Hanna-instruments HI 4009 Manuel d'utilisateur télécharger pdf (Page 15)

sensor membrane. Store dry disassembled electrode in

storage box provided with electrode.

XVXV

. .

Conversion TConversion T

Conversion T

ablesables

ables

For CNFor CN

For CN

Multiply byMultiply by

Multiply by

Moles/L (M) to ppm (mg/L) 2.602 x 10

ppm (mg/L) to M (moles/L) 3.843 x 10

-5

XVI.XVI.

XVI.

Disposal of CyanidesDisposal of Cyanides

Disposal of Cyanides

Sodium Cyanide is a deadly poison and extreme care must

be taken during use and in disposal after use.

Test solutions and standards may be neutralized before

discharging. Consult your waste manager for exact

procedures. The overview of the process is below.

Caution: Neutralization reactions should be carried out in a

hood.

1) Cyanide is oxidized to cyanate at an elevated pH. pH

and ORP measurements can aid the progress of this

reaction.

+OH

+ HOCl

-> CNO

2) Cyanate is then oxidized to N

and CO

which bubble

off as harmless gases. pH and ORP measurements

can aid this step also.

2CNO

+2OH

+HOCl

->Cl

+2CO

+2H

1 2 ... 10 11 12 13 14 15 16

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Hanna-instruments HI 4009 Manuel d'utilisateur Page 15

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