Synonym(s):
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Carbamates in Water
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Requisition Form
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G-22
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Test Description
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Carbamates insecticides, EPA 531.1
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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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Two glass vials with Teflon (PTFE) lined
screw-caps; 60 mL
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Storage/Preservation Prior to Shipping
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• 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)
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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 531.1
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Turn-around Time
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Samples must be
received by the lab within 7 days of collection, and analyzed by the lab
within 28 days of collection.
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Interferences/Limitations
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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.
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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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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.
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