JYH TechNote 25.qxp

ICP OPTICAL EMISSION SPECTROSCOPY
TECHNICAL NOTE 24
ICP Spectrometer Selection Criteria: ACTIVA and ULTIMA 2
HORIBA Jobin Yvon SAS, Longjumeau, France
For internal use only
Concept
Simultaneous analysis through a moving window of analysis called the Wavelength Analytical
View (WAV)
Sequential analysis through the use of a moving
grating and a fixed, single channel PMT detector.
Optical
Dispersive
System
The dispersive system of the ACTIVA is based
on a 0.64m Czerny-Turner optical mount,
with an innovative photon collector device,
the Achromatic Entrance Imager. Tthe exit slit
is eliminated and the single channel PMT detector
is replaced by a multi-channel CCD detector. A
several nm-large spectral window (WAV) is then
measured, which provides an abundance of spectral line and background information. A powerful,
dedicated preshot function allows the CCD detector to acquire truly simultaneous measurements of
a large number of line (and background) intensities across the WAV. Selection of a spectral window is performed according to its analytical interest, i.e. number of elements and/or number of
lines per element. Access to other regions of
interest is obtained by window jumping.
The dispersive system of the ULTIMA 2 is based
on the use of a 1.0 m Czerny-Turner monochromator. Wavelength selection is performed
through rotation of a plane grating. Selection of
the spectral bandpass is obtained by using narrow
entrance and exit slits, usually in the range 10-50
?m. Measurement of intensities at different wavelength locations is inherently in a sequential way.
As a consequence of the use of multi-channel
CCD detection, more information is obtained in
contrast to a monochromator, where only a single
line and its vicinity are examined. Acquisition of
large spectrum portions or even entire UV-visible
spectra is, then, possible. An ACTIVA ICP-based
spectra data base is available, and through
ACTIVAnalyst software tools, semi quantitative
analysis/fingerprint and multi-line quantitative
analysis may be conducted.
Photon detection is conducted with a single channel, photomultiplier tube (PMT). The ULTIMA 2
results from a long development within HJY and
has achieved a high maturity in terms of analytical
performance and software. The PMT remains an
unsurpassable detector in terms of wavelength
range, low noise, and inherent adjustable gain. A
PMT is easy to set-up and does not require any
cooling system.
Detection
System
Because the dispersive system works in a sequential way, optimization of the operating parameters,
power, carrier gas flow rate and integration time
can be obtained for a given element or group of
elements. The ULTIMA 2 is then highly suitable
for the determination of minor and trace elements in complex matrices, in particular with linerich matrices. The ULTIMA 2 can be then selected not only by laboratories with various and difficult analytical problems, but also by research laboratories.
ICP OPTICAL EMISSION SPECTROSCOPY
TECHNICAL NOTE 24
Performance
Limits of detection are excellent, including
those for lines below 190 nm, and comparable to
the competition. Total Plasma View is achieved by
the imaging of the entire height of the central plasma channel onto the full height of the detector.
Although slightly degraded compared to the ULTIMA 2, the 9-pm resolution is constant up to 440
nm and again is comparable to all solid state detector based ICP spectrometers available today.
The ULTIMA 2 exhibits the highest possible resolution in the range 165-300 nm, i.e. less than 5 pm.
This results from the 1-m focal length associated
with a 2400 lines/mm holographic grating working
in the 1st and 2nd order, and with narrow entrance
and exit slits. This high practical resolution makes it
possible to determine trace elements in line-rich
matrices (W, Co, Fe, REE...) without loss in sensitivity. Besides, such a high resolution provides a
high signal-to-background ratio, by minimizing the
contribution of the background below the line profile, thus providing the ultimate limits of detection of the HJY ICP systems. These excellent limits of detection are obtained by using the radial
viewing mode, and compete well with those
obtained by other manufacturers using the axial
viewing mode.
Limitations
Use of a CDD detector implies a camera and associated fast electronics, along with a cooling system,
which is more complex and costly than the set-up
of a PMT. Although slightly degraded compared to
the ULTIMA 2, the 9-pm resolution is constant up
to 440 nm.
The only ULTIMA 2 limitation is inherent to its
sequential principle. Usually, a single line per element is selected, and there is a need to scan the line
profile and the adjacent background to deduce the
net line intensity. Consequently, the determination
of a large number of elements per sample may be
time consuming.
Main
Features
• Full benefit of the available UV-visible information
o Availability of a comprehensive spectra
data base
o Dedicated software tools for efficient
semi quantitative and multi-line analysis
• Best possible practical resolution
• Best limits of detection
• Full flexibility in optimization
• Highly suitable for complex matrices
• Simultaneous measurements of line and background intensities within a spectral window
• Excellent and competitive LODs
• Full benefit of radial viewing through total plasma imaging
• Highly suitable for productive routine analysis
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ICP OPTICAL EMISSION SPECTROSCOPY
TECHNICAL NOTE 24
The ACTIVA is dedicated to productive routine
Key
Applications work for a large number of samples and ele-
The ULTIMA 2 is dedicated to any application
requiring the lowest possible detection limits
and/or the best optical resolution, i.e. in difficult, line rich matrices.
Markets
ments. Because of the use of multi-line analysis,
reliability of concentration measurements is
improved as it is possible to diagnose matrix spectral and non-spectral interferences.
•
Environmental
• Precious Metals
•
Production
• Rare Earths (REE)
•
Commercial Labs
• Nuclear
•
Oil Analysis
• Metals & Mining
•
WEEE/RoHS Compliance
• Semiconductor
•
QA/QC
• Materials Science
•
Utilities
• Research & Development
•
Any application requiring speed
• Academic
• Any application requiring the highest optical
resolution
In the USA:
HORIBA Jobin Yvon Inc.
3880 Park Avenue
Edison, NJ 08820
Tel: 1-732-494-8660
Fax: 1-732-494-8796
E-mail: [email protected]
1-866-JobinYvon
www.jobinyvon.com
In France:
HORIBA Jobin Yvon S.A.S.
16-18, rue du Canal
91165 Longjumeau Cedex
Tel: (33) 1/64 54 13 00
Fax: (33) 1/69 09 90 88
In Japan:
Horiba Ltd.
2 Miyanohigashi, Kisshoin
Minami-ku, Kyoto 601-8510
TEL: (81) 75 313 8121
FAX: (81) 75 321 5725
www.horiba.com
Germany: (49) 89/46 23 17-0
Italy: (39) 2/57 60 56 90
U.K.: (44) 20/82 04 81 42
China: (86) 10/6836 6542
Spain: (34) 91/724 16 57
Other Countries: Contact JY
S.A.S.
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