PIERCE CHEMICAL COMPANY

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NEW CHEMICALS CONOASH-M is a magnesium sulfonate ash aid available at 1 wt % magnesium in oil. This is equivalent to about 5 % MgS04 when ashed. The preparation is specifically designed to aid in X-ray fluorescence analysis and can be used in other laboratory applications. Con­ tinental Oil Co. 713-225-1511 501

BUCHLER INSTRUMENTS FOR

MONITORING AND COLLECTING LIQUID EFFLUENT These components comprise a highly efficient, automatic system for continuous flow, liquid monitoring and collecting. They can, of course, be used separately and in conjunction with oth­ er instruments; together they form a Chromato­ graphic system that you can depend on. (A) Fractomette: compact, 200 tube linear fraction collector (B & C) Fractoscan: double-beam UV pho­ tometer that permits use of any wave length in the UV range; output linear in optical density. CD) Potentiometric-Servo Recorder: A re­ liable recorder with 5"wide strip chart.

SpecTru AB2 is a new dye for the de­ termination of human serum albumin which has several advantages over HABA. Its working solution is stable for at least 1 year at room temperature. The peak absorbance is about 2.2 times that of the HABA complex. SpecTru AB2 is available in dry form, stock solu­ tion, or working solution. Pierce Chem­ ical Co. 815-968-0747 502 X-ray mix, an additive for X-ray spec­ troscopic sample preparations, comes in 0.5 and 0.25 gram preweighed tab­ lets and 4 4 - μ powder. Samples are polymerized and bonded together under briquetting pressure to give plasticized pellets. The pellets are resistant to breakage, flaking apart in vacuum, and X-ray deterioration. The sample preparation process gives sample particle size reduction, uni­ formity of particle distribution, and homogeneity. The mix is organic in composition and will not chemically react with samples. The powder is $ 1 2 / l b ; tablets are $ 2 3 / 5 0 0 (0.25 gram) and $ 2 5 / 5 0 0 (0.5 gram). Chemplex Industries, Inc. 9 1 4 - 4 7 2 6766 503 Standard Reference Materials to be used as pH buffers in clinical labora­ tories are SRM 9 2 2 , tris(hydroxymethyl)aminomethane, and SRM 9 2 3 , tris(hydroxymethyl)aminomethane hy­ drochloride. These new materials are intended for the preparation of stan­ dard buffer solutions in cases where phosphate buffers would cause unde­ sirable side reactions or do not ade­ quately approximate the required vari­ ations of pH with temperature. SRM 9 2 2 is priced at $ 4 0 for 25 grams; 923 is $ 4 0 for 3 5 grams. They are provisionally certified to yield an ac­ curate, reproducible pH(s) buffer so­ lution ( 0 . 0 1 6 6 7 m , 9 2 2 ; and 0 . 0 5 m , 923); the variation with temperature from 0 ° to 5 0 ° C is also certified. These SRM's may be purchased from the Office of Standard Reference Ma­ terials, Room B314, Chemistry Bldg., National Bureau of Standards, Wash­ ington, D.C. 2 0 2 3 4

BUCHLER INSTRUMENTS

BUCHLER INSTRUMENTS DIVISION NUCLEAR-CHICAGO CORP. A SUBSIDIARY OF G. D. S E A R L E

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CO.

1327 SIXTEENTH STREET. FORT LEE, NEW JERSEY, 07024

CIRCLE 17 ON READER SERVICE CARD

RAPID ONE-STEP PREPARATION OF TMS DERIVATIVES

TRI-SIL/BSA is a potent formulation for the rapid, one-step preparation of t r i m e t h y l silyl ( " T M S " ) derivatives of polar organic compounds, such as alcohols, phenols, other hydroxy or p o l y h y d r o x y compounds, acids, amides and amines, for gas phase analysis and synthetic procedures. Prepared f r o m the powerful silyl donor, BSA (Ν,Ο-bis-TMSacetamide) and freshly distilled dry pyri­ dine (Formula P) or dimethylformamide (Formula D). Packaged in convenient 25 ml Hypo-vials or 1 ml glass ampules. 49011

T R I - S I L / B S A , Formula Ρ $14/25 ml Hypo-vial 10x1 ml ampules, $12.50/pkg

49010

T R I - S I L / B S A . Formula D $ 1 4 / 2 5 ml Hypo.vial 10x1 ml ampules, $12.50/pkg

Our silylation reagents are known the w o r l d over for their p u r i t y , efficiency and conven­ ience. The ready f o r use T R I - S I L formula­ tions rapidly produce volatile and thermally stable derivatives for gas phase analyses in simple one step procedures. Our free 60 page booklet Handbook of Silylation des­ cribes these and other reagents, solvents and standards, lists methods and references and provides numerous suggestions and practical ideas. If y o u d o n ' t have a copy we'll be glad to send you one.

PIERCE CHEMICAL COMPANY P.O. Box 117 Rockford, Illinois 61105 U.S.A. PHONE 815/963-07*7 TWX 910-631-3419

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ANALYTICAL CHEMISTRY, VOL. 43, NO. 14, DECEMBER 1971

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