CHICAGO
changed the direction of its
river's flow to stem the pollution of Lake Michigan, its water supply. N o w t h e u r b a n s c e n e is threatened with many kinds of pollution . . . a n d u r b a n a n d rural areas alike are involved in new methods of • clean-tip • conservation • re-use of resources. Chemists and Chemical Engineers are important contributors to environmental research and technical developments. Read about practical applications . . . theoretical studies . . . important surveys of scientific — industrial — governmental a c t i v i t y in e n v i r o n m e n t a l control from the chemical point of view . . . Subscribe to the monthly ENVIRONMENTAL SCIENCE & TECHNOLOGY 1 Year: ACS Members $5.00 All others... $7.00 POSTAL CHARGES: none Domestic $3.00 PUAS & Canada $ 3 . 5 0 Foreign To order send name, title or address (including zip code) to:
Environmental science and Dept. Technology
if you use any of these gases SEND FOR NEW SPECIALTY GASES & EQUIPMENT CATALOG FROM AIR PRODUCTS Acetylene Air Aliène Ammonia Argon
Deuterium Dimethylamine Dimethyl Ether 2,2-Dimethylpropane Doping Gases
Boron Trichloride Boron Trifluoride Bromine Pentafluoride Bromine Trifluoride Bromotrifluoroethylene 1,3 Butadiene Butane 1-Butene cis-2-Butene trans-2-Butene
Ethane Ethyl Acetylene Ethyl Chloride Ethyl Fluoride Ethylene Ethylene Oxide Fluorine
Halocarbon— 11, 12, 13, 13B1, cis- and trans-2-Butene 14, 21, 22, 23, 113, 114, 114B2, 115, Carbon Dioxide 116, 142B, 152A, Carbon Monoxide C-318, 1132A Carbonyl Fluoride Helium Carbonyl Sulfide Carrier Gases Chlorine Chlorine Trifluoride Chlorotrifluoroethylene Cyanogen Cyclopropane
Hexafluoropropene Hydrogen Hydrogen Bromide Hydrogen Chloride Hydrogen Fluoride Hydrogen Iodide Hydrogen Sulfide
Iodine Pentafluoride 1,3 Pentadiene Isobutane Perfluorobutene-2 Isobutylene Perfluoropropane Phosgene Krypton Phosphine Phosphorus Pentafluoride Methane Propane Methyl Acetylene Propylene Methyl Bromide 2-Methylbutene-l Research Grade Gases 2-Methylbutene-2 Silane 3-Methylbutene-l Silicon Tetrafluoride Methyl Chloride Sulfur Dioxide Methyl Fluoride Sulfur Hexafluoride Methyl Mercaptan Sulfur Tetrafluoride Monoethylamine Sulfuryl Fluoride Monomethylamine Neon Nickel Carbonyl Nitric Oxide Nitrogen Nitrogen Dioxide Nitrogen Trifluoride Nitrogen Trioxide Nitrosyl Chloride Nitrous Oxide
Tetrafluorohydrazine Trifluoromethyliodide Trimethylamine Vinyl Vinyl Vinyl Vinyl
Bromide Chloride Fluoride Methyl Ether
Xenon
Oxygen Zero Gases . . Plus customer specified gas mixtures and a complete line of regulators, valves, flowmeters arid other accessory equipment. (Detach and mail this convenient order form today)
position,
Air Products and Chemicals, Inc. Specialty Gas Department AC-40 733 W. Broad Street, Emmaus, Pennsylvania 18049 Please send new 104-page Specialty Gases and Equipment Catalog No. 5068 listing the industry's largest selection of specialty gases, gas mixtures, and gas handling equipment . . . available nationally from convenient stock points and 65 district offices.
B
AMERICAN CHEMICAL SOCIETY 1155 Sixteenth Street, N.W. Washington, D.C. 20036 Please indicate whether you are an ACS member, and if you are, please use address in which your membership is recorded. You may enclose your check or ask to be billed later. Be sure to add postal costs where applicable.
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Total Capability and Product
Integrity
Circle No. 14 on Readers' Service Card
ANALYTICAL CHEMISTRY, VOL. 42, NO. 5, APRIL 1970
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