New Chemicals
SAVE up to
55% ELKAY
MANIFOLD PUMP TUBING
such as waxes, steroids, and polynuclear aromatics). All of the new packings are available in particle sizes of 80-100 mesh and are packed in 75-cc units. Price per unit for low retention Durapak is $49, the others sell for $45 per unit. Waters Assoc, Inc., 61 Fountain St., Framingham, Mass. 01701. 215-735-2400 503
Reagents for Hg and Pb Determinations Special grades of nitric, sulfuric, and perchloric acids for the trace determi nation of mercury and lead are avail able. The Hg and Pb specifications for both are less than 10 ppb. The acids are packaged in one-pint and five-pint glass containers. J. T. Baker Chemical Co., 222 Red School Ln., Phillipsburg, N. J. 08865. 201-859-2151 504
Liquid Scintillators
Standard type Auto Analysis MANIFOLD PUMP TUBING. Eighteen months of research and development has led to the finalization of our specially processed standard vinyl tubing to ElKay specifications. This tubing is cut to 15 inch lengths with color coded wishbone bridges affixed to yield a 6 inch center pumping section. Carefully controlled tubing I.D., O.D., and wall Thickness.
IMMEDIATE DELIVERY When ordering, please specify Catalog No., Size and Color Code.
ELKAY PRODUCTS, INC. 5 BARBARA LANE / WORCESTER, MASS. 01604 TEL.
(617) 757-«435
Circle No. 54 on Readers' Service Card
Three low-cost liquid scintillators now available combine excellent per formance with reliability. NE 235 mineral oil-based scintillator (for largevolume application) has a high flash point, excellent light transmission prop erties, and does not attack Perspex, Lucite, or Plexiglas. NE 233 toluenebased and N E 250 dioxan-based liquid scintillators are widely used for internal counting applications. NE 233 is used for samples soluble in organic solvents or with Solubiliser NE 520, Hyamine, Triton-X, etc. It has a light output of 74% relative to anthracene. NE 250 is recommended for routine counting of aqueous samples. It has a high water capacity, five parts by volume will ac cept up to one part water. Light out put is 50% relative to anthracene. NE 235 is supplied in 20-, 100-, and 200liter drums; NE 233 and 250 are sup plied in bottles of 2 liters. Nuclear Enterprises, Ltd., Sighthill, Edinburgh 11, Scotland. 031-443-4060 505
NEWT Model 8430 Gas Chromatograph for only $650 Have Gas Chromatograph, will travel! The new Matheson Model 8430 is the ideal instrument where ease of trans portation and economy are important factors. Small (12" χ 13"χ 16") and sturdy, it can be easily transported in the trunk of a car for on-site analysis. This compact unit can be used with syringes or sampling valves. In short, it can perform practically all the func tions of units costing twice as much. Compatible systems for all gases and handling equipment is what Matheson is all about. To learn all about the new Model 8430 Gas Chromatograph,send coupon for Engineering Report G-124. MATHESON . A D i v a o n of W.ll O o s s
Bio-Aids Purified enzymes and other aids for biological research are now available from a company that has specialized in the production of antisera as well as purified serum proteins. Also offered are fresh-frozen animal tissue and tis sue extracts. Custom antibody syn thesis and cvistom protein fractionation are two other services offered. A cat alog described the products and capa bilities of the company. Dexter Bio logical Co., 2844 Baker Rd., Dexter, Mich. 48130. 313-426-4777 506
GAS
PRODUCTS
Ire
East Rutherford, N.J.; Cucamonga, Calif.; Gloucester, Mass.; Joliet, III.; Laporte, Texas; Morrow, Ga.; Newark, Calif.; Whitby, Ont.
Matheson Gas Products, P. O. Box 8 5 , { Dept. A C - 2 7 1 , East Rutherford, N.J. 0 7 0 7 3 . | S e n d me Engineering Report G-124
j Firm. I Address« City_ I I State-
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Circle No. 130 on Readers' Service Card
ANALYTICAL CHEMISTRY, VOL. 43, NO. 2, FEBRUARY 1971 ·
145 A
