ATOMIC ABSORPTION SPECTROMETRY continued
Lamp type An important consideration in selecting an AAS is the choice of lamp.
Generally, a diff erent lamp is used for each element, and a few elements may be combined in a multielement lamp. Consideration must be given to the wavelength that provides the best sensitivity and to the intensity of the emission line.
The 205AAS from Buck Scientifi c provides two hollow cathode lamps.
The AA-6200 from Shimadzu has a six-lamp turret with hollow cathode and deuterium lamps.
The 240ZAA and the 280Z AA from Agilent Technologies have a single light source with eight fi xed lamp positions.
Background absorption An important factor in selecting an AAS is the method used for cor- recting background absorption, which aff ects the detection limits of the AAS.
The AA-6200 from Shimadzu off ers the D2 SR and D2 methods.
method, and the AA-7000 the
The iCE™ 3400 from Thermo Fisher Scientifi c and the PinAAcle from PerkinElmer off er the D2
and Zeeman methods. Customization
The availability of customization options should be taken into account as well.
The 240 AA from Agilent Technologies comes with the optional vapor generation accessories VGA 77 and ETC 60 for the analysis of mercury and hydrides.
The AA-7000F from Shimadzu is supplied with the optional AAC-7000 Auto Atomizer Changer, which creates capability for both fl ame and fur- nace analysis without changing the atomizer.
Representative AAS • Agilent Technologies: 240 AA, 240 FS AA, 240Z AA, 280FS AA, 280Z
AA, 55B AA, AA Duo
• Analytik Jena: contrAA® series (300, 600, 700), novAA® series (350, 400P), ZEEnit series (650 P, 700 P), solid AA®
• Angstrom Advanced Inc.: AAS320N • Aurora Biomed Inc.: TRACE AI1200, TRACE 1300, TRACE 1800 • Buck Scientifi c: 205AAS, 210VGP, Accusys 211
• GBC Scientifi c Equipment: SavantAA Zeeman, SavantAA AAS, SavantAA Σ AAS, SensAA, XplorAA
• Labnics Equipment: LAAS-210, LAAS-320, LAAS-810, LAAS-990, LAAS A Series (110A, 120A, 130A), LAAS B Series (110B, 120B, 130B)
• PerkinElmer Inc.: AAnalyst™ 200, AAnalyst 400, PinAAcle™ 900F, PinAAcle 900Z, PinAAcle 900H, PinAAcle 900T
• PG Instruments Ltd.: AA500G, AA500F, AA500FG, AA990F
• Qualitest International Inc.: WFX-110A/120A/130A, WFX- 110/120/130, WFX-210, WFX-320
• SAFAS S.A.: AA 191, AA 181, AA 170 • Shimadzu: AA-6200, AA-7000 • Spectrolab Systems: S-990F, S-990G, S-990FG • Thermo Fisher Scientifi c: ICE™ 3300, ICE 3400, ICE 3500
• U-Term International (H.K.) Ltd.: ST-AAS-01, ST-AAS-02, ST-AAS-03, ST-AAS-7002
DUAL INVERTED SELECTIVE PLANE ILLUMINATION MICROSCOPY
ASI has developed a new form of light sheet microscopy with our collaborators. The system utilizes two water emersion objectives mounted at 45 degree angles above the sample on an inverted microscope, a third objective also can be used to view the sample from below. The top objectives are mounted on piezo positioning devices so precise image stacks can be obtained.
For More Information Visit:
www.asiimaging.com Email:
info@asiimaging.com Call: (800) 706-2284 or (541) 461-8181
Going forward Customization options provide important features to improve on detec-
tion limits and provide for a wider spectrum of elements analyzed.
Providers A list of providers of AAS is given in Table 1. For more information, please
visit
www.labcompare.com.
Lina Genovesi, Ph.D., JD, is a Technical, Healthcare, and Business Writer based in Princeton, NJ; e-mail:
lina.genovesi@
gmail.com; www.
linagenovesi.com
AMERICAN LABORATORY • 36 • SEPTEMBER 2014
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