Stop Contaminating Your Test Results If you're using distilled or deionized water for atomic absorption, liquid chromatography and other sensitive tests, chances are your test results are not accurate. Because distilled water ordinarily contains contaminants well above the sensitivity level of many modern analytical methods. For example, distilled water ordinarily contains many ppb of calcium carbonate whereas the sensitivity level for calcium by atomic absorption is 1 ppb. Stop contaminating your test results and install a Milli-Q System on your laboratory wall. It takes pretreated water from a still, D.I. system or reverse osmosis unit, and circulates it through a carbon column, D.I. columns and a final membrane filter. The water it produces is continuously on tap and free of all interfering contaminants; water that exceeds ACS and ASTM specifications for the highest quality reagent grade water. The quality is consistent; the cost is less than that of distilled; and there is practically no maintenance. For complete information on Milli-Q Systems write Millipore Corporation, Bedford, Mass. 01730. For immediate information, dial 800-225-1380, toll-free.
New Products
Automatic Viscometer Cannon's automatic capillary viscometer features wide viscosity range (20600 CS at 100°F), ASTM D445 precision, calculations by integral computer, automatic capillary selection and viscometer cleaning, and unattended operation. Company brochure gives full details. Cannon Instrument Co. 404
pH/mv Meter Model 133 five-digit research pH/mv meter features a 0-14 pH range readable to 1/1000 pH; and plus or minus millivolts from 0.0000 to 1.5000 V are readable to 0.0001 V. A glass/calomel electrode, electrode filling solution, electrode stand and holder, and instruction manual are included. Priced at $700. Kruger & Eckels, Inc. 419
Chlorine Monitor
Milli-Q™ Water Purification System
Chlortrol Model 30-500 is an all solidstate electronic instrument designed to provide a continuous indication of chlorine in water. Total residual chlorine is detected electrochemically. Up to 31 days of continuous readings are recorded on a built-in strip chart recorder. The instrument is available in two ranges: 0.03-1.0 ppm and 0.3-10 ppm chlorine by weight. Deltatec Corp. 420 For more information on listed items, circle the appropriate numbers on one of our R e a d e r s ' Service Cards
MILLIPORE® CIRCLE 152 ON READER SERVICE CARD 714 A · ANALYTICAL CHEMISTRY, VOL. 47, NO. 7, JUNE 1975
