INTRUMENTAL APPROACHES FOR IMPROVING THE DETECTION LIMIT FOR SELECTED PCDD CONGENERS IN SAMPLES FROM THE GENERAL U.S. POPULATION AS BACKGROUND LEVELS CONTINUE TO DECLINE Publication Attachment: 06-588.pdf Authors: Turner, WE, Welch, SM, DiPietro, ES, Whitfield, WE, Cash, TP, McClure, PC, Needham, LL, Patterson, DG Jr. Year: 2006