The Solvent Extraction-Spectrophotometric Determination of Perchlorate Ions with Monoethynolog of Malachite Green

By the use of a new reagent, 1,1-bis(p-dimethylaminophenyl)-3-phenyl-2-propynylium chloride, i.e., one of the ethynologs of Malachite Green, micro amounts of perchlorate ions could be extracted into chlorobenzene and determined spectrophotometrically. Beer’s law holds over the range of 4×10−6–2.5×10−5 M (M=1 mol dm−3); e=4.0×104 dm3 mol−1 cm−1 at 690 nm.