Table of Contents
Advertisement
Accuracy Check
Cyanide_UniCell_Other_PPZ_Eng_Ody.fm
Standard Additions Method (Sample Spike)
Caution: cyanides and their solutions, and the hydrogen cyanide liberated by
acids, are very poisonous. Both the solutions and the gas can be absorbed
through the skin.
1. Prepare a 100-mg/L CN
or an equivalent amount of pure potassium cyanide, in deionized water and
diluting to 1000 mL.
2. Immediately before use, prepare a 10.00-mg/L cyanide working solution by
diluting 10.00 mL of the 100-mg/L stock solution to 100 mL using deionized
water.
3. After reading test results, leave the sample cell (unspiked sample) in the
instrument.
4. Touch
. Touch
Options
additions procedure will appear.
5. Touch
to accept the default values for standard concentration, sample
OK
volume, and spike volumes. Touch
are accepted, the unspiked sample reading will appear in the top row. See
Standard Additions in the instrument manual for more information.
6. Measure 100 mL of sample into three graduated cylinders.
7. Pipet 0.5 mL, 1.0 mL, and 1.5 mL of 10-mg/L CN
cylinders and mix thoroughly.
8. Analyze as described in the procedure. Accept each standard additions
reading by touching
recovery.
9. After completing the sequence, touch
the standard additions data points, accounting for matrix interferences. Touch
, then select
View: Fit
the sample spikes and the "Ideal Line" of 100% recovery
See Section 3.2.2 Standard Additions on page 32 for more information.
Standard Solution Method
1. Analyze a 0.30-mg/L CN
above.
2. To adjust the calibration curve using the reading obtained with the
0.200-mg/L standard solution, touch
Touch
Standard Adjust
3. Touch
. Touch
On
Adjust
depends on the selected chemical form). If an alternate concentration is used,
touch the number in the box to enter the actual concentration, then touch
Touch
.
Adjust
Perform the cyanide procedure as described above. See Section 3.2.4 Adjusting the
Standard Curve on page 40 for more information.
–
stock solution weekly by dissolving 0.2503 grams,
. A summary of the standard
Standard Additions
to change these values. After values
Edit
. Each addition should reflect approximately 100%
Read
Graph
and touch
Ideal Line
OK
–
Standard Solution using the procedure described
Options
.
to accept the displayed concentration (the value
Cyanide
–
, respectively, into the three
to view the best-fit line through
to view the relationship between
on the current program menu.
Page 3 of 4
.
OK
Cyanide
Advertisement
Table of Contents
