Kjeldahl Nitrogen and Phosphorus Recoveries of Pine Standard.

After switching to the copper catalyst, these are data from the first racks I ran. I post these as an example of what you can expect. The values for the NIST pine needles are; Nitrogen 1.2% and Phosphorus 0.12%.

Date TP% P Rec% TN% N Rec%
05/18/98 0.117 97.50 1.160 96.67
05/18/98 0.119 99.17 1.171 97.58
05/26/98 0.115 95.83 1.148 95.67
05/26/98 0.112 93.33 1.159 96.58
05/27/98 0.122 101.67 1.180 98.33
05/27/98 0.123 102.50 1.176 98.00
05/28/98 0.122 101.67 1.177 98.08
05/28/98 0.124 103.33 1.178 98.17
06/01/98 0.125 104.17 1.182 98.50
06/01/98 0.125 104.17 1.162 96.83
06/02/98 0.123 102.50 1.175 97.92
06/02/98 0.120 100.00 1.198 99.83
06/03/98 0.119 99.17 1.175 97.92
06/03/98 0.119 99.17 1.166 97.17
06/17/98 0.120 100.00 1.063 88.58
06/17/98 0.119 99.17 1.112 92.67
06/18/98 0.122 101.67 1.108 92.33
06/18/98 0.125 104.17 1.119 93.25
09/01/98 0.113 94.17 1.192 99.33
09/01/98 0.125 104.17 1.201 100.08
09/16/98 0.110 91.79 1.162 96.85
09/16/98 0.118 98.60 1.168 97.36
09/18/98 0.122 101.90 1.208 100.68
09/18/98 0.123 102.10 1.224 101.97

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