Multielement flame spectroscopy

A computerized vidicon flame spectrometer is described along with Its application to a simultaneous determination of four serum electrolytes. Data acquisition, transfer, storage, and manipulation have been greatly improved by the computer addition. Operator input has been minimized while the programming has incorporated such features as automatic least-squares polynomial curve fitting, "spectral stripplng", background corrected peak signal measurements, and internal standard corrections.

Section: Resultsmentioning

confidence: 99%

Multielement atomic spectrometry with a computerized vidicon detector

Ganjei¹,

Howell²,

Roth³

et al. 1976

“…This concentration was determined by extrapolating a plot of the signal-to-noise ratio vs. concentration (for solutions whose concentrations were close to the detection limit) down to a signal-to-noise ratio of 2. These detection limits can no doubt be improved by using a faster monochromator, a silicon intensifier vidicon (1), and a shielded nitrous oxide burner.…”

Section: Resultsmentioning

confidence: 99%

“…To perform multielement flame spectrometry, a device capable of measuring intensities at different wavelengths is necessary-i.e., a multichannel device is necessary. Two major classes of multichannel systems are temporal multichannel devices and spatial multichannel devices (1). Temporal multichannel devices employ a single detector, where each channel is separated from the previous one in time.…”

mentioning

confidence: 99%

Vidicon tube as a detector for multielement flame spectrometric analysis

Busch¹,

Howell²,

Morrison³

1974

An instrument for multielement flame emission analysis is described which consists of a 0.5-m Ebert monochromator, a silicon diode vidicon tube, and an optical multichannel analyzer. Optical and electronic considerations of the system are discussed. Using this system, a spectral "window" of 20 nm is monitored simultaneously and atomic lines 1.4 A apart are resolvable. Detection limits, obtained under compromise flame conditions, are presented for Mo, Fe, Ca, Al, Ti, W, Mn, and K using spectral lines present in a single window. The multielement analysis of a geological standard rock sample for Fe, Ca, Al, and Ti is described, and the results are compared with the accepted valiles. Other potential windows for multielement analysis are presented.

“…The operational characteristics of the UV and SIT vidicon tubes and their control unit, the Optical Multichannel Analyzer (OMA), have been detailed in previous reports (3,7,12). Sensitivity comparison data were obtained in the real-time mode by enabling the real-time display switch on the OMA console.…”

Section: Methodsmentioning

confidence: 99%

“…Recent reviews have discussed the attributes of several new multichannel detector systems, and outlined their application to a variety of analytical techniques (1)(2)(3)(4)(5)(6). State-of-the-art multichannel detectors such as vidicons, photodiode arrays, charge coupled devices, etc.…”

mentioning

confidence: 99%

Evaluation of silicon vidicon detector sensitivity for atomic spectrometry applications

Howell¹,

Morrison²

1977

BurnerVarían Techtron 5-cm high solids slot burner for nitrous oxide-acetylene. External Plano-convex Supracil lens 5-cm diameter with 12.5-cm focal length stopped down to 2.6 cm. Polka dot beam splitter Optics 1 inch by 1.5 inches, Instrumentation Laboratories. Slits Jarrell-Ash Model 82-092 0-400µ dual unilateral entrance and exit slit assembly with straight jaws.Spectrometer Jarrell-Ash Model 82-020 0.5-m scanning Ebert Mount monochromator with Model 82-016 camera attachment and an 1180 grooves-per-millimeter grating blazed at 400 nm, providing a reciprocal linear dispersion of 1.6 nm/mm. Detectors Ultraviolet sensitized silicon vidicon tube assembly Model 1205 F, Princeton Applied Research Corp. Silicon Intensified Target vidicon tube assembly Model 1205D, with option-01 scintillator screen, Princeton Applied Research Corp. RCA 1P28 Photomultiplier tube, Radio Corporation of America Power supply High voltage dc supply, Model 412A, John Fluke Mfg. Co., Inc. Amplifier Keithley Model 417 High speed picoammeter, Keithley Instruments, Inc. OMA Optical Multichannel Analyzer Model 1205A, Princeton Applied Research Corp. Data Readout Tektronix Oscilloscope, Model 604 Monitor. Speedomax X/L 680 Dual Channel Strip Chart Recorder, Leeds and Northrup Co.Flow meters Brooks Full-view Rotameters calibrated for nitrous oxide and acetylene, Brooks Instrument Co. emission lines at 184.9, 253.6, 312.5, 365.0, 404.6, and 546.1 nm were sequentially monitored by both detection systems. Each spectral line was first observed on the vidicon tube. The intensity was adjusted, using a lens diaphragm and neutral density filters, to yield a real-time reading of 100 counts for the peak channel on the OMA. The entrance