1.1 This procedure covers the determination of diethanolamine, triethanolamine, N-methyldiethanolami
ne and N-ethyldiethanolamin
e (referred to collectively as ethanolamines in this test method) in surface water by direct injection using liquid chromatography (LC) and detected with tandem mass spectrometry (MS/MS). These analytes are qualitatively and quantitatively determined by this test method. This test method adheres to single reaction monitoring (SRM) mass spectrometry.
1.2 This test method has been developed by US EPA Region 5 Chicago Regional Laboratory (CRL).
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 The Detection Verification Level (DVL) and Reporting Range for the ethanolamines are listed in Table 1.
1.4.1 The DVL is required to be at a concentration at least 3 times below the Reporting Limit (RL) and have a signal/noise ratio greater than 3:1. Fig. 1 displays the signal/noise ratios at the DVLs and at higher concentrations for N-methyldiethanolami
ne.
RSD (%)
Diethanolamine
25
24
6
96.34
51.00
156.96
31.31
10.96
32.50
9.49
Diethanolamine
50
24
6
101.41
54.00
154.80
29.54
7.97
29.13
7.91
Diethanolamine
200
24
6
101.57
61.00
138.00
20.98
10.50
20.66
10.85
Diethanolamine
425
24
6
102.06
70.00
138.82
17.98
5.90
17.61
5.70
Triethanolamine
25
24
6
87.70
35.96
157.20
27.00
25.18
30.79
27.48
Triethanolamine
50
24
6
94.95
67.00
121.66
16.39
9.57
17.26
9.66
Triethanolamine
200
22
6
105.00
79.50
132.00
14.06
11.81
13.39
11.52
Triethanolamine
425
24
6
96.94
40.00
144.94
27.56
4.41
28.43
5.76
N-Ethyldiethanolamin
e
25
24
6
90.61
31.00
132.00
39.42
7.47
43.51
10.42
N-Ethyldiethanolamin
e
50
23
6
111.88
49.00
146.00
28.71
7.19
25.66
7.56
N-Ethyldiethanolamin
e
200
24
6
106.20
60.00
134.00
23.09
11.96
21.74
12.23
N-Ethyldiethanolamin
e
425
24
6
99.67
51.00
130.00
23.07
4.68
23.15
6.01
N-Methyldiethanolami
ne
25
24
6
88.43
41.72
133.60
25.24
13.29
28.55
16.70
N-Methyldiethanolami
ne
50
24
6
102.28
56.00
153.80
25.85
8.73
25.27
8.22
N-Methyldiethanolami
ne
200
24
6
101.02
59.00
136.50
20.07
9.51
19.87
9.54
N-Methyldiethanolami
ne
425
24
6
94.75
63.00
115.76
15.02
3.34
15.85
3.72
Diethanolamine-D8 (Surrogate)
200
96
6
103.02
60.00
151.95
21.13
9.40
20.51
9.25
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.1 This procedure covers the determination of diethanolamine, triethanolamine, N-methyldiethanolamine and N-ethyldiethanolamine (referred to collectively as ethanolamines in this test method) in surface water by direct injection using liquid chromatography (LC) and detected with tandem mass spectrometry (MS/MS). These analytes are qualitatively and quantitatively determined by this test method. This test method adheres to single reaction monitoring (SRM) mass spectrometry.
1.2 This test method has been developed by US EPA Region 5 Chicago Regional Laboratory (CRL).
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 The Detection Verification Level (DVL) and Reporting Range for the ethanolamines are listed in Table 1.
1.4.1 The DVL is required to be at a concentration at least 3 times below the Reporting Limit (RL) and have a signal/noise ratio greater than 3:1. Fig. 1 displays the signal/noise ratios at the DVLs and at higher concentrations for N-methyldiethanolamine.
RSD (%)
Diethanolamine
25
24
6
96.34
51.00
156.96
31.31
10.96
32.50
9.49
Diethanolamine
50
24
6
101.41
54.00
154.80
29.54
7.97
29.13
7.91
Diethanolamine
200
24
6
101.57
61.00
138.00
20.98
10.50
20.66
10.85
Diethanolamine
425
24
6
102.06
70.00
138.82
17.98
5.90
17.61
5.70
Triethanolamine
25
24
6
87.70
35.96
157.20
27.00
25.18
30.79
27.48
Triethanolamine
50
24
6
94.95
67.00
121.66
16.39
9.57
17.26
9.66
Triethanolamine
200
22
6
105.00
79.50
132.00
14.06
11.81
13.39
11.52
Triethanolamine
425
24
6
96.94
40.00
144.94
27.56
4.41
28.43
5.76
N-Ethyldiethanolamine
25
24
6
90.61
31.00
132.00
39.42
7.47
43.51
10.42
N-Ethyldiethanolamine
50
23
6
111.88
49.00
146.00
28.71
7.19
25.66
7.56
N-Ethyldiethanolamine
200
24
6
106.20
60.00
134.00
23.09
11.96
21.74
12.23
N-Ethyldiethanolamine
425
24
6
99.67
51.00
130.00
23.07
4.68
23.15
6.01
N-Methyldiethanolamine
25
24
6
88.43
41.72
133.60
25.24
13.29
28.55
16.70
N-Methyldiethanolamine
50
24
6
102.28
56.00
153.80
25.85
8.73
25.27
8.22
N-Methyldiethanolamine
200
24
6
101.02
59.00
136.50
20.07
9.51
19.87
9.54
N-Methyldiethanolamine
425
24
6
94.75
63.00
115.76
15.02
3.34
15.85
3.72
Diethanolamine-D8 (Surrogate)
200
96
6
103.02
60.00
151.95
21.13
9.40
20.51
9.25
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
