N NCG Conc. Taken   Conc. found % Recovery Conc. taken Conc. found % Recovery 208   181.93 87.47 206 169.9142 82.48 616 548.89 89.11 618 559.3464 90.51 1020 910.39 89.25 1030 843.2761 81.87   Mean 88.61   Mean 84.95

Table 3: Recovery data.

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