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SULFIDE,
continued
INTERFERENCES
For turbid samples, prepare a sulfide-free blank as follows. Use it in
place of the demineralized water blank in the procedure.
a) Measure 25 mL of sample into a 50-mL erlenmeyer flask.
b) Add Bromine Water dropwise with constant swirling until a yellow
color remains.
c) Add Phenol Solution dropwise until the yellow color just disappears.
Use of this blank solution will compensate for turbidity in the sample.
Strong reducing substances such as sulfite, thiosulfate and hydrosulfite
interfere by reducing the blue color or preventing its development. High
concentrations of sulfide may inhibit full color development and require
sample dilution. Some sulfide loss may occur when the sample is diluted.
SUMMARY OF METHOD
Hydrogen sulfide and acid-soluble metal sulfides react with N,N-
dimethyl-p-phenylenediamine oxalate to form methylene blue. The
intensity of the blue color is proportional to the sulfide concentration.
High sulfide levels in oil field waters may be determined after proper
dilution.
Determine soluble sulfides by centrifuging the sample in completely
filled, capped tubes and analyzing the supernatant. Insoluble sulfides
are then estimated by subtracting the soluble sulfide concentration from
the total sulfide result.
REQUIRED REAGENTS
Sulfide Reagent Set (100 tests) . . . . . . . . . . . . . . . . . . . . . . . . . 22445-00
Includes: (2) 1816-14, (2) 1817-14
Description
Sulfide 1 Reagent . . . . . . . . . . 2 mL . . . . . . 100 mL MDB . . . 1816-32
Sulfide 2 Reagent . . . . . . . . . . 2 mL . . . . . . 100 mL MDB . . . 1817-32
Quantity
Per Test
Unit
61-86
Cat. No.
Cat. No
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