Bonded silica sorbents are commonly used for the solid phase extraction of analytes from complex sample matrices. A variety of functional groups, such as octadecyl (C18) and octyl (C8) can be bonded to the silica surface to provide non polar interactions. Each of these sorbents exhibits unique properties of retention and selectivity for a particular analyte. The choice of which sorbent is best for a particular method will be influenced by the percent recovery of analyte from the sample matrix and the cleanliness of the resulting chromatography.
| Safe Drinking Water Act |
506, 508.1, 525.1, 525.2, 550.1, 1613B |
549.1 |
| Comprehensive and Environmental Response, Compensation, and Liability Act (CERCLA) |
Quick Turnaround Method (QTM) for Organochlorine Pesticides and PCBs |
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| Clean Water Act |
Method 608 Alternate Test Procedure 3M0222 |
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| Clean Water Act - Effluent Guidelines for Pesticide Manufacturing |
507, 508, 525.2, 608 |
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| Resource Conservation Recovery Act (RCRA) |
8061(2nd update), 8081 (3rd update) |
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| Bonded Functional Group |
Octadecyl |
Octadecyl |
Octyl |
| Retention Mechanism |
Strongly non polar |
Strongly non polar |
Moderately non polar |
| Endcapped |
Yes |
Yes |
Yes |
| Percent Carbon (avg.) |
22.5 |
22.5 |
15.5 |
| Pore Size (avg.) |
60 Å |
60 Å |
60 Å |
| Average particle size |
12 µm |
45 µm |
12 µm |
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Product Usage
The versatile Empore™ C18 and C8 products are effective for extracting semi-volatile and nonvolatile organic compounds.
- Approved for use with numerous EPA Methods.
- Empore™ Extraction Disks reduce pollution by reducing the solvent usage.
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Chemical Structure
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