COLLEGE STATION, TX–Mar 25, 2008 — O.I. Corporation (NasdaqGM:OICO – News) today announced that its Board of Directors will nominate John K.H. Linnartz to stand for election at its 2008 Annual Meeting of Shareholders. Mr. Linnartz is the Managing Member of Mustang Capital Management, LLC, one of the Company’s three largest shareholders. “We previously announced our intent to reduce our Board by two members at the 2008 Annual Meeting,” stated Ray Cabillot, Chairman of the Board. “Subsequent to this announcement, we received letters from several of our larger shareholders requesting greater shareholder representation on the Board. In response to this input from our shareholders, we plan to nominate Mr. Linnartz to serve on the OI Board. The addition of Mr. Linnartz as a director should increase Board shareholder representation to approximately twenty percent of the Company’s outstanding shares of common stock, while reducing the overall size of the Board by one member.” The Company’s 2008 Annual Meeting of Shareholders will be held on Monday, May 19, 2008, at 11:00 a.m. at the Company’s headquarters. Shareholders of record as of April 1, 2008, will be eligible to vote upon the matters proposed for consideration at the meeting. About O.I. Corporation: O.I. Corporation, dba OI Analytical, develops, manufactures, sells, and services analytical instrumentation that detects, measures, analyzes, and monitors chemicals in liquids, solids, and gases. Providing products used to digest, extract, and separate components of chemical mixtures, the Company designs application-specific solutions for various industries including environmental testing, defense, and petrochemical. Headquartered in College Station, Texas, the Company’s products are sold worldwide. Visit the Company’s worldwide web site at: http://www.oico.com