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Synonym(s):
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Synthetic Organic Contaminants in Water
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Requisition Form
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G-22
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Test Description
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Synthetic organic contaminants group 5,
EPA methods 508.1 and 525.2, Semi-volatile organic compounds by GC-MS and chlorinated
pesticides and PCBs by GC-ECD in drinking water
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Pre-Approval Needed
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N/A
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Supplemental Information Required
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N/A
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Supplemental Form(s)
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N/A
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Performed on Specimens from (sources)
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Environmental
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Sample/Specimen Type for Testing
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Drinking Water
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Minimum Volume/Size Required
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Narrow-mouth (or wide mouth) amber glass
with Teflon (PTFE) cap liner; 1 quart (1 L)
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Storage/Preservation Prior to Shipping
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- Add
50 mg of sodium sulfite (Na2SO3) to the empty container (dechlorinating agent)
- 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
half the container with sample water. Mix gently until sodium sulfite is
completely dissolved.
- Add 3
to 4 mL 6N HCl in order to achieve a pH of < 2. (HCl is used as a
preservative)
- Finish
filling the container (to shoulder) and seal. A small amount of head space is
acceptable.
- Mix
for one minute.
- Store
at 4°C.
- Store
samples in the dark from time of collection until extraction
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Transport Medium
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N/A
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Specimen Labeling
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- Label
each bottle with a water proof marker.
- Pre-printing labels is acceptable.
- Sample
identification must match submission form.
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Shipping and Specimen Handling Requirements
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- Ship according to
Dangerous Goods Regulations, IATA, and/or CFR 49.
- Ship on ice (4°C).
- Store
samples in the dark from time of collection until extraction
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Method
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EPA 508.1 &
525.2
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Turn-around Time
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Samples must be
extracted by the lab within 14 days of collection.
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Interferences/Limitations
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- Be careful not to add too much Na2SO3to
the sample because this may cause interference in the analysis.
- Sampling equipment must be free of plastic
tubing, gaskets or other parts that may leach interfering analytes into the
sample.
- 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.
- Organic acids in
field samples will co-elute with the target compounds. The organic acids spectra will affect the
target compound spectral purity.
- Some polycyclic
aromatic hydrocarbons (PAH), including the labeled PAHs used in this method
as internal standards, are rapidly oxidized and/or chlorinated in water
containing residual chlorine.
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| Common Causes for Rejection
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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
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Additional Information
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1) Laboratory QC duplicates are required
for samples. One in ten samples should be collected in triplicate. For the
sample to be triplicated, add the words “+DUP” The sample and duplicates will
be submitted with only one analysis form.
2) If the chlorine residual is >5 mg/L,
additional dechlorinating agent is required. For every mg/L of chlorine above
the initial 5 mg/L add an additional 10 mg of Na2SO3.
For example: a sample with 7 mg/L chlorine
would require 70 mg of Na2SO3.
Be careful not to add too much Na2SO3 to
the sample because this may cause interference in the analysis.
3) If you must collect a confirmation
sample for prometon, you will NOT add the acid.
Ensure the submission form is labeled well
stating “PROMETON, NO ACID”.
Contact the laboratory at (512) 776-7587
for currently supported analyte list.
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