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Synonym(s):
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PCBs as Decachloribiphenyl in Water
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Requisition Form
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G-22
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Test Description
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PCB SOC6 EPA method 508A:
Determination of total
polychlorinated biphenyls as Decachlorobiphenyl equivalent 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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Measure and record the
chlorine residual
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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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Collect triplicate (3) samples. Narrow-mouth 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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- No chemical preservation reagents are recommended.
- 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 bottles to 90-95% full
- Store at 4°C
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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.
- Ship on ice (4°C).
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Method
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EPA 508A
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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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Collection
containers should be meticulously cleaned.
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.
This method is
prone to false positives. In addition
to PCBs, several compounds and classes of compounds will form DCB with
varying yields when extracted and perchlorinated according to this procedure.
Based upon a literature search such compounds include biphenyl,
polyhalogenated
biphenyls, hydrogenated biphenyls, and polyhalogenated terphenyls. If such
compounds are present in the extract, false positive or positively biased
data will be generated.
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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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This sample is collected for confirmation
when an Aroclor is detected by screening method 508.1. Contact laboratory in advance to see if
reagents are available for testing due to high method blanks.
Contact the laboratory at (512) 776-7587
for currently supported analyte list.
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