Cyanide (total) – Drinking Water

Laboratory Fee Schedule
Group: Inorganic
Procedure #:  EZZ0031A

Synonym(s):  Cyanide in potable Water
Requisition Form G-22
Test Description The determination of total available cyanide, which is the sum of the strong acid dissociable, weak acid dissociable, and free cyanide, in samples of drinking water. 
Pre-Approval Needed No
Supplemental Information Required N/A
Supplemental Form(s) N/A
Performed on Specimens from (sources) Environmental
Sample/Specimen Type for Testing Drinking water
Minimum Volume/Size Required 1 L
Storage/Preservation Prior to Shipping
  • Store in hard or soft plastic or glass container.
  • Measure and record the chlorine residual.
  • Add 100 mg of ascorbic acid to dechlorinate sample and as much sodium hydroxide necessary to achieve pH between 12.0-12.5.
  • Maintain sample at 4.0°C.
  • Some headspace is allowed.
Transport Medium
  •  Ascorbic acid
  • Sodium hydroxide
Specimen Labeling Sample identification must match submission form.
Shipping and Specimen Handling Requirements
  • Must be tested by laboratory within 14 days of collection. 
  • Ship according to Dangerous Goods Regulations, IATA, and/or CFR 49.
Method QuikChem 10-204-00-1-X 
Turn-around Time N/A
Interferences/Limitations Some known interferences are as follows:
  • aldehydes, nitrate-nitrite, and oxidizing agents, which can decompose most cyanides; and
  • substances that might contribute color or turbidity. 
Common Causes for Rejection
  • Insufficient quantity
  • unacceptable specimen type or source
  • improper shipping conditions
  • expired media or collection container
  • discrepancies between specimen label and submission form
  • incomplete or missing submission form
Additional Information N/A