Using NAA to the Determination of Antimony in Trichlorosilane with Substoichiometric Extraction

Abstract

Neutron activation analysis has been applied to the determination of trace of antimony based on the substoichiometric extraction of Sb(III) with BPHA (N‐benzoyl‐N‐phenyl hydroxylamine). The antimony contens in trichlorosilane or high purity silicon can be determined by the proposed method down to ppb range. The effect of acid concentration, shaking time, the amount of carrier and the decontamination factors were studied.

Dissimilatory Antimonate Reduction and Production of Antimony Trioxide Microcrystals by a Novel Microorganism

“…Following acidification, 0.5 mL of a 100 mM solution of N-benzoyl-N-phenylhydroxylamine (BPHA) in chloroform was added to the tube and the mixture was vortexed for 15 min at room temperature. Between pH 0.3 and 6, antimonite forms a nonionic complex with poorly water-soluble BPHA, quantitatively extracting antimonite into the organic phase, whereas no extraction of antimonate occurs within this range. , Following extraction, the concentration of Sb in the aqueous phase (corresponding to antimonate) was measured by the CAIS at UGA using a Thermo Jarrell - Ash 965 inductively coupled argon plasma optical emission spectrometer (Thermo Jarrell-Ash, Franklin, MA) at an emission wavelength of 206.83 nm. The antimonite concentration was then determined by subtracting the antimonate concentration we measured from the total amount of antimonate initially added to the culture medium.…”