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Eco-Efficient Oil-in-Water Testing

ERACHECK ECO combines the inherent advantages of IR methods like a fast and highly precise measurement with the CFC-free and low-cost solvent cyclohexane offering highest precision even for sub-ppm oil-in-water measurements.
Being fully compliant with the advanced standard ASTM D8193, ERACHECK ECO’s cost-efficient and eco-friendly measurement technology provides the most economical alternative for oil-in-water testing on the market.


Correlation to

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Newly Published: The advanced ASTM D8193

ASTM D8193 employs a direct IR transmission measurement of oils and greases in the extraction solvent. The method does not require any solvent evaporation like gravimetric or solventless IR methods and can therefore be used to measure all fractions of the sample, including the light ends. Furthermore, a more complete fraction of extracted hydrocarbons are accessible by this method as compared to GC methods that do not detect fractions eluting outside the defined time window.

Graph that shows ERACHECK ECO's compatibility mode in comparison to ASTM D7678 measurements

Correlation to international standards

With its easy and intuitive operation, ERACHECK ECO enables the straightforward creation of user calibrations and correlations, ensuring excellent correlation with other established oil-in-water methods like the gravimetric method EPA 1664A, IR-methods ASTM D7678, ASTM D7066 and ASTM D3921, as well as the gas chromatography “OSPAR” method ISA 9377-2.

  • ERACHECK ECO showing the measurement menu on the screen
  • ERACHECK ECO showing a running measurement on the screen
  • ERACHECK ECO showing the measurement result on the screen

Measurement Procedure

  1. Extract the water sample with cyclohexane: Typically 900ml water are extracted with 50ml cyclohexane
  2. Select the method you want to use: TPH or TOG
  3. Select the correct calibration
  4. Enter the name of the sample and the name of the operator
  5. Press the RUN button
  6. The instrument runs a background measurement of pure cyclohexane
  7. The instrument measures your extracted sample

ERACHECK ECO guides you through the measurement procedure. The liquid volumes have to be entered depending on the actual volumes used for the extraction of the sample.

ERACHECK ECO Feature Video

  • Ecologically friendly and economical oil-in-water testing
  • CFC-free measurement using cyclohexane for extraction
  • TPH and TOG measurements
  • Fully compliant with ASTM D8193
  • Excellent correlation to EPA 1664, ISO 9377-2, ASTM D3921 and ASTM D7678
  • Limit of detection: 0.5 mg/L oil-in-water

Technical Specifications

Available Test Method
ASTM D8193
Correlation to
Infrared spectroscopy: ASTM 7678, ASTM D3921, D7066; DIN 38409-H18; OSPAR IR method; IP 426
Gas chromatography: ISO 9377-2, ISO 9377-2 (mod) OSPAR, ISO 16703; MADEP-EPH; EN 14039
Gravimetry: EPA 1664, EPA 9071; ASTM 4281; ISO 9377-1
TPH (Total Petroleum Hydrocarbon) and TOG (Total Oil and Grease) measurements in water and soil
Extraction Method
External liquid-liquid or solid-liquid extraction
Extraction Solvent
Sample Volume
Typically 900 mL water and 50 mL cyclohexane (min. 10 mL solvent required per measurement)
Sample Clean-up (TPH)
Simplified removal of polar substances over attachable Florisil® cartridges
Measurement Time
5 min (including background measurement)
Measurement Range
up to 1 000 mg/L oil-in-water
up to 36 000 mg/kg oil-in-soil
Limit of Detection
0.5 mg/L oil-in-water (900:50 mL H2O:Solvent)
18 mg/kg oil-in-soil (20 g:40 mL Soil:Solvent)
Enrichment factor 18 (900:50 mL H2O:Solvent)
0 – 70 mg/L ± 0.35 mg/L
70 – 400 mg/L ± 1.0 mg/L
400 – 1 000 mg/L ± 2.1 mg/L

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