The most versatile Recording Spectrophotometer available The Beckman DK T h e Beckman D K A u t o m a t i c Record i n g S p e c t r o p h o t o m e t e r h a s simplified a n d s p e e d e d work i n a n a l y t i c a l a n d research laboratories all over the world. Outstanding design plus a complete line of accessories make the D K one of the most valuable a n d versatile tools ever developed for t h e analytical chemist. T h e six curves show results of meas urements in six different applications using the Beckman D K a n d five of the D K accessories. Additional accessories are described a n d illustrated below.
REACTION RATE STUDIES - Records of absorption vs time at a single wavelength are useful for studies of chemi cal reactions, especially enzyme and hydrolysis studies. The DK-1 can run these studies without modification; an attachment is available to adapt the DK-2 to this application. Curve is 5-minute study of precipitation rate.
REPEAT SCANS —A flat-chart instrument like the DK-2 is ideal for comparing spectra changes as a reaction progresses. A repeat-scan attachment allows the DK-2 to scan a chosen wavelength region, then rescan it automatically over and over as the reaction progresses. Curves show methyl orange changing color through 2-5 pH range.
* Klir Die and Pellet Holder for pressing 11 iiii'li K B r pellets, popular fm infrared studies of solids.
-*• Dual Source Unit makeb possible the use of either a tungsten ur hvdrugen light source, simply b> turning a lever. Standard with an ν Hcckman D K - 1 or D K - 2 Spectrophotometer.
* Variable Pal h Cell whose length can he varied from 0 2~i to 10mm. fur equalizing solvent absorption in the double beam -sNstem. for obtaining readings in optimum absorb.mce re gion without trial dilution, etc
LINEAR WAVELENGTH RECORDING —Ara especially useful feature in strip-chart instruments is linear wavelength now standard on the DK-1. For flat-chart DK-2, there is a special linear wavelength accessory available. Curve is didymium. Note wavelength expansion in the near-infrared region.
LOWER ULTRAVIOLET STUDIES - Atmospheric
oxygen
in
the monochromator absorbs strongly below 204 ηιμ, reducing energy to the extent that studies in the lower ultraviolet become impractical. A purging kit to sweep gases from the monochromator is available. In this DK-2 curve, purging the monochromator increased available energy four times.
* Constant Temperature Cell Holder to hold measurement temperature for studies of reaction rates a n d tem perature-sensitive samples.
FLAME EMISSION RECORDING-Tfte DK-1
and DK-2
be
come recording emission spectrographs with addition of flame attachment. Flame spectra are excellent for fast qualitative work to show presence of metallic ele ments. This is flame spectrum of Fe. Note strong peak at 589 m/ί due to sodium impurity.
SPECIAL NEAR-INFRARED STUDIES—Purging is also
helpful
for special near-infrared studies —like this test of spe cially cooled lead sulfide cell —to achieve unusually high response at these far wavelengths. Note excellent resolution achieved with quartz prism in this region.
Your Beckman Dealer is a trained expert in the service and application of Beckman Recording Spectrophotometers — and h e stocks a complete line of D K ' s and their accessories. For further information, contact your dealer, or write Beckman Instruments, Inc., Scientific and Process Instruments Division, Fullerton, California. Ask for File L-59-15.
® Beckman Scientific and Process Instruments
Division
Beckman Instruments, Inc. 2500 Fullerton Road, Fullerton, California
We and our dealers are showing the newest Beckman analytical instruments at the Pittsburgh Conference, March 2-6.
