LaMotte SMART Spectro Spectrophotometer - Manual (Page 224)

SURFACTANTS
ION PAIR EXTRACTION–BROMPHENOL BLUE INDICATOR
CODE 4876
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 a * are considered to be potential health hazards. To view
or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD or
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: 0.5–8.0 ppm as Linear Alkyl Sulfonates (LAS).
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 05.04 Surfactants 1/2