Jonas Carol, 72, retired director of the division of pharmaceutical sciences of the Food and Drug Administration, died of cardiac arrest June 9 at Suburban Hospital in Bethesda.

In 1930, after receiving a master's degree in chemistry from Washington University in St. Louis, Mo., he was appointed to the Chicago station of the Food and Drug Administration as a junior chemist. He subsequently spent 15 years as an analytical food and drug chemist for the FDA in Chicago and Cincinnati.

In 1945, he was transferred to Washington to assist in the development of analytical methods for drugs in dosage forms. He specialized in instrumental analysis, chromatographic procedures and methods for steroid hormones and alkaloids.

After retiring in 1969, Mr. Carol worked as a consultant for the United States Pharmacopoeia and later for the Pan American Health Organization. He retired as a consultant in 1975.

He was a member of the American Chemical Society, American Pharmaceutical Society, American Institute of Chemistry and Association of Official Agricultural Chemists. He was also a member of the Potomac Chrysanthemum Society and the Korea Stamp Society.

Survivors include his wife, Florence, of the home in Rockville; two daughters, Jean Carol, of Cincinnati, and Mary Louise Heilman, of Rochester, N.Y.; a son, Robert W., of Calcutta, India, and two grandchildren.