14 A A N A L Y T I C A L C H E M I S T R Y

Α. Η. Τ. CO. S P E C I F I C A T I O N

KARL FISCHER T I T R A T I O N

O U T F I T For determination of water content

ELECTROMETRIC TITRATION OUTFIT FOR DETERMINATION OF WATER CONTENT, Karl Fischer Method, A.H.T. Co. Specification. For the quant i ta t ive determination of small amounts of water by t i tration with iodine-sulfur dioxide reagent. Par­ticularly suitable for the determination of moisture in a great variety of solid, liquid and gaseous samples because it is more rapid, dependable, specific and uni­versally applicable than the common methods of oven drying, distillation or absorption. Fur ther adaptat ion of the method permits analytical control of reactions which quanti tat ively absorb or liberate water. Adopted by A.S.T.M. for moisture test according to s tandard method D-890-51. Also suitable for determination of water in paints and varnishes (titration method) as described in Federal Specification TT-P-141b, method 408.2.

Tests are made in inexpensive commercial jars with G.C.M.I. No. 63 standard screw thread, 140 and 250 ml capacity, respec­tively, which can be used interchangeably in the threaded cap of the Titration Cell. Samples of SO ml are generally used and several can be prepared in advance as the screw capped jars prevent moisture change.

Detection of the endpoint by means of platinum electrodes and electron ray "magic eye" tube offers dependable and uniform results, and is particularly useful in analyses producing highly obscured endpoints. Magnetic stirring affords advantages of simplicity and external application of power to produce stirring action.

Consisting of paired reservoir burettes, 25 ml capacity in Via ml, with automatic zero adjustment, long angled tips, and 1000 ml reservoirs; a simplified titration cell with G.C.M.I. standard thread No. 63; a Serfass Electron Ray Control Unit with electron ray tube in separate cylindrical housing, and a Magnetic Stirring Apparatus with external rheostat and stirring magnets, mounted on a corrosion-resistant support with Coors U.S.A. porcelain base and Spring-Grip clamps.

See John Mitchell and Donald M. Smith, "Aquametry—Appli­cation of the Karl Fischer Reagent to Quantitative Analyses In­volving Water" (New York, 1948).

4935-P.

4WS-P. Electrometric Titration Outfit for Determination of Water Con­tent, Karl Fischer Method, A.H.T. Co. Specification, complete as above illustrated, with paired reservoir burettes, titration cells 140 ml and 250 ml, Serfass Titration Control Unit, Magnetic Stirring Apparatus with three stirring bars, support with 36-inch rod, clamps for assembly, and directions for use, but without reagents. For use on 115 volts, 50 or 60 cycles, a.c 274.82

6276. Titration Vessel (Telly Jar), 140 ml capacity, with metal cap 14

4935-S. Ditto, 250 ml capacity, with plastic cap 28

NOTE—Beckman Model H-2 pH Meter with polarizing adapter (price 2.35) is an excellent substitute for Serfass Control Unit in above outfit. Price of Outfit without Serfass Control Unit 174.92 Price of Outfit complete with Model H-2 pH Meter and polarizing adapter in place of Serfass Control Unit 402.27

KARL FISCHER REAGENTS Fischer, Karl, Reagent, Harleco, for determination of water content by titration, both visual and electrometric methods. This reagent is light in color and provides a very sharp, satisfactory visual endpoint. It is supplied in sets of two component solutions for fresh mixture as required: Solution No. 1, Sulfur Dioxide in Pyridine; furnished in sealed glass ampoule.

Price Solution No. 2, Iodine in Methanol ; furnished in screw cap bottle sufficient in size to act as a mixing container for the set.

16 fluid ounces when mixed, per set 7.25 32 fluid ounces when mixed, per set 12.25

Fischer, Karl, Water Standard, Harleco (Water in Methanol). This solution for restandardizing is adjusted to a value close to the ideal, i.e., 1 ml = 1 mg H2O, and is tested and labeled to indicate H2O equivalent to nearest 0.01 mg.

16 oz. bottle 1.75 32 oz. bottle 3.00 1 gal. bottle 7.50

SYMBOL OF QUALITY

A.H.T.CO. S P E C I F I C A T I O N

LABORATORY APPARATUS

ARTHUR H. THOMAS COMPANY

WEST WASHINGTON SQUARE PHILADELPHIA 5, PA. Teletype Services: Western Union WUX & Bell System PH-72

Laboratory Apparatus and Reagents