Measurement of Phosphorus in Metals by RNAA |
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Authors: | R L Paul |
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Institution: | (1) Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA |
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Abstract: | An RNAA procedure has been developed for measurement of low-level phosphorus in metals. Samples are irradiated at a neutron flux of 2.7·1013 n·cm–2·s–1 then mixed with carrier and dissolved in acid. After chemical separation and purification of the phosphorus and gravimetric determination of carrier yield, 32P is determined using a beta proportional counter. The detection limit for a 0.1 g sample irradiated for 30 minutes is 5 g/kg. The method has been used to determine 6.4±0.6 mg/kg phosphorus in SRM 2175 refractory alloy. |
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