GAS-CHROM S, Α, Ρ, Ζ

Four Supports That Make the Difference!

GAS-CHROM Ρ, 1 0 0 / 1 2 0 mesh with 10 wt. % EGSS-X. Column: 6 ft. χ 4 mm glass U-tube. Temperature: 180°C. Compounds separated (percentage in mix­ture given in parens.): 1 . Methyl Myristate ( 1 % ) ; 2. Methyl Palmitate ( 4 % ) ; 3. Methyl Stéarate ( 3 % ) ; 4. Methyl Oleate ( 4 5 % , peak attenuated to prevent going off scale); 5. Methyl Linoleate ( 1 5 % ) ; 6. Methyl Arachidate ( 3 % ) ; 7. Methyl Linolenate ( 3 % ) ; 8. Methyl Behenate ( 3 % ) ; 9. Methyl Erucate ( 2 0 % ) ; 10. Methyl Lignocerate ( 3 % ) . This mixture (F & OR Mixture No. 3) and EGSS-X are available from Applied Science.

Never underestimate the power of your support. It can make the difference between a good and poor gas chromato­graphic separation. For several years our GAS-CHROM S, A, Ρ, Ζ supports have consistently given better results. Al l four are made f rom the same top-grade diatomite; they di f fer only in their treatment. GAS-CHROM S is non-acid washed, GAS-CHROM A is acid washed, GAS-CHROM Ρ is acid and base washed, and GAS-CHROM Ζ is acid washed and treated w i th dimethyldichlorosilane.

Note the chromatogram above,· methyl esters of 10 fatty acids, ranging f rom C14 to C24, have been separated on a single column. It's just one example of the analyses you can achieve w i th GAS-CHROM S, Α, Ρ, Ζ. Prices and mesh sizes are given in our 1969 Catalog No. 12. For more details ask for Bulletin No. 18.

Applied Science Laboratories Inc. Ρ. Ο. Βox 440 · State College, Pa. 16801 * Tel.: 814-238-2406

West Coast Office: 1135 Inglewood Avenue · Inglewood, Calif. · Tel.: 213-678-9022

New Products

The EM8 ultra-high resolution electron microscope derives its high resolution characteristic from an objective lens by combining a very short focal length with coefficients of spherical and chro­matic aberration significantly less than 1 mm. These features coupled with a fully corrected lens system and very stable power supplies, assure reliable attainment of 3Λ point-to-point resolu­tion or better. The standard specimen chamber in the EM8 accepts up to six specimens at one loading and the vacuum is maintained during examina­tion of all six samples. Specimen han­dling facilities include a full resolution tilting stage and a serial section stage. Picker Nuclear, 1275 Mamaroneck Ave., White Plains, Ν. Υ. 10605 407

Laboratory Press

A 25-ton hydraulic ring press for preparing samples for spectrophoto-metrie analysis is available. Model 00-25 press will accommodate most KBr, X-ray, and other dies in the prep­aration of laboratory specimens. Quick and continuous adjustment between compression surfaces and accessibility from all sides are among the features. Damage to specimens is prevented by means of a pressure relief valve which allows maximum pressure to be regu­lated at any given point from 0 to 25 tons. Beckman Instruments, Inc., 2500 Harbor Blvd., Fullerton, Calif. 92634

408

Analytical Balance

Type SNC 1000 has a capacity of 1,000 grams with a sensitivity of 0.1 mg. Reproducibility of this kilogram balance is ±0.08 mg. Wm. Ainsworth, Inc., 2151 Lawrence St., Denver, Colo. 80205 409

Circle No. 10 on Readers' Service Card

WRITE FOR OUR 1969 CATALOG #12

120 A · ANALYTICAL CHEMISTRY