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Table 1 Distribution of radioactivity in 0–5 cm top soil layer (% aR) after 1 M NaOH extraction

From: Cationic polyacrylamide copolymers (PAMs): environmental half life determination in sludge-treated soil

  Percent of applied radioactivity by days after treatment
1 183 365 578 730 913
Extractable 98.1 ± 1.6 102.6 ± 3.3 83.4 ± 3.7 79.6 ± 1.3 62.9 ± 2.3 63.9 ± 1.1
Non-extractable residues 8.0 ± 1.4 11.3 ± 1.4 10.8 ± 0.9 10.8 ± 0.8 8.4 ± 1.2 8.7 ± 1.1
Recoverya 106.1 113.9 94.2 90.4 71.3 72.6
  1. aRecovery is calculated by summing up amounts in extracts and non-extractables