CN106248462A - For wide distributed granule standard substance calibrating particle size analyzer and preparation method thereof - Google Patents
For wide distributed granule standard substance calibrating particle size analyzer and preparation method thereof Download PDFInfo
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- CN106248462A CN106248462A CN201610900147.5A CN201610900147A CN106248462A CN 106248462 A CN106248462 A CN 106248462A CN 201610900147 A CN201610900147 A CN 201610900147A CN 106248462 A CN106248462 A CN 106248462A
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- G—PHYSICS
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention relates to the wide distributed granule standard substance for calibrating particle size analyzer, described wide distributed granule standard substance crosslinked polystyrene subsample different by particle diameter, that the coefficient of variation is identical forms, and the particle diameter distribution D90:D10 of described wide distributed granule standard substance is 3.8 4.2.Described wide distributed granule standard substance is made by following steps: puts in lauryl sodium sulfate aqueous solution by styrene monomer, polyvinyl alcohol, initiator and cross-linking agent, obtains mixed solution；Described mixed solution is heated to predetermined temperature simultaneously, reacts the scheduled time, take out washing, obtain crosslinked polystyrene particle；Described crosslinked polystyrene particle is put into the stirring ultrasonic disperse scheduled time 1 in lauryl sodium sulfate aqueous solution, settles the scheduled time 2, extraction upper strata suspension predetermined, obtain described crosslinked polystyrene subsample；Particle diameter is different, the coefficient of variation is identical described crosslinked polystyrene subsample mixing, makes described wide distributed granule standard substance.
Description
Technical field
The invention belongs to standard matter preparing technology field, relate to calibrate the wide distributed granule standard of particle size analyzer
Material and preparation method thereof, and relate to the preparation method of a kind of wide distributed granule standard substance for calibrating particle size analyzer.
Background technology
Powder body material is a kind of new material that development in recent years is got up, and it is in sides such as catalysis, light absorption, medical treatment, sterilizations
Mask has the good characteristic that conventional powder material is incomparable, is the most gradually paid attention to by whole world various countries, at present, many
National government all carries out research and the industrialization production of powder body material at the substantial amounts of human and material resources of input and financial resources.But people
The feature of the physicochemical characteristics of powder body material of interest is exactly that the size depending strongly on granule, i.e. powder body material show
Significantly dimensional effect.This size allowing for measuring the most accurately powder body material becomes preparation, studies, applies powder body material
Unusual distinct issues.
Particle size analyzer has become as micron/nano split particle diameter and the important means of distribution sign.The whether accurate of particle size analyzer needs
Want correction and the calibrating of particle size standard substance.Particle size standard substance is considered as the having of magnitude tracing in granulometry
Imitate carrier and ensure the generally acknowledged effective means that granulometry value is accurate, reliable, consistent.At present, external many metrological services are non-
Often pay attention to and carried out one after another the correlational study work of granularity measurement criteria and magnitude tracing system.In order to improve granulometry
Trace to the source and transport system, ensure that China is consistent at the international equivalent of granulometry, the invention discloses one and can trace to the source to China
The wide distribution reference materials for particle size analysis of measurement criteria, supplementing as existing reference materials for particle size analysis.
Summary of the invention
It is an object of the invention to provide the wide distributed granule standard substance for calibrating particle size analyzer and preparation side thereof
Method.
The present invention also aims to provide the system of a kind of wide distributed granule standard substance for calibrating particle size analyzer
Preparation Method.
For arriving foregoing invention purpose, on the one hand, for calibrating the wide distributed granule standard substance of particle size analyzer, its
In, the crosslinked polystyrene subsample that wide distributed granule standard substance is different by particle diameter, the coefficient of variation is identical forms, wide distribution
The particle diameter distribution D90:D10 of grain standard substance is 3.8-4.2.
Wherein, the particle size range of wide distributed granule standard substance can be 5-100 μm.
It addition, wide distributed granule standard substance can be by the crosslinking polyphenyl that 6-18 kind particle diameter, the coefficient of variation are 10%-20%
Ethylene subsample is mixed.
It addition, above-mentioned wide distributed granule standard substance makes as follows: preparation process: by styrene monomer, gather
Vinyl alcohol, initiator and cross-linking agent are put in lauryl sodium sulfate aqueous solution, obtain mixed solution；Reactions steps: be passed through nitrogen
Gas agitating, is heated to predetermined temperature simultaneously by mixed solution, reacts the scheduled time, takes out washing, obtains crosslinked polystyrene
Grain；Separating step: crosslinked polystyrene particle is put into the stirring ultrasonic disperse scheduled time in lauryl sodium sulfate aqueous solution
1, settle the scheduled time 2, extraction upper strata suspension predetermined, obtain crosslinked polystyrene subsample；And blend step: by grain
The crosslinked polystyrene subsample mixing that footpath is different, the coefficient of variation is identical, makes wide distributed granule standard substance.
It addition, the initiator in preparation process can be benzoyl peroxide, cross-linking agent can be divinylbenzene.
It addition, the lauryl sodium sulfate aqueous solution concentration in preparation process can be 0.25%-0.4%.
It addition, the volume ratio of styrene monomer in preparation process and lauryl sodium sulfate aqueous solution can be 1:7-
20, polyvinyl alcohol can be 1:4-10 with the volume ratio of lauryl sodium sulfate aqueous solution, benzoyl peroxide and styrene list
The mass ratio of body can be 1-5:100, and divinylbenzene can be 1-10:100 with the mass ratio of styrene monomer.
It addition, the stir speed (S.S.) in reactions steps can be 300-700r/min, predetermined temperature can be 80-95 DEG C, in advance
Fixing time can be 5-8 hour.
It addition, the scheduled time 1 in reactions steps can be 30min, the scheduled time 2 can be 1-3 hour, predetermined
Can be 100mL.
On the other hand, the present invention provides the preparation side of a kind of wide distributed granule standard substance for calibrating particle size analyzer
Method, comprises the following steps: preparation process: styrene monomer, polyvinyl alcohol, initiator and cross-linking agent are put into lauryl sulphate acid
In sodium water solution, obtain mixed solution；Reactions steps: be passed through nitrogen gas stirring, is heated to predetermined temperature by mixed solution simultaneously, instead
Answer the scheduled time, take out washing, obtain crosslinked polystyrene particle；Separating step: crosslinked polystyrene particle is put into 12
Alkylsurfuric acid sodium water solution stirs the ultrasonic disperse scheduled time 1, settles the scheduled time 2, extract upper strata suspension predetermined,
Obtain crosslinked polystyrene subsample；With blend step: by the crosslinked polystyrene subsample different for particle diameter, the coefficient of variation is identical
Mixing, makes wide distributed granule standard substance.
Compared with prior art, beneficial effects of the present invention:
The wide distributed granule standard substance for calibrating particle size analyzer of the present invention, coefficient of variation phase different by particle diameter
Same crosslinked polystyrene subsample composition, it is possible to meet the demand of particle size analyzer testing calibration.
Accompanying drawing explanation
Fig. 1 is the preparation process flow chart of wide distributed granule standard substance.
Fig. 2 is the electron scanning micrograph of the 5-40 μm width distributed granule standard substance in embodiment 1.
Fig. 3 is the grain size distribution of 20-100 μm width distributed granule standard substance in embodiment 4.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, and described specific embodiment is the most right
The present invention explains, and is not limited to the present invention.
According to the embodiment of the present invention, present invention provide for calibrating the wide distributed granule reference material of particle size analyzer
Matter, wherein, the crosslinked polystyrene subsample that wide distributed granule standard substance is different by particle diameter, the coefficient of variation is identical forms, wide
The particle diameter distribution D90:D10 of distributed granule standard substance is 3.8-4.2.
In cumulative particle sizes scattergram, vertical coordinate is cumulative particle sizes distribution number 0%-100%, and abscissa is particle diameter.
D10 is exactly vertical coordinate cumulative particle sizes distribution number diameter value when being 10% corresponding to abscissa, and in like manner, D90 is exactly that vertical coordinate tires out
Count the diameter value corresponding to abscissa when particle size distribution number is 90%.
According to the embodiment of the present invention, the particle size range of wide distributed granule standard substance can be 5-100 μm.
According to the embodiment of the present invention, wide distributed granule standard substance can be by 6-18 kind particle diameter, the coefficient of variation
The crosslinked polystyrene subsample of 10%-20% is mixed.
Above-mentioned wide distributed granule standard substance can be made by step as shown in Figure 1: preparation process S110: by benzene second
Alkene monomer, polyvinyl alcohol, initiator and cross-linking agent are put in lauryl sodium sulfate aqueous solution, obtain mixed solution；Reaction step
Rapid S120: be passed through nitrogen gas stirring, is heated to predetermined temperature simultaneously by mixed solution, reacts the scheduled time, takes out washing, is handed over
Polystyrene granule；Separating step S130: crosslinked polystyrene particle is put in lauryl sodium sulfate aqueous solution and stir
The ultrasonic disperse scheduled time 1, settle the scheduled time 2, extraction upper strata suspension predetermined, obtain crosslinked polystyrene increment
Product；With blend step S140: particle diameter is different, the coefficient of variation is identical crosslinked polystyrene subsample mixing, make wide distribution
Particulate level material.The concentration of the lauryl sodium sulfate aqueous solution in separating step is identical with reactions steps.Such as, particle diameter is not
Can obtain in the following manner with, crosslinked polystyrene subsample that the coefficient of variation is identical: in separating step S130, every
1 hour, extract a upper strata suspension 100mL, obtain a kind of crosslinked polystyrene subsample, thus obtain particle diameter difference, become
The crosslinked polystyrene subsample that different coefficient is identical.
According to the embodiment of the present invention, the initiator in preparation process can be benzoyl peroxide, and cross-linking agent is permissible
For divinylbenzene.
According to the embodiment of the present invention, the lauryl sodium sulfate aqueous solution concentration in preparation process can be
0.25%-0.4%.
According to the embodiment of the present invention, the styrene monomer in preparation process and the body of lauryl sodium sulfate aqueous solution
Long-pending ratio can be 1:7-20, and polyvinyl alcohol can be 1:4-10 with the volume ratio of lauryl sodium sulfate aqueous solution, benzoyl peroxide
Formyl can be 1-5:100 with the mass ratio of styrene monomer, and divinylbenzene can be 1-with the mass ratio of styrene monomer
10:100。
According to the embodiment of the present invention, the stir speed (S.S.) in reactions steps can be 300-700r/min, predetermined temperature
Can be 80-95 DEG C, the scheduled time can be 5-8 hour.
According to the embodiment of the present invention, the scheduled time 1 in reactions steps can be 30min, and the scheduled time 2 can be
1-3 hour, predetermined can be 100mL.
According to the embodiment of the present invention, above-mentioned standard substance is reusable sample, is first surpassed by sample during use
Sound 1min, turn upside down bottle for several times, and first squeeze out 2-3 and drip to remove bottle mouth position residual particles.
According to another implementation of the invention, the present invention provides one to be as shown in Figure 1 used for calibrating granulometry
The preparation method of the wide distributed granule standard substance of instrument, comprises the following steps: preparation process S110: by styrene monomer, poly-second
Enol, initiator and cross-linking agent are put in lauryl sodium sulfate aqueous solution, obtain mixed solution；Reactions steps S120: be passed through
Nitrogen gas stirring, is heated to predetermined temperature simultaneously by mixed solution, reacts the scheduled time, takes out washing, obtains crosslinked polystyrene
Granule；Separating step S130: crosslinked polystyrene particle is put into stirring ultrasonic disperse in lauryl sodium sulfate aqueous solution pre-
Fix time 1, settle the scheduled time 2, extraction upper strata suspension predetermined, obtain crosslinked polystyrene subsample；And mixing step
Rapid S140: particle diameter is different, the coefficient of variation is identical crosslinked polystyrene subsample mixing, makes wide distributed granule reference material
Matter.For example, it is possible to be mixed in proportion.Such as, the crosslinked polystyrene subsample that particle diameter is different, the coefficient of variation is identical can pass through
In the following manner obtains: in separating step S130, every 1 hour, extracts a upper strata suspension 100mL, obtains a kind of crosslinking
Polystyrene subsample, thus obtain the crosslinked polystyrene subsample that particle diameter is different, the coefficient of variation is identical.Particle diameter is different, change
The crosslinked polystyrene subsample that different coefficient is identical can obtain in the following manner: in separating step S130, little every 3
Time, extract a upper strata suspension 100mL, obtain a kind of crosslinked polystyrene subsample, thus obtain particle diameter difference, Variation Lines
The crosslinked polystyrene subsample that number is identical.
The determination step of particle diameter volume distributed median and uncertainty thereof is as follows:
The granule number that first statistics increment records in each particle diameter section, calculates granule with the geometric mean diameter of each particle diameter section
Long-pending, the granule number of each particle diameter section is multiplied by corresponding particle volume and draws the cumulative volume of this particle diameter section granule, calculates each grain of increment accordingly
The percent by volume of footpath section；The percent by volume of increment each particle diameter section, is multiplied by this increment volume fraction in gross sample, draws this
Increment contribution to each particle diameter section in gross sample；The contribution of all increments is added up by corresponding each particle diameter section, obtains the volume of gross sample
Distribution.
Embodiment 1, the preparation of 5-40 μm width distributed granule standard substance
5-40 μm width distributed granule standard substance, its particle diameter distribution D90=34 μm, D10=8.3 μm.5-40 μm width is distributed
Particulate level material is to be mixed in proportion by the subsample that 8 kinds of coefficient of variation are 20% to form, its microphotograph such as Fig. 2 institute
Showing, its particle diameter is distributed as shown in Figure 3.Its mixed proportion is as shown in table 1 below.
Table 1
5-40 μm width distributed granule standard substance, its concrete preparation method is:
Preparation process: by 200mL styrene monomer, 500mL polyvinyl alcohol, the initiator mistake of styrene monomer quality 1%
The cross-linker divinylbenzene of BP and styrene monomer quality 10% puts into the 0.4% sodium lauryl sulphate water of 2L
In solution, obtain mixed solution；
Reactions steps: be passed through nitrogen gas stirring, stir speed (S.S.) is 500r/min, mixed solution is heated to 85 DEG C, instead simultaneously
Answer 6 hours, take out washing, obtain crosslinked polystyrene particle；
Separating step: crosslinked polystyrene particle is put into stirring in 0.4% lauryl sodium sulfate aqueous solution of 5L super
Sound dispersion 30min, often sedimentation 1 hour, extracts a upper strata suspension 100mL, extracts 8 times, obtain 8 kinds of polystyrene increments
Product.Fig. 2 is the electron scanning micrograph of the 5-40 μm width distributed granule standard substance of the present embodiment, as seen from the figure, this reality
Wide distributed granule standard substance prepared by the mode of executing exists the standard particle of 5-40 μm, and dispersion ratio is more uniform.
Method of analysis of variance (F analytic process) and meansigma methods consistency-checking method (t method of inspection) inspection the present embodiment is used to prepare
The uniformity of 5-40 μm width distributed granule standard substance and stability, it was demonstrated that its uniformity and having good stability.
5-40 μm width distributed granule standard substance particle diameter volume distributed median prepared by the present embodiment and the test of uncertainty thereof
Result such as table 2 below.
Table 2
Embodiment 2, the preparation of 5-40 μm width distributed granule standard substance
5-40 μm width distributed granule standard substance, its particle diameter distribution D90=30 μm, D10=7.7 μm.5-40 μm width is distributed
Particulate level material is to be mixed in proportion by the subsample that 6 kinds of coefficient of variation are 10% to form.Its mixed proportion is as shown in table 3 below.
Table 3
5-40 μm width distributed granule standard substance, its concrete preparation method is:
Preparation process: by 200mL styrene monomer, 140mL polyvinyl alcohol, the initiator mistake of styrene monomer quality 20%
The cross-linker divinylbenzene of BP and styrene monomer quality 1% puts into 0.25% sodium lauryl sulphate of 1.4L
In aqueous solution, obtain mixed solution；
Reactions steps: be passed through nitrogen gas stirring, stir speed (S.S.) is 300r/min, mixed solution is heated to 80 DEG C, instead simultaneously
Answer 5 hours, take out washing, obtain crosslinked polystyrene particle；
Separating step: crosslinked polystyrene particle is put into stirring in 0.25% lauryl sodium sulfate aqueous solution of 5L super
Sound dispersion 30min, often sedimentation 3 hours, extract a upper strata suspension 100mL, extract 6 times, obtain 6 kinds of polystyrene subsamples.
Method of analysis of variance (F analytic process) and meansigma methods consistency-checking method (t method of inspection) inspection the present embodiment is used to prepare
The uniformity of 5-40 μm width distributed granule standard substance and stability, it was demonstrated that its uniformity and having good stability.
5-40 μm width distributed granule standard substance particle diameter volume distributed median prepared by the present embodiment and the test of uncertainty thereof
Result such as table 4 below.
Table 4
Embodiment 3, the preparation of 5-40 μm width distributed granule standard substance
5-40 μm width distributed granule standard substance, its particle diameter distribution D90=36 μm, D10=9 μm.The distribution of 5-40 μm width
Grain standard substance is to be mixed in proportion by the subsample that 18 kinds of coefficient of variation are 15% that to form its mixed proportion as shown in table 5 below.
Table 5
5-40 μm width distributed granule standard substance, its concrete preparation method is:
Preparation process: by 200mL styrene monomer, 500mL polyvinyl alcohol, the initiator mistake of styrene monomer quality 1%
The cross-linker divinylbenzene of BP and styrene monomer quality 10% puts into the 0.3% sodium lauryl sulphate water of 4L
In solution, obtain mixed solution；
Reactions steps: be passed through nitrogen gas stirring, stir speed (S.S.) is 700r/min, mixed solution is heated to 95 DEG C, instead simultaneously
Answer 8 hours, take out washing, obtain crosslinked polystyrene particle；
Separating step: crosslinked polystyrene particle is put into stirring in 0.3% lauryl sodium sulfate aqueous solution of 5L super
Sound dispersion 30min, often sedimentation 2 hours, extract a upper strata suspension 100mL, extract 18 times, obtain 18 kinds of polystyrene subsamples.
Method of analysis of variance (F analytic process) and meansigma methods consistency-checking method (t method of inspection) inspection the present embodiment is used to prepare
The uniformity of 5-40 μm width distributed granule standard substance and stability, it was demonstrated that its uniformity and having good stability.
5-40 μm width distributed granule standard substance particle diameter volume distributed median prepared by the present embodiment and the test of uncertainty thereof
Result such as table 6 below.
Table 6
Embodiment 4, the preparation of 20-100 μm width distributed granule standard substance
20-100 μm width distributed granule standard substance, its particle diameter distribution D90=91 μm, D10=23 μm.20-100 μm width divides
Cloth particulate level material is to be mixed in proportion by the subsample that 10 kinds of coefficient of variation are 15% to form, its microphotograph such as Fig. 2
Shown in, its particle diameter is distributed as shown in Figure 3.Its mixed proportion is as shown in table 7 below.
Table 7
20-100 μm width distributed granule standard substance, its concrete preparation method is:
Preparation process: by 150mL styrene monomer, 300mL polyvinyl alcohol, the initiator mistake of styrene monomer quality 5%
The cross-linker divinylbenzene of BP and styrene monomer quality 4% puts into the 0.25% sodium lauryl sulphate water of 2L
In solution, obtain mixed solution；
Reactions steps: be passed through nitrogen gas stirring, stir speed (S.S.) is 500r/min, mixed solution is heated to 85 DEG C, instead simultaneously
Answer 6 hours, take out washing, obtain crosslinked polystyrene particle；
Separating step: crosslinked polystyrene particle is put into stirring in 0.25% lauryl sodium sulfate aqueous solution of 5L super
Sound dispersion 30min, often sedimentation 1 hour, extract upper strata suspension 100mL, obtain 10 kinds of polystyrene subsamples.Fig. 3 is for implementing
The grain size distribution of 20-100 μm width distributed granule standard substance in example 4, as seen from the figure, 20-100 μm width prepared by the present embodiment
Distributed granule standard substance presents normal distribution, and distribution is the widest, and its volume average particle size is about 57 μm.
Method of analysis of variance (F analytic process) and meansigma methods consistency-checking method (t method of inspection) inspection the present embodiment is used to prepare
The uniformity of 20-100 μm width distributed granule standard substance and stability, it was demonstrated that its uniformity and having good stability.
20-100 μm width distributed granule standard substance particle diameter volume distributed median prepared by the present embodiment and the survey of uncertainty thereof
Test result such as table 8 below.
Table 8
In sum, the uniformity of standard substance prepared by the present invention, stability and uncertainty all not only conform with for
The standard substance requirement of correction particle size analyzer, and meet the regulation of JJG 1006-1994 " primary standard material specification ".
Embodiments above is only used for that the present invention will be further described, it is impossible to be interpreted as scope
Limit.Any engineers and technicians being familiar with this field the present invention is done according to foregoing invention content some nonessential change
Enter and adjust, all should contain within protection scope of the present invention.
Claims (10)
1. for calibrating the wide distributed granule standard substance of particle size analyzer, wherein, described wide distributed granule standard substance is by grain
The crosslinked polystyrene subsample composition that footpath is different, the coefficient of variation is identical, the particle diameter distribution of described wide distributed granule standard substance
D90:D10 is 3.8-4.2.
Wide distributed granule standard substance the most according to claim 1, wherein, the particle diameter of described wide distributed granule standard substance
Scope is 5-100 μm.
Wide distributed granule standard substance the most according to claim 1, wherein, described wide distributed granule standard substance is by 6-18
Kind particle diameter, the coefficient of variation are that the crosslinked polystyrene subsample of 10%-20% is mixed.
Wide distributed granule standard substance the most according to claim 1, makes as follows:
Preparation process: styrene monomer, polyvinyl alcohol, initiator and cross-linking agent are put in lauryl sodium sulfate aqueous solution,
Obtain mixed solution；
Reactions steps: be passed through nitrogen gas stirring, is heated to predetermined temperature simultaneously by described mixed solution, reacts the scheduled time, takes out
Washing, obtains crosslinked polystyrene particle；
Separating step: described crosslinked polystyrene particle is put into stirring ultrasonic disperse in lauryl sodium sulfate aqueous solution and makes a reservation for
Time 1, settle the scheduled time 2, extraction upper strata suspension predetermined, obtain described crosslinked polystyrene subsample；With
Blend step: particle diameter is different, the coefficient of variation is identical described crosslinked polystyrene subsample mixing, makes described width and divides
Cloth particulate level material.
Wide distributed granule standard substance the most according to claim 4, the initiator in described preparation process is benzoyl peroxide
Formyl, cross-linking agent is divinylbenzene.
Wide distributed granule standard substance the most according to claim 4, the sodium lauryl sulphate water in described preparation process
Solution concentration is 0.25%-0.4%.
Wide distributed granule standard substance the most according to claim 4, the styrene monomer in described preparation process and 12
The volume ratio of alkylsurfuric acid sodium water solution is 1:7-20, and polyvinyl alcohol is 1:4-with the volume ratio of lauryl sodium sulfate aqueous solution
10, benzoyl peroxide is 1-5:100 with the mass ratio of styrene monomer, and divinylbenzene with the mass ratio of styrene monomer is
1-10:100。
Wide distributed granule standard substance the most according to claim 4, the stir speed (S.S.) in described reactions steps is 300-
700r/min, predetermined temperature is 80-95 DEG C, and the scheduled time is 5-8 hour.
Wide distributed granule standard substance the most according to claim 4, the scheduled time 1 in described reactions steps is 30min,
The scheduled time 2 is 1-3 hour, and predetermined is 100mL.
10., for calibrating a preparation method for the wide distributed granule standard substance of particle size analyzer, comprise the following steps:
Preparation process: styrene monomer, polyvinyl alcohol, initiator benzoyl peroxide and cross-linker divinylbenzene are put into ten
In sodium dialkyl sulfate aqueous solution, obtain mixed solution；
Reactions steps: be passed through nitrogen gas stirring, is heated to predetermined temperature simultaneously by described mixed solution, reacts the scheduled time, takes out
Washing, obtains crosslinked polystyrene particle；
Separating step: described crosslinked polystyrene particle is put into stirring ultrasonic disperse in lauryl sodium sulfate aqueous solution and makes a reservation for
Time 1, settle the scheduled time 2, extraction upper strata suspension predetermined, obtain described crosslinked polystyrene subsample；With
Blend step: particle diameter is different, the coefficient of variation is identical described crosslinked polystyrene subsample mixing, makes described width and divides
Cloth particulate level material.
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| CN108285506A (en) * | 2018-01-23 | 2018-07-17 | 北京海岸鸿蒙标准物质技术有限责任公司 | A kind of polymer turbidity standard substance nano-particle and preparation method thereof |
| CN108458992A (en) * | 2018-01-23 | 2018-08-28 | 北京海岸鸿蒙标准物质技术有限责任公司 | A kind of polymer suspension turbidity standard substance and preparation method thereof |
| CN108285506B (en) * | 2018-01-23 | 2020-05-22 | 北京海岸鸿蒙标准物质技术有限责任公司 | Nano particles for polymer turbidity standard substance and preparation method thereof |
| CN109655384A (en) * | 2019-01-29 | 2019-04-19 | 南开大学 | PM2.5Model particulate matter preparation method and model particulate matter |
| CN110609016A (en) * | 2019-06-10 | 2019-12-24 | 上海市计量测试技术研究院(中国上海测试中心、华东国家计量测试中心、上海市计量器具强制检定中心) | Standard substance for calibration and preparation method and application thereof |
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