14 / 73
Ref. No. [UMCES] CBL 2016-010
ACT VS16-01
14
Table 2.
Summary of average offset mg/L DO between paired JFE AroUSB and AroW-USB DO measures and
Winkler reference DO measures during laboratory trials.
Trial ID
AroUSB – Winkler DO
AroW-USB – Winkler DO
mean
s.d.
n
mean
s.d.
n
L_T15_S00
-0.096
0.466
42
-0.183
0.222
24
L_T15_S10
-0.277
0.245
39
-0.100
0.165
39
L_T15_S35
-0.063
0.139
32
-0.169
0.421
38
L_T04_S00
0.265
0.437
39
-0.096
0.191
39
L_T04_S10
0.141
0.237
36
-0.277
0.440
29
L_T04_S35
0.121
0.232
37
-0.145
0.114
37
L_T30_S00
0.071
0.183
40
-0.062
0.251
39
L_T30_S10
0.147
0.534
39
0.134
0.400
39
L_T30_S35
0.169
0.215
40
0.087
0.177
40
The precision of the JFE AroUSB and AroW-USB were also characterized for each of the nine
temperatures and salinity trials (Table 3 and 4, respectively). Precision trials were conducted at the
start of each new tank test when conditions were most stable. Instruments were equilibrated in test
tanks at indicated temperature and salinities for 45 min then the subsequent 31 one minute
measurements were used to estimate average tank DO (mg/L) and its variation over that interval. For
AroUSB the absolute precision, estimated as the standard deviation (s.d.) around the mean, ranged
from 0.002 – 0.014 mg/L across trials with an overall average of 0.004 mg/L. Relative precision,
estimated as the coefficient of variation (CV% = (s.d./mean)x100), ranged from 0.013 – 0.278 percent
across trials with an overall average of 0.058%.
Table 3.
Characterization of the precision of the JFE AroUSB (sn 0091) over a range of temperatures and
salinities.
Trial ID
Temperature
Salinity
Dissolved Oxygen Reading
mg/L mean
mg/L s.d.
CV%
n
L_T15_S00
15.44
0.00
9.382
0.005
0.054
31
L_T15_S10
15.47
8.82
9.516
0.002
0.023
31
L_T15_S35
15.39
34.20
8.324
0.003
0.032
31
L_T04_S00
5.40
0.00
12.485
0.002
0.013
31
L_T04_S10
5.30
8.98
12.218
0.003
0.024
31
L_T04_S35
5.23
34.77
10.747
0.004
0.035
31
L_T30_S00
30.22
0.00
4.919
0.014
0.278
31
L_T30_S10
30.51
9.28
7.063
0.002
0.033
31
L_T30_S35
30.61
34.43
5.984
0.002
0.030
31
Results for the AroW-USB were very similar (Table 4). Absolute precision ranged from 0.001
– 0.012 across trials, with an overall average of 0.004. Relative precision ranged from 0.017 – 0.247
percent across trials with an overall average of 0.051%.