187
SURFACTANTS, ANIONIC
• Press Zero the display, depending on the measurement phase. After a few seconds, the display
will show “‑0.0‑” when the meter is zeroed and ready for measurement.
• Remove the cuvette.
• Place the reacted sample (#2) into the instrument and close the lid.
• Press Read key to start the reading. The instrument displays the result in mg/L as SDBS.
INTERFERENCES
Cationic surfactants negative interference
Absorption particulate matter negative interference
Sulfide negative interference
Organic sulfates, sulfonates positive interference
Strong oxidants (Cl
2
, H
2
O
2
, S
2
O
8
2‑
, etc.) negative interference
Highly buffered samples or with extreme pH may exceed the buffering capacity of the reagent: pH
should be adjusted between 4 and 9 with diluted NaOH for acidic samples or with diluted HCl for
alkaline samples, prior to addition of the reagent.
#2
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