We recently stocked custom EPA Method 541 standards made specifically for labs participating in Unregulated Contaminant Monitoring Rule 4 (UCMR4). Quantitative Certificates of Analysis with Data Packs are available for each item. Email [email protected] or phone 800-356-1688 ext. 3 to place your order (items are not available at Restek.com).
Cat# 572263 – Method 541 UCMR4 Standard (in P&T Methanol)
| Contaminant |
CAS Registry Number |
Minimum Reporting Level |
Standard Concentration |
|---|
| 1-Butanol |
71-36-3 |
2.0 µg/L |
2000 µg/mL |
| 2-Methoxyethanol |
109-86-4 |
0.40 µg/L |
400 µg/mL |
| 2-Propen-1-ol |
107-18-6 |
0.50 µg/L |
500 µg/mL |
Cat# 572267 – Method 541 UCMR4 Surrogate Standard (in P&T Methanol)
| Contaminant |
CAS Registry Number |
Standard Concentration |
|---|
| 1-Butanol-D10 |
34193-38-9 |
50 µg/mL |
Cat# 572268 – Method 541 UCMR4 Internal Standard (in P&T Methanol)
| Contaminant |
CAS Registry Number |
Standard Concentration |
|---|
| Chlorobenzene-D5 |
3114-55-4 |
50 µg/mL |
The analyte concentrations make it easy to prepare calibration levels based on the minimum reporting level (MRL) required by the UCMR4 program. I’ve included example chromatograms collected at the MRL and 10x the MRL using the GC conditions taken from EPA Method 541. The SIM conditions were generated using the AutoSIM feature of MSD Chemstation version D.03.
SIM Analysis of EPA 541 UCMR4 Standard Run at Method Reporting Limit (MRL) on the Stabilwax
SIM Analysis of EPA 541 UCMR4 Standard Run at 10x the Method Reporting Limit (MRL) on the Stabilwax
|
Peaks |
tR (min) |
MRL Conc. (µg/mL) |
10x MRL Conc. (µg/mL) |
|---|
| 1. |
2-Propen-1-ol |
6.94 |
0.013 |
0.13 |
| 2. |
1-Butanol-D10 (SUR) |
7.25 |
0.25 |
0.25 |
| 3. |
1-Butanol |
7.38 |
0.050 |
0.50 |
| 4. |
2-Methoxyethanol |
7.97 |
0.010 |
0.10 |
| 5. |
Chlorobenzene-d5 |
8.66 |
0.25 |
0.25 |
| Stabilwax, 30 m, 0.25 mm ID, 0.50 µm (cat.# 10638) |
| Method 541 UCMR4 Standard (cat.# 572263) |
|
Method 541 UCMR4 Internal Standard (cat.# 572268) |
|
Method 541 UCMR4 Surrogate Standard (cat.# 572267) |
| Dichloromethane |
| 1 µL pulsed splitless (hold 0.50 min) |
| 4 mm Single Taper w/Wool (cat.# 23303) |
| 200 °C |
| 10 psi (68.9kPa) |
| 0.55 min |
| 100 mL/min |
| 30 °C (hold 0.5 min) to 110 °C at 10 °C/min (hold 0 min) to 200 °C at 25 °C/min (hold 6 min) |
| He, constant flow |
| 0.9 mL/min |
| MS |
| SIM |
| Group |
Start Time (min) |
Ion(s) (m/z) |
Dwell (ms) |
|---|
| 1 |
6.000 |
39, 55, 57, 58 |
25 |
| 2 |
7.153 |
41, 43, 46, 50, 55, 56, 63, 64 |
25 |
| 3 |
7.685 |
45, 47, 58, 76 |
25 |
| 4 |
8.292 |
76, 117, 119 |
25 |
|
| 200 °C |
| Quadrupole |
| Stainless Steel |
| 6 mm ID |
| 230 °C |
| 150 °C |
| 6.0 min |
| BFB |
| EI |
| HP6890 GC & 5973 MSD |
