Carbamates – Drinking Water

Laboratory Fee Schedule
Procedure #:  EZZ0093A


Carbamates in Water

Requisition Form

Carbamates insecticides, EPA 531.1

Pre-Approval Needed


Supplemental Information Required


Supplemental Form(s)


Performed on Specimens from (sources)


Sample/Specimen Type for Testing

Drinking Water

Minimum Volume/Size Required

Two glass vials with Teflon (PTFE) lined screw-caps; 60 mL.

Storage/Preservation Prior to Shipping

  • Label each vial with a waterproof marker.

  • Add 1.8 mL of monochloroacetic acid buffer* to each empty vial.

  • Add 5 mg of sodium thiosulfate (or an equivalent of freshly prepared sodium thiosulfate solution) to each of the empty vials (to dechlorinate).  

  • Open the tap and allow the system to flush until the water temperature stabilizes, at least 5 minutes. Turn flow down to a smooth, pencil thin stream.

  • Remove cap from the vial, tilt, and place under stream.

  • Fill the vials with water and seal.

  • Shake vigorously for 1 minute.

  • Duplicates are required; collect one duplicate for every ten samples.

  • Iced (4°C)

Transport Medium


Specimen Labeling

  • Label each bottle with a water proof marker.

  • Pre-printing labels is acceptable. 

  • Sample identification must match submission form.

Shipping and Specimen Handling Requirements

  • Ship according to Dangerous Goods Regulations, IATA, and/or CFR 49.

  • Ship on ice (4°C).


EPA 531.1

Turn-around Time

Samples must be received by the lab within 7 days of collection, and analyzed by the lab within 28 days of collection.


Matrix interference may be caused by contaminants that are present in the sample. The extent of matrix interference will vary considerably from source to source, depending upon the water sampled.

Method interferences may be caused by contaminants, especially amines and ammonia, in reagents, sample bottles and caps, and other sample processing hardware that lead to discrete artifacts and/or elevated baselines in chromatograms.  The samples may be contaminated by being handled with bare fingers. 

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, and/or incomplete or missing submission form.

Additional Information

Prepare by mixing 156 mL of 2.5 M monochloroacetic acid and 100 mL 2.5 M potassium acetate.


Contact the laboratory at (512) 776-7587 for currently supported analyte list.