Procedure for the Precipitation of Iron, Chromium, Molybdenum, and Tungsten in the Determination of Arsenic and Antimony in Alloy Steels

A possibility of the separation of trace amounts of arsenic and antimony and macroquantities iron, chromium, molybdenum, and tungsten by the precipitation of the latter was investigated; regularities of the coprecipitation of arsenic and antimony are studied. The coprecipitation of arsenic and antimony in the precipitation of iron, chromium, molybdenum, and tungsten can be inhibited by introducing a certain amount of hydrofluoric acid. This decreases the specific surface and porosity of the precipitates and inhibits the coprecipitation process. A method is developed for the simultaneous determination of arsenic and antimony in alloy steels by inductively coupled plasma atomic emission spectrometry with preliminary separation of the main components of iron, chromium, molybdenum, and tungsten.