ~ 1300W, assisted gas flow velocity 0.1L/min ~ 0.5L/min, sample flow 1.0mL/min ~ 3.0mL/min, height of observation is 11mm ~ 15mm, nebulizer pressure 100kPa ~ 240kPa, flush time 10s ~ 20s;
Four, molybdenum and W content measure:
Connect step, light the plasma flame also abundant preheating stabilizer instrument of Inductively coupled plasma optical emission spectrometer, according to concentration order sequentially determining calibration curve series standard solution from low to high, then draw calibration operation curve and check its linear coefficient, last working sample clears up prepared solution to be measured, and the levels of molybdenum and W elements in calculation sample.
The rapid assay methods of molybdenum and W content in described tungstenic height molybdenum product, in described second step, the purity of High-Purity Molybdenum, molybdena is greater than 99.95%.
The rapid assay methods of molybdenum and W content in described tungstenic height molybdenum product, the net result calculating molybdenum and W content in described 4th step can be the measurement result of independent one article of molybdenum and tungsten analysis spectral line respectively, or the arithmetic mean of two and above molybdenum and tungsten analysis spectral line measurement result; Also namely with Mo 202.031nm, Mo 203.845nm, Mo 281.616nm and W 207.912nm, W 224.876nm, the mean value of arbitrary the spectral line measurement results such as W 248.923nm or two and above spectral line measurement result as molybdenum contained in tungstenic height molybdenum product and W elements final detections really.
Adopt technical scheme as above, the present invention has following beneficial effect:
The rapid assay methods of molybdenum and W content in a kind of tungstenic height molybdenum product of the present invention, the present invention can realize measuring molybdenum and W content in tungstenic height molybdenum product rapidly and accurately, particularly in high molybdenum product, molybdenum content measures, no longer there is assay method limitation by W content affects, also the troublesome operation such as the separation of molybdenum tungsten or complexing need not be carried out, the present invention is by the dilution to mother liquor in high molybdenum product, substantially increase the Stability and veracity of testing result, the method has broad application prospects.
[embodiment]
Can explain the present invention in more detail by the following examples, the present invention is not limited to the following examples;
The rapid assay methods of molybdenum and W content in a kind of tungstenic height molybdenum product of the present invention, concrete grammar is as follows:
One, Specimen eliminating:
1), containing high molybdenum alloy or intermediate alloy:
Take 0.1g ~ 0.5g sample and put into container, first with 5mL ~ 20mL water eluant container wall, adding 5 mL ~ 10mL quality than concentration is the red fuming nitric acid (RFNA) of 65% ~ 68%, heating for dissolving, after cooling, adding 3 mL ~ 10mL quality than concentration is the concentrated sulphuric acid of 95% ~ 98%, continue to be heated to micro-ly to emit sulfuric acid cigarette, after cooling, 200mL ~ 500mL being settled to containing molybdenum solution, shaking up for measuring tungsten;
2), molybdenum chemical products, molybdenum chemical products comprise molybdic acid, molybdena, ammonium molybdate:
Take 0.1 ~ 0.5g sample and put into container, add 5 mL ~ 20mL quality than concentration be 25% ~ 33% strong aqua or concentration be the sodium hydroxide solution of 10g/L ~ 20g/L, low-temperature heat, boil 3min ~ 15min, slightly cold, add 10 mL ~ 50mL water, adding 5 mL ~ 20mL quality than concentration is the red fuming nitric acid (RFNA) of 65% ~ 68%, continue to boil 3min ~ 10min, after cooling, adding 3 mL ~ 10mL quality than concentration is the concentrated sulphuric acid of 95 ~ 98%, continue to boil to solution limpid, after cooling, 200mL ~ 500mL being settled to containing molybdenum solution, shaking up for measuring tungsten;
3), by 1) step or 2) step obtain constant volume solution draw in 5 mL ~ 15mL to 50 mL ~ 100mL volumetric flask, adding 3 mL ~ 10mL quality is the red fuming nitric acid (RFNA) of 65% ~ 68% than concentration, is diluted with water to scale, shake up be used as measure molybdenum.
Two, calibration curve series standard solution preparation:
Connect step, take the High-Purity Molybdenum of 4 ~ 8 parts of different qualities, molybdena standard model is cleared up by first step sample digestion method, or add the commercially available molybdenum standard solution of respective amount, then commercially available tungsten standard solution is added or with tungsten standard substance preparing standard solution, be mixed with molybdenum and W elements is 4 ~ 8 concentration gradient points, and the W content range calibration series of curves solution of the molybdenum content of covering quality mark 10 % ~ 80% and massfraction 0.2% ~ 10%, the purity of described High-Purity Molybdenum, molybdena is greater than 99.95%;
Three, Instrument working parameter is arranged:
Connect step, open inductively coupled plasma atomic emission spectrometer and adjust and its running parameter is set, radio-frequency power 1000W ~ 1300W, assisted gas flow velocity 0.1L/min ~ 0.5L/min, sample flow 1.0mL/min ~ 3.0mL/min, height of observation is 11mm ~ 15mm, nebulizer pressure 100kPa ~ 240kPa, flush time 10s ~ 20s, described inductive coupling plasma emission spectrograph is the 2100DV type spectrometer of PE company;
Four, molybdenum and W content measure:
Connect step, light the plasma flame also abundant preheating stabilizer instrument of Inductively coupled plasma optical emission spectrometer, according to concentration order sequentially determining calibration curve series standard solution from low to high, then draw calibration operation curve and check its linear coefficient, last working sample clears up prepared solution to be measured, and the levels of molybdenum and W elements in calculation sample, molybdenum described here and tungsten standard curve range implication are: by regulating the High-Purity Molybdenum of Different Weight (or volume), molybdena, molybdenum-iron standard model or commercially available molybdenum standard solution are mixed with corresponding the series of calibration curve standard solution covering testing sample concentration range with tungsten standard substance preparing standard solution or commercially available tungsten standard solution, and the molybdenum be scaled in sample and W content.
The net result of wherein said calculating molybdenum and W content can be the measurement result of an independent molybdenum and tungsten analysis spectral line respectively, or the arithmetic mean of two and above molybdenum and tungsten analysis spectral line measurement result; Also namely with Mo 202.031nm, Mo 203.845nm, Mo 281.616nm and W 207.912nm, W 224.876nm, the mean value of arbitrary the spectral line measurement results such as W 248.923nm or two and above spectral line measurement result as molybdenum contained in tungstenic height molybdenum product and W elements final detections really.
Specific embodiments of the invention are as follows:
In an embodiment of the present invention, inductive coupling plasma emission spectrograph is PE company 2100DV type spectrometer.
Embodiment 1:
One, molybdenum-iron sample clear up preparation:
Accurately take 0.25g molybdenum-iron sample and put into container, first with 15mL water eluant container wall, adding 5mL quality than concentration is the red fuming nitric acid (RFNA) of 65 ~ 68%, after heating for dissolving, after cooling, adding 5mL quality than concentration is the concentrated sulphuric acid of 95 ~ 98%, continues to be heated to micro-ly to emit sulfuric acid cigarette.After cooling, 250mL being settled to containing molybdenum solution, shaking up for measuring tungsten;
Two, calibration curve series standard solution:
Typical curve series standard solution clears up preparation by molybdenum-iron standard model by above-mentioned sample digestion method.Be made up of the molybdenum standard solution of 6 concentration gradient points, the massfraction that molybdenum element content contained in standard solution corresponds to molybdenum in testing sample is respectively: 6.28%, 12.55%, 18.828%, 31.38%, 50.21%, 62.76%;
Three, instrument detected parameters is arranged:
Open ICP spectrometer and adjust its running parameter and be: radio-frequency power 1300W, assisted gas flow velocity 0.2L/min, sample flow 1.5mL/min, height of observation is 13mm, nebulizer pressure 110kPa, flush time 20s.Selected molybdenum analysis spectral line and detection integral domain, synchronously background correction region are in table 1;
Table 1 molybdenum and tungsten analysis spectral line
Four, constituent content is measured:
Light the plasma torch also abundant preheating stabilizer instrument of ICP spectrometer; According to concentration order sequentially determining calibration curve series standard solution from low to high, then draw calibration operation curve and check that its linearly dependent coefficient need be greater than 0.999, working sample clears up prepared molybdenum-iron sample solution to be measured.
Embodiment 2:
Molybdic acid sample tests, locate except following difference, all the other all adopt the identical method of embodiment 1 to measure the molybdic acid sample of embodiment 2: accurately take 0.25g molybdic acid sample and put into container, first with 15mL water eluant container wall, adding 10mL quality than concentration is the strong aqua of 25 ~ 33%, low-temperature heat, boil 5min, slightly cold, add 50mL water, adding 15mL quality than concentration is the red fuming nitric acid (RFNA) of 65 ~ 68%, continue to boil 5min, after cooling, adding 5mL quality than concentration is the concentrated sulphuric acid of 95 ~ 98%, continue to boil to solution limpid, after cooling, 250mL will be settled to containing molybdenum solution, shake up for measuring tungsten.
Calibration curve is made up of the molybdenum standard solution of 5 concentration gradient points, molybdenum element content contained in standard solution corresponds to molybdenum massfraction in sample to be tested and is respectively: 10.0%, 30.0%, 40.0%, 50.0%, 60.0%, tungsten massfraction is: 1.00%, 2.00%, 3.00%, 4.00%, 5.00%.
Embodiment 3 precision test
The preparation and the analysis mensuration that independently detect sample solution for 6 times are carried out respectively to molybdenum-iron sample in embodiment 1, statistical treatment is carried out to 8 measurement results, assesses precision of the present invention according to relative standard deviation (RSD%).Measurement result is in table 2.
Table 2 analytical approach precision (
n=6)
Embodiment 4 precision test
The preparation and the analysis mensuration that independently detect sample solution for 6 times are carried out respectively to molybdic acid sample in embodiment 2, statistical treatment is carried out to 6 measurement results, assesses precision of the present invention according to relative standard deviation (RSD%).Measurement result is in table 3.
Table 3 analytical approach precision (
n=6)
From table 2 and table 3, RSD (relative standard deviation) is not more than 2.0%, shows that the present invention has good precision, and preparation and the Instrument measuring reappearance of sample solution are good.From table 2 and table 3, each bar analysis spectral line of visible molybdenum and W elements is basically identical to same sample tests result, but still there is small differences, using the mean value of two and above analysis spectral line as final detection result, further increase the precision and accuracy that detect data.
Embodiment 5 result control test
The present embodiment measures molybdic acid sample molybdenum and W content in the molybdenum-iron in embodiment 1 and embodiment 2 respectively, then contrasts with other A laboratory measurements, and two laboratory measurements the results are shown in Table 4.
Table 4 the present invention and certain laboratory measurements control test
As seen from Table 4, the measurement result of method of the present invention and the result of certain experimental determination basically identical, Mo assay result meets standard GB/T 5059.1-2014 tolerance requirements, shows that the present invention has high accuracy and reliability.
In the present invention, inductively coupled plasma atomic emission (ICP-OES) detection method is completely different with the chemical analysis method such as oxine gravimetric method, ammonium metavanadate titrimetry from existing lead molybdate in ultimate principle, mode of operation etc., without any relevance.And, under normal circumstances in tungstenic height molybdenum product molybdenum element content up to about 75%, W elements content is between 0.05 ~ 10%, the mensuration of its content belongs to constant or primaries composition detection analysis field, and in the known working sample of industry, the chemical composition of macroconcentration scope needs to select the Traditional Man such as gravimetric method, titrimetry chemical analysis method usually.
The present invention is by carrying out complex optimum to location parameter each in analytical equipment, optimize adequate sensitivity analysis spectral line etc., prepare solution concentration by physical dilution sample simultaneously, by the spectral signal strength control of molybdenum element in tungstenic height molybdenum product at a proper level, thus the spectral signal intensity avoided because of molybdenum analysis spectral line is overflowed higher than the capacity of signal detector.
Feature of the present invention is not need because tungsten and molybdenum have similar character, the difficult problem such as cannot to be separated completely, even if simultaneously tungstenic height molybdenum sample in the product W content more than in more than 2% situation, without the need to additionally taking separating for several times again, other any loaded down with trivial details tungsten lock out operation such as complexing, mensuration program is simple, also a large amount of chemical reagent need not be consumed, thus decrease a large amount of man power and material, greatly reduce chemical reagent simultaneously, the particularly use of heavy metal lead solution, only use a small amount of nitric acid, sulfuric acid, the non-heavy metal reagent such as ammoniacal liquor, environment is avoided to be polluted.Step of the present invention is few, easily grasps operation, and hand labor intensity is low, does not affect by human factors such as operator quality level and skills involved in the labour, and particularly inspection process is short, analysis speed fast, only needs 30 min can complete sample analysis task.The shortcoming such as comparatively traditional analysis chemical reagent consumption is many.
The present invention is except having the accuracy identical with chemical analysis method, have outside clear superiority in manpower and physical resources consumption and analysis speed, not only field sample Fast Measurement is produced in suitable scientific research symphysis, timely feedback data Instructing manufacture technological parameter regulation and control, meet the needs of process of producing product quality supervision and test, and in commerce and trade, for tungstenic higher than more than 2% molybdenum product use traditional chemical analysis method molybdenum tungsten to be separated completely to provide solution, therefore, the application value of this inventive method is large, has a extensive future.
The present invention is widely applicable, detectable concentration wide ranges, and antijamming capability is strong, and simple to operate, easily grasp, the technical indicators such as accuracy, precision, the recovery are excellent.
Part not in the detailed description of the invention is prior art.
The embodiment selected in this article in order to open object of the present invention, currently thinks to be suitable for, but it is to be understood that the present invention is intended to comprise all changes belonging to the embodiment in this design and invention scope and improvement.
Claims (3)
1. the rapid assay methods of molybdenum and W content in tungstenic height molybdenum product, is characterized in that: concrete grammar is as follows:
One, Specimen eliminating:
1), containing high molybdenum alloy or intermediate alloy:
Take 0.1g ~ 0.5g sample and put into container, first with 5mL ~ 20mL water eluant container wall, adding 5 mL ~ 10mL quality than concentration is the red fuming nitric acid (RFNA) of 65% ~ 68%, heating for dissolving, after cooling, adding 3 mL ~ 10mL quality than concentration is the concentrated sulphuric acid of 95% ~ 98%, continue to be heated to micro-ly to emit sulfuric acid cigarette, after cooling, 200mL ~ 500mL being settled to containing molybdenum solution, shaking up for measuring tungsten;
2), molybdenum chemical products:
Take 0.1 ~ 0.5g sample and put into container, add 5 mL ~ 20mL quality than concentration be 25% ~ 33% strong aqua or concentration be the sodium hydroxide solution of 10g/L ~ 20g/L, low-temperature heat, boil 3min ~ 15min, slightly cold, add 10 mL ~ 50mL water, adding 5 mL ~ 20mL quality than concentration is the red fuming nitric acid (RFNA) of 65% ~ 68%, continue to boil 3min ~ 10min, after cooling, adding 3 mL ~ 10mL quality than concentration is the concentrated sulphuric acid of 95 ~ 98%, continue to boil to solution limpid, after cooling, 200mL ~ 500mL being settled to containing molybdenum solution, shaking up for measuring tungsten;
3), by 1) step or 2) step obtain constant volume solution draw in 5 mL ~ 15mL to 50 mL ~ 100mL volumetric flask, adding 3 mL ~ 10mL quality is the red fuming nitric acid (RFNA) of 65% ~ 68% than concentration, is diluted with water to scale, shake up be used as measure molybdenum;
Two, calibration curve series standard solution preparation:
Connect step, take the High-Purity Molybdenum of 4 ~ 8 parts of different qualities, molybdena standard model is cleared up by first step sample digestion method, or add the commercially available molybdenum standard solution of respective amount, then commercially available tungsten standard solution is added or with tungsten standard substance preparing standard solution, be mixed with molybdenum and W elements is 4 ~ 8 concentration gradient points, and the W content range calibration series of curves solution of the molybdenum content of covering quality mark 10 % ~ 80% and massfraction 0.2% ~ 10%;
Three, Instrument working parameter is arranged:
Connect step, open inductively coupled plasma atomic emission spectrometer and adjust and its running parameter is set, radio-frequency power 1000W ~ 1300W, assisted gas flow velocity 0.1L/min ~ 0.5L/min, sample flow 1.0mL/min ~ 3.0mL/min, height of observation is 11mm ~ 15mm, nebulizer pressure 100kPa ~ 240kPa, flush time 10s ~ 20s;
Four, molybdenum and W content measure:
Connect step, light the plasma flame also abundant preheating stabilizer instrument of Inductively coupled plasma optical emission spectrometer, according to concentration order sequentially determining calibration curve series standard solution from low to high, then draw calibration operation curve and check its linear coefficient, last working sample clears up prepared solution to be measured, and the levels of molybdenum and W elements in calculation sample.
2. the rapid assay methods of molybdenum and W content in tungstenic height molybdenum product according to claim 1, is characterized in that: in described second step, the purity of High-Purity Molybdenum, molybdena is greater than 99.95%.
3. the rapid assay methods of molybdenum and W content in tungstenic height molybdenum product according to claim 1, it is characterized in that: the net result calculating molybdenum and W content in described 4th step can be the measurement result of independent one article of molybdenum and tungsten analysis spectral line respectively, or the arithmetic mean of two and above molybdenum and tungsten analysis spectral line measurement result; Also namely with Mo 202.031nm, Mo 203.845nm, Mo 281.616nm and W 207.912nm, W 224.876nm, the mean value of arbitrary the spectral line measurement results such as W 248.923nm or two and above spectral line measurement result as molybdenum contained in tungstenic height molybdenum product and W elements final detections really.
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| CN111307787A (en) * | 2020-03-19 | 2020-06-19 | 中国船舶重工集团公司第七二五研究所 | Method for measuring molybdenum content in molybdenum waste residue |
| CN111307786A (en) * | 2020-03-19 | 2020-06-19 | 河北四通新型金属材料股份有限公司 | Method for detecting molybdenum element in molybdenum niobium aluminum silicon titanium alloy |
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