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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