Table 1
Results of persistence and kinetic model parameters of fomesafen and quizalofop-ethyl dissipation in soil and soybean plant at two treatment doses (T1 and T2) in Season I (S1) and Season II (S2)
Compound
|
Kinetic model
|
Parameters
|
Soil
|
Plant
|
T1 (S1)
|
T2 (S1)
|
T1 (S2)
|
T2 (S2)
|
T1 (S1)
|
T2 (S1)
|
T1 (S2)
|
T2 (S2)
|
Fomesafen
|
SFO
|
a (mg kg-1)
|
0.092
|
0.166
|
0.102
|
0.178
|
0.225
|
0.457
|
0.247
|
0.481
|
b (day-1)
|
0.146
|
0.141
|
0.111
|
0.110
|
0.180
|
0.177
|
0.166
|
0.163
|
R2
|
0.979
|
0.990
|
0.979
|
0.981
|
0.943
|
0.965
|
0.982
|
0.987
|
χ2Error (%)
|
5.20
|
4.07
|
5.80
|
5.52
|
9.68
|
8.94
|
5.48
|
5.22
|
Half-life (days)
|
4.74
|
4.91
|
6.24
|
6.28
|
3.86
|
3.91
|
4.17
|
4.26
|
|
|
|
|
|
|
|
|
|
|
DFOP
(Best fit model)
|
a (mg kg-1)
|
0.012
|
0.019
|
0.014
|
0.023
|
0.076
|
0.132
|
0.041
|
0.067
|
b (day-1)
|
2.028
|
2.587
|
4.027
|
2.427
|
1.365
|
1.135
|
1.289
|
2.339
|
c (mg kg-1)
|
0.085
|
0.156
|
0.096
|
0.168
|
0.174
|
0.366
|
0.220
|
0.442
|
d (day-1)
|
0.130
|
0.129
|
0.101
|
0.101
|
0.124
|
0.134
|
0.142
|
0.145
|
R2
|
0.988
|
0.998
|
0.991
|
0.989
|
0.994
|
0.990
|
0.992
|
0.996
|
χ2Error (%)
|
3.76
|
1.77
|
3.69
|
4.02
|
3.09
|
4.52
|
3.49
|
2.72
|
Half-life (days)
|
4.23
|
4.49
|
5.42
|
5.62
|
2.84
|
2.89
|
3.71
|
3.81
|
Compound
|
Kinetic model*
|
Parameters
|
Soil
|
Plant
|
T1 (S1)
|
T2 (S1)
|
T1 (S2)
|
T2 (S2)
|
T1 (S1)
|
T2 (S1)
|
T1 (S2)
|
T2 (S2)
|
Quizalofop-ethyl
|
SFO
(Best fit model)
|
a (mg kg-1)
|
0.034
|
0.055
|
0.035
|
0.053
|
0.071
|
0.140
|
0.081
|
0.161
|
b (day-1)
|
0.428
|
0.407
|
0.419
|
0.386
|
0.397
|
0.391
|
0.365
|
0.353
|
R2
|
0.994
|
0.999
|
0.997
|
0.999
|
0.988
|
0.999
|
0.998
|
0.998
|
χ2Error (%)
|
2.40
|
1.11
|
1.65
|
1.01
|
3.12
|
1.28
|
1.45
|
1.76
|
Half-life (days)
|
1.63
|
1.70
|
1.66
|
1.83
|
1.76
|
1.77
|
1.90
|
1.96
|
*The DFOP kinetic model didn’t fit with quizalofop-ethyl dissipation |
Table 2
Chronic dietary and soil ecological risk assessment of fomesafen at two treatment doses (T1 and T2) in Season I and II
Season I
|
Dose
|
Days
|
Dietary risk assessment
|
Soil ecological risk assessment
|
Dose
|
Days
|
Dietary risk assessment
|
Soil ecological risk assessment
|
RQd (a)a
|
RQd (c)b
|
Algae
|
EWc
|
APd
|
RQd (a)a
|
RQd (c)b
|
Algae
|
EWc
|
APd
|
T1
|
0
|
0.104
|
0.139
|
28.57
|
0.0010
|
0.0010
|
T2
|
0
|
0.207
|
0.276
|
51.56
|
0.0018
|
0.0018
|
1
|
0.073
|
0.097
|
22.71
|
0.0008
|
0.0008
|
1
|
0.155
|
0.207
|
40.94
|
0.0014
|
0.0014
|
2
|
0.056
|
0.075
|
18.23
|
0.0006
|
0.0006
|
2
|
0.119
|
0.158
|
34.67
|
0.0012
|
0.0012
|
3
|
0.051
|
0.068
|
16.80
|
0.0006
|
0.0006
|
3
|
0.099
|
0.131
|
31.51
|
0.0011
|
0.0011
|
4
|
0.046
|
0.061
|
15.39
|
0.0005
|
0.0005
|
4
|
0.091
|
0.121
|
28.05
|
0.0010
|
0.0010
|
5
|
0.040
|
0.054
|
13.90
|
0.0005
|
0.0005
|
5
|
0.083
|
0.110
|
23.85
|
0.0008
|
0.0008
|
7
|
0.027
|
0.036
|
10.54
|
0.0004
|
0.0004
|
7
|
0.064
|
0.086
|
19.10
|
0.0006
|
0.0006
|
10
|
0.023
|
0.031
|
6.48
|
0.0002
|
0.0002
|
10
|
0.045
|
0.060
|
12.90
|
0.0004
|
0.0004
|
13
|
0.014
|
0.018
|
3.65
|
0.0001
|
0.0001
|
13
|
0.024
|
0.032
|
8.52
|
0.0003
|
0.0003
|
|
|
|
|
|
|
15
|
0.012
|
0.016
|
5.60
|
0.0002
|
0.0002
|
Season II
|
Dose
|
Days
|
Dietary risk assessment
|
Soil ecological risk assessment
|
Dose
|
Days
|
Dietary risk assessment
|
Soil ecological risk assessment
|
RQd (a)a
|
RQd (c)b
|
Algae
|
EWc
|
APd
|
RQd (a)a
|
RQd (c)b
|
Algae
|
EWc
|
APd
|
T1
|
0
|
0.109
|
0.145
|
32.46
|
0.0011
|
0.0011
|
T2
|
0
|
0.212
|
0.283
|
55.93
|
0.0019
|
0.0019
|
1
|
0.086
|
0.115
|
25.64
|
0.0009
|
0.0009
|
1
|
0.163
|
0.217
|
45.39
|
0.0015
|
0.0015
|
2
|
0.068
|
0.090
|
22.11
|
0.0008
|
0.0008
|
2
|
0.134
|
0.178
|
39.12
|
0.0013
|
0.0013
|
3
|
0.059
|
0.079
|
20.61
|
0.0007
|
0.0007
|
3
|
0.119
|
0.158
|
35.29
|
0.0012
|
0.0012
|
4
|
0.053
|
0.070
|
19.20
|
0.0007
|
0.0007
|
4
|
0.106
|
0.141
|
33.27
|
0.0011
|
0.0011
|
5
|
0.047
|
0.063
|
17.56
|
0.0006
|
0.0006
|
5
|
0.092
|
0.122
|
30.38
|
0.0010
|
0.0010
|
7
|
0.036
|
0.049
|
15.00
|
0.0005
|
0.0005
|
7
|
0.069
|
0.092
|
26.74
|
0.0009
|
0.0009
|
10
|
0.023
|
0.030
|
10.92
|
0.0004
|
0.0004
|
10
|
0.045
|
0.060
|
19.22
|
0.0007
|
0.0007
|
13
|
0.010
|
0.014
|
7.44
|
0.0003
|
0.0003
|
13
|
0.025
|
0.034
|
12.68
|
0.0004
|
0.0004
|
15
|
-
|
-
|
5.31
|
0.0002
|
0.0002
|
15
|
0.015
|
0.020
|
10.02
|
0.0003
|
0.0003
|
17
|
-
|
-
|
3.88
|
0.0001
|
0.0001
|
17
|
-
|
-
|
6.25
|
0.0002
|
0.0002
|
aRQd (a): Dietary risk quotient for adult; bRQd (c): Dietary risk quotient for child; cEW: Earthworm; dAP: Soil arthropods
|
Table 3
Chronic dietary and soil ecological risk assessment of quizalofop-ethyl at two treatment doses (T1 and T2) in Season I and II
Season I
|
Dose
|
Days
|
Dietary risk assessment
|
Soil ecological risk assessment
|
Dose
|
Days
|
Dietary risk assessment
|
Soil ecological risk assessment
|
RQd (a)a
|
RQd (c)b
|
Algae
|
EWc
|
APd
|
RQd (a)a
|
RQd (c)b
|
Algae
|
EWc
|
APd
|
T1
|
0
|
0.069
|
0.092
|
1.70
|
0.007
|
0.035
|
T2
|
0
|
0.136
|
0.181
|
2.73
|
0.011
|
0.056
|
1
|
0.044
|
0.059
|
1.12
|
0.004
|
0.023
|
1
|
0.089
|
0.119
|
1.77
|
0.007
|
0.037
|
2
|
0.033
|
0.044
|
0.68
|
0.003
|
0.014
|
2
|
0.062
|
0.083
|
1.23
|
0.005
|
0.025
|
3
|
0.020
|
0.027
|
0.51
|
0.002
|
0.011
|
3
|
0.043
|
0.058
|
0.80
|
0.003
|
0.016
|
|
|
|
|
|
|
4
|
0.028
|
0.037
|
-
|
-
|
-
|
Season II
|
Dose
|
Days
|
Dietary risk assessment
|
Soil ecological risk assessment
|
Dose
|
Days
|
Dietary risk assessment
|
Soil ecological risk assessment
|
RQd (a)a
|
RQd (c)b
|
Algae
|
EWc
|
APd
|
RQd (a)a
|
RQd (c)b
|
Algae
|
EWc
|
APd
|
T1
|
0
|
0.078
|
0.104
|
1.75
|
0.007
|
0.036
|
T2
|
0
|
0.155
|
0.207
|
2.65
|
0.011
|
0.055
|
1
|
0.055
|
0.073
|
1.15
|
0.005
|
0.024
|
1
|
0.106
|
0.141
|
1.82
|
0.007
|
0.038
|
2
|
0.036
|
0.048
|
0.72
|
0.003
|
0.015
|
2
|
0.077
|
0.103
|
1.20
|
0.005
|
0.025
|
3
|
0.027
|
0.036
|
0.53
|
0.002
|
0.011
|
3
|
0.056
|
0.074
|
0.85
|
0.003
|
0.018
|
4
|
0.018
|
0.025
|
-
|
-
|
-
|
4
|
0.036
|
0.048
|
-
|
-
|
-
|
|
|
|
|
|
|
5
|
0.027
|
0.036
|
-
|
-
|
-
|
aRQd (a): Dietary risk quotient for adult; bRQd (c): Dietary risk quotient for child; cEW: Earthworm; dAP: Soil arthropods