BUCK Scientific, Inc. - Analytical Chemistry (ACS Publications)

May 31, 2012 - BUCK Scientific, Inc. Anal. Chem. , 1976, 48 (11), pp 848A–848A. DOI: 10.1021/ac50005a747. Publication Date: September 1976. ACS Lega...
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New Products Programmable Coulometer Model 3040 programmable potential coulometer can be used with a variety of external cells for electrochemical analysis, monitoring of any portion of an electrochemical reaction, measure­ ments of elemental concentrations or chemical changes in solution, or, with modifications, other applications nor­ mally performed by polarography or an­ odic stripping voltammetry. The instru­ ment has eight channels of input, each of which can be programmed for time and potential, positive or negative inte­ gration, differentiation, and power for stirring the cell. The potential can be programmed within zones. It is c o m ­ pletely solid state with an electronically established reference value, nanogram sensitivity, and a system accuracy of ± 5 % . Environmental Sciences Asso­ ciates, Inc. 408

Chemicals

BUCK Scientific, Inc. Princes Pine Road, West Norwalk, Conn. 06850

Polyamine-Chelated Alkali Metal Compounds A variety of hydrocarbon soluble chelat­ ed inorganic and organometallic lithium and sodium compounds are available. Stable chelates are formed after certain lithium and sodium compounds react with polydentate tertiary amines such as Λ/,Λ/,Λ/',Λ/'-tetramethylethylenediamine and A/.A/.A/.A/./V'-pentamethyldiethylenetriamine. Alfa Division, Ventron Corp. 421

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1976

Two new Standard Reference Materials are available. SRM 1 8 2 1 , ethanol, is more than 9 9 . 9 % pure and is analyzed for water and certain organic c o m ­ pounds. SRM 1821 is furnished in units of 12 sealed ampuls, each containing 10 ml of ethanol ($57/unit). S"RM 1823, refractive index silicone liquids, con­ sists of two silicone liquids that are thermally and chemically stable over a wide temperature range. The liquids span the refractive index range of a va­ riety of glasses and fibers that are ex­ amined by means of immersion tech­ niques. They are certified for refractive indexes at 10 wavelengths that span the visible spectrum and at four t e m ­ peratures from 20 to 80 ° C . SRM 1823 is issued as a unit consisting of t w o glass vials, with screw caps, each con­ taining 60 ml of liquid ($55/unit). For in­ formation and orders, write to the Of­ fice of Standard Reference Materials, Room B 3 1 1 , Chemistry Building, Na­ tional Bureau of Standards, Washington, D.C.20234