CN114264606A - Ultramicro cuvette - Google Patents
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- CN114264606A CN114264606A CN202111599907.0A CN202111599907A CN114264606A CN 114264606 A CN114264606 A CN 114264606A CN 202111599907 A CN202111599907 A CN 202111599907A CN 114264606 A CN114264606 A CN 114264606A
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- 239000010453 quartz Substances 0.000 claims abstract description 57
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000009833 condensation Methods 0.000 claims abstract description 12
- 230000005494 condensation Effects 0.000 claims abstract description 12
- 238000010183 spectrum analysis Methods 0.000 claims abstract description 7
- 239000011521 glass Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000523 sample Substances 0.000 description 29
- 230000000694 effects Effects 0.000 description 11
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- SGHZXLIDFTYFHQ-UHFFFAOYSA-L Brilliant Blue Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C(=CC=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 SGHZXLIDFTYFHQ-UHFFFAOYSA-L 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000002835 absorbance Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012086 standard solution Substances 0.000 description 3
- 239000012496 blank sample Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004451 qualitative analysis Methods 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
- 239000013074 reference sample Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000001055 blue pigment Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004204 optical analysis method Methods 0.000 description 1
- 238000005375 photometry Methods 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000005211 surface analysis Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000001052 yellow pigment Substances 0.000 description 1
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Abstract
The invention discloses an ultramicro cuvette, which comprises a cuvette, a capillary tube and a sample collecting device, wherein the cuvette is a hollow capillary tube and is used for absorbing a trace sample to be detected; the cuvette support is used for supporting the cuvette so as to perform spectral analysis on a sample to be detected. The cuvette support comprises a capillary channel, a cone light channel, a quartz cylinder channel and a cylindrical cavity. The capillary channel is hollow, is positioned in the center of the upper half part of the cuvette bracket and is communicated with the top of the cuvette bracket, and the inner diameter of the capillary channel is matched with the outer diameter of the capillary. The cone light channel is in a hollow cone shape and is respectively and oppositely arranged in front of and behind the middle part of the cuvette support to play a role in light condensation. The quartz cylinder channels are hollow cylinders, the number of the quartz cylinder channels is two, the quartz cylinder channels horizontally penetrate through the left side and the right side of the cuvette support and are communicated with the top end of the cone light channel, and the quartz cylinder channels are used for being inserted into the quartz cylinders so as to play a light condensation role. The cylindrical cavity is located in the center of the bottom of the cuvette holder, and the upper portion is in communication with the capillary channel for securing and preventing the capillary from contacting the holder wall.
Description
Technical Field
The invention relates to the technical field of instrument analysis, in particular to an ultra-micro cuvette.
Background
In recent years, with the development needs of life sciences, environmental sciences, new material sciences and the like, and the introduction of new technologies such as information sciences, computer technologies, biotechnology and the like, the means adopted by modern analytical chemistry is more and more diversified, and particularly, on the basis of adopting physical phenomena such as light, electricity, magnetism, heat, sound and the like, new achievements such as mathematics, computer science, biology and the like are further adopted to form a comprehensive science.
The optical analysis method is an important component of modern analytical chemistry, has superiority particularly in the aspects of research on material composition and structure, gene recognition, determination of geometric composition, surface analysis and the like, and is widely applied to various basic subject researches and emerging subject fields of life, environment, materials and the like. Spectral analysis is a mainstream method of optical analysis, and the application thereof is very important. Among them, the uv-vis spectrophotometer is widely used in laboratories and company detection departments in all universities as one of the most common analytical instruments. However, photometric analysis only consumes more than 3mL of sample (depending on the volume of the cuvette used) in one experiment, and is not suitable for precious samples in biochemical, environmental, medical and other directions, so how to reduce the sample usage while ensuring the detection accuracy becomes a feature of the patent.
Cuvettes are a type of instrument equipped for spectroscopic analysis. The cuvette is used for bearing a sample to be detected, light penetrates through a light transmission area bearing the sample in the cuvette, and information such as concentration of the sample is calculated by measuring transmittance. The micro cuvette is a micro optical cuvette for meeting the micro detection requirement (the sample volume is 0.01-0.1 mL). The ultra-micro cuvette further meets the detection requirement that the volume of the sample is less than 0.01mL, and can be used for detecting precious samples.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide an ultra-micro cuvette.
The present invention provides an ultra-micro cuvette having the following features: the cuvette is a hollow capillary tube and is used for absorbing a trace of sample to be detected; and the cuvette support is cuboid and is used for supporting the cuvette so as to perform spectral analysis on the sample to be detected. Wherein, the cuvette support comprises a capillary channel, a cone light channel, a quartz cylinder channel and a cylindrical cavity, the capillary channel is hollow, the capillary channel is positioned in the center of the upper half part of the cuvette support in the vertical direction and is communicated with the top of the cuvette support, the inner diameter of the capillary channel is matched with the outer diameter of the capillary, the cone light channel is in a hollow cone shape, the number of the capillary channel is two, the capillary channel and the cone light channel are respectively and oppositely arranged in front of and behind the middle part of the cuvette support, the bottom surfaces of the two cone light channels face outwards, the vertexes are opposite, the cone light channels are used for exerting the light condensation effect, the quartz cylinder channel is in a hollow cylinder shape, horizontally penetrates through the left side and the right side of the cuvette support, the number of the quartz cylinder channel is two, the quartz cylinder channel is respectively positioned at the inner sides of the vertexes of the two cone light channels and is communicated with the top end of the cone light channel, and the quartz cylinder channel is used for inserting a quartz cylinder so as to exert the light condensation effect, the vertical direction of cylindricality cavity is located the bottom central point of cell support the latter half, and upper portion is linked together with the capillary passageway for fixed capillary and prevent that capillary and support wall from contacting.
The ultra-micro cuvette according to the present invention may further have the following features: wherein, the capillary is made of glass or quartz.
The ultra-micro cuvette according to the present invention may further have the following features: wherein the inner diameter of the capillary is 50-250 μm, and the outer diameter is 360-380 μm.
The ultra-micro cuvette according to the present invention may further have the following features: wherein, the outer surface of the cuvette support is provided with a black coating.
The ultra-micro cuvette according to the present invention may further have the following features: wherein the inner diameter of the capillary channel is 360-380 μm.
The ultra-micro cuvette according to the present invention may further have the following features: the inner diameter of the quartz cylindrical channel is 2-6 mm, the diameter of the quartz column is 2-6 mm, and the diameter of the quartz column is matched with the inner diameter of the quartz cylindrical channel.
The ultra-micro cuvette according to the present invention may further have the following features: wherein the diameter of the bottom surface section of the cone light channel is 6-8 mm.
The ultra-micro cuvette according to the present invention may further have the following features: wherein the quartz cylindrical channel horizontally penetrates through the side surface of the cone light channel.
Action and Effect of the invention
The ultra-micro cuvette according to the present invention includes: the cuvette is a hollow capillary tube and is used for absorbing a trace of sample to be detected; and the cuvette support is cuboid and is used for supporting the cuvette so as to perform spectral analysis on the sample to be detected. Wherein, the cuvette support comprises a capillary channel, a cone light channel, a quartz cylinder channel and a cylindrical cavity, the capillary channel is hollow, the capillary channel is positioned in the center of the upper half part of the cuvette support in the vertical direction and is communicated with the top of the cuvette support, the inner diameter of the capillary channel is matched with the outer diameter of the capillary, the cone light channel is in a hollow cone shape, the number of the capillary channel is two, the capillary channel and the cone light channel are respectively and oppositely arranged in front of and behind the middle part of the cuvette support, the bottom surfaces of the two cone light channels face outwards, the vertexes are opposite, the cone light channels are used for exerting the light condensation effect, the quartz cylinder channel is in a hollow cylinder shape, horizontally penetrates through the left side and the right side of the cuvette support, the number of the quartz cylinder channel is two, the quartz cylinder channel is respectively positioned at the inner sides of the vertexes of the two cone light channels and is communicated with the top end of the cone light channel, and the quartz cylinder channel is used for inserting a quartz cylinder so as to exert the light condensation effect, the vertical direction of cylindricality cavity is located the bottom central point of cell support the latter half, and upper portion is linked together with the capillary passageway for fixed capillary and prevent that capillary and support wall from contacting.
Therefore, the ultramicro cuvette of the invention is based on a glass or quartz capillary tube, and controls the use amount of a sample within 1 mu L on the basis of ensuring the accuracy of qualitative and quantitative analysis of conventional ultraviolet-visible spectrophotometry.
In addition, the ultra-micro cuvette of the invention adopts the capillary as the optical area of the cuvette for the first time, which makes up the defect of large sample consumption of the conventional ultraviolet-visible spectrophotometer and greatly widens the sample concentration and the sample types which can be measured by the ultraviolet-visible spectrophotometry.
Finally, the ultramicro cuvette has extremely small sample demand and high upper limit of detection concentration, and the types and the sample concentration of samples to be detected are widened. And the preparation cost is low, and great convenience can be provided for the detection of trace components in the fields of biology, medicine and the like.
Drawings
FIG. 1 is a perspective view of an ultramicro cuvette in example 1 of the present invention;
FIG. 2 is a front view of an ultramicro cuvette in example 1 of the present invention
FIG. 3 is a side view of an ultra-micro cuvette according to example 1 of the present invention;
FIG. 4 is a standard curve diagram of a sunset yellow low concentration region in example 2 of the present invention;
FIG. 5 is a standard curve diagram of a sunset yellow high concentration region in example 2 of the present invention;
FIG. 6 is a graph of the UV-Vis absorption of brilliant blue in example 3 of the present invention;
fig. 7 is a standard graph of bright blue in example 3 of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement objects and the effects of the invention easy to understand, the following embodiments are provided to specifically describe the ultra-micro cuvette in combination with the accompanying drawings.
< example 1>
In this embodiment, an ultra-micro cuvette is provided.
FIG. 1 is a perspective view of an ultramicro cuvette in this example.
FIG. 2 is a front view of the ultra-micro cuvette according to the present embodiment.
FIG. 3 is a side view of the ultra-colorimetric cuvette in this embodiment.
As shown in fig. 1 to 3, an ultra-micro cuvette 100 according to the present embodiment includes a cuvette 10 and a cuvette holder 20.
The cuvette 10 is a hollow quartz capillary tube for sucking up a trace amount of a sample to be measured.
The cuvette holder 20 is rectangular and is used for holding the cuvette 10 so as to perform spectral analysis on a sample to be measured. The outer surface of the cuvette holder 20 is black coated to reduce the influence of stray light.
The cuvette holder 20 comprises a capillary channel 21, a cone light channel 22, a quartz cylinder channel 23 and a cylinder cavity 24.
The capillary channel 21 is hollow, is vertically positioned in the center of the upper half part of the cuvette support 20 and is communicated with the top of the cuvette support 20, and the inner diameter of the capillary channel 21 is matched with the outer diameter of the capillary.
The cone light channels 22 are hollow cones, the number of the cone light channels is two, the cone light channels are respectively and oppositely arranged in front of and behind the middle part of the cuvette support 20, the bottom surfaces of the two cone light channels 22 face outwards, the vertexes of the two cone light channels are opposite, and the cone light channels 22 are used for playing a role in light condensation.
The quartz cylindrical channels 23 are hollow cylinders, penetrate through the left side and the right side of the cuvette support 20 horizontally, are two in number, are respectively positioned on the inner sides of the vertexes of the two cone light channels 22 and are communicated with the top ends of the cone light channels 22, and the quartz cylindrical channels 23 are used for being inserted into quartz columns so as to play a role in light condensation.
The cylindrical cavity 24 is located at the bottom center of the lower half of the cuvette holder 20 in the vertical direction, and the upper part is communicated with the capillary channel 21 for holding the capillary and preventing the capillary from contacting the holder wall.
The operation of the ultra-micro cuvette 100 of the present embodiment is as follows:
in step S1, two quartz columns are inserted into the quartz cylinder passage 23.
In step S2, the capillary is inserted into the capillary passage 21, and baseline correction is performed in the uv-vis spectrophotometer.
And step S3, drawing out the corrected quartz capillary tube, inserting the quartz capillary tube into the sample to be detected, and sucking the sample by the capillary effect.
Step S4, keep the cuvette 10 clean on its surface, insert it into the capillary channel 21, ensure that the capillary bottom does not contact any position of the holder or instrument, and remain suspended.
And step S5, after the analysis is finished, the disposable quartz capillary tube is drawn out and thrown into a sharps box.
< example 2>
In this example, an application of the ultra-micro cuvette 100 of example 1 is provided. The sunset yellow standard curve was measured using the ultramicro cuvette 100 in example 1.
According to the model of an ultraviolet-visible spectrophotometer (Beijing Pujingyo general instrument, Limited liability company, TU-1901 double-beam ultraviolet-visible spectrophotometer), the bottom surface of the cone light channel 22 is recommended to have a diameter of 8mm, the quartz cylinder channels 23 on two sides have a diameter of 3mm, the distance between the two quartz cylinder cores is 5mm, and the distance between the through light holes and the bottom is 17.5 mm.
Firstly, 0.5000g of sunset yellow pigment is weighed in a 100mL volumetric flask and is subjected to constant volume by deionized water, so as to obtain a standard sunset yellow solution with the concentration of 5.000 mg/mL. Diluting to obtain solutions with gradient concentration of 0.04, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 mg/mL.
The samples were sequentially aspirated by a quartz capillary tube having an inner diameter of 250 μm to perform absorbance scanning. Calculated, the effective sampling quantity at each time is
Setting the reference sample as a blank sample, performing full spectrum scanning on the standard solution after baseline scanning (the wavelength scanning range is 350.0-600.0nm), and determining the maximum absorption wavelength of sunset yellow to be 480 nm. The gradient solution was scanned at 480nm in single point with reference to a microcuvette containing blank capillaries, and 5 sets of data for each concentration were collected and listed in table 1. Taking the mean value of each group of data, and making a working curve for the relative concentration to respectively obtain two fitting curves of high and low concentrations (fig. 4 and fig. 5).
Table 1 shows sunset yellow absorbance data (c)0＝5.000mg/mL)。
TABLE 1
FIG. 4 is a standard graph of the sunset yellow low concentration region in the present example.
Fig. 5 is a standard graph of the sunset yellow high concentration region in the present embodiment.
< example 3>
In this example, an application of the ultra-micro cuvette of example 1 is provided. The measurement of the brilliant blue standard curve was carried out using the ultramicro cuvette in example 1.
According to the model of an ultraviolet-visible spectrophotometer instrument (Shanghai prism light technology Co., Ltd., 1902PC ultraviolet-visible spectrophotometer), the bottom surface diameter of the cone light channel 22 is recommended to be 8mm, the diameter of the quartz cylinder channels 23 on the two sides is recommended to be 3mm, the distance between the two quartz cylinder cores is recommended to be 5mm, and the distance between the through light holes and the bottom is recommended to be 17.5 mm.
Firstly, 0.5086g of brilliant blue pigment is weighed in a 100mL volumetric flask and is subjected to constant volume by deionized water, so that a brilliant blue standard solution with the concentration of 5.086mg/mL is obtained. Diluting to obtain solutions with gradient concentration of 0.04, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 mg/mL.
The samples were sequentially aspirated by a quartz capillary tube having an inner diameter of 250 μm to perform absorbance scanning. Setting the reference sample as a blank sample, performing full spectrum scanning on the standard solution after baseline scanning (wavelength scanning range is 350.0-900.0nm) to obtain figure 6, and determining the maximum absorption wavelength of bright blue to be 630 nm. The gradient solution was scanned at 630nm in single point with reference to a microcuvette containing blank capillaries, and 5 sets of data for each concentration were collected and listed in table 2. The mean of each group of data was taken and the working curve was made for the relative concentrations to obtain the fitted curve (fig. 7).
Table 2 shows the brilliant blue absorbance data (c)0＝5.086mg/mL)。
TABLE 2
Fig. 6 is a graph showing the uv-vis absorption of the brilliant blue in this example.
Fig. 7 is a standard graph of bright blue in the present embodiment.
Effects and effects of the embodiments
The ultra-micro cuvette according to examples 1 to 3 includes: the cuvette is a hollow capillary tube and is used for absorbing a trace of sample to be detected; and the cuvette support is cuboid and is used for supporting the cuvette so as to perform spectral analysis on the sample to be detected. Wherein, the cuvette support comprises a capillary channel, a cone light channel, a quartz cylinder channel and a cylindrical cavity, the capillary channel is hollow, the capillary channel is positioned in the center of the upper half part of the cuvette support in the vertical direction and is communicated with the top of the cuvette support, the inner diameter of the capillary channel is matched with the outer diameter of the capillary, the cone light channel is in a hollow cone shape, the number of the capillary channel is two, the capillary channel and the cone light channel are respectively and oppositely arranged in front of and behind the middle part of the cuvette support, the bottom surfaces of the two cone light channels face outwards, the vertexes are opposite, the cone light channels are used for exerting the light condensation effect, the quartz cylinder channel is in a hollow cylinder shape, horizontally penetrates through the left side and the right side of the cuvette support, the number of the quartz cylinder channel is two, the quartz cylinder channel is respectively positioned at the inner sides of the vertexes of the two cone light channels and is communicated with the top end of the cone light channel, and the quartz cylinder channel is used for inserting a quartz cylinder so as to exert the light condensation effect, the vertical direction of cylindricality cavity is located the bottom central point of cell support the latter half, and upper portion is linked together with the capillary passageway for fixed capillary and prevent that capillary and support wall from contacting.
Therefore, the ultramicro cuvette in the above embodiment is based on a glass or quartz capillary, and the usage amount of the sample is controlled within 1 μ L on the basis of ensuring the accuracy of the qualitative and quantitative analysis of the conventional UV-visible spectrophotometry.
In addition, the ultramicro cuvette in the embodiment adopts the capillary as the optical area of the cuvette for the first time, so that the defect of large sample consumption of the conventional ultraviolet-visible spectrophotometer is overcome, and the sample concentration and the sample types which can be measured by the ultraviolet-visible spectrophotometry are greatly widened.
Finally, the ultramicro cuvette in the embodiment has extremely small sample demand and high upper limit of detection concentration, and the types and the sample concentration of the samples to be detected are widened. And the preparation cost is low, and great convenience can be provided for the detection of trace components in the fields of biology, medicine and the like.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (8)
1. An ultra-colorimetric cuvette comprising:
the cuvette is a hollow capillary tube and is used for absorbing a trace of sample to be detected; and
a cuvette support in a cuboid shape for supporting the cuvette to perform spectral analysis on the sample to be detected,
wherein the cuvette holder comprises a capillary channel, a cone light channel, a quartz cylinder channel and a cylinder cavity,
the capillary channel is hollow, is positioned in the center of the upper half part of the cuvette support in the vertical direction and is communicated with the top of the cuvette support, the inner diameter of the capillary channel is matched with the outer diameter of the capillary,
the cone light channels are hollow cones, the number of the cone light channels is two, the cone light channels are respectively and oppositely arranged in front of and behind the middle part of the cuvette support, the bottom surfaces of the two cone light channels face outwards, the vertexes of the two cone light channels are opposite, the cone light channels are used for playing a role in light condensation,
the quartz cylindrical channels are hollow cylinders, penetrate through the left side and the right side of the cuvette support horizontally, are two in number, are respectively positioned at the inner sides of the vertexes of the two cone light channels and are communicated with the top ends of the cone light channels, and are used for inserting quartz columns so as to play a role of light condensation,
the vertical direction of the cylindrical cavity is located in the center of the bottom of the lower half part of the cuvette support, and the upper part of the cylindrical cavity is communicated with the capillary channel and used for fixing the capillary and preventing the capillary from contacting with the support wall.
2. The ultra-colorimetric cuvette according to claim 1, wherein:
wherein, the capillary is made of glass or quartz.
3. The ultra-colorimetric cuvette according to claim 1, wherein:
wherein the inner diameter of the capillary tube is 50-250 μm, and the outer diameter is 360-380 μm.
4. The ultra-colorimetric cuvette according to claim 1, wherein:
wherein, the outer surface of the cuvette support is provided with a black coating.
5. The ultra-colorimetric cuvette according to claim 1, wherein:
wherein the inner diameter of the capillary channel is 360-380 μm.
6. The ultra-colorimetric cuvette according to claim 1, wherein:
wherein the inner diameter of the quartz cylindrical channel is 2-6 mm,
the diameter of the quartz column is 2-6 mm,
the diameter of the quartz column is matched with the inner diameter of the quartz cylinder channel.
7. The ultra-colorimetric cuvette according to claim 1, wherein:
the diameter of the bottom surface section of the cone light channel is 6-8 mm.
8. The ultra-colorimetric cuvette according to claim 1, wherein:
the quartz cylindrical channel horizontally penetrates through the side face of the cone light channel.
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| CN202111599907.0A CN114264606A (en) | 2021-12-24 | 2021-12-24 | Ultramicro cuvette |
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| CN202111599907.0A CN114264606A (en) | 2021-12-24 | 2021-12-24 | Ultramicro cuvette |
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| CN102680401A (en) * | 2012-05-21 | 2012-09-19 | 广西工学院 | Cuvette device |
| US20140099703A1 (en) * | 2012-10-05 | 2014-04-10 | William P Parker | Capillary Waveguide Cuvette |
| CN206673313U (en) * | 2017-04-07 | 2017-11-24 | 北京理工大学 | A kind of laser pump cavity for being used to keep the stable output of sun light pumped laser |
| CN214894829U (en) * | 2021-02-02 | 2021-11-26 | 浙江大学 | Micro-testing capillary device and spectrophotometer |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4991958A (en) * | 1989-07-10 | 1991-02-12 | General Atomics | Micropipette adaptor for spectrophotometers |
| DE3933592A1 (en) * | 1989-10-07 | 1991-04-18 | Kernforschungsz Karlsruhe | Spectral photometer - using specified source of radiation of light forced to luminescence by radioactive source of radiation |
| JPH0571757U (en) * | 1991-03-04 | 1993-09-28 | 日本石英硝子株式会社 | Concentrating cell for ultra-trace sample spectrophotometry and its holder |
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