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- W1965514441 abstract "After semimicro Kjeldahl digestion of the coal sample with a K(2)SO(4)-V(2)O(5)-Se catalyst and sulphuric acid, the digest is cooled, diluted with water, neutralized and then made alkaline with NaOH/EDTA solution. The ammonia thus formed is determined by measuring the potential of a properly conditioned ammonia-sensitive electrode containing an appropriate filling solution; a gravimetric standard-addition technique is used. Known additions of 1-2 mug of N per g to blank solutions enables all measurements of potential to be made in the linear region of the electrode-response curve. The electrode measurement procedure gives blank-corrected recoveries of between 99.0 and 101.0% for synthetic sample solutions. Results obtained for nitrogen in reference coal samples by the electrode procedure have been found to agree well with those obtained by other methods." @default.
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- W1965514441 date "1984-08-01" @default.
- W1965514441 modified "2023-09-26" @default.
- W1965514441 title "Standard-addition determination of nitrogen in coal with an ammonia-sensitive electrode" @default.
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- W1965514441 doi "https://doi.org/10.1016/0039-9140(84)80178-2" @default.
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