A Simplified Procedure for the Determination of TPH’s in Waters and Soils Using the HC-404 System

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Courtesy of Buck Scientific Inc

The determination of Total Petroleum Hydrocarbons (TPH), greases, and lubricant residues are important environmental and industrial tests. Fuel and lube oils can be determined in water and soils to track spills and storage tank leaks, while many military and industrial situations require certain components (gas regulators, space shuttle components, weaponry parts, etc.) to have a maximum limit of grease or oil on them to prevent potentially hazardous conditions.

These tests are currently done by extracting and washing, respectively, the materials being tested with Freon-113 (Dupont), or equivalent non-hydrocarbon solvent. The extract/wash liquid is placed in a cell and measured in a filter infra-red photometer optimized for ~2940 cm-1 (or ~3.4 microns). Regular Freon Chloro- Fluoro-Carbons have no absorbing bands here, so any signal has to come from the hydrocarbons that are extracted into the Freon.

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