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. Contact Customer Service 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

 

Column	Stabilwax, 30 m, 0.25 mm ID, 0.50 µm (cat.# 10638)
Sample	Method 541 UCMR4 Standard (cat.# 572263)
	Method 541 UCMR4 Internal Standard (cat.# 572268)
	Method 541 UCMR4 Surrogate Standard (cat.# 572267)
Diluent:	Dichloromethane
Injection
Inj. Vol.:	1 µL pulsed splitless (hold 0.50 min)
Liner:	4 mm Single Taper w/Wool (cat.# 23303)
Inj. Temp.:	200 °C
Pulse Pressure:	10 psi (68.9kPa)
Pulse Time:	0.55 min
Purge Flow:	100 mL/min
Oven
Oven Temp.:	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)
Carrier Gas	He, constant flow
Flow Rate:	0.9 mL/min
Detector	MS
Mode:	SIM
SIM Program:	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
Transfer Line Temp.:	200 °C
Analyzer Type:	Quadrupole
Source Type:	Stainless Steel
Drawout Plate:	6 mm ID
Source Temp.:	230 °C
Quad Temp.:	150 °C
Solvent Delay Time:	6.0 min
Tune Type:	BFB
Ionization Mode:	EI
Instrument	HP6890 GC & 5973 MSD

 

This entry was posted on Thursday, March 23rd, 2017 at 12:36 am and is filed under Enviro, GC/MS, Optimizing Applications. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.