Table A2. MDLs obtained when 10 replicate 0.01 g/L 1-L water samples were preconcentrated to 4.0 mL
acetonitrile using either cartridge or disk SPE.
Found concentration (g/L)
Rep
DNB
2,6-DNT
2,4-DNT
TNB
TNT
RDX 4-Am-2,6-DNT
2-Am-4,6-DNT Tetryl
HMX
Waters Porapak RDX Sep-Pak Vac
1
0.0080
0.0052
0.0090
0.0096
0.0131
0.0101
0.0066
0.0120
0.0039
0.0082
2
0.0085
0.0064
0.0078
0.0109
0.0184
0.0064
0.0069
0.0093
0.0100
0.0066
3
0.0099
0.0073
0.0098
0.0131
0.0091
0.0071
0.0079
0.0090
0.0106
0.0102
4
0.0107
0.0081
0.0126
0.0136
0.0245
0.0072
0.0089
0.0102
0.0123
0.0086
5
0.0090
0.0077
0.0102
0.0090
0.0149
0.0067
0.0084
0.0092
0.0123
0.0068
6
0.0120
0.0086
0.0186
0.0146
0.0180
0.0084
0.0092
0.0115
0.0127
0.0098
7
0.0100
0.0077
0.0115
0.0138
0.0236
0.0067
0.0080
0.0094
0.0102
0.0072
8
0.0083
0.0078
0.0100
0.0087
0.0205
0.0107
0.0087
0.0097
0.0117
0.0068
9
0.0099
0.0076
0.0104
0.0128
0.0115
0.0063
0.0082
0.0091
0.0126
0.0072
10
0.0110
0.0085
0.0154
0.0148
0.0201
0.0073
0.0092
0.0095
0.0173
0.0102
Mean
0.0097
0.0075
0.0115
0.0121
0.0174
0.0077
0.0082
0.0099
0.0114
0.0082
Std. dev.
0.0013
0.0010
0.0032
0.0023
0.0051
0.0016
0.0009
0.0011
0.0033
0.0015
MDL
0.0036
0.0029
0.0092
0.0066
0.0144
0.0044
0.0026
0.0030
0.0094
0.0041
Recovery (%)
97
75
115
121
174
77
82
99
114
82
Empore SDB-RPS
1
0.0101
0.0092
0.0197
0.0079
0.0305
0.0255
0.0104
0.0131
0.0148
0.0115
2
0.0076
0.0068
0.0167
0.0069
0.0171
0.0075
0.0078
0.0091
0.0120
0.0070
3
0.0088
0.0087
0.0136
0.0070
0.0167
0.0075
0.0088
0.0100
0.0198
0.0113
4
0.0077
0.0074
0.0117
0.0064
0.0115
0.0068
0.0083
0.0091
0.0136
0.0067
5
0.0080
0.0078
0.0118
0.0060
0.0127
0.0061
0.0080
0.0089
0.0146
0.0074
6
0.0079
0.0077
0.0119
0.0063
0.0104
0.0066
0.0084
0.0093
0.0123
0.0043
7
0.0083
0.0073
0.0100
0.0055
0.0089
0.0056
0.0078
0.0090
0.0108
0.0043
8
0.0075
0.0073
0.0086
0.0059
0.0105
0.0054
0.0078
0.0089
0.0107
0.0046
9
0.0072
0.0065
0.0078
0.0050
0.0073
0.0050
0.0067
0.0075
0.0075
0.0036
10
0.0071
0.0065
0.0088
0.0049
0.0071
0.0052
0.0068
0.0076
0.0084
0.0045
Mean
0.0080
0.0075
0.0121
0.0062
0.0133
0.0081
0.0081
0.0092
0.0124
0.0065
Std. dev.
0.0009
0.0009
0.0038
0.0009
0.0070
0.0062
0.00105
0.0016
0.0035
0.0029
MDL
0.0025
0.0025
0.0106
0.0027
0.0196
0.0174
0.0030
0.0044
0.0100
0.0081
Recovery (%)
80
75
121
62
133
81
81
92
124
65
21