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Reference Standards
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ChemService Pesticide Neats
Internal Standard Mix, EPA 526
- New reference materials for EPA Method 526 facilitate monitoring public water supplies for select List 2 contaminants, Unregulated Contaminant Monitoring Rule
- Full complement of materials for Method 526: calibration standard, internal standard, surrogate standard.
- Rtx®-5Sil MS column offers low GC/MS bleed and excellent inertness.
The US EPA developed GC/MS methodology for screening finished drinking water for selected semivolatile organic compounds not addressed by the Safe Drinking Water Act (SDWA). These Unregulated Contaminant Monitoring Rule (UCMR) List 2* contaminants are part of a screening survey established to determine whether in the future these contaminants should be regulated by standard drinking water methods. Compounds monitored by Method 526 are effectively extracted from water, using 47mm polystyrene divinylbenzene (SDVB) solid phase sorbent, and are sufficiently volatile and thermally stable for GC. The minimum reporting level (MRL) concentration for UCMR List 2 is 0.5µg/L--the value of the lowest concentrations at which precision and accuracy determinations were made during method development.
After careful review of the method we have prepared a Restek calibration standard, as recommended in Method 526, that includes semivolatile organic compounds at 200µg/mL each in ethyl acetate. We also developed internal and surrogate standards. This set of Restek reference materials will meet all chemical standards needs for Method 526.
The majority of the target compounds analyzed through EPA Method 526 are pesticides. Low-level injections reduce sensitivity for many of these compounds, due to degradation or irreversible adsorption in the injection port. Cyanazine, 2,4,6-trichlorophenol, and prometon, for example, are susceptible to adsorption or thermal degradation in the GC inlet. To circumvent inlet problems, we use a deactivated, Drilled Uniliner® liner in the inlet, to significantly reduce sample exposure to the hot metal surfaces of the injection port.**
We highly recommend these reference materials, a Drilled Uniliner® inlet liner, and an Rtx®-5Sil MS column to anyone conducting analyses according to Method 526.
acenaphthene-d10
chrysene-d12
phenanthrene-d10
Quantity Discounts
Order 3 or 4 of any one analytical reference material
product and receive a
10% discount! Order 5 or more
of any one analytical reference material product and
receive a
20% discount!
*For information about UCMR limits, see http://www.epa.gov/safewater/methods/unregtbl.html
**For more information about Drilled Uniliner inlet liners, see our annual products catalog.
