1992-05-04_REVISION - M1988112 ‎(3)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 5/4/1992
• Doc Name: CYANIDE DESTRUCTION THE INCO SO2 AIR PROCESS
• Type & Sequence: TR6
• Media Type: D
• Archive: No

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ANALYTICAL -GENERAL
Preoaration of Standards
Sodium Cyanide Stock Standards
1000 ppm CN: Dissolve 1.885 g NaCN and 1 gram NaOH in distilled water and
dilute to 1 litre in a volumetric flask. This is equivalent to 1. mg
CN/mL (1000 µgCN/mL or 1000 ppm CN).
]0 ppm CN: Take 10 mLs of the 1000 ppm CN standard and dilute this to 1
litre in a volumetric flask to yield a l0µgCN/mL stock solution.
Laboratory Workine Standards for Calibration
Take seven (7) 100 volumetric flasks and add 25 mL of buffered picric acid
reagent to each. Then add the cyanide solution and distilled water as given below. Heat
as instructed on the following page. Other standards can be generated but atr: not
required for general operation of the Inco Process.
Note:
Blank: Add 50 mL distilled water.
20 µgCN: Add 2 mL of 10 ppm stock and 48 mL of distilled water.
50 µgCN: Add 4 mL of 10 ppm stock and 45 mL of distilled water.
100 µgCN; Add 8 mL of 10 ppm stock and 40 mL of distilled water.
150 µgCN; Add 12 mL of 10 ppm stock and 35 mL of distilled water.
200 µgCN; Add 16 mL of 10 ppm stock and 30 mL of distilled water.
250 µgCN: Add 25 mL of 10 ppm stock and 25 mL of distilled water.
Standards are to be bulked to exactly 100 mis volume after processed from
hot plate and cooled to room temperature.
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