TPH
INTRODUCTION
Total petroleum hydrocarbons index (TPH) is a typical environmental analysis. It has replaced the infrared spectroscopy method using problematic solvents, i.e. Freons. This gas chromatography analysis (GC) monitors hydrocarbons between n-decane and n-tetracontane. These two hydrocarbons are used as the range marker and injection efficiency control. Aditionally, the GC method has an important advantage – this can show a type of hadrocarbon contamination (e.g. gasoline, naphtha, motor oil) and weathering status (some n-alkanes disappear during their stay in the enviroment).
ABSTRACT
GC/FID method for the total petroleum hydrocarbons index (TPH) in the range C10 to C40, a typical environmental analysis, on a LION™ LN-5HT capillary column (15 m × 0.25 mm × 0.10 µm, LNI-5765-FB15). Injection volume 1 µl, injector 300 °C, splitless injection with 1 min hold (split purge 50 ml/min, septum purge 5 ml/min), nitrogen carrier gas at constant flow 1 ml/min. Oven program: 40 °C hold 4 min, then 25 °C/min to 330 °C hold 2.4 min, total run 18 min. FID detection at 350 °C; instrument Master GC (Dani/Perkin-Elmer). The note shows the calibration standard with the C10–C25 and C40 markers, a 5-level calibration (correlation coefficient 0.9989) and the analysis of sewer water with the characteristic unresolved TPH hump. The method has also been developed on a PTV injector.
Industries
Environmental
Category
GC columns
Product
Lion 5HT
Part number
LNI-5765-FB15
Analytes
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- Total petroleum hydrocarbons (C10-C40) CAS number not available
