Photometric Determination of Tin in Iron and Steel. I : Studies on Color Reaction of Stannous Salt with Cacotheline

To meet a need of simple microdetermination of tin in small amount of iron and steel samples, the photometric method was studied. Fundamental experiments were carried out on the color reaction of stannous salt with cacotheline to obtain the suitable conditions for the determination of tin separated from actual metal samples. After the stannous solution was reduced by aluminium in the stream of carbon dioxide, cacotheline was added to it. The photmetric measurement was made using Pulflich\u27s photometer, and the definite conditions for the determination of tin were determined. Effects of other ions were also examined and aluminium, arsenic, beryllium, cadmium, cobalt, magnesium, manganese and nickel had no effect on this reaction, but iron, antimony, chromium, silver, mercury, tungsten, molybdenum, vanadium and titanium had some