Featuring Our New Rezin Certified Clean SDVB Resin
- Exceptionally Clean—low background of PAHs.
- Certified for TO-13—PAHs below allowable residual levels in EPA TO-13.
- Easy to Use—a free-flowing resin without messy clumping.
A Resin Family Developed by Air Analysis Experts
From requiring exceptionally low levels of background to being easy to use, Restek’s air chemists understand the challenges labs face when using styrene divinyl benzene (SDVB) resins. Our decades of experience with semivolatile organic compound (SVOC) sampling have helped us develop two resins designed to meet the needs of air analysis labs.
Rezin Certified Clean SDVB Resin
Rezin is a premium, exceptionally clean SDVB resin. A new proprietary cleaning method—designed by our expert chemists—has produced a resin with very low background levels of PAH contaminants. Rezin adsorbent is below the allowable residual PAH levels in EPA method TO-13 and is certified to show it surpasses these method requirements.
Additionally, Rezin adsorbent is specifically developed for use straight from the bottle. Many applications will not require any further cleaning, eliminating the need for labs to perform this costly, time-consuming step.
Clean SVDB Resin
Clean SVDB resin is ideal for labs needing a reliable and economical solution for SVOC sampling. Using the same base resin as our premium Rezin adsorbent, Clean SVDB resin is rigorously cleaned and purged prior to being bottled. For analyses that don’t require the extensive cleanliness and low background levels of contaminants provided by Rezin adsorbent, Clean SVDB resin is a great option.
Exceptional Cleanliness in Every Bottle
Both Rezin certified clean SDVB resin and Clean SVDB resin are used for the active sampling of ambient air and stack gas to collect semivolatile samples. When used for sampling methods, like EPA TO-13 and OTM-45, the cleaned resin is typically placed in a glass holder and held in place with cleaned polyurethane foam plugs or glass frits. Air is pulled through the resin with the aid of a vacuum pump for a set period, after which the resin is removed from the holder and extracted. The extract is then prepared for analysis.
Restek SDVB resins have equivalent physical properties to an XAD-2 resin (Table I).
Table I: Physical Properties of Restek’s Resins
| Particle Parameter | Specification |
| Particle Size Distribution | 20-60 mesh |
| Average Surface Area (m2/g) | 350-360 |
| Average Density (g/mL) | 1.10-1.15 |
| Average Pore Diameter (Å) | 90-100 |
| Average Pore Volume (mL/g) | 0.65 +/- 0.1 |
Traditional SDVB resins have inherently high residues left by the manufacturing process, so they must be cleaned using various solvent washing techniques. The analytes being tested will dictate the cleaning techniques and level of acceptable residues. SDVB resins have a high concentration of naphthalene and other PAHs that must be removed to meet the requirements of methods, such as TO-13. We use TO-13 method requirements to certify our Rezin adsorbent meets or exceeds the expected residue specifications (Table II).
Table II: Excerpt from Rezin Certified Clean Resin’s Certificate of Analysis
| Test | Specification* | Result |
| Naphthalene | <750 ppb | Pass |
| Other PAHs† | <150 ppb each | Pass |
| *PAHs by TO-13 with 20 g of Rezin material used for sampling results in acceptable PAH residue levels. †Acenaphthene, Acenaphthylene, Anthracene, Benz[a]anthracene, Benzo[a]pyrene, Benzo[b]fluoranthene, Benzo[g,h,i]perylene, Benzo[k]fluoranthene, Chrysene, Dibenz[a,h]anthracene, Fluoranthene, Fluorene, Indeno[1,2,3-cd]pyrene, 1-Methylnaphthalene, 2-Methylnaphthalene, Phenanthrene, Pyrene |
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While cleaned resins may have residue levels that are acceptable for specific sampling methods, some residues may remain for other compound classes, necessitating the need for further cleaning. For sampling that requires lower detection limits, Rezin certified clean resin is ideal due to its greatly reduced residues (Table III). Depending on your analysis, it may be possible to use Rezin adsorbent directly from the bottle, or if cleaning is required, it will be less intensive compared to other resins. While Restek’s Rezin adsorbent is certified specifically for PAH levels, it can be used for PFAS, PCB, and dioxin applications.
Table III: Exceptional Cleanliness Brings Exceptional Performance
| Sample | Naphthalene (ppb) | Acenaphthene (ppb) | Other PAH (ppb)* |
| Traditional SDVB Resin | 1900 | 400 | <150 |
| Rezin Certified Clean SDVB Resin | 235 | <150 | <150 |
| *Acenaphthylene, Anthracene, Benz[a]anthracene, Benzo[a]pyrene, Benzo[b]fluoranthene, Benzo[g,h,i]perylene, Benzo[k]fluoranthene, Chrysene, Dibenz[a,h]anthracene, Fluoranthene, Fluorene, Indeno[1,2,3-cd]pyrene, 1-Methylnaphthalene, 2-Methylnaphthalene, Phenanthrene, Pyrene | |||
Exceptionally Easy to Use
Many commercially available resins are not free-flowing, which makes sample handling difficult. Rezin certified clean SDVB resin is purged of residual solvent and sieved and homogenized before packaging. The result is a smooth, free-flowing resin that’s free of clumping, making it easier to use and cleaner for your lab.
