CN101639438A - Detection method of lead content in gasoline - Google Patents
Detection method of lead content in gasoline Download PDFInfo
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- CN101639438A CN101639438A CN200910023740A CN200910023740A CN101639438A CN 101639438 A CN101639438 A CN 101639438A CN 200910023740 A CN200910023740 A CN 200910023740A CN 200910023740 A CN200910023740 A CN 200910023740A CN 101639438 A CN101639438 A CN 101639438A
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Abstract
The invention relates to a detection method of lead content in gasoline, comprising the following steps: preparing solution, preparing lead standard solution, preparing sample to be detected, drawingstandard curve and detecting the lead content in the gasoline. Compared with GB/T8020, the invention adopts glacial acetic acid-methyl isobutyl ketone solution with mass concentration of 3.0%, improves the stability of a dilution dissolvent system, reduces preparation times of the standard solution, saves resources and avoids environment pollution and hazards to personnel; no lead-poor gasoline isadded in the preparation of the standard solution to reduce the detection limit of the method to 0.02mg/L (0.0428), thus satisfying the need of actual analysis and detection and ensuring the accuracyof data. The detection method used for detecting the same test sample has the advantages of smaller relative standard deviation, high sensitivity and longer stable storage time of work standard solution which can still meet analysis requirement even after being stored for 30 days.
Description
Technical field
The invention belongs to by means of the chemistry of measuring material or physical property is tested or the analysis of material technical field, be specifically related to test content plumbous in the gasoline.
Background technology
The test method of regulation mensuration lead content is GB/T8020 " doping of gasoline content determination (atomic absorption spectrography (AAS)) " among the GB17930-2006 " motor petrol ", state in the use and find the defective that the GB/T8020 assay method mainly exists in the method for testing of lead content in the gasoline: the one, the standard solution that this method is used need promptly be joined promptly and used, the preparation time is longer, and preparing a standard solution needs 10 hours; Secondly standard solution easily fades after seeing light or storage, and chemical change takes place, and surplus solution can't reuse, and can only discard, and causes waste and contaminated environment; And diluting solvent adopts hexone, belongs to noxious material, and it can stimulate people's eyes, and the mucous membrane upper respiratory system contacts this reagent for a long time, threatens the healthy of operator.In addition, lead content is not more than 0.005g/L in the middle regulation gasoline of GB17930-2006 " motor petrol ", and GB/T8020 " doping of gasoline content determination (atomic absorption spectrography (AAS)) " must measurement range be 2.5～25mg/L, unleaded along with gasoline, the detection lower limit of this method can not satisfy the needs that actual analysis detects.At above defective, the inventor improves GB/T8020, solves GB/T8020 problem in use, improves the doping of gasoline content detecting method.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the shortcoming of lead content detection method in the above-mentioned gasoline, and the detection method of lead content in the long gasoline of a kind of highly sensitive, standard solution good stability, period of storage is provided.
Solving the problems of the technologies described above the technical scheme that is adopted is that it comprises the steps:
1, obtain solution
Use methyl tricaprylammonium chloride, hexone according to a conventional method, be mixed with mass concentration and be methyl tricaprylammonium chloride-hexone solution of 10%; Being mixed with mass concentration with iodine, toluene is 3.0% iodo-toluene solution; Being mixed with mass concentration with glacial acetic acid, hexone is glacial acetic acid-hexone solution of 3.0%.
2, prepare plumbous standard solution
(1) be that the atomic absorption spectrography (AAS) compound concentration is the plumbous standard solution of 1321mgPb/L lead-methyl tricaprylammonium chloride-hexone by GB/T8020 doping of gasoline content determination, being diluted to mass concentration with this standard solution is the plumbous standard solution of 264mgPb/L lead-methyl tricaprylammonium chloride-hexone.
(2) three kinds of plumbous standard solution of preparation
Sucking mass concentration with transfer pipet is the plumbous standard solution 2.0 of 264mgPb/L lead-methyl tricaprylammonium chloride-hexone, 5.0,10.0mL, transfer to respectively in 3 volumetric flasks that 100mL has vinyl cover, add the 0.1mL mass concentration in each bottle respectively and be 3.0% iodo-toluene solution, 5.0mL mass concentration is methyl tricaprylammonium chloride-hexone solution of 1%, the 5mL mass concentration is glacial acetic acid-hexone solution of 3.0%, be diluted to scale with hexone, shake up, be stored in the brown bottle of band vinyl cover, be mixed with mass concentration and be respectively 5.28,13.21,26.42mgPb/L plumbous standard solution.
3, preparation sample to be tested
Hexone is joined 50mL to be had in the volumetric flask of vinyl cover, add gasoline sample to be measured with transfer pipet, the adding mass concentration is 3.0% iodo-toluene solution, after 1 minute, add mass concentration again and be 1.0% methyl tricaprylammonium chloride-hexone solution and mass concentration and be glacial acetic acid-hexone solution of 3.0%, hexone and gasoline sample, mass concentration is 3.0% iodo-toluene solution, mass concentration is methyl tricaprylammonium chloride-hexone solution of 1.0%, mass concentration is that the volume ratio of glacial acetic acid-hexone solution of 3.0% is 30: 5: 0.1: 5: 5, be diluted to scale with hexone, be mixed with solution to be measured.
4, production standard curve
Get 4 50mL volumetric flasks that have vinyl cover, add hexone respectively, one of them not the leading standard solution as blank, in addition 3 volumetric flasks add respectively that mass concentration is respectively 5.28,13.21, the plumbous standard solution of 26.42mgPb/L, add mass concentration in 4 volumetric flasks respectively and be 3.0% iodo-toluene solution, mass concentration and be 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration and be glacial acetic acid-hexone solution of 3.0%; Hexone and mass concentration are that plumbous standard solution, the mass concentration of 0mgPb/L is that 3.0% iodo-toluene solution, mass concentration are that 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration are that the volume ratio of 3.0% glacial acetic acid-hexone solution is 30: 0: 0.1: 5: 5; Hexone and mass concentration are that plumbous standard solution, the mass concentration of 5.28mgPb/L is that 3.0% iodo-toluene solution, mass concentration are that 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration are that the volume ratio of 3.0% glacial acetic acid-hexone solution is 30: 5: 0.1: 5: 5; Hexone and mass concentration are that plumbous standard solution, the mass concentration of 13.21mgPb/L is that 3.0% iodo-toluene solution, mass concentration are that 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration are that the volume ratio of 3.0% glacial acetic acid-hexone solution is 30: 5: 0.1: 5: 5; Hexone and mass concentration are that plumbous standard solution, the mass concentration of 26.42mgPb/L is that 3.0% iodo-toluene solution, mass concentration are that 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration are that the volume ratio of 3.0% glacial acetic acid-hexone solution is 30: 5: 0.1: 5: 5; Be diluted to scale with hexone respectively, be mixed with mass concentration and be 0.00,0.53,1.32, the splicer of 2.64mgPb/L makes standard solution.
Concentration with plumbous standard solution is horizontal ordinate, and absorbance is an ordinate, by the computer drawing curve, and draws the equation of linear regression of typical curve:
Y
1＝54.28X
1-0.031 (1)
Y in the formula
1For splicer makes the absorbance of standard solution, X
1For splicer makes the lead concentration of standard solution, related coefficient is 0.9997.
5, detect content plumbous in the gasoline
Sample to be tested is detected wherein lead content with Atomic Absorption Spectrometer, the wavelength of Atomic Absorption Spectrometer is that 283.3nm, spectral band-width are that 0.7nm, lamp current are that 8mA, combustion gas/combustion-supporting gas ratio are that 1.6: 16, burner height are 10nm, inhale the spray sample to be tested, measure its absorbance, calculate concentration plumbous in the testing sample by equation of linear regression (1) by computing machine.
Adopting the present invention compares with GB/T8020, add mass concentration and be glacial acetic acid-hexone solution of 3.0%, improved the stability of diluting solvent system, reduced the preparation number of times of standard solution, economize on resources, avoid causing to the pollution of environment and reduce harm human body; When the plumbous standard solution of preparation, do not add poor plumbous gasoline, make the detection limit of method be reduced to 0.0428mg/L, satisfied the needs that actual analysis detects, guaranteed the accuracy of data.The relative standard deviation of measuring same sample with the present invention is less, and the solution-stabilized resting period of highly sensitive, working stamndard obviously prolongs, deposit 30 days after, still can satisfy the analysis requirement.
Embodiment
The present invention is described in more detail below in conjunction with embodiment, but the invention is not restricted to these embodiment.
Embodiment 1
1, obtain solution
Use methyl tricaprylammonium chloride, hexone according to a conventional method, be mixed with mass concentration and be methyl tricaprylammonium chloride-hexone solution of 10%; Being mixed with mass concentration with iodine, toluene is 3.0% iodo-toluene solution; Being mixed with mass concentration with glacial acetic acid, hexone is glacial acetic acid-hexone solution of 3.0%.
2, prepare plumbous standard solution
(1) be that the atomic absorption spectrography (AAS) compound concentration is the plumbous standard solution of 1321mgPb/L lead-methyl tricaprylammonium chloride-hexone by GB/T8020 doping of gasoline content determination, being diluted to mass concentration with this standard solution is the plumbous standard solution of 264mgPb/L lead-methyl tricaprylammonium chloride-hexone.
(2) three kinds of plumbous standard solution of preparation
Sucking mass concentration with transfer pipet is that the plumbous standard solution of 264mgPb/L lead-methyl tricaprylammonium chloride-hexone is 2.0,5.0,10.0mL, transfer to respectively in 3 volumetric flasks that 100mL has vinyl cover, add the 0.1mL mass concentration in each bottle respectively and be 3.0% iodo-toluene solution, 5.0mL mass concentration is methyl tricaprylammonium chloride-hexone solution of 1%, the 5mL mass concentration is 3.0% glacial acetic acid-hexone solution, be diluted to scale with hexone, shake up, be stored in the brown bottle of band vinyl cover, be mixed with mass concentration and be respectively 5.28,13.21,26.42mgPb/L plumbous standard solution.
3, preparation sample to be tested
The 30mL hexone is joined 50mL to be had in the volumetric flask of vinyl cover, add the gasoline sample to be measured that 5.0mL shakes up with transfer pipet, adding 0.1mL mass concentration is 3.0% iodo-toluene solution, after 1 minute, add 1.0% methyl tricaprylammonium chloride that mass concentration is 5.0mL-hexone solution and 5mL mass concentration again and be glacial acetic acid-hexone solution of 3.0%, be diluted to scale with hexone, be mixed with solution to be measured.
4, production standard curve
Get 4 50mL volumetric flasks that have vinyl cover, add the 30mL hexone respectively, one of them not the leading standard solution as blank, in addition 3 volumetric flasks add respectively that the 5.0mL mass concentration is respectively 5.28,13.21, the plumbous standard solution of 26.42mgPb/L, add the 0.1mL mass concentration in 4 volumetric flasks respectively and be 3.0% iodo-toluene solution, 5.0mL mass concentration and be 1.0% methyl tricaprylammonium chloride-hexone, 5mL mass concentration and be glacial acetic acid-hexone solution of 3.0%, be diluted to scale with hexone.Be mixed with mass concentration and be 0.00,0.53,1.32, the splicer of 2.64mgPb/L makes standard solution.
Concentration with plumbous standard solution is horizontal ordinate, and absorbance is an ordinate, by the computer drawing curve, and draws the equation of linear regression of typical curve:
Y
1＝54.28X
1-0.031 (1)
Y in the formula
1For splicer makes the absorbance of standard solution, X
1For splicer makes the lead concentration of standard solution, related coefficient is 0.9997.
5, detect content plumbous in the gasoline
Sample to be tested is detected wherein lead content with Atomic Absorption Spectrometer, the wavelength of Atomic Absorption Spectrometer is that 283.3nm, spectral band-width are that 0.7nm, lamp current are that 8mA, combustion gas/combustion-supporting gas ratio are that 1.6: 16, burner height are 10mm, inhale the spray sample to be tested, measure its absorbance, calculating concentration plumbous in the testing sample by computing machine by equation of linear regression (1) is 0.542mg/L.
In order to verify the beneficial effect of detection method of the present invention, the inventor adopts the detection method of the embodiment of the invention 1 and GB/T8020 determination method to carry out comparison and detection, and detection case is as follows:
1, the recovery of standard addition of GB/T8020 determination method and determination method of the present invention
GB/T8020 determination method: get the volumetric flask that 4 50mL have vinyl cover, adding 30mL hexone and 2.5mL mass concentration respectively is the plumbous standard solution of 5.3mg/L, adding mass concentration more respectively is the plumbous standard solution 2.0 of 13.2mgPb/L, 4.0,6.0,8.0mL, add the 0.1mL mass concentration then and be 3.0% iodo-toluene solution, 5.0mL mass concentration is methyl tricaprylammonium chloride-hexone of 1.0%, be diluted to scale with hexone, being mixed with plumbous mass concentration is 0.793,1.321,1.849,2.377mgPb/L testing sample solution.By GB/T8020 doping of gasoline content determination is the aas determination lead content.Measurement result sees Table 1.
Determination method of the present invention: other gets the volumetric flask that 4 50mL have vinyl cover, adding 30mL hexone and 2.5mL mass concentration respectively is the 5.3mg/L aluminum standard solution, add 2.0 respectively again, 4.0,6.0,8.0mL mass concentration is a 13.2mg/L lead standard solution, add the 0.1mL mass concentration then and be 3.0% iodo-toluene solution, 5.0mL mass concentration is 1.0% methyl tricaprylammonium chloride-hexone and 5mL mass concentration is glacial acetic acid-hexone solution of 3.0%, be diluted to scale with hexone, being mixed with lead content is 0.793,1.321,1.849,2.377mg/L testing sample solution.Press embodiment 1 method and measure lead content.
Measurement result sees Table 1.
The recovery of standard addition of table 1 GB/T8020 determination method and determination method of the present invention
As can be seen from Table 1, GB/T8020 determination method recovery of standard addition is 95.4%～100.2%, and the recovery of standard addition of determination method of the present invention is 97.6%～101.9%, and determination method of the present invention and GB/T8020 determination method all can satisfy measures requirement.
2, the sensitivity of GB/T8020 determination method and determination method of the present invention
With GB/T8020 determination method and determination method of the present invention respectively to mass concentration be 0.53,1.32, the splicer of 2.64mgPb/L makes standard solution, detects its absorbance with Atomic Absorption Spectrometer, calculates relative sensitivity by following formula:
S＝c×0.0044/A
S is a relative sensitivity in the formula, and c is a detected solution concentration, and A is a solution absorbance.
Test and result of calculation see Table 2.
The sensitivity of table 2 GB/T8020 determination method and determination method of the present invention
By table 2 as seen, adopt determination method of the present invention to replace the GB/T8020 determination method after, relative sensitivity can improve 0.04 μ g/mL.
3, the stability of GB/T8020 determination method and determination method of the present invention
With GB/T8020 determination method and determination method of the present invention respectively to mass concentration be 0.53,1.32, the splicer of 2.64mgPb/L makes standard solution, detects its absorbance with Atomic Absorption Spectrometer.
Test result sees Table 3.
The stability of table 3 GB/T8020 determination method and determination method of the present invention
By table 3 as seen, determination method of the present invention is compared with the GB/T8020 determination method, and splicer does the standard solution resting period and obviously prolongs, deposit 30 days after, still can satisfy the analysis requirement.The splicer of GB/T8020 determination method makes standard solution need promptly join i.e. usefulness, can not deposit.
4, the precision of GB/T8020 determination method and determination method of the present invention
Use the assay method of the GB/T8020 determination method and the embodiment of the invention 1 respectively, same sample is measured 6 times, test result sees Table 4.
The precision of table 4 GB/T8020 determination method and determination method of the present invention
Compared with the GB/T8020 determination method by the visible determination method of the present invention of table 4, standard deviation reduces 0.029, and relative standard deviation reduces 5.19%, 95% fiducial interval can satisfy the analysis requirement.
5, the detection limit of the inventive method
Get the volumetric flask that 2 50mL have vinyl cover, each adds the hexone of 30mL, add 1.0 respectively, the 3.0mL mass concentration is the plumbous standard solution of 1.32mgPb/L, add the 0.1mL mass concentration more respectively and be 3.0% iodo-toluene solution, 5.0mL mass concentration and be 1.0% methyl tricaprylammonium chloride-hexone and 5mL mass concentration and be glacial acetic acid-hexone solution of 3.0%, be diluted to scale with hexone at last.Be mixed with plumbous mass concentration and be 0.0264, the 0.0792mgPb/L testing sample solution.Press embodiment 1 method and measure lead content.Measurement result sees Table 5.
The detection limit of table 5 the inventive method
Annotate: s represents standard deviation in the table, and RSD represents relative standard deviation, C
LThe expression detection limit.
Finding out, when plumbous addition is that 3.96 μ g are lead concentration when being 0.0792mg/L, its S is 0.00714 from table 5, and RSD% is 9.24, C
LMore reasonable for the statistical parameter of 0.0428mg/L, can think C
LFor 0.0428mgPb/L is a method detection limit of the present invention.
Experiment conclusion
More than experiment has confirmed that from aspects such as data accuracy, precision, recovery of standard addition, system sensitivity, system stability, method detectabilities the present invention accurately, reliably, it is poor to solve among the GB/T8020 standard stability of solution, period of storage is short and sensitivity is not high, the lowest detection line can not satisfy technical matterss such as actual analysis detection, improves the detection method of motor petrol lead content.If adopt this method to substitute existing motor petrol lead content detection method, in use also need regularly the test that compares with GB/T8020 " doping of gasoline content determination ", this method is demarcated, to guarantee to analyze the accurate, reliably of data.
Claims (1)
1, the detection method of lead content in a kind of gasoline is characterized in that it is made up of following step:
(1) obtain solution
Use methyl tricaprylammonium chloride, hexone according to a conventional method, be mixed with mass concentration and be methyl tricaprylammonium chloride-hexone solution of 10%; Being mixed with mass concentration with iodine, toluene is 3.0% iodo-toluene solution; Being mixed with mass concentration with glacial acetic acid, hexone is glacial acetic acid-hexone solution of 3.0%;
(2) prepare plumbous standard solution
1. be that the atomic absorption spectrography (AAS) compound concentration is the plumbous standard solution of 1321mgPb/L lead-methyl tricaprylammonium chloride-hexone by GB/T8020 doping of gasoline content determination, being diluted to mass concentration with this standard solution is the plumbous standard solution of 264mgPb/L lead-methyl tricaprylammonium chloride-hexone;
2. prepare three kinds of plumbous standard solution
Sucking mass concentration with transfer pipet is the plumbous standard solution 2.0 of 264mgPb/L lead-methyl tricaprylammonium chloride-hexone, 5.0,10.0mL, transfer to respectively in 3 volumetric flasks that 100mL has vinyl cover, add the 0.1mL mass concentration in each bottle respectively and be 3.0% iodo-toluene solution, 5.0mL mass concentration is methyl tricaprylammonium chloride-hexone solution of 1%, the 5mL mass concentration is glacial acetic acid-hexone solution of 3.0%, be diluted to scale with hexone, shake up, be stored in the brown bottle of band vinyl cover, be mixed with mass concentration and be respectively 5.28,13.21,26.42mgPb/L plumbous standard solution;
(3) preparation sample to be tested
Hexone is joined 50mL to be had in the volumetric flask of vinyl cover, add gasoline sample to be measured with transfer pipet, the adding mass concentration is 3.0% iodo-toluene solution, after 1 minute, add mass concentration again and be 1.0% methyl tricaprylammonium chloride-hexone solution and mass concentration and be glacial acetic acid-hexone solution of 3.0%, hexone and gasoline sample, mass concentration is 3.0% iodo-toluene solution, mass concentration is methyl tricaprylammonium chloride-hexone solution of 1.0%, mass concentration is that the volume ratio of glacial acetic acid-hexone solution of 3.0% is 30: 5: 0.1: 5: 5, be diluted to scale with hexone, be mixed with solution to be measured;
(4) production standard curve
Get 4 50mL volumetric flasks that have vinyl cover, add hexone respectively, one of them not the leading standard solution as blank, in addition 3 volumetric flasks add respectively that mass concentration is respectively 5.28,13.21, the plumbous standard solution of 26.42mgPb/L, add mass concentration in 4 volumetric flasks respectively and be 3.0% iodo-toluene solution, mass concentration and be 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration and be glacial acetic acid-hexone solution of 3.0%; Hexone and mass concentration are that plumbous standard solution, the mass concentration of 0mgPb/L is that 3.0% iodo-toluene solution, mass concentration are that 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration are that the volume ratio of 3.0% glacial acetic acid-hexone solution is 30: 0: 0.1: 5: 5; Hexone and mass concentration are that plumbous standard solution, the mass concentration of 5.28mgPb/L is that 3.0% iodo-toluene solution, mass concentration are that 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration are that the volume ratio of 3.0% glacial acetic acid-hexone solution is 30: 5: 0.1: 5: 5; Hexone and mass concentration are that plumbous standard solution, the mass concentration of 13.21mgPb/L is that 3.0% iodo-toluene solution, mass concentration are that 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration are that the volume ratio of 3.0% glacial acetic acid-hexone solution is 30: 5: 0.1: 5: 5; Hexone and mass concentration are that plumbous standard solution, the mass concentration of 26.42mgPb/L is that 3.0% iodo-toluene solution, mass concentration are that 1.0% methyl tricaprylammonium chloride-hexone solution, mass concentration are that the volume ratio of 3.0% glacial acetic acid-hexone solution is 30: 5: 0.1: 5: 5; Be diluted to scale with hexone respectively, be mixed with mass concentration and be 0.00,0.53,1.32, the splicer of 2.64mgPb/L makes standard solution;
Concentration with plumbous standard solution is horizontal ordinate, and absorbance is an ordinate, by the computer drawing curve, and draws the equation of linear regression of typical curve:
Y
1＝54.28X
1-0.031 (1)
Y in the formula
1For splicer makes the absorbance of standard solution, X
1For splicer makes the lead concentration of standard solution, related coefficient is 0.9997;
(5) detect content plumbous in the gasoline
Sample to be tested is detected wherein lead content with Atomic Absorption Spectrometer, the wavelength of Atomic Absorption Spectrometer is that 283.3nm, spectral band-width are that 0.7nm, lamp current are that 8mA, combustion gas/combustion-supporting gas ratio are that 1.6: 16, burner height are 10mm, inhale the spray sample to be tested, measure its absorbance, calculate concentration plumbous in the testing sample by equation of linear regression (1) by computing machine.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372196A (en) * | 2015-12-10 | 2016-03-02 | 深圳市众凯检测技术有限公司 | Detection method of lead content of food |
| CN106769950A (en) * | 2017-02-27 | 2017-05-31 | 苏州恒润商品检验有限公司 | The detection method of Lead in Gasoline |
| CN109211654A (en) * | 2017-07-05 | 2019-01-15 | 中国石油天然气股份有限公司 | The detection method of trace impurity ion and the absorbing liquid for it in light olefin class gas |
| CN110895218A (en) * | 2019-12-24 | 2020-03-20 | 青岛海关技术中心 | Standard substance for detecting lead, manganese and iron contents in gasoline |
| CN112051224A (en) * | 2020-08-12 | 2020-12-08 | 昆明理工大学 | Method for detecting blending ratio of biodiesel blending fuel based on ultraviolet-visible spectrophotometry |
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2009
- 2009-08-31 CN CN200910023740A patent/CN101639438A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372196A (en) * | 2015-12-10 | 2016-03-02 | 深圳市众凯检测技术有限公司 | Detection method of lead content of food |
| CN105372196B (en) * | 2015-12-10 | 2018-05-08 | 深圳市众凯检测技术有限公司 | A kind of detection method of Lead Content in Foodstuff |
| CN106769950A (en) * | 2017-02-27 | 2017-05-31 | 苏州恒润商品检验有限公司 | The detection method of Lead in Gasoline |
| CN109211654A (en) * | 2017-07-05 | 2019-01-15 | 中国石油天然气股份有限公司 | The detection method of trace impurity ion and the absorbing liquid for it in light olefin class gas |
| CN110895218A (en) * | 2019-12-24 | 2020-03-20 | 青岛海关技术中心 | Standard substance for detecting lead, manganese and iron contents in gasoline |
| CN112051224A (en) * | 2020-08-12 | 2020-12-08 | 昆明理工大学 | Method for detecting blending ratio of biodiesel blending fuel based on ultraviolet-visible spectrophotometry |
| CN112051224B (en) * | 2020-08-12 | 2021-08-06 | 昆明理工大学 | Method for detecting blending ratio of biodiesel blending fuel based on ultraviolet-visible spectrophotometry |
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