Cyanide
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 8 of 8 Cyanide_PP_Other_PPZ_Eng_Ody.fm
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2. Immediately before use, prepare a 0.200 mg/L cyanide working solution by
diluting 2.00 mL of the 100 mg/L stock solution to 1000 mL using
deionized water.
3. To adjust the calibration curve using the reading obtained with the
0.200 mg/L standard solution, touch
Options on the current program menu.
Touch
Standard Adjust.
4. Touch
On. Touch Adjust to accept the displayed concentration (the value
depends on the selected units). If an alternate concentration is used, touch the
number in the box to enter the actual concentration, then touch
OK. Touch Adjust.
See Section 3.2.4 Adjusting the Standard Curve on page 40 for more information.
Method Performance
Precision
Standard: 0.120 mg/L CN
–
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Summary of Method
The Pyridine-Pyrazalone method used for measuring cyanide gives an intense
blue color with free cyanide. A sample distillation is required to determine
cyanide from transition and heavy metal cyanide complexes. Test results are
measured at 612 nm.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
Cyanide Reagent Set .......................................................................................................................................24302-00
Includes:
(1) CyaniVer
®
3 Cyanide Reagent Powder Pillows.......................1 pillow........... 100/pkg.............21068-69
(1) CyaniVer
®
4 Cyanide Reagent Powder Pillows.......................1 pillow........... 100/pkg.............21069-69
(1) CyaniVer
®
5 Cyanide Reagent Powder Pillows.......................1 pillow........... 100/pkg.............21070-69
Required Apparatus
Cylinder, graduated, 10-mL ....................................................................1 ....................... each........................508-38
Sample Cells, 10-mL, w/cap...................................................................2 ....................... 6/pkg.................24276-06
Required Standards
Potassium Cyanide, ACS................................................................................................... 125 g.......................767-14
Water, deionized ................................................................................................................. 4 liters ....................272-56
Program 95% Confidence Limits of Distribution
160 0.110–0.130 mg/L CN
–
Portion of Curve ∆Abs ∆Concentration
Entire range 0.010 0.001 mg/L CN
–
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