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Table 2 Nitrogen, ammonium and ammonium alum contents of several alum-treated Oseberg wood samples, determined by elemental microanalysis, ATR-FTIR quantification and IC

From: Ammonium alum in alum-treated wooden artefacts: discovery, origins and consequences

Sample Microanalysis ATR-FTIR IC
C/N NH4-alum conc. of alum (mol%) NH4 estimate (mmol/100 g) NH4 (mmol/100 g)
185-F1 4.75    
250-2 68.8    
279-3a 1.70    
410–5 2.22    
229-1B-AR 7.09 17 ± 2 33 ± 4 31.8
229-1C-AR 6.29 18 ± 2 35 ± 4 35.4
229-1D-AR 11.1 18 ± 2 32 ± 4 36.0
229-5-AR 11.3 17 ± 2 31 ± 4 23.7
185-1 10.1 14 ± 2 29a ± 4 25.1a
185-2 8.56 13 ± 2 27a ± 4 25.1a
185-3 9.87 17 ± 2 36a ± 4 15.1a
185-4 8.18 11 ± 2 24a ± 4 38.6a
185-6 3.71 13 ± 2 27 ± 4  
207-powder   84 ± 2 168 ± 4  
296-1   8 ± 2 16 ± 4  
  1. Values marked with a denote quantities per 100 g of aqueous extract, rather than 100 g of total wood sample. The mass of the dried extracts accounted for 85–98% of the mass of the total samples