DETERMINATION OF TRACE AMOUNTS OF CHLORINE IN SILICA BY PRESSURIZED ALKALINE DECOMPOSITION ION CHROMATOGRAPHY/

Trace amounts of chlorine in silica were determined by pressurized alk aline decomposition/ion chromatography. Each sample was decomposed wit h tetramethyl ammonium hydroxide in a teflon pressure vessel at 140 de grees C for 6 hours. In order to separate the matrix components, the d ecomposition solution was passed through a cation exchange column (mur omac 500WX8, 50 similar to 100 mesh; 12 ml). The column was then washe d with pure water. Chlorine of the eluate was determined by ion chroma tography. Quantitative recoveries were obtained for chlorine. The dete ction limit of chlorine was 0.6 mu g/g. Trace chlorine in silicas for electronics was determined.