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.