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Table 1 The recoveries for N species using spiked sediments and reagent water

From: Online zinc reduction-sequential injection analysis for the determination of nitrogen species in extracts of riverine sediment

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