Exhibit 99.1

                            CERTIFICATION PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
                            (18 U.S.C. SECTION 1350)*

        In connection with the Annual Report of Martin Midstream Partners L.P.,
a Delaware limited partnership (the "Partnership"), on Form 10-Q for the quarter
ending March 31, 2003 as filed with the Securities and Exchange Commission (the
"Report"), I, Ruben S. Martin, President and Chief Executive Officer of Martin
Midstream GP LLC, the general partner of the Partnership, certify, pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350), that to
my knowledge:

        (1) the Report fully complies with the requirements of Section 13(a) or
            15(d) of the Securities Exchange Act of 1934; and

        (2) the information contained in the Report fairly presents, in all
            material respects, the financial condition and result of operations
            of the Partnership.

        /s/ RUBEN S. MARTIN
        ----------------------------------------------
        By: Ruben S. Martin, President and Chief Executive Officer
            of Martin Midstream GP LLC,
            the General Partner of Martin Midstream Partners L.P.

        May 12, 2003

*A signed original of this written statement required by Section 906 has been
provided to Martin Midstream Partners L.P. (the "Partnership") and will be
retained by the Partnership and furnished to the Securities and Exchange
Commission or its staff upon request.