Recovery studies of NO3 −-N | Recovery studies of TN | ||||
Matrix sample | |||||
Spike level, mg N kg−1 | Found concentration plus 3.6 mg N kg−1 in original sediment | Reference compound | Spike level, g N kg−1 | Found concentration plus 1.54 g N kg−1 in original sediment | Recovery, % |
2.0 | 5.4 | Glycine | 0.400 | 1.98 | 109.7 |
2.0 | 5.4 | ADP | 0.400 | 1.87 | 82.4 |
2.0 | 5.6 | KNO3 | 0.250 | 1.76 | 87.4 |
2.0 | 5.5 | Average recovery | 93.2 | ||
Average recovery, % | 94.7 | ||||
Precision, % | 4.52 | Fortified blank | |||
Reference compound | Spike level, g N L−1 | Found concentration, g N L−1 | Recovery, % | ||
NH4Cl | 0.400 | 0.380 | 94.9 | ||
ADP | 0.400 | 0.394 | 98.4 | ||
KNO3 | 0.250 | 0.251 | 100.4 | ||
Average recovery | 97.9 |