Table 1: Design data allowable crosswind (ACC) and tailwind.
Parameters |
After CPE |
Before CPE |
Amount of ethanol |
0.2 |
--- |
pH |
3.5 |
3.5 |
Optimum [aluminon] |
1.5 × 10-4 |
3.0 × 10-4 |
Reaction time (min) |
5.0 |
20 |
Stirring time (min) |
5.0 |
---- |
λmax (nm) |
538 |
518 |
Working range (mg/ml) |
7.5 - 220 |
5000 - 235000 |
Ringbom range (ng/ml) |
25 - 205 |
7500 - 200000 |
Molar absorptivity (L/mol.cm) |
1.92 × 107 |
1.65 × 104 |
Sandell sensitivity (ng/cm2) |
0.0033 |
0.45 |
Regression equation a |
|
|
Slope |
3.02 |
0.0027 |
Intercept |
0.005 |
- 0.009 |
Correlation coefficient (r) |
0.99926 |
0.9965 |
RSD a (%) |
1.75 |
3.90 |
Detection limits (ng/ml) |
2.20 |
1500 |
Quantification limits (ng/ml) |
7.40 |
4950 |
Preconcentration factor |
500 |
--- |
Improvement factor |
1165 |
--- |
a: A = a + bC, where C is the concentration of Cu2+ in mg/ml.