Under the optimized conditions, the calibration graph was
linear over the range of 0.1 – 0.9 mgL-1
with a correlation
coefficient (R
2
) of 0.9999. The observed relative standard
deviation was 1.9% (0.06 mgg-1
, n=11). The limit of detection
calculated from three time of the standard deviation of the blank
was 2.9 x 10-3
mgL-1
(n = 15) and the limit of quantitation was
9.6 x 10-3
mgL-1
(n = 15). The recovery of 98.9 1.9% (0.06
mgg
-1
, n=11) was achieved.