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THE NEW PERKIN-ELMER MODEL 212C SORPTOMETER reduces-by as much as 75%—the time required to secure complete data for measurement of surface areas by the standard B-E-T method. The use of pre-mixed gases simplifies and stabilizes the operation

of this compact and rugged instrument. No complex vacuum systems or glassware are re­

quired to make highly accurate determinations. Samples as small as 0.02 to 0.04 gram can be handled, and surfaces varying from as low as 0.1 square meter per gram to as high as 1000 square meters per gram. Results appear as peaks on a chart which may be retained as a permanent record. The Model 212C, originated by Shell Development Company and manufactured under exclusive license by Perkin-Elmer, also measures pore volumes and pore size distribution. For details, write Instrument Division, Perkin-Elmer Corporation, 751 Main Avenue, Norwalk, Connecticut.

Product Capsules

Refractometers. For testing alcohols or extra dense flint glasses. 28

Resins. "Ion Exchange Resins" de­scribes desalting method. 9

Rotators. Multi-purpose model has interchangeable heads. 75

Rotators. Submersion unit fits stand­ard water baths. 76

Scanners. Unit is a chromatogram system with thin-layer attachment. 83

Service. Chromatography repairs done in 48 hours. 122

Service. Precious metal content of scrap reclaimed. 30

Service. Info on research laboratory. 35

Solvents. 18 solvents transparent to ultra-violet or near-infrared. 42

Spectra. Brochure includes sample spectra. ' 57

Spectrometers. New models include NMR stabilization. 171

Spectrometers. Counts 100 liquid scintillation samples at room temp.

146

Spectrometers. System performs elec­tronic computation. 22

Spectrophotofluorometers. For reso­lution in fluorescence spectra. 89

Spectrophotometers. Automated ref­erence setting, digital readout. 186

Spectrophotometers. Has accessories to perform added functions. 167

Spectrophotometers. I l l model offers photometric accuracy to 0.1%. 92

Info on three 97

Spectrophotometers. new infrared models.

Spectrophotometers. Uses sucrose gradient technique to scan for proteins.

120

Spectroscopes. Analyzes metallic ions to parts per billion. 128

Spectroscopes. Catalog on line of sampling accessories. 26

Standards. Technical bulletins on spectrographic line. 56

Standards. Cobaltous ammonium sul­fate for spectrophotometer calibration.

134

Supports. Catalog on full line for chromatography. 23

Syringes. Needle is concentrically epoxy-cemented in the syringe bore.

46

{Continued on page 118)

116A . Circle No. 138 on Readers' Service Cant

ANALYTICAL CHEMISTRY

NEW SPEED AND SIMPLICITY IN SURFACE AREA MEASUREMENT

PERKIN ELMER