CHEMICALS
NEW
CHEMICALS
REAGENTS MATERIALS
Thirteen Additions to Organic Chemicals Line Distillation Products Industries, a division of Eastman Kodak Co., an nounces 13 chemicals newly available from the company. Among these organic chemicals is 2-pdimethylaminostyryl - 1,3,3 - trimethyl3i7-pseudoindolium iodide, a reagent for the determination of sulfur dioxide or smog in air. Another addition to the list is 3,3'-dimethylnaphthidine. The company says this reagent is useful in the determina tion of chlorine in water, as an oxida tion-reduction indicator, as an indicator for the determination of gallium, and also as an indicator for titration of zinc, cadmium, calcium, and indium. 4,5 - Dihydroxy - 3 - (p - sulfophenylazo)-2,7-naphthalenedisulfonic acid trisodium salt is a third new Eastman organic chemical. According to the company, recent literature reports this compound may be used as an indicator
in complexometric titration of zir conium, for the titration of thorium, and for the titrimetric determination of microgram amounts of fluoride ion. The fourth added chemical is ΛΓphenylbenzohydroxamic acid, which is reported useful in the gravimetric de termination of copper, iron, aluminum, and titanium; the colorimetric deter mination of vanadium; and as a reagent for tin. The remaining additions to Eastman's list of organic chemicals include the following : 2-Amino-2-(hydroxymethyl)-l,3-propanediol ieri-Butyl ethyl ether ierf-Butyl methyl ether o-Dibromobenzene 5,7-Diiodo-8-quinolinol Diphenyl phthalate 9-Methylanthracene 1-Methylquinolinium chloride S-Nitro-2-benzimidazolethiol 18 Laboratory Quantities of Four Complexing Agents A v a i l a b l e
Fisher Scientific Co. is now offering the following compounds in laboratory amounts :
T H E MOSELEY
AUTOGRAF X-Y R E C O R D E R
Model 2 A flat-bed
Model 3 desk type
Write for complete information:
F. L. M O S E L E Y C O . 409 NO. FAIR OAKS AVENUE PASADENA, CALIFORNIA
Model 4 rack type
19
trademark
A pioneer in its field, the Moseley AUTOGRAF X-Y Recorder is being adapted to an ever increasing number of graphic recording and data translating problems. Carefully manufactured to precision standards, the AUTOGRAF is available in five models to fit your particular requirement. In addition to curve drawing, a full complement of accessories facilitate use of the AUTOGRAF in point plotting, curve following, card and tape reading, and gain-frequency plotting.
Model 1 portable type
(Tetra) sodium ethylenediamine tetraacetate, known for forming stable, soluble compounds with most metallic ions, is available as a liquid in a tech nical grade. This compound is con sidered a versatile complexing agent, one gram of the solution chelating a minimum of 67 mg. of calcium carbonate at pH 11, says the company. (Tetra) potassium ethylenediamine tetraacetate is offered for the first time anywhere in laboratory quantities, claims Fisher. Recommended particu larly for reactions where the sodium ion is undesirable, as in determination of barium or strontium, it can also be used in complexing reactions where the sodium salt would be used. This com pound is available in a purified grade. Ethylenediamine tetraacetic acid, of fered in dry powder form in a reagent grade, is said to be especially effective for the inactivation of polyvalent metal ions. Fisher says it is also used as a raw material for the preparation of vari ous derivatives, including metal chelates, salts, and esters. Calcium disodium ethylenediamine tetraacetate, widely used as a stabilizer in the drug and pharmaceutical indus tries, is available as a solution in ap proximately 25% concentration. This compound is offered in a purified grade.
Model 5 rack type
List of Radioactive Compounds Expanded
Three additions to its list of over 160 radioactive carbon-14 compounds are announced by the Nuclear-Chicago Corp. These are: gramine-C-14, DLtryptophan-3-C-14, and D-mannose. Gramine-C-14 is said to be of value in chemical, biological, and pharmacologi cal research. This radioactive alkaloid is useful in the preparation of tagged tryptophan and in the study of trypto phan chemistry and physiology. DL-tryptophan-3-C-14 is a radio active amino acid which will be useful in the study of amino acid formation and metabolism and in the study of biologi cal systems, says the company. Uniformly labelled D-mannose, the newest addition to Nuclear-Chicago's list of labelled sugars, is available at the activity of 20 millicuries per millimole. The company feels it will be useful in metabolism, photosynthesis, and physi ological studies of sugar systems. 20 •
For further information, circle number 88 A on Readers' Service Card, page 77 A 88 A
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ANALYTICAL CHEMISTRY
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