| Synonym(s): |
Glyphosate in Water |
| Requisition Form |
G-22 |
| Test Description |
Glyphosate, EPA Method 547 |
| Pre-Approval Needed |
N/A |
| Supplemental Information Required |
N/A |
| Supplemental Form(s) |
N/A |
| Performed on Specimens from (sources) |
Environmental |
| Sample/Specimen Type for Testing |
Drinking Water |
| Minimum Volume/Size Required |
Dark glass with Teflon (PTFE) cap liners; 60 mL. Collect one vial of drinking water and one vial of reagent water for field blank. |
| Storage/Preservation Prior to Shipping |
- Label each bottle with a waterproof marker.
- Add 100 mg/L sodium thiosulfate to each container (to dechlorinate) (6 mg/60 mL vial).
- 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. Mix for one minute until the sodium thiosulfate is completely dissolved (if solid is used).
- Iced (4°C)
- Store samples away from light.
|
| Transport Medium |
N/A |
| Specimen Labeling |
- Label each bottle with a water proof marker.
- Pre-printing labels is acceptable.
- Sample identification must match information on submission form.
|
| Shipping and Specimen Handling Requirements |
- Ship according to Dangerous Goods Regulations, IATA, and/or CFR 49.
- Ship on ice (4°C).
|
| Method |
EPA 547 |
| Turn-around Time |
Samples must be analyzed by the lab within 14 days of collection. |
| Interferences/Limitations |
- Sampling equipment must be free of plastic tubing, gaskets or other parts that may leach interfering analytes into the sample.
- The extent of matrix interferences may vary considerably from source to source, depending upon the nature and diversity of the matrix being 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 from being handles with bare fingers.
|
| Common Causes for Rejection |
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. |
| Additional Information |
Contact the laboratory at (512) 776-7587 for currently supported analyte list. |