Benchmark TD-550 - Solvent Analysis Method; Equipment Needed; Calibrating the Analyzer for 0-100 Ppm Range

No-Solvent Analysis Method TD-550/560 Oil in Water Analyzer
22 TD-550/560 Oil in Water Analyzer
Operation Manual
PN 106737
REV H
5 NO-SOLVENT ANALYSIS METHOD
NOTE: This analysis method requires special accessories currently under development and
not available for the TD-550/560 at time of manual publication.
The No-Solvent Method makes it possible to perform oil-in-water analyses by making uorescence
measurements directly on the produced water sample. No organic solvents are required. The method
is based upon the addition of a proprietary surfactant (OIW Surfactant) to a produced water sample to
determine the dispersed oil content of the sample. It also provides a measure of the uorescent water-
soluble organic (WSO) compounds.
The analysis is based upon two samples taken from the same water stream. The rst, called the
OIW sample, is a sample of water that has been treated with the OIW Surfactant and ltered into
a measurement cuvette. The OIW sample contains dispersed oil that has been solubilized by the
OIW Surfactant, as well as the WSO present in the water. The second sample, called the WSO (or
background) sample, contains no surfactant. It is simply ltered into a measurement cuvette to remove
dispersed oil, leaving only WSO. Both the OIW and WSO cuvettes are then measured by the TD-
550/560. The dispersed oil concentration is calculated by subtracting the WSO measurement from the
OIW measurement. Dispersed oil is reported in units of parts-per-million (ppm). WSO is reported in units
of dispersed-oil-equivalents. One dispersed-oil-equivalent is the uorescence intensity emitted by 1 ppm
of dispersed oil.
5.1 EQUIPMENT NEEDED
The No-Solvent Method requires a TD-550/560 Oil-in-Water Analyzer and auxiliary equipment available
from Benchmark International. Other common laboratory items can be purchased from a variety of
sources (e.g., VWR International, LLC, www.vwr.com).
To prepare for calibration
1. Label four (4) clean, dry sample bottles 1000 ppm, BLANK, BKG (WSO), and OIW.
2. Label four (4) 8 mm cuvettes 1000 ppm, BLANK, BKG (WSO) and OIW. Conne the labels to
the top 0.5 inch (13 mm) of the cuvette to keep the mark out of the measurement zone.
3. Place 250 mL of tap water in a 600 mL beaker. Place the beaker on a hot plate. Turn on the hot
plate and heat the water until it is near boiling (~180°F, 82°C).
For more details, see the How to Video Library on the Help & Settings screen.
5.2 CALIBRATING THE ANALYZER FOR 0-100 PPM RANGE
To prepare the blank
1. Place 3 mL of OIW surfactant into a 180 mL volumetric ask labeled BLANK.
2. Fill to 100 mL with distilled water and mix until surfactant is completely dissolved.
3. Fill an 8 mm cuvette marked BLANK ½ to ¾ full with the BLANK solution.
4. Make sure the appropriate cuvette adapter is installed in the sample well.