Briefs
Riedel-deHaën
HYDRAMAL® Pyridine-free Karl Fischer reagents HYDRAMAL® is the trade name of a new generation of Karl Fischer reagents developed by Eugen Scholz in the last four years. These pyridine-free reagents are far superior to their "classic" counterparts. HYDRAMAL® offers a few important advantages: rapid titrations, stable end points, accurate results, and long shelf-life. The HYDRAMAL® product range has found worldwide acceptance. At the "Pittsburgh Conference 1 9 8 4 " the leading manufacturers of Karl Fischer titrators, like Metrohm, Mettler, Fisher Scientific or Hiranuma, presented their equipment using HYDRAMAL® reagents. ACS and U5P accept HYDRAMAL® as a KF reagent. Patents are pending in many countries, a few have been granted. HYDRAMAL® Composite is the one-component reagent with a shelf-life of more than two years. It is used like the "normal" KF reagents. The advantages are evident. The diagram shows that the titration of 4 0 mg water with HYDRAMAL® Composite takes only 4 minutes (curve B), whilst the old pyridine-containing reagent requires about 10 minutes (curve C). HYDRAMAL® Solvent and HYDRAMAL® Titrant are the two-component system. The most important feature is its superior accuracy. The titration of 4 0 mg water takes less than two minutes (see curve A). This reagent is absolutely stable and remains unchanged even during long storage periods.
Graphite-Furnace Atomic Absorption Method for Trace-Level Determination of Total Mercury 2617 Barbara J. Keller* and Mark E. Peden, Illinois State Water Survey, Analytical Chemistry Unit, Box 5050, Station A, Champaign, 111. 61820, and Anthony Rattonetti, Consultant in Atomic Spectroscopy, Suite 411, 55 Sutter Street, San Francisco, Calif. 94104 Anal. Chem., 56 (1984)
Determination and Optimization of Flow Rates in Vacuum Capillary Gas Chromatography 2618 Noel W. Davies, Central Science Laboratory, University of Tasmania, G.P.O. Box 252C, Hobart, Tasmania, Australia 7001 Anal. Chem., 56 (1984)
Microanalysis of Reaction Products in Sealed Tube Wet Air Oxidations by Capillary Gas Chromatography 2620 Margaret K. Conditt and Robert E. Sievers*, Cooperative Institute for Research in Environmental Sciences, Department of Chemistry, University of Colorado, Campus Box 215, and Campus Box 449, Boulder, Colo. 80309 Anal. Chem., 56 (1984)
Solvent Extraction of Molybdenum from Biological Samples and from Coal Fly Ash for Neutron Activation Analysis 2623 W. M. Mok, Henry Willmes, and C. M. Wai*, Department of Chemistry, University of Idaho, Moscow, Idaho 83843 Anal. Chem., 56 (1984)
Correction. Carbon Distribution In Coals and Coal Macérais by Cross Polarization Magic Angle Spinning Carbon-13 Nuclear Magnetic Resonance Spectrometry 2624 M. A. Wilson, R. J. Pugmire*, and Jirina Karas, Department of Fuels Engineering, University of Utah, Salt Lake City, Utah 84112, and L. B. Alemany, W. R. Woolfenden, and D. M. Grant, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, and P. H. Given, Materials Science Department, Pennsylvania State University, University Park, Pa. 16802
HYDRAMAL® Composite 5K, a special type, enables titration of water in both ketones and aldehydes at room temperatures. It can even be used for the highly reactive acetaldehyde. HYDRAMAL® Coulomat is the new reagent for the coulometric Karl Fischer titration. It offers the same advantages and can be applied to practically all coulometric titrators. The use of HYDRAMAL® reagents is in no way problematical. Practically all KF titrators are suitable, and the existing titration instructions can be used unchanged. The HYDRAMAL® brochure contains detailed recommendations for application. Please ask for free copies and samples. HYDRAMAL® reagents can be purchased all over the world. Kindly ask your reagent supplier for HYDRAMAL®, or contact
Riedel-de Haën Aktiengesellschaft Wunstorfer Str. 4 0 , D-3016 Seelze 1/Hannover Federal Republic of Germany
Telephone ( 5137) 7 07-1, Telefax (5137) 9 1 9 7 9 Telex9 2 1 2 9 5 r d h s d Abroad w e are represented by the sales organization of the Hoechst AG.
CIRCLE 179 ON READER SERVICE CARD 1396 A · ANALYTICAL CHEMISTRY, VOL. 56, NO. 13, NOVEMBER 1984
