DR/2400
Cyanide
Cyanide_UniCell_Other_PPZ_Eng_Ody.fm Page 1 of 4
• Analyze samples collected in glass or plastic bottles as quickly as possible.
• Adjust pH of preserved samples to between pH 7–10 with 1.0 N Sulfuric Acid Standard Solution before analysis.
• Clean the outside of the vial before placing it in the instrument. Wipe with a damp towel, followed by a dry one.
• Use the standard solution or standard addition method to verify results. See Accuracy Check.
• See Section 3.2.4 on page 40 in the procedure manual for information on adjusting the calibration curve.
• The shelf life of test reagents can be extended to 24 months if kept at 4 °C.
• Make sure that the temperature of the water sample and the sample vial is between 15–25 °C (59–77 °F)
.
• Underrange appears on the display when the instrument is zeroed or when the determined sample concentration is below the
operating range listed for this method.
Cyanide
Cyanogen Chloride*
* Reagent sets for this method are only available in Europe.
UniCell™ Vials
(0.01 to 0.50 mg/L CN
–
)
Scope and Application: For wastewater process control
1. Touch
Hach Programs.
Select program
813 Cyanide, HCT 129
Touch Start.
2. Pipet 2 mL of sample
into a sample vial.
3. Cap with grey
UniCap A (HCT 129 A).
4. Invert the sample vial
repeatedly until the
solids in the cap dissolve
completely.
Tips and Techniques
UniCell™ Vials
Hach Programs
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