New Products Flow systems
Surface charge analyzer
The pH/ORP flow system has a 50-μΙ. flow capacity and uses the features of flat-surface combination electrodes for detection. The conductivity flow system features 25-μΙ_ flow capacity and is particularly suited for chromatography separation applications. Markson Science 410
Zetasizer II measures the surface charge on particles suspended in liquid media and analyzes their size distribu tion. It uses high-speed digital correla tion analysis of the light scattered by the particles as they move under the in fluence of an electric field. Size mea surement is based on analysis of Brownian motion of the particle. Applications include medical research and diagnos tics and studies of flocculation, rheology, and other surface-dependent phe nomena. Malvern 419
Autosampler Model 728 incorporates a microcompu ter for internal programming of individu al sample parameters. It can be used with any commercially available microbore, analytical, preparative, or single or multiloop HPLC autoinjector valve. No accessory gases are needed to ef fect sample transfer. Micrometrics 416
Chemicals Buffer reagent pack
H2S analyzer The instrument can detect 1 ppb H2S in a 5-s sample. Precision is ± 2 % at the 10-ppb H2S level. Selectivity of the gold film sensor eliminates interferences from hydrocarbons, CO2, SO2, and water vapor. Applications include anal ysis of natural gas and low-level ambi ent air, and control room monitoring. Jerome Instrument Corp. 417
IQ 190 DV sample processor can operate si multaneously as a plpet-diluter and a dis penser for volumes ranging from 1 μ ι to 10 mL. The microprocessor-controlled instrument can pick up a sample and multiple reagents and dispense them with two additional re agents. Applications include automating the handling of liquid reagents for RIA, EIA, and FIA. Cavro Scientific Instruments 402
We offer a full range of high-purity gases and mixtures. Whether you require specialty gases in small quantities for laboratory work, or in production volumes, Liquid Carbonic can meet your needs.
Specialty
Liquid has established a network of specialty gas laboratories and stocking depots throughout North America. Our laboratories are equipped with sophisticated analytical instruments and staffed by chemists and engineers ready to meet your needs for specialty gases and solve your problems.
Chemicals • • • •
Calibration Gas Standards High Purity Gases Electronic Gases Silanes
• • • •
Emission Gases Fluorocarbons Sterilizing Gases Research Gases
• Clinical Gases
Sulfide antioxidant buffer is designed for use with silver/sulfide electrodes. When added to standards and samples it prevents oxidation, frees sulfide ions from hydrogen ions, and adjusts ionic strength. Convenient reagent packs allow one-step mixing, save preparation time, and have a two-year shelf life when unopened. Orion Research 424
If quality and service are what you expect from a supplier, why not write to Liquid Carbonic for further information and a catalog.
LIQUID CARBONIC 135 SOUTH LA SALLE STREET · CHICAGO, ILLINOIS
«603
if 11' ii ι in ι ιιριιιι ι Î P B I H INC. 256 BRIMLEY RCAO. SCARBOnOUOH. ONTARIO. CANADA M1M 3J2
Send me your catalog and information on: Q Calibration Gases • Electronic Gases
D Emission Gases D Clinical Gases
D Equipment Ο Sterilizing Gases
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Π Have your local representative contact me. CIRCLE 129 ON READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 56, NO. 13, NOVEMBER 1984 · 1447 A
