Benzoyl-m-nitroacetanilide as a Gravimetric Reagent for Beryllium

Small quantities of beryllium (2.0 to 3.0 mg) have been determined gravimetrically with benzoyl­-m-nitroacetanilide. The yellow complex is precipitated from solutions of pH 6.5 to 9.0 and weighed directly as Be(C15H11O4N2)2 containing 1.58% of the metal after drying at 120° or after ignition to oxide. Using thioglycolic acid, magnesium-EDTA and/or H2O2 as masking agents separation from Co2+, Cu2+, Mn2+, Pb2+, Ni2+, Zn2+, Al3+, Cr3+, Fe3+, Ce4+, Th4+, TiO2+, VO2+ and UO22+, have been effected. The relative standard deviation is only 0.27%. The method is also applicable to the determination of beryl­lium content of beryl