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Synonym(s):
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Endothall in Water
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Requisition Form
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G-22
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Test Description
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Endothall, EPA method 548.1
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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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Amber glass bottle with Teflon (PTFE) cap
liner; 1 quart (1 L)
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Storage/Preservation Prior to Shipping
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- Add 80 mg of sodium thiosulfate to the
empty container (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 container with sample water.
Shake vigorously for one minute until the sodium thiosulfate is completely
dissolved.
- Iced (4°C)
- Store samples away from light
or heat.
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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).
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Method
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EPA 548.1
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Turn-around Time
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Samples must be extracted by the lab
within 7 days of collection.
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Interferences/Limitations
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- Sampling equipment must be free of plastic
tubing, gaskets or other parts that may leach interfering analytes into the
sample.
- The major potential interferences in this
ion-exchange procedure are other naturally occurring ions in water sources,
namely, dissolved calcium, magnesium and sulfate.
- Matrix interferences may be caused by
contaminants that are coextracted from the sample. Matrix interferences will
vary considerably from source to source, depending on the nature of the
matrix being sampled. The most
probable matrix interferences are other organic acids or phenols retained by
the column.
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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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Contact the laboratory at (512) 776-7587
for currently supported analyte list.
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