Reagent Characteristics GFS Organic Halogen Reagent is a viscous, dark blue solution of sodium biphenyl complex in diethylene glycol diethyl ether (ethyl diglyme). The product has a limited shelf life, losing strength during storage at a rate of about 3-10% per month. Packages are marked with a projected expiration date, although the reagent may be used as long as it continues to give a dark blue, black, or green color when added to the sample. Diminished strength can be compensated for by increasing the amount of reagent used. GFS schedules the production of OHR (Organic Halogen Reagent) according to anticipated customer use; we make special effort to provide single-lot shipments of larger orders whenever possible. The reagent should be stored in a cool place but not refrigerated. Cold storage, which may include shipping during winter months, can result in partial crystallization of the reagent that can then adhere to the surface of the plastic bottles in which it is packaged. Usually this condition can be detected by careful observation and solid materials often can be re-dissolved by carefully shaking the bottle that has been warmed to room temperature or slightly above. Instruction on the use and disposal of the reagent accompanies each package shipped. Typical Procedure Measure sample into a clean, dry separatory funnel. Dissolve solid or small samples in a halogen-free, anhydrous inert solvent such as toluene, ethyl diglyme, or THF. Empty one vial of OHR into the funnel, stopper, and mix. Retention of the dark blue, black or green color indicates sufficient active reagent is present. If the color quickly fades, add additional OHR. After two minutes, extract with water or dilute nitric acid. The extracted halides, completely converted to ionic forms, can be determined by conventional analytical methods. Advantages Rapid – analysis can usually be made in 30 minutes or less. Safe/Convenient – Avoids hazard and bother of preparing sodium biphenyl in the laboratory. No need for combustion apparatus or pressure vessels. Versatile – applicable to a wide range of organic materials: pesticides, hydrocarbons, polymers, medicinals, solvents, naphtha and petrol, etc. Works with solids, liquids, and gases. Low Blanks – engineered for the production of low-halogen content OHR. Economical – saves time and eliminates the need for extraneous equipment. Wide-range – accommodates all halides, including fluoride, microgram traces or macro quantities. Packaging and Shipping The proper DOT shipping name: Combustible liquid, n.o.s.; normal shipment is via common carrier ground, air shipments possible upon request. Package units consist of 20 x 15ml plastic vials per box. Teflon liners are not to be used in the storage or packaging of OHR. The entire contents of a vial should be used in any analytical procedure in order to minimize deterioration of the product by exposure to air and moisture.
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