Spectrographic Determination of Microamounts of Cerium, Lanthanum, Neodymium and Praseodymium in Iron and Steel Spectrographic Determination of Microamounts of Cerium, Lanthanum, Neodymium and Praseodymium in Iron and Steel

A spectrographic method was studied to determine microamounts of rare earths in iron and steel with a quartz spectrograph of medium type. Rare earths were separated by precipitating them as fluorides from an acidic sample solution, and the fluorides were converted into chlorides, which were then excited on a copper electrode by an intermittent arc. Barium chloride served as spectroscopic buffer, and strontium chloride was used as internal standard. Cerium, lanthanum, neodymium and praseodymium were determined with the following line pairs : SrII 4215.52A/Ce 4137.65A. SrII 4215.52A/LaII 4196.55A, SrII 4215.52A/Nd 3905.89A and SrII 4215.52A/Pr 4189.52A.

A spectrographic method was studied to determine microamounts of rare earths in iron and steel with a quartz spectrograph of medium type. Rare earths were separated by precipitating them as fluorides from an acidic sample solution, and the fluorides were converted into chlorides, which were then excited on a copper electrode by an intermittent arc. Barium chloride served as spectroscopic buffer, and strontium chloride was used as internal standard. Cerium, lanthanum, neodymium and praseodymium were determined with the following line pairs : SrII 4215.52A/Ce 4137.65A. SrII 4215.52A/LaII 4196.55A, SrII 4215.52A/Nd 3905.89A and SrII 4215.52A/Pr 4189.52A.