Exhibit 32.2 CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Craig A. McCollam, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report of Dionex Corporation on Form 10-K for the year ended June 30, 2003 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Annual Report fairly presents in all material respects the financial condition and results of operations of Dionex Corporation. By: /s/ Craig A. McCollam -------------------------------- Name: Craig A. McCollam Title: Vice President and Chief Financial Officer Date: September 19, 2003