Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1998-02-26
2000-09-19
Font, Frank G.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
G01J 330
Patent
active
061220507
ABSTRACT:
The device disclosed herein is useful in the development of a new plasma spectrometer with enhanced sensitivity. An alteration in the configuration of the optic lenses used in conjunction with a water-cooled disc allows for the use of a short depth of focus to more reliably sample a given analyte. The collimating lens used in this invention can be placed within 4 millimeters of the load coil, including in the tip of the axial plasma generated by the RF generator. When used with in conjunction with a high-efficiency nebulizer to more precisely control the size of the sample droplets present in the base of the plasma further reduces the matrix effects seen in other spectrometers, while enhancing sensitivity. The optics configuration disclosed in the instant invention allows for the retrofitting of a conventional radially-viewed plasma spectrometer into a more sensitive axially-viewed spectrometer. The optics configuration can also be used to either enhance the sensitivity of existing spectrometers, or as a substitute for new ICP-OES systems to reduce their matrix effects as well. The typical spectrometer for which this change in configuration would be most useful would be an inductively coupled argon plasma-optical emission spectrometer (ICP-OES), in which the analyte studied can be sectioned axially.
REFERENCES:
patent: 4871580 (1989-10-01), Schram et al.
patent: 4902099 (1990-02-01), Okamoto et al.
patent: 4955717 (1990-09-01), Henderson
patent: 4999492 (1991-03-01), Nakagawa
patent: 5298743 (1994-03-01), Kato
patent: 5383019 (1995-01-01), Farrell et al.
patent: 5436723 (1995-07-01), Kunselman et al.
patent: 5495107 (1996-02-01), Hu et al.
patent: 5506149 (1996-04-01), Crawford et al.
patent: 5534998 (1996-07-01), Eastgate et al.
patent: 5565679 (1996-10-01), Tanner et al.
patent: 5642190 (1997-06-01), Krupa et al.
patent: 5841531 (1998-11-01), Gliddon
Faires, L. et al, 1985, "Top-Down" Versus "Side-On" Viewing of the Inductively Coupled Plasma, Appl. Spectroscopy, vol. 39, No. 1, pp 5-9.
Montaser, A. et al, 1982, Atomic Emission Spectrometry with a Skimmed Inductively Coupled AR Plasma, Appl. Spectroscope, vol. 36, No. 4, pp 454-459.
Demers, D., 1979, "Evaluation of the Axially Viewed (End-on) Inductively Coupled Argon Plasma Source for Atomic Emission Spectroscopy", Appl. Spectroscopy, Vo 33, No. 6, pp 584-591.
Blades, M. et al, 1980, "Photodiode Array Measurement System for Implementing Abel Inversions on Emission from an Inductively Coupled Plasma" Appl. Spectroscopy, vol. 34, No: 6, pp 696-69.
Ivaldi, J. et al, 1996, "Real-time internal standardization with an axially-viewed inductively coupled plasma for optical emission spectrometry", Spectrochimica Acta Part B 51, pp 1443-1450.
Cleland, T. et al, 1996, "Statistical mechanics of Ar.sub.2 in an inductively coupled plasma", Spectrochimica Acta Part B 51, pp 1487-1490.
Davies, J. et al, 1985, "Axial View of an Inductively Coupled Plasma", Analyst, pp. 535-540.
M. W. Blades and M G. Horlik, 1981 1CP3 The Vertical Spatial Characteristics of Analyte Emission in the Inductively Coupled Plasma, Spectrochim. Acta, 3611, No. 9 pp. 861-880.
M. W. Blades and M G. Horlick, 1981 1CP 4 Interference From Easily Ionizable Element Matrices in Inductively Coupled Plasma Emission Spectrometry--A Spatial Study, 10 Spectrochimica Acta., 36B, No. 9 pp. 881-900.
M. W. Blades and C. B. L., 1985 1CP 18 Exitation Temperature and Electron Density m the Inductively Coupled Plasma-Aqueous vs. Organic Solvent Introduction, Spectrochim. Acta., 40B, No. 4 pp. 579-591.
P. W. J. M. Bournans, 1982 1CP 29 Comment on a Proposed Excitation Mechanism in is Argon 1CPs, Spectrochim. Acta., 3711 pp. 75-82.
B. L. Caughlin and B. M. W., 1984 1CP 36, An evaluation of Ion-Atom Emission Intensity Ratios and Local Thermodynamic equilibrium in an Inductively Coupled Plasma, Spectrochim. Acta., 39, No. 12 pp. 1583-1602.
B. L. Caughlin and M. W. Blades, 1985 ICP 37 Analyte Ionization in the Inductively 20 Coupled Plasma, Spectrochim. Acta., 40B, 10-12 pp. 1539-1554.
J. Davies and B.. D. Snook, 1986 1CP 24 Spatial Emission Characteristics and Excition Mechanisms in the Inductively Coupled Plasma, J. Anal. At. Spectrom., 1, Oct. 25 pp. 325-330.
C. Dubuisson,, E. Poussel and L.M. Mermet, 1997 1CP 31 Comparison of Axially and Radially Viewed Inductively Coupled Plasma Atomic Emission Spectrometry in Terms of Signal-to-Background Ratio and Matrix Effects, J. Anal. At. Spectrom., 12, Mar. pp. 281-286.
N. Furuta and C. Horlick, 1982 1CP 11 Spatial Characterization of Analyte Emission and Excitation Temperature in an Inductively Coupled Plasma, Spectrochim. Acta., 37B, No. 1 pp. 53-64.
P. J. Galley and C. M. Hieftje, 1994 ICP 19 Easily Ionizable Element (EIE) Interferences in Inductively Coupled Plasma Atomic Emission Spectrometry-11. Minimization of ME Effects By Choice of Observation Volume, Spectrochim Acta., 49B, No. 7 pp. 703-724.
W. H. Gunter, K. Visser and ZY.B., 1982 1CP 16 Some Aspects of Matrix Interference Caused by elements of Low Ionization Potential in Inductively Coupled Plasma Atomic Emission Spectrometry, Spectrochim. Acta., 3713, No. 7 pp. 571-581.
T. Hasegawa and H. Haraguchi, 1985 1CP 35 A Collisional-Radiative Model is Including Radiation Trapping and Transport Phenomenafor Diagnostics of an Inductively Coupled Argon Plasma, Spectrochim. Acta., 40B, 10-12 pp. 1505-1515.
G. M. Hiefte, G. D. Rayson and J. W. Olesik, 1985 1CP 10, A Steady-State Approach to Exitation Mechanism in the ICP, Spectrochim. Acta., 40B, Nos. 1/2 pp. 167-176.
G. M. Hiefte, 1996 ICP 22 The Future of Plasma Spectrochemical Instrumentation, J. Anal. At. Spectrom., 11, Sep. pp. 613-621.
G. Horlick and N. Foruta, 1982 1CP 8 Spectrographic Observation of the Emission Structure of the Inductively Coupled Plasma Spectrochimica Acta., 3 7B, No. 11 pp. 999-1008.
M. Huang and L. Keling, 1986 1CP 1 Decay of an Inductively Coupled Argon Plasma Above the Load Coil, J. Anal. At. Spectrom., 1, Apr. pp. 153 to 156.
E.B.M. Janseri and D. R. Demers, 1985 1CP 33 Hollow-Cathode Lamp-Excited Inductively Coupled Plasma Atomic-Fluorescence Spectrometry: Performance Under Compromise Conditions For Simultaneous Multi-Element Analysis, Analyst, 110, May, pp. 541-545.
T. C. Johnston, R. S. Perry, L. J. Fick and H. B. Fannin, 1997 1CP 32 An Examination 35 of Relative Trends of Atomic Detection Limits in the Inductively Coupled Plasma, Spectrochim. Acta., B 52, pp. 125-129.
B. R. LaFreniexe, D. R. Wiederin, V. A. Fassel and R. S. Houk, 1996 1CP 13 Molecular Hydrogen Emission in the Vacuum Ultraviolet From an Inductively Coupled Plasma, Spectrochimica Acta, 5 1B, pp. 3-12.
G. F. Larson, It. A. Fassel, R. H. Scott and R. N. Kniseley, 1975 1CP 9 Inductively 5 Coupled Plasma--Optical Emission Analytical Spectrometry: A Study of Some Inter-element Effects, Anal. Chem., 47, No. 2 pp. 23 8-243.
JM. Mermet and E. Poussel, 1995 1CP 21 1CP Emission Spectrometers: 1995 Analytical Figures of Merit, Appl. Spectrosc., 49, No. 10 pp. 12a-18a.
G. P. Miller, '1991 1CP 39 A Methodfor Observing Changes in Radiative Losses From and Inductively y Coupled Argon Plasma, Spectrochim. Acta., 4613, No. 9 pp. 1253-1262.
J. Mostaghimi, P. Proulx and M. 1. Boulos, 1985 1CP 12 Computer Modeling of the Emission Patterns for a Spectrochemical ICP, Spectrochim. Acta., 40B, Nos. 1/2 pp. 153-166.
Novonty, J. C. Farinas, W. Jia-ling, E. Poussel and J. M. Mermet, 1996 1CP 34 Effect Of Power and Carrier Gas Flow Rate on the Tolerance to Water Loading in Inductive4y Coupled Plasma Atomic Emission Spectrometty, Spectrochim. Acta., 20 51B, pp. 1517-1526.
K. O'Hanlon, L. Ebdon and M. Foulkes, 1997 1CP 26 Effect of Easily lonisable Elements on the Mass Transport of Solutions and Slurries Used in Plasma Emission.5pectrometry, J. Anal. At. Spectrom., 12, Mar. pp. 329-331.
J. W. Olesik, J. A. Kinzer and B. Harkleroad, 1994 1CP 38 Inductively Coupled 25 Plasma Optical Emission Spectrometry Using Nebulizers with Widely Different Sample Consumption Rates, Anal. Chem., 66, No. 13, Jul. 1 pp. 2022-2030.
L. Paama, L. Piiri, P. Peramaki and L. H. Lajunen, 1995 1CP 20
Cornell Research Foundation Inc.
Font Frank G.
Smith Zandra
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