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In particular, if the potentiometric measurement of a solution with a low substrate concentration is made after the potentiometric measurement of a solution with a high substrate concentration, the response time is even longer. To improve the response time of a C02 electrode, a new membrane is urgently needed. ACKNOWLEDGMENTThe authors wish to thank Millard Burroughs for technical help throughout the experiments.

Phosgene is a colorless, low boiling liquid which is manufactured by the reaction of carbon monoxide and chlorine over activated carbon. It is a very toxic substance and extensive safety procedures and equipment have been developed to help ensure safety of handling. Because of its low boiling point and high toxicity, measures must be taken to prevent the entrance of phosgene into sewers and drains. Phosgene is a widely used intermediates. Practically all phosgene is captive, ie, used in the manufacture of other chemicals within the plant boundary. The major portion of phosgene produced goes into the production of isocyanates. It is also used in the production of polycarbonates and fine chemicals. The possiblity of phosgene–free technology may impact the market for phosgene.

Phosgene is a colorless, low boiling liquid which is manufactured by reaction of carbon monoxide and chlorine over activated carbon. It is a very toxic substance, and extensive safety procedures and equipment have been developed to help ensure the safe handling of phosgene. Phosgene is an important and widely used intermediate for chemical synthesis. Its primary use is for the manufacture of polyisocyanates for the polyurethane industry. Other uses are the production of polycarbonate, chloroformates, agrochemicals, and intermediates for pharmaceuticals and dyestuffs. Vol. 18, pp. 645–655, 91 refs. to August 1995.