LaMotte SMART Spectro Spectrophotometer - Manual (Page 250)

SURFACTANTS
ION PAIR EXTRACTION–BROMPHENOL BLUE
INDICATOR METHOD • CODE 4876-01
QUANTITY CONTENTS CODE
50 g pH Adjustment Powder 4509- H
10 g Sodium Chloride Reagent 4877-D
2 X 60 mL *DS Indicator Reagent *4508-H
1 Spoon, 0.5 g, plastic 0698
1 Spoon, 0.1 g, plastic 0699
1 Pipet, 1.0 mL, plastic 0354
*WARNING: Reagents marked with an * are considered to be potential health
hazards. To view or print a Material Safety Data Sheet (MSDS) for these reagents
go to www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail,
phone or fax.
Aqueous waste from households and industrial laundering operations is the main
source of surfactants in waters. Surfactants are found in low concentrations in
natural water except in areas of an outfall or other point source.
APPLICATION: Surface water, wastewater.
RANGE: 0.00–8.0 ppm as Linear Alkyl Sulfonates (LAS).
MDL: 1.0 ppm
METHOD: The presence of LAS in the water sample causes the
transfer of bromphenol blue dye from the organic
reagent layer to the aqueous layer. The amount of color
in the aqueous layer is proportional to the concentration
of the LAS in the sample. LAS are Methylene Blue
Active Substances (MBAS). This calibration is based on
sodium lauryl sulfate (dodecyl sodium sulfate). Some
linear alkyl sulfonates may have a slightly different
response. Prepare standards of a known concentration
and follow the test procedure below to determine a
conversion factor.
SAMPLE HANDLING
& PRESERVATION:
Analyze samples as soon as possible. May be stored
at 4°C for 24 hours. Warm to room temperature before
testing.
INTERFERENCES: Cationic and non-ionic surfactants.
SMART Spectro Test Procedures 8.13 SURFACTANTS
Test P
rocedures