N. Gerard Muenzen has been appointed vice president of purchasing at Sea-Land Industries Inc. of Menlo Park, N.J., an affiliate of the Sea-Land Service containership operator, according to the company.

The firm's director of purchasing since 1973, Mr. Muenzen will take responsibility for the acquisition of goods and services needed by the Sea-Land group of firms, the transportation group of R.J. Reynolds Inc. of Winston-Salem, N.C.

Before joining Sea-Land, Mr. Muenzen was purchasing manager for the Continental Can Co. of New York City.