Prep Method
EPA 3005A — Acid digestion for ICP-MS metals
Batch ID
DIG-2026-0142
Analyst
mvasquez
Digestion Date/Time
2026-06-15 17:30
Hot block
DigiPREP 48 · #DGP-02 · 95 °C
Reagents
HNO₃ conc. (Lot 2026-A14) · HCl conc. (Lot 2026-B22) · DI water (Type I)
Batch composition
7 vessels•••
| Vessel # | Sample / QC | Type | Initial Vol | Final Vol | Spike | Status | |
|---|---|---|---|---|---|---|---|
| 1 | MB-0003 | Method Blank | 50 mL | 50 mL | — | Complete | |
| 2 | LCS-2026-0142 | LCS | 50 mL | 50 mL | 500 µg/L all | Complete | |
| 3 | LCSD-2026-0142 | LCSD | 50 mL | 50 mL | 500 µg/L all | Complete | |
| 4 | GW-0009 | Sample | 50 mL | 50 mL | — | Complete | |
| 5 | GW-0009-MS | Matrix Spike | 50 mL | 50 mL | 500 µg/L Zn,Pb,Cd | Complete | |
| 6 | GW-0009-MSD | Matrix Spike Dup | 50 mL | 50 mL | 500 µg/L Zn,Pb,Cd | Complete | |
| 7 | GW-0010 | Sample | 50 mL | 50 mL | — | Complete |
Procedure (auto-tracked from SOP)
Step 1 — 17:30
Aliquot 50.0 mL of each sample into Teflon vessel ✓
Step 2 — 17:35
Add 5.0 mL HNO₃ conc. (Lot 2026-A14) ✓
Step 3 — 17:40
Add 2.5 mL HCl conc. (Lot 2026-B22) ✓
Step 4 — 17:45
Heat at 95 °C for 2 h on DGP-02 ✓ (verified: 95.2 °C)
Step 5 — 19:50
Cool to room temp, bring to 50.0 mL with DI water ✓
Step 6 — 19:55
Filter through 0.45 µm, transfer to ICP-MS vial ✓
Step 7 — 20:05
Send batch to instrument queue ✓ → ICP-MS Run 20260616-01