CN1043816C - Atomic absorption spectrometry analysis with time resolution backgroud correction - Google Patents
Atomic absorption spectrometry analysis with time resolution backgroud correction Download PDFInfo
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- CN1043816C CN1043816C CN92112205A CN92112205A CN1043816C CN 1043816 C CN1043816 C CN 1043816C CN 92112205 A CN92112205 A CN 92112205A CN 92112205 A CN92112205 A CN 92112205A CN 1043816 C CN1043816 C CN 1043816C
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Abstract
The present invention relates to an atomic light absorption spectrometry analysis technique with time resolution background correction of single wavelength and double path. A double path time resolution technique is used for the first time, and optical signals of two different characters are obtained by using the same ordinary hollow cathode lamp on the same wavelength. Strong, narrow and stable element absorption lines are obtained on a path A, and non atomic absorption components which are used for background correction are obtained on a path B. Thus, capabilities of emissive strength, measurement sensitivity and background correction of the hollow cathode lamp are enhanced. The present invention has wide application values on departments, such as, medical care, environmental protection, metallurgy, geology, commodity inspection, universities, etc.
Description
The invention discloses a kind of time resolution background correction Atomic Absorption Spectrometer, belong to the metrology and measurement utensil.
Before the present invention made, measuring trace element method commonly used both at home and abroad mainly was GFAAS (graphite furnace atomic absorption spectrometry).This method must be carried out background correction exactly, otherwise just can not draw correct result.Wherein, utilization deuterium lamp background correction device, its light path adjustment trouble and light territory are narrow; Utilization Zeeman effect background correction need expensive supplementary instrument and electromagnet, and optical energy loss is big, and the possibility that produces the diadic working curve is arranged, because of undue background correction causes sample size negative value to occur; Utilization Shi Misi background correction, because the sensitivity for analysis of some elements is low, the element of practical application is restricted.Japan's no people wood is exerted oneself the dual wavelength time resolution method of Mr.'s invention, disturbs owing to can not get rid of spectrum, and sensitivity is low, can not be applied to the analysis of graphite furnace.At present, domestic and international employed Atomic Absorption Spectrometer device, element edge energy deficiencies such as ubiquity arsenic, caesium, problem such as baseline wander is big, and the hollow cathode lamp working current is big, and serviceable life is short.
The objective of the invention is to solve the modulation of source part of existing device, it can obtain two kinds of spectrum lines and different monochromatic pulses light that performance is different effectively, can improve the background correction ability significantly.
The object of the present invention is achieved like this: adopt single wavelength, binary channel to change the technology of spectral profile, thereby obtain two kinds of higher with lower spectrum lines that performance is different of sensitivity for analysis, comprise hollow cathode lamp, atomizer, monochromator, photomultiplier, amplification detection unit, logarithm converting unit, subtracter, data output unit, the pulse transmitter unit links to each other with hollow cathode lamp.One end control cathode lamp transmitting terminal of time resolution unit also is connected with the pulse transmitter unit, the other end is controlled the amplification detection end and is linked to each other with the amplification detection unit, is used to modulate hollow cathode lamp and makes two kinds of spectrum lines that performance is different of the interior acquisition of different time on its suitable wavelength.The pulse transmitter unit is modulated the single wavelength emission light that sends by applying pulse current, thereby is made same hollow cathode lamp send different monochromatic pulses light at different time from hollow cathode lamp.Photomultiplier is arranged on the exit slit of monochromator and with the amplification detection unit and links to each other, and the amplification detection unit links to each other with the logarithm converting unit, and the logarithm converting unit links to each other with subtracter, links to each other with the data output unit again.
The modulation of source system that the present invention makes, can make same the hollow cathode lamp spectrum line that two kinds of performances of acquisition are different in week simultaneously on suitable wavelength and send different monochromatic pulses light at different time, improve the emissive porwer of hollow cathode lamp and measured sensitivity, particularly improved the background correction ability significantly.
Detail of the present invention is provided by following examples.
Under the time resolution unit controls, the pulse transmitter unit is at first exported pulse current, excite hollow cathode lamp, make it send and be used for the light beam (being called A road sample analysis signal) that the sample device is analyzed, export pulse current constantly at another then, make hollow cathode lamp excite for the second time, generation is used for the light beam (being called B road background signal) of background correction, they alternately pass through atomizer, after entering the monochromator beam split, become the monochromatic light of identical wavelength, become electric signal through photomultiplier by light signal and enter the amplification detection unit.At this moment, the time resolution procedure control unit sends A, B two-way sampling instruction respectively, respectively two-way pulse absorption signal is sampled, take out sample analysis signal and background signal, the input logarithmic converter, become optical density signal AE and BE, AE and BE are subtracted each other, promptly finished time resolution background correction process through subtracter.
Claims (2)
1. time resolution background correction Atomic Absorption Spectrometer, adopt single wavelength, binary channel to change the technology of spectral profile, thereby obtain two kinds of higher with lower spectrum lines that performance is different of sensitivity for analysis, comprise hollow cathode lamp, atomizer, monochromator, photomultiplier, amplification detection unit, logarithm converting unit, subtracter, data output unit, the pulse transmitter unit links to each other with hollow cathode lamp, it is characterized in that device also comprises:
(1) time resolution unit, the one end is control cathode lamp transmitting terminal and is connected with the pulse transmitter unit, the other end is control amplification detection end and links to each other with the amplification detection unit, is used to modulate hollow cathode lamp and makes on its suitable wavelength two kinds of spectrum lines that performance is different of acquisition in the different time;
(2) pulse transmitter unit is modulated the single wavelength emission light that sends by applying pulse current from hollow cathode lamp, thereby makes same hollow cathode lamp not send different monochromatic pulses light simultaneously together.
2. one kind according to the described time resolution background correction of claim 1 Atomic Absorption Spectrometer, it is characterized in that: photomultiplier is arranged on the exit slit of monochromator and with the amplification detection unit and links to each other, the amplification detection unit links to each other with the logarithm converting unit, the logarithm converting unit links to each other with subtracter, links to each other with the data output unit again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92112205A CN1043816C (en) | 1992-12-04 | 1992-12-04 | Atomic absorption spectrometry analysis with time resolution backgroud correction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92112205A CN1043816C (en) | 1992-12-04 | 1992-12-04 | Atomic absorption spectrometry analysis with time resolution backgroud correction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1086601A CN1086601A (en) | 1994-05-11 |
| CN1043816C true CN1043816C (en) | 1999-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92112205A Expired - Fee Related CN1043816C (en) | 1992-12-04 | 1992-12-04 | Atomic absorption spectrometry analysis with time resolution backgroud correction |
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| Country | Link |
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| CN (1) | CN1043816C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090971B (en) * | 2013-01-24 | 2014-12-31 | 中国科学院空间科学与应用研究中心 | Ultra-sensitive time resolution imaging spectrometer and time resolution imaging method thereof |
| DE102013201459B4 (en) * | 2013-01-30 | 2017-01-05 | Siemens Aktiengesellschaft | Method for measuring the concentration of a gas component in a sample gas |
| CN104390913B (en) * | 2014-10-24 | 2017-10-20 | 上海光谱仪器有限公司 | A kind of frequency modulation(PFM) detection circuit being used for using xenon flash lamp as the Background Correction of Atomic Absorption Spectrometry of calibration light source |
| CN104390700B (en) * | 2014-10-24 | 2016-11-16 | 上海光谱仪器有限公司 | A kind of time-sharing approach testing circuit of xenon flash lamp Background Correction of Atomic Absorption Spectrometry |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU771481A1 (en) * | 1978-12-15 | 1980-10-15 | Предприятие П/Я А-7815 | Atom-absorbtion analysis method |
| SU991180A1 (en) * | 1981-09-04 | 1983-01-23 | Предприятие П/Я Р-6409 | Single-beam atomic absorption spectrophotometer having electrothermal atomizer |
| GB2141220A (en) * | 1983-06-06 | 1984-12-12 | Philips Electronic Associated | Atomic absorption spectrophotometer |
| CN2036663U (en) * | 1988-07-03 | 1989-04-26 | 地质矿产部北京地质仪器厂 | Flame type zeeman atomic absorption spectrophotometer |
| US5030006A (en) * | 1989-10-05 | 1991-07-09 | Slm Instruments, Inc. | Monochromator for single and multiplexed dual wavelength spectroscopy |
-
1992
- 1992-12-04 CN CN92112205A patent/CN1043816C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU771481A1 (en) * | 1978-12-15 | 1980-10-15 | Предприятие П/Я А-7815 | Atom-absorbtion analysis method |
| SU991180A1 (en) * | 1981-09-04 | 1983-01-23 | Предприятие П/Я Р-6409 | Single-beam atomic absorption spectrophotometer having electrothermal atomizer |
| GB2141220A (en) * | 1983-06-06 | 1984-12-12 | Philips Electronic Associated | Atomic absorption spectrophotometer |
| CN2036663U (en) * | 1988-07-03 | 1989-04-26 | 地质矿产部北京地质仪器厂 | Flame type zeeman atomic absorption spectrophotometer |
| US5030006A (en) * | 1989-10-05 | 1991-07-09 | Slm Instruments, Inc. | Monochromator for single and multiplexed dual wavelength spectroscopy |
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| Publication number | Publication date |
|---|---|
| CN1086601A (en) | 1994-05-11 |
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