Sample preparation for XRF-AA-ICP-CHEM.

AcoustoSizer determines particle size and zeta potential in concentrated colloidal suspensions over a size range of 0.1-10 μιη at sample concentrations up to 40 vol %. Matec Applied Sciences 418

guidelines for security and audit trail requirements. Final reports can be printed or transmitted electronically by fax, modem, or electronic mail. ChemWare 413

Manufacturers' Literature N e w s l e t t e r . The Restek Advantage highlights columns and accessories for capillary chromatography. Infor­mation on troubleshooting and refer­ence books is also provided. 12 pp. Restek Corp. 414

SFE. Brochure describes the Prep-Master SFE system for preparation of environmental, petroleum, poly­mer addi t ive , and food samples . Pressure and temperature program­ming, flow control, and on- or off­line collection are discussed. Suprex

415

LC. Poster illustrates a protein mol­ecule along with the structures and molecular weights of the 20 amino ac i d s . G u i d e l i n e s for s e l e c t i n g Brownlee HPLC columns are listed. Applied Biosystems 416

GC/MS. Application note describes the detection and quant i ta t ion of phencyclidine extracted from spiked u r i n e samples . Pha rmaco log ica l properties, experimental procedure, and instrument conditions are dis­cussed. 6 pp. Hewlett-Packard 417

Immunoassay. Optimization of Nitro­cellulose Membrane-Based Immunoas­says discusses the properties of nitro­

cellulose membranes and their use in solid-phase immunoassays. 30 pp. Schleicher & Schuell 419

Catalogs GC. Catalog features GC supplies, accessories, and instrumentation. In­cluded are autosamplers, columns, injectors, sampling devices, detec­tors, and reference and training ma­terials. 212 pp. Perkin Elmer 420

HPLC. Catalog includes solvent de­livery systems, detectors, columns, fittings, tubing, packing materials, standards, buffers, reagents, valves, filters, and frits. 160 pp. Bodman

421

Life sc iences . Catalog features in­struments, columns, and reagents for nucleic acid and peptide synthesis, protein sequencing, chromatography, and capillary electrophoresis. 80 pp. Waters Chromatography Division of Millipore 422

Laboratory e q u i p m e n t . Catalog includes incubators, vacuum pumps, filters, pipets, microscopes, stirrers, electrodes, pH meters, blenders, and analytical and top-loading balances. 32 pp. Whatman LabSales 423

Industr ia l h y g i e n e . Catalog de­scribes sorbent tubes for air sam­pling, passive dosimeters, cassette filters, sampling pumps, gas sam­pling bags, impingers, flow calibra­tors, and accessories. 24 pp. Alltech

424

with

Claisse Fluxes

(Borates and Phosphates)

V J et a new perspective on analysis and better results. The CLAISSE FLUXES have exceptional qualities due to their

PURITY and COARSE texture. Claisse Fluxes are Tip-Top.

FEATURES • free-flowing crystals

• low surface area • high density

• fused, not mixed • popular and special compositions

CONSEQUENT ADVANTAGES • no loss from static electricity

• no loss by splattering or foaming on heating

• very low water absorption no uncertainty on quantity weighed

• no segregation in containers • FREE SAMPLE upon request

For world-wide sales, address of local agents and service information please call or write to:

2522, chemin Sainte-Foy Sainte-Foy (Québec) Canada G1V 1T5 Tel: (418) 656-6453 Fax: (418) 656-1169 Telex: 051-31731

CIRCLE 24 ON READER SERVICE CARD ANALYTICAL CHEMISTRY, VOL. 64, NO. 4, FEBRUARY 15, 1992 · 281 A

m\ mm

corporation scientifique claisse inc.

The First and Finest in Fusion.