Automated Analysis of 192 Semivolatile Compounds in Water per 8270E Using GC/MS/MS with PAL3 Sample Preparation: Broad Analyte Coverage, Sub ppb Quantitation, and Reduced Solvent/WasteInnovative Solutions for Reducing Methylene Chloride
Oral Presentation
Presented by A. Andrianova
Prepared by S. Maggi1, A. Calì2, S. Tirat2, M. Beggio2, L. Godina3, G. Premoli1, L. Magno1
1 - LabAnalysis, 5 Via Europa, Casanova Lonati, Lombardy, 27041, Italy
2 - Agilent Technologies, Via Piero Gobetti, 2/C, Cernusco sul Naviglio, MI (Milano), 20063, Italy
3 - Agilent Technologies, Hewlett-Packard-Straße 8, Waldbronn, 76337, Germany
Contact Information: [email protected]; +39 385 287 128
ABSTRACT
Environmental laboratories face pressure to expand semivolatile organic compounds (SVOC) coverage while lowering quantitation limits, shortening turnaround, and reducing solvent use and waste, especially methylene chloride.
In this presentation, we will discuss an EPA 8270E based SVOC workflow that replaces manual sample preparation with a rail robotic platform (PAL) integrated with a GC triple quadrupole (GC/TQ) system. The method automates acidified and basified aliquots and executes a miniaturized, single vial extraction of 5 mL water using only 400 µL DCM, followed by cooled inlet solvent vent sandwich injection (2 µL sample + 0.2 µL ISTD). This approach reduces open handling and total DCM usage, lowers waste, and improves analyst safety and reproducibility.
The automated workflow covers 192 SVOCs in one method – including PAHs, PCBs, pesticides/OPs, PBDEs, chloronaphthalenes, phthalates, phenols, and amines, over a 20-1000 ppt calibration range with accuracies of 80–120%. Replicate spike studies in surface water (10, 50, 100 ng/L; n=10) delivered RSDs ≤10–15% for the majority of analytes, and for priority classes (PAHs/PCBs) precision remained ≤15% at 5 ng/L (n=5). LOQs down to 0.02 ppb (20 ng/L) were achieved for multiple classes, supporting regulatory‑relevant reporting. The selectivity of the method was enabled by the GC/TQ system and high sensitivity was achieved though using a high-efficiency electron ionization source as well as the optimized GC injection parameters.
The automated workflow’s robustness was demonstrated over extended operation with routine liner changes and minimal column maintenance. Collectively, these results show that PAL3‑enabled automation coupled with GC/TQ delivers broad SVOC coverage with low‑ppt quantitation and meaningful reductions in solvent usage, sample handling, and waste – providing an immediately adoptable path for high‑throughput environmental testing labs. This is a demonstrated approach how laboratories can materially reduce methylene chloride use and exposure while achieving low ppt quantitation and efficient in high throughput SVOC testing.
