GENERAL55980

• Permit No: M1988112
• IBM Index Class Name: General Documents
• Doc Name: STANDARD TEST METHODS FOR CYANIDE IN WATER AUTOMATED METHODS FOR TOTAL CYANIDE & DISSOCIABLE CYANIDE
• Media Type: D
• Archive: No

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8.3.4 Ethylene Diamine, and Isooctane, Trichlorotripttoro-
ethane, or Hexane. '
8.4 Sodium Hydroxide (NaOH), for preservation and
other preparations:
8.4.1 Stock Solution, I.0 M dissolve 40 g of NaOH in
water and dilute to I L.
8.4.2 Working So/tttion, 0.01 M-Dilute 100 mL of the
stock solution (8.4.1) to 5 L. This solution is used in the
following: (a) absorption of HCN gas, (b) preparation of
cyanide standards, and (c) routine cleaning of the system
manifold.
8.5 Reagents for Standardization:
8.5.1 Silver Nitrate Solution, 0.0191 N Standard (I mL =
1 mg CN-)-Weigh 3.27 g of AgN03 crystals (oven dried),
dissolve in distilled water and dilute to I L. Keep in a dark
container. Standardize against standard sodium chloride
(NaCI) solution using the argentometric method (9) with
potassium chromate (K=Ct0!) indicator. One millilitre of
this solution ° I mg CN.
8.5.2 Ritodamine Indicator-Dissolve 20 mg oC 5-(p-
dimethylaminobenzylidene)rhodanine in L00 mL acetone.-
8.6 Simple Cyanide Standards, Potassium Cyanide, KCN:
8.6.1 Cyanide, Sock Solution, 1.0 g/L CN (Prepared
Fresh Every Month)-ln a 100-mL Oask dissolve 0.251 g of
potassium cyanide (KCN) in about 80 mL water. Add 4 to 5
pellets of sodium hydroxide. Shake well to dissolve, then
dilute [o the mark. One millilitre of this stock E 1 mg CN-.
8.6.2 Standardization oJCyanide Stock Solution (8.6.1)-
Once amonth standardize against the primary standard
silver nitrate titrant using 10 mL o(KCN stock solution and
rhodanine indicator. -
8.6.3 Daily Working Standards, 50 and 100 µg/L CN--
108
With a micropipette take a 100-µL of stock solution and
dilute to 1000 mL with 0.02 M Na011. This will give a
concentration of 100 µg{1. CN. Take anllther 100 µL of the
stock solution and dilute to 2000 mL with 0.02 M NaOH to
obtain 50 µg/L.
8.7 Complex Cyanide Standards-Potassium ferricya-
nide, K3Fe (CN)6, or potassium ferrocyanide, K,Fe (CN)6.3
HzO.
8.7.1 Preparation of Stock Solution, 1 g/L CN (Prepared
Every Week)-Dissolve 0.2109 g of potassium ferricyanide
or 0.2706 g of potassium ferrocyanide trihydrate in distilled
water. Add about four pellets of NaOH, mix well and dilute
to 100 mL. This solution must be ston;d in the dark and
preferably in a dark bottle.
8.7.2 Daily Working Standards, ]00 pg/L CN-With the
micropipette take 100 µL of the stock solution (8.7.1) and
dilute to 1000 mL with 0.02 M NaOH.
8.8 Acid Digestion Mixture-Prepare: I L of the acid
digestion mixture by dissolving 20(1 mL of (85 %)
orthophosphoric acid, 40 mL of (50 °S) hypophosphorus
acid, and 2 g of sulfamic acid in water.
8.9 Reagents jar Color Development:
8.9.1 Phosphate Buffer Solution, (0.6 M), (pH - 4.2)-
Dissolve 83 g of sodium phosphate monobasic in water,
dilute to I L.
8.9.2 Chloramine T Solution, 5%D Stack Solution-Care-
fully dissolve 5.0 g of chloramine-T it water and adjust
volume to 100 mL. Prepare weekly and .;tore in the dark.
8.9.2.1 Dai/y Working Solution, 0.4 %-Dilute 20 mL of
the stock to 250 mL.
8.9.3 Pyridine-Barbituric Acid Color F eagent-Place l5 g
of barbituric acid in a I-L flask, add just enough water to
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