53
Sulfide–2
sample period. If the sample is not analyzed immediately, seal
both ends of the tube with Parafilm.
14.2 Sources
• U.S. Environmental Protection Agency, Methods for Chemical
Analysis of Waters and Wastes, Method 376.1 (Titrimetric,
Iodine), EPA–600, 4–79–020, Revised March 1983.
• U.S. Environmental Protection Agency, Test Methods for
Evaluating Solid Wastes (SW–846) Method 9030B, Revision 2,
December 1996, “Acid-soluble and acid-insoluble sulfides:
distillation”.
• U.S. Environmental Protection Agency, Test Methods for
Evaluating Solid Wastes (SW–846) Method 9215, Revision 0,
December 1996, “Potentiometric determination of sulfide in
aqueous samples and distillates with ion-selective electrode”
14.3 Releasing Agent
300 mL of 9.0 M sulfuric acid releasing agent for the Sulfide–2
Micro Dist Method:
Make this releasing solution up in a beaker under the hood and
transfer to the automatic re-pipettor supplied with the starter kit after
cooling. This is enough to treat 600 samples.
CAUTION
Chemical burn hazard. Upon the addition of sulfuric acid to
water, the solution will become very hot. Never add water to
concentrated acid. When preparing this reagent, follow these
steps very carefully.
ATTENTION
Risque de brûlure chimique. Lorsque de l'acide sulfurique
(H
2
SO
4
) est ajouté à de l'eau, la température de la solution
augmente rapidement. N'ajoutez jamais d'eau dans de l'acide
concentré. Lorsque vous préparez ce réactif, suivez ces
étapes avec précaution.
1. In the hood, place a 500 mL beaker onto a top loading balance
with a 800 g capacity or greater. Tare the balance.
2. Place 150.0 g deionized water into the tared 500 mL beaker.
3. Add slowly 276 g concentrated sulfuric acid in increments of 40
g sulfuric acid while swirling. Allow to cool.
4. Allow the solution to cool to room temperature in the hood.
5. When the solution is at room temperature, transfer to the
automatic re-pipettor and screw the cap on tightly. Prime the
pipet, and the solution is ready to use in method Sulfide–2.
6. Monthly, calibrate the re-pipettor to 0.45 mL.
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