NADP Sample Field Deployment and Hold Times
Deployment Time = Sample “ON date/time” to sample “OFF date/time”Field Hold Time = Sample “OFF date” to date received at lab
Lab Hold Time = Date received to Analysis/Preservation date
* Effective January 2022 and on
| Network | Field Deployment Time Flagged | Field Hold Time Flagged Receipt | Lab Hold Time Flagged Analysis | Preservation | Prep |
|---|---|---|---|---|---|
| NTN | >8 days, 2 hours = QR C (194 hours) | >16 days after off date = QR B >60 days after off date = QR C | >30 days from receipt = QR B | 4-6°C (at lab) | Filtration |
| AMoN | >15 days = QR B (360 hours) >30 days = QR C (720 hours) | >30 days after off date = QR B >60 days after off date = QR C | >30 days from receipt = QR B | Frozen (at lab) | Extraction |
| MDN | >8 days, 2 hours = QR B (194 hours) >15 days = QR C (360 hours) | >16 days after off date = QR B >60 days after off date = QR C | >60 days from BrCl date = QR B | 1% HCl (in field) | Oxidation/Distillation |
| QR = Quality Rating Code |
Quality Rating (QR) Code Definitions:
A – Valid data
B – Valid data with minor problems
C – Invalid data