For a 500L sample volume, linear response was attained within 0.50–25.0 mg L
−1
, described by the equationA
=−0.049 + 0.078 C (mg L
−1
),r= 0.999. The detection limit
was estimated as 0.10 mg L
−1
at the 99.7% confidence level
and the coefficient of variation was 0.7% (n= 20).