Haloacetic Acids – Drinking Water

• Add 6 mg ammonium chloride (NH4Cl) to an empty vial (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 bottle, tilt, and place under stream.
• Fill the bottle with sample water gently, until the meniscus is level with the bottle top.
• Carefully place the cap on the bottle, eliminating any air.
• Mix gently by hand for 1 minute. 
• DO NOT SHAKE. 
• Store at 4°C.
• Store samples in the dark.

• 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).
• Store samples in the dark.

• Be careful not to add too much dechlorinating agent to the sample because this may cause interference in the analysis.
• Matrix interferences may be caused by contaminants that are coextracted from the sample. The extent of matrix interferences may vary considerably from sample to sample.

If the chlorine residual is >5 mg/L, additional dechlorinating agent is required. For every 5 mg/L of chlorine above the initial 5 mg/L add an additional 6 mg of NH4Cl.

For example: a sample with 10 mg/L chlorine would require 12 mg (6+6) of NH4Cl.

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