IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0958663
(2000-04-14)
|
우선권정보 |
NO-19991814 (1999-04-16) |
국제출원번호 |
PCT/NO00/00124
(2002-01-08)
|
§371/§102 date |
20020108
(20020108)
|
국제공개번호 |
WO00/63686
(2000-10-26)
|
발명자
/ 주소 |
- Schrøder, Knut H.
- Mikkelsen, Øyvind
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
2 |
초록
▼
The present invention concerns a method for improving the sensitivity in measurements when performing electrochemical analysis containing low metal concentrations and a means for performing electrochemical analysis. Ordinary stirring has to be avoided during the voltammetric scanning due to the low
The present invention concerns a method for improving the sensitivity in measurements when performing electrochemical analysis containing low metal concentrations and a means for performing electrochemical analysis. Ordinary stirring has to be avoided during the voltammetric scanning due to the low reproducibility when stirring takes place. A sound exposure, however, can be performed during the entire measurement, increasing the sensitivity. Further it is concluded that sound exposure close to the resonant frequency, has improvement effects at least comparable to stirring, and thus all mechanical stirring can be avoided. It is found that audible sound in the low frequency range, around 100 Hz is very effective for this purpose, with an increase of the analytical signal up to about 300%, without any significant increase in the corresponding noise level.
대표청구항
▼
1. A system for increasing sensitivity in an electrochemical analysis, said system comprising:an analysis cell; a plurality of electrodes arranged in said analysis cell; wherein said analysis cell is filled with a solution to be analyzed, wherein a measuring signal is produced as a consequence of a
1. A system for increasing sensitivity in an electrochemical analysis, said system comprising:an analysis cell; a plurality of electrodes arranged in said analysis cell; wherein said analysis cell is filled with a solution to be analyzed, wherein a measuring signal is produced as a consequence of a redox reaction at the electrodes, wherein the measuring signal is a measure of a concentration of a metal in the solution, wherein a sound source is arranged for generating sound waves in a frequency range of 20 to 1000 Hz, wherein the sound source is located in or adjacent to the analysis cell for producing sound waves therein, and wherein the production of sound waves increases a mass transport to the electrodes so as to increase the measuring signal without simultaneously increasing a noise level. 2. The system according to claim 1, wherein the sound source is arranged for generating sound waves with a frequency of about 100 Hz.3. The system according to claim 1, wherein the sound source is arranged for generating sound waves with mainly one frequency.4. The system according to claim 1, wherein the sound source is arranged for generating sound waves with several frequencies.5. The system according to claim 1, wherein the sound source is arranged for generating sound waves creating standing waves in the analysis cell.6. The system according to claim 1, wherein the sound source is arranged for generating sound waves putting the electrodes into resonance.7. The system according to claim 1, wherein the analysis cell has a cylindrical shape.8. The system according to claim 7,wherein the analysis cell has a cross-sectional diameter which is small compared to a wavelength of the sound waves such that the sound waves mainly propagate in parallel with a longitudinal direction of the analysis cell. 9. A method for increasing sensitivity in measurements when performing an electrochemical analysis, wherein a plurality of electrodes are arranged in an analysis cell filled with a solution to be analyzed, wherein a measuring signal is produced by the electrodes as a consequence of a redox reaction at the electrodes, and wherein the measuring signal is a measure of a concentration of a metal in the solution, said method comprising:generating sound waves in a frequency range of 20 to 1000 Hz in the analysis cell during measurements by a sound source which is arranged in or adjacent to the analysis cell, wherein said generating sound waves in the frequency range of 20 to 1000 Hz increases a mass transport to the electrodes so as to increase the measuring signal without simultaneously increasing a noise level. 10. The method according to claim 9, wherein the sound source generates sound waves with a frequency of about 100 Hz.11. The method according to claim 9, wherein the sound source generates sound waves with mainly one frequency.12. The method according to claim 9, wherein the sound source generates sound waves with several frequencies.13. The method according to claim 9, wherein the sound source generates standing waves in the analysis cell.14. The method according to claim 9, wherein the sound source generates sound waves putting the electrodes into resonance.15. The system according to claim 1, wherein the system is used in trace analysis of heavy metals.16. The system according to claim 15, wherein the heavy metals comprise one of Zn, Cd, Pb, and Cu.17. The system according to claim 1, wherein the electrochemical analysis comprises a in voltammetric analysis.18. The system according to claim 17, wherein the voltammetric analysis is a differential pulse anodic stripping voltammetry.19. The system according to claim 17, wherein the measuring electrode is of solid amalgam.20. The method according to claim 9, wherein the electrochemical analysis comprises a voltammetric analysis.
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