Nitrate + Nitrite – Drinking water

Laboratory Fee Schedule
Group: Inorganic
Procedure #:  EZZ0047A

Synonym(s):  Nitrate and nitrite as nitrogen in potable water
Requisition Form G-22
Test Description The determination of nitrite singly, or nitrate and nitrite combined in drinking water samples. 
Pre-Approval Needed N/A
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 100 mL
Storage/Preservation Prior to Shipping •    Store in hard or soft plastic or glass container.
•    Measure and record the chlorine residual.
•    Maintain sample at 4.0°C.
•    Some headspace is allowed.
Transport Medium N/A
Specimen Labeling Sample identification must match submission form.
Shipping and Specimen Handling Requirements •    Samples without chlorine residuals must be tested by laboratory within 48 hours of collection.
•    Samples submitted for nitrite analysis must be tested by laboratory within 48 hours of collection. 
•    Ship according to Dangerous Goods Regulations, IATA, and/or CFR 49.
Method Automated colorimetry (EPA method 353.2) 
Turn-around Time  
Interferences/Limitations Some known interferences are as follows: 
•    residual chlorine; 
•    high concentrations of iron, copper, or other metals; 
•    high concentrations of oil or grease; and 
•    excessive 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