A group of local black business executives from the Black Presidents Roundtable Association will go to the Caribbean nations of Trinidad and Tobago next week to investigate business opportunities for black-owned firms.

The 12 presidents and chief executive officers will make the business mission in partnership with the Caribbeana Council, a private organization under contract with the U.S. Department of Commerce to help small and minority firms work with busineses in the Caribbean region, and the help of the embassies of Trinidad and Tobago. The effort is part of the Reagan administration's Caribbean Basin Intiative, which seeks to expand U.S. business involvement in the region.

"Minority businesses can play a substantial role in the development of Third World countries," said BPRA president, Roy Littlejohn of Littlejohn Associates Inc., a local consulting firm, who will take part in the trade mission. "This is the first time in a long time that the U.S. is paying attention to this part of world," Littlejohn continued, "We want to contribute to the development and involve ourselves in trade and commerce worldwide."

The Washington-based BPRA, which was founded five years ago, works to enhance the growth of minority-owned business through trade and business missions, seminars and lobbying activities. Littlejohn also said that the association plans to sponsor trade missions to Africa and the Middle East this year.

The Caribbeana Council was established in 1977 to promote political and business relations between the Caribbean Basin and the United States. Over the last three years the council has sponsored 450 small and minority business executives on trade and investment missions to the Caribbean region. The missions have generated more than $22.8 million in completed transactions, said Walker Williams, executive director of the council.

Walker said the council sponsors missions to Carribean nations because the business climate is good, and successful investments there will help small businesses in the United States grow, thus generating employment here. TRADE

The international division of the U.S. Chamber of Commerce has announced three staff appointments. Mark Van Fleet, former international division director of trade development and public relations, has been named director of Asia-Pacific affairs. Caroline J. Beeson, a former independent consultant on international trade and development, has been named director of South Asian Affairs;and Debra Jackson Busker has been named director of trade development and public relations. Busker formerly was international program manager for the Chamber's Northeast Region.

Odonna Mathews, vice president of consumer affairs for Giant Food Inc., has been elected president of the Washington chapter of the Society of Consumer Affairs Professionals in Business.

The D.C. chapter of SOCAP was established in 1976 and currently has 250 members who represent consumer interests for business and government organizations. The national SOCAP has approximately 1,500 members.

Other SOCAP officers elected were: vice president, Eleanor Kelley, U.S. Treasury; secretary, Irene Vawter, Federal Trade Commission; treasurer, Paul Pumpian, U.S. Small Business Administration, and board members, Barbara Ettinger, Safeway, and Fred Cooke, Bell Atlantic.

The American Cattlemen's Association has completed expansion of its Washington office.

The association has doubled its Washington governmental affairs and policy development staff and moved to more spacious offices on Pennsylvania Avenue near the Capitol. "The changes are all designed to help NCA win more battles for cattlemen in Washington," said NCA executive vice president John Meetz.

The expanded NCA staff now numbers 13. The most recent staff appointments are: Chuck Ball, manager of Washington information; Chandler Keys; Alan Sobba, and Mary Ellen Suda, policy analysts.

The Foundation for Public Affairs has selected Douglas J. Bergner as its executive director.

As the public policy and education arm of the Public Affairs Council, the foundation is supported through dues by numerous companies and associations.

Bergner has been a Public Affairs Council staff officer for the past four years, his responsiblities have included counseling member companies on public policy problems, and planning conferences and curricula, as the manager of international issues management programs and then for the last two years as the director of program development for the council.

The Council of Better Business Bureaus, the organization representing the nation's 186 Better Business bureaus, has announced two vice presidential appointments. The Arlington-based council named Walter Stein vice president and controller and Candace Von Salzen vice president of the standards and practices division.

Robert G. McCune has been appointed vice president for division operations at the National Electrical Manufacturers Association. He replaces Joseph G. Werner, who is retiring after 25 years with NEMA.

The Tuna Research Foundation Inc. has elected James T. McCarthy, vice president of resources and development for Bumble Bee Seafoods, as its chairman and president for 1985. The foundation is a Washington-based trade association serving the interests of the tuna processing industry.

The Edison Electric Institute has hired Howard Tobias, a former vice president of N. W. Ayer Inc., a New York advertising agency, as its director of communication services.

The Greater Vienna Chamber of Commerce has elected Thomas K. Herron as its president. Herron is the president of Herron & Associates, an advertising firm based in Vienna, Va. The chamber was founded in 1963 to represent businesses in Vienna, Oakton and parts of Tysons Corner. PROFESSIONAL

The American Water Works Association has elected Floyd F. Eunpu of Fairfax as its treasurer. The AWWA is a professional organization with 36,000 members nationwide who work as municipal and private water suppliers and manufacturers. Eunpu is the director of the Fairfax County Water Authority's engineering and construction division.

The American Association of School Administrators' executive committee has chosen William B. Royser as the executive director of the 18,000-member group, effective April 1. Miller was president of the Arlington-based association for the 1980-81 term and previously served on the association's executive committee. AASA members include educational leaders from all over the world, including school superintendents, principals, college and university deans and other administrators within the educational system.