SCIENTIST'S BEST FRIEND
New Products Micro/Macro Melting Point Apparatus A new melting point apparatus pro vides a measuring range from 30° to 300°C for samples as small as 0.1 μ%. Observations may be made under transmitted, reflected, or polarized light. A unique prismatic viewing system per mits the sample and melting point tem perature to be observed simultaneously. The equipment has coarse and fine heat controls. Contained in a compact 12 in. long by 6 in. wide by ? 1 / 2 in. high steel cabinet with removable lid are the apparatus, polarizing filters, a 10X magnifier, and a 60X microscope. $360. National Instrument Co., Inc., 4119-4127 Fordleigh Rd., Baltimore, Md. 21215. 301-764-0900 421
for only $53 IWT gives you plain water Γ
h
Λ
A N ISCO GOLDEN RETRIEVER At home, man's best friend is his dog. But in the lab, it's an ISCO Golden Retriever f r a c t i o n col lector. Simple. Because and because the anism has j u s t parts. No chains, ratchets to wear synchronized.
it's solid state, shifting mech three moving levers, belts or or become un-
Easy to clean. The test tube racks are removable. And the drive mechanism can be easily lifted off the base and immersed in water or other solvents. The Golden Retriever is versatile too. It will hold any size tubes from 10 to 18 mm without adapt ers. It can retrieve f r o m two columns simultaneously. And it counts drops, m u l t i p l e siphon discharges or time intervals for each tube. Bring your best friend to the lab . . . the Golden Retriever from ISCO. Choose from two models. $695 and $850. Write for brochure FC31.
INSTRUMENTATION SPECIALTIES CO. ISCO
4 7 0 0 SUPERIOR LINCOLN, NEBRASKA 6 8 5 0 4 PHONE (402) 4 3 4 - 0 2 3 1 CABLE ISCOUU LINCOLN
Circle No. 65 on Readers' Service Card-
1O50 SOO00 S1050 Multiple anodic stripping analyzer MASA 2014 is an advanced, solid-state, elec trochemical instrument for fast routine trace metal analysis at the nanogram and subnanogram levels by anodic stripping voltammetry using composite mercury electrodes. The system is ca pable of performing 100-150 analyses per day for Zn, Cd, In, Pb, T l , Cu, Bi (air or water), and strong organic ligands for trace metals (EDTA, humic acids, and proteins) at the 10"* to 10"10M or 1 μ% to 0.1 ng level and can also be applied to the study of kinetics and formation constants of trace metal organic complexes. The cells have been designed for easy sample changing and are stirred with nitrogen to minimize contamination. $3950. Environmen tal Sciences Associates, Inc., 87 North St., Newtonville, Mass. 02160. 617527-2124 422
Very Plain: .04 parts per million solids and a resistance of 15 m e g o h m s per cc. Silica and C 0 2 a r e r e m o v e d . A t 5 g p h , y o u just can't g e t water any plainer o r purer. The IWT Duplex De-Ionizer shows an accurate color change o n t h e left (primary) cartridge w h i c h drops lower as t h e resin is exhausted. It tells (1) y o u have pure water; (2) a b o u t h o w long you'll g e t pure water (a c o n d u c t i v i t y meter c a n only tell y o u t h e instant t h e water is impure). For $12.50, y o u can switch t h e right cartridge to t h e left side and replace it with a n e w o n e o n t h e right. T h e n , y o u are right back w h e r e y o u started.
Bui. 268 is quite explicit about models, purity levels, resins, fixtures and costs. We would like to send you this 4-color, 4-page brochure — please ask for it.
Infrared Spectrophotometer The Model 157 ir spectrophotometer combines the optical design of the Model 137B with a flow chart record ing system. The instrument has an NaCl prism with a frequency range of 4000-650 c m - 1 . Operating controls are simple, and there are two scanning speeds: 1- and 5-min for a complete spectrum. Abscissa expansion of 2X
ILLINOIS WATER TREATMENT COMPANY 840 CEDAR ST., R0CKF0RD, ILLINOIS 61105
iwt Circle No. 63 on Readers' Service Card
96 A • ANALYTICAL CHEMISTRY, VOL. 42, NO. 7, JUNE 1970
