Table E: Sampling frequency influence | ||||||
Variation between weekly and 4-weekly sampling | ||||||
Dose |
Dose |
|||||
Underestimate |
Overestimate |
|||||
Sample |
Average [U] (ug/L) |
Min deviation |
Max deviation |
Ph1/Ph2 [U] Ratio |
Inverse Min |
|
38 |
9.31 |
0.04 |
2.63 |
0.90 |
23.69 |
|
28 |
1.26 |
0.32 |
3.59 |
0.90 |
3.11 |
|
33 |
1.06 |
0.38 |
2.55 |
0.90 |
2.66 |
|
15 |
114.00 |
0.46 |
1.31 |
0.90 |
2.17 |
|
22 |
5.06 |
0.49 |
1.58 |
0.90 |
2.04 |
|
13 |
18.78 |
0.50 |
2.27 |
0.90 |
2.02 |
|
29 |
0.94 |
0.50 |
1.77 |
1.42 |
2.00 |
|
18 |
3.99 |
0.53 |
1.39 |
0.90 |
1.90 |
|
34 |
0.78 |
0.55 |
2.41 |
1.40 |
1.81 |
|
37 |
48.33 |
0.57 |
1.35 |
1.24 |
1.76 |
|
32 |
0.96 |
0.59 |
2.18 |
0.90 |
1.71 |
|
14 |
2.88 |
0.62 |
1.76 |
0.42 |
1.61 |
|
11 |
84.07 |
0.63 |
1.59 |
0.90 |
1.58 |
|
26 |
0.63 |
0.64 |
2.37 |
0.90 |
1.55 |
|
27 |
0.92 |
0.64 |
1.74 |
0.85 |
1.55 |
|
7 |
128.56 |
0.66 |
1.24 |
0.69 |
1.51 |
|
25 |
0.62 |
0.67 |
2.56 |
0.90 |
1.49 |
|
16 |
21.01 |
0.69 |
2.38 |
0.68 |
1.44 |
|
36 |
12.80 |
0.71 |
1.73 |
2.29 |
1.41 |
|
23 |
18.91 |
0.73 |
1.21 |
0.94 |
1.37 |
|
30 |
0.53 |
0.74 |
1.44 |
0.94 |
1.34 |
|
6 |
a |
3.19 |
0.75 |
1.25 |
0.90 |
1.33 |
10 |
23.24 |
0.75 |
1.26 |
0.90 |
1.32 |
|
39 |
22.01 |
0.77 |
1.40 |
0.90 |
1.30 |
|
8 |
58.77 |
0.77 |
1.36 |
0.90 |
1.30 |
|
24 |
0.52 |
0.79 |
1.52 |
0.90 |
1.26 |
|
35 |
1.55 |
0.81 |
1.30 |
2.02 |
1.23 |
|
7 |
a |
214.71 |
0.84 |
1.22 |
0.87 |
1.18 |
20 |
0.57 |
0.85 |
1.23 |
0.90 |
1.18 |
|
6 |
3.14 |
0.85 |
1.19 |
0.62 |
1.17 |
|
5 |
31.38 |
0.85 |
1.18 |
0.87 |
1.17 |
|
12 |
243.42 |
0.88 |
1.36 |
0.35 |
1.13 |
|
2 |
20.50 |
0.88 |
1.23 |
0.90 |
1.13 |
|
3 |
36.18 |
0.91 |
1.06 |
0.93 |
1.10 |
|
21 |
7.33 |
0.91 |
1.16 |
0.90 |
1.10 |
|
1 |
156.54 |
0.93 |
1.09 |
0.90 |
1.07 |
|
31 |
0.42 |
0.94 |
1.13 |
0.90 |
1.07 |
|
19 |
2.96 |
0.94 |
1.19 |
0.90 |
1.06 |
|
9 |
73.39 |
0.95 |
1.05 |
0.90 |
1.05 |
|
17 |
48.85 |
0.99 |
1.60 |
0.90 |
1.01 |
|
4 |
38.28 |
0.99 |
1.02 |
0.90 |
1.01 |
|
* Data printed in bold are measured, others are estimated from the "global" mean | ||||||