AbstractThe environmentally persistent pesticidesp,p′‐DDT and dieldrin may be determined simultaneously using an indirect adsorptive stripping voltammetric procedure that takes advantage of the very different binding capabilities of the two materials toward added iron(II). The method has been applied to the determination of these organochlorines in Australian bovine fat samples by employing benzyltrimethylammonium methoxide as a digestion medium. The limits of detection are 0.4 ppb (forp,p′‐DDT) and 0.7 ppb (for dieldrin), and the relative standard deviations (for 10 determinations) are 7.4 and 10.1%, respe