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ASTM E147 1961 Edition, September 18, 1961
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Standard Specification for Apparatus for Microdetermination of Nitrogen by Kjeldahl Method
Includes all amendments and changes through Reapproval Notice , 2011
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This specification covers digestion and distillation apparatus used for the microdetermination of nitrogen by the Kjeldahl method, and modifications thereof at atmospheric pressure.

NOTE 1—This specification is based on those originally developed by the Committee on Microchemical Apparatus, Division of Analytical Chemistry, American Chemical Society.2

2 Committee on Microchemical Apparatus, “Recommended Specification for Microchemical Apparatus, Micro Kjeldahl Nitrogen,” Analytical Chemistry, Vol 23, 1951, p. 523