49
Sulfide–1
13.2 Releasing Agent
300 mL of 9.0 M sulfuric acid releasing agent for the Sulfide–1
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 250 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 g deionized water into the tared 500 mL beaker.
3. Slowly add 276 g concentrated sulfuric acid in increments of 40
g at a time, swirling and allowing to cool after each increment.
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–1.
6. Periodically calibrate the re-pipettor for 1.0 mL as in Method
Cyanide–1.
13.3 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, Methods for Chemical
Analysis of Waters and Wastes, Method 376.2 (Colorimetric,
Methylene Blue), 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”
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