Supelpak™-2SV Adsorbent Improves Environmental Sampling and Recovery of Difficult Semivolatile Compounds

By: Jim Walbridge, Reporter EU Volume 20

Jim Walbridge jwalbridge@sial.com

Supelco is please to announce the availability of its newest adsorbent, Supelpak-2SV. This new adsorbent is optimized for the sampling and analysis of semivolatile pollutants, dioxins, furans, polynuclear aromatic hydrocarbons (PAHs) and chlorinated pesticides. Supelpak-2SV provides enhanced recovery of difficult compounds such as pentachlorophenol (PCP) and dinitrophenols and hence lower detection limits. Background levels from the adsorbent are low enough to eliminate the need for precleaning, saving valuable time and money.

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Background

Environmental analysts analysing semivolatile pollutants according to various established methods (1) are required to collect samples using Amberlite XAD®-2 resin. These methods specify laborious, time-consuming cleaning procedures to reduce background contaminants on XAD-2 to acceptable levels. Analysts often find the need to process “precleaned” XAD-2 even further to reduce background levels so that lower detection limits can be obtained by GC-MS analysis. Additionally, difficult compounds such as PCP and dinitrophenols must show high recoveries following extraction by XAD-2.

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Improved Cleaning Process

For many years, Supelco has offered XAD-2 as well as Supelpak-2 and Supelpak-2B, precleaned versions of XAD-2, meeting cleanliness requirements of specific environmental sampling methods (2). The Supelpak-2 series of resins has evolved to provide our customers with adsorbents that have lower background levels and increased recoveries for specific analytes. Our newest resin, Supelpak-2SV, is a dry and more higher purified version of XAD-2. Supelpak-2SV was developed specifically for the extraction and recovery of semi-volatile organic compounds from environmental samples. Produced using a proprietary cleaning process, Supelpak-2SV exhibits typical background levels of contaminants less than 1μg/g of resin measured as total chromatographable organics (TCO). Table 1 shows the low background levels extracted from Supelpak-2SV as analysed on an EquityTM-5 capillary GC column

Table 1. Typical Background Levels Extracted from Supelpak-2SV and Competitors Products


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Improved Performance of Supelpak-2SV

Used directly from the bottle, Supelpak-2SV requires no costly in-house cleaning before use and is superior to other “precleaned” XAD-2 resins, even after additional cleaning.Used directly from the bottle, Supelpak-2SV requires no costly in-house cleaning before use and is superior to other “precleaned” XAD-2 resins, even after additional cleaning.This results in savings in both lab time and hazardous solvent waste generation, disposal and associated costs. Characterisation by GC-MS has also shown Supelpak-2SV resin an excellent choice for semivolatile priority pollutants, PCBs, PAHs and dioxins/ furans. A study of extraction efficiencies using a wide range of semivolatile compounds demonstrated recoveries >90% even for substituted phenols. Table 2 shows typical recoveries of substituted phenols from Supelpak-2SV compared to competitive products. Customers also appreciate other aspects of the product such as the availability of large single-lot batches of up to 10 kg. This significantly reduces a laboratory’s labour for internal qualification for each lot of adsorbent.

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Table 2. Typical Recoveries of Phenols from Supelpak-2SV


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Conclusions

Produced using proprietary cleaning procedures, Supelpak-2SV, a dry and more highly purified version of XAD-2, offers environmental analysts significantly lower background levels of organic contaminants eliminating the need for further cleaning prior to use. Notoriously difficult compounds such as PCP and dinitrophenols show extraction recoveries typically greater than 90% on Supelpak-2SV, improving the accuracy and reliability of analytical results. Your laboratory will save considerable time and money by switching to Supelpak-2SV for your environmental sample collection and extraction needs. Supelpak-2SV can be ordered in three different package sizes to meet your usage requirements

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Materials

     

References

  1. US EPA SW-846, Method 0010, Method 8270C; California Air Resources Board (CARB) Methods 428 and 429, EPA Compendium Method TO-13A.
  2. Supelpak-2 meets US EPA recommended criteria for purity in Level I Environmental Assessment Procedures Manual and as outlined in EPA SW-846, Method 10; Supelpak-2B meets EPA requirements for determining PCBs in water according to the Great Lakes National Program Office (GLNPO).

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