April 2010, Sunnyvale, CA-Dionex announces new methods for the extraction of oil and grease from water samples using the Dionex AutoTrace® 280 system in disk and cartridge configurations. Liquid-liquid extraction (LLE) and solid-phase extraction (SPE) are proven techniques that meet the requirements of EPA 1664A. Compared to LLE, SPE is more reliable, less labor-intensive, and uses less solvent. The AutoTrace 280 SPE instrument provides an automated, solid-phase extraction solution that replaces traditional liquid-liquid extraction and meets the requirement of EPA 1664, Revision A. The AutoTrace 280 SPE instrument is available in both disk and cartridge configurations to suit the needs of every laboratory.

Application Note 817: EPA Method 1664A-Extraction of Oil and Grease from Water Samples Using AutoTrace 280 Solid-Phasedemonstrates solid-phase extraction (SPE) in cartridge configuration to extract oil and grease from Extraction Cartridge Configuration water samples in accordance with the EPA Method 1664, Revision A.

Application Note 818: EPA Method 1664A-Extraction of Oil and Grease from Water Samples Using AutoTrace 280 Solid-Phasedemonstrates solid-phase extraction (SPE) in disk configuration to extract oil and grease from water Extraction Disk Configuration samples in accordance with the EPA Method 1664, Revision A.

These methods, released in March 2010, show excellent recovery and precision, and replace tedious and labor-intensive liquidliquid extraction.

For more information visit www.dionex.com or contact your local Dionex Representative.

Dionex (NASDAQ:DNEX) is a global leader in the manufacturing and marketing of liquid chromatography and sample preparation systems, consumables, and software for chemical analysis. The company's systems are used worldwide in environmental analysis and by the life sciences, chemical, petrochemical, food and beverage, power generation, and electronics industries. Our expertise in applications and instrumentation helps analytical scientists to evaluate and develop pharmaceuticals, establish environmental regulations, and produce better industrial products.

AutoTrace is a registered trademark of Dionex Corporation.