•   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)

•   Label each bottle with a water proof marker.

•   Pre-printing labels is acceptable. 

•   Sample identification must match submission form.

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

•   Ship on ice (4°C).

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. 

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.