A new method for the determination of lead in organic material, with special reference to dyestuffs

Application of Colorimetry to Analysis of Corrosion-Resistant Steels.Determination of Lead

“…The dithizone separation and estimation of lead adopted were essentially the same as those found in many methods for determination of lead in organic and biological materials recorded in the literature during the past 12 years (1,5,8,10). Stannous tin, bismuth, and thallium are the only interfering elements.…”

Determination of minute amounts of lead in biological materials

“…Stephen G. Simpson with Walter C. Schumb, Massachusetts Institute of Technology, Cambridge, Mass. THE selenite method has been shown to be capable of giving accurate results and to be applicable to the determination of zirconium in ores (3) and in alloys (1). It is somewhat longer than the phosphate method, but the freshly precipitated zirconium selenite is soluble in hydrochloric acid and errors of co-precipitation can be readily eliminated by a second precipitation before ignition to the oxide.…”