InfraCal Model CVH

Sales/Support: (203) 855 9136

The InfraCal Model CVH is recommended for measuring oil in water, TPH in soil or FOG in wastewater concentration levels using the traditional EPA methods 413.2 and 418.1 or ASTM method D7066-04 and Freon-113, hydrocarbon-free grade of perchloroethylene, AK-225, S-316 or other spectroscopic infrared transparent solvent as the extracting solvent. Since the extract is deposited into a 10 mm quartz cuvette cell with Teflon stopper, light end volatile components are retained for measurement. Accurate down to 2 ppm. The Model CVH was one of the instruments used to develop the ASTM method D7066 oil in water method.

To help you with your oil/grease analyses -- whether its oil in water, petroleum hydrocarbons in soil or FOG in wastewater --, we offer Field Sampling Kits that provide all of the accessories necessary for sample preparation and analysis. Please note, we do not sell the solvents for the extraction process, you will need to purchase these separately. Click here for sources for solvents. Please select Ordering Information or Request a Quotation for more information.

If you plan to use the Model CVH with Tetrachloroethylene (Perchloroethylene), the only Tetrachloroethylene we have found that gives consistent results is from J.T. Baker "Ultra Resi-Analyzed" Tetrachloroethylene specifically made for trace hydrocarbon analysis by IR spectroscopy. www.mallbaker.com

Note: The Model CVH-1 which uses 1 mm quartz cuvettes is available, on special order, for high concentration TOG and TPH measurements.

New White Paper!
Emulsion-Breaking Techniques to Ensure Accurate Oil in Water Measurements
Certain types of samples, such as those containing detergent, may form emulsions when doing an oil in water extraction into a solvent. The boundary between the solvent and the sample will have an emulsion layer that has a cloudy or milky appearance as shown in this photo. According to U.S. EPA Method 1664, “if the emulsion is greater than one-third the volume of the solvent layer, the laboratory must employ emulsion-breaking techniques to complete the phase separation”. This is relevant to all oil in water measurements that use liquid-liquid extraction whether the analysis is done by infrared, gravimetric or UV. If such an emulsion cannot be broken by any attempted means, the test method may not give representative results for the problem sample. The best way to break or reduce the emulsion depends on the sample matrix.