LaMotte SMART3 Colorimeter - Manual (Page 283)

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: 0.0–8.0 ppm as Linear Alkyl Sulfonates (LAS)
MDL: 1.0
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 surfactants and nonionic surfactants.
SMART3 Test Procedures 8.13 SURFACTANTS
Test P
rocedures