How do you choose the right automated sample preparation system?

Choosing the right automated sample preparation system comes down to matching the system’s capabilities to your specific analytical targets, sample matrices, throughput requirements, and regulatory standards. No single platform suits every laboratory, so the decision requires a structured evaluation of several technical and operational factors. The questions below address the most common decision points laboratories face when selecting a system.

What factors determine which automated sample preparation system fits your lab?

The right automated sample preparation system for your lab is determined by four core factors: the contaminants you analyze, the sample matrices you work with, your required throughput, and the regulatory methods you must follow. Secondary considerations include solvent compatibility, footprint, and whether the system integrates with existing instrumentation.

Start with your analytical scope. A laboratory focused on dioxin and PCB analysis in food and feed has fundamentally different requirements than one running PFAS screening on water samples. Systems designed for persistent organic pollutants need highly selective cleanup columns and precise solvent management, while PFAS-focused systems demand inert flow paths free of materials that could contribute background contamination.

Throughput is equally important. If your lab processes dozens of samples per day, a system capable of running consecutive sequences without manual intervention is essential. Conversely, a smaller lab with variable workloads may benefit more from a flexible, multi-cartridge system than from a high-capacity platform optimized for batch processing.

Finally, consider regulatory alignment. Many environmental and food safety laboratories must comply with EPA, CEN, or ISO methods. Selecting a system that has been validated against these methods, or that can be configured to meet them, reduces the burden of in-house method development and simplifies accreditation audits.

What’s the difference between automated SPE and fully automated extraction systems?

Automated SPE systems handle solid phase extraction, where dissolved samples pass through sorbent cartridges to isolate target analytes. Fully automated extraction systems go further, managing the initial extraction of analytes from solid or semi-solid matrices before cleanup begins. The two system types address different stages of the sample preparation workflow.

In practice, many laboratories need both. Solid or semi-solid samples such as food, feed, soil, or sludge require an extraction step before any purification can take place. Systems based on the Randall principle, for example, perform extraction directly in boiling solvent and can process multiple samples simultaneously while using less than 100 mL of solvent per sample. The extract then moves into a cleanup stage, where an automated SPE or column-based purification system removes co-extracted matrix interferences such as lipids, sulfur, or pigments.

For liquid matrices like water, an automated SPE system alone is often sufficient. Large-volume water extraction platforms can handle sample volumes from tens of milliliters up to one liter, using disk or cartridge formats to concentrate trace-level contaminants before analysis. The key distinction is where in the workflow the automation begins: extraction systems start upstream, SPE systems operate midstream, and the two are frequently used in sequence for complex matrices.

How does solvent consumption affect system selection?

Solvent consumption directly affects laboratory safety, operating costs, and environmental compliance, making it a significant factor in system selection. Systems that reduce organic solvent use below 100 mL per sample offer measurable advantages in all three areas, particularly for laboratories processing high sample volumes or working under sustainability mandates.

Traditional manual extraction methods often require several hundred milliliters of solvent per sample, including solvents such as dichloromethane that carry significant health and disposal concerns. Automated systems that eliminate dichloromethane entirely and cap total solvent use well below 100 mL per sample reduce both exposure risk for laboratory staff and the cost and complexity of solvent waste disposal.

From a regulatory standpoint, many European laboratories are under increasing pressure to demonstrate green chemistry practices. Choosing a system with low solvent consumption supports this goal without compromising analytical performance. When comparing systems, ask vendors for documented solvent consumption figures per sample across the matrices you analyze, and factor in both the extraction and cleanup stages, since each contributes to total solvent use.

What sample matrices can automated preparation systems handle?

Modern automated sample preparation systems can handle a wide range of matrices, including food, feed, soil, sewage sludge, water, and air. The key variable is not the system’s physical capability but whether it has been validated for your specific matrix and target analytes, since matrix complexity directly affects extraction efficiency and cleanup requirements.

Lipid-rich matrices such as fish, meat, and dairy present particular challenges because co-extracted fats must be removed before mass spectrometry detection. Fully automated purification platforms designed for persistent organic pollutant analysis address this by incorporating multi-layer cleanup columns that selectively retain lipids while allowing target compounds to pass through.

Soil and sludge samples introduce different challenges, including high organic matter content and variable moisture levels, which affect extraction efficiency. Systems based on solvent extraction principles can accommodate these matrices but may require method optimization for each soil type. Water samples, by contrast, are generally more straightforward, though large volumes require specialized disk-based or cartridge-based extraction to achieve the sensitivity needed for trace contaminant detection.

When evaluating a system, request application notes or validation data for the specific matrices and contaminants relevant to your work. A system validated for dioxins in fish oil may not perform equivalently on air filter samples without additional method development.

How do you evaluate cross-contamination risk in automated systems?

Cross-contamination risk in automated sample preparation systems is evaluated by examining whether samples come into direct contact with the instrument’s internal components and whether those components are cleaned or replaced between runs. Systems where samples are processed in sealed, single-use formats or where sample contact with the instrument is entirely eliminated offer the lowest contamination risk.

In column-based purification systems for persistent organic pollutants, cross-contamination is a particular concern because the target compounds are present at trace levels, often in the parts-per-trillion range. Even minor carryover from a highly contaminated sample can compromise the integrity of subsequent results. Systems designed so that samples never contact the instrument directly, relying instead on disposable columns or cartridges, eliminate this pathway entirely.

For SPE-based systems handling PFAS, the inertness of the flow path is equally critical. PFAS compounds adsorb readily to many materials, including Teflon, which is commonly used in laboratory tubing. Systems built with fully inert, Teflon-free flow paths prevent analyte adsorption and carryover between samples, which is essential for accurate quantification at low concentrations.

When assessing any automated system, ask vendors to provide blank data from runs performed after high-concentration samples, and review any published validation studies that specifically address carryover. This is a more reliable indicator of real-world contamination risk than general design claims.

When should a lab consider outsourcing sample preparation instead of buying a system?

A laboratory should consider outsourcing sample preparation when sample volumes are too low to justify capital investment in automation, when the required analyses fall outside the lab’s current accreditation scope, or when a temporary surge in workload exceeds in-house capacity. Outsourcing is also a practical option when a lab needs results quickly while evaluating which system to purchase.

The economics of laboratory automation favor high-volume, routine workflows. A system that processes 80 samples per run delivers strong cost-per-sample efficiency when running at or near capacity, but the same system represents poor value if it sits idle most of of the time. For laboratories with irregular or low sample volumes, outsourcing to an ISO 17025 accredited facility provides access to validated methods and internationally recognized reports without the overhead of equipment ownership, maintenance, and staff training.

Outsourcing also makes sense during periods of method development or regulatory transition, when the analytical requirements are not yet stable enough to justify configuring and validating a dedicated system. Once the method is established and sample volumes warrant it, bringing the process in-house with an appropriate automated platform becomes the more cost-effective long-term choice.

How DSP-Systems helps you select and implement the right system

DSP-Systems supports laboratories at every stage of the system selection process, from initial scoping through to installation, validation, and ongoing technical support. Whether you are analyzing dioxins, PCBs, PFAS, pesticides, or other environmental contaminants, DSP-Systems offers a portfolio of automated sample preparation systems matched to a wide range of matrices and regulatory requirements.

Fully automated purification for persistent organic pollutants including dioxins, PCBs, PBDEs, and PCNs across food, feed, soil, water, and air matrices
High-throughput SPE systems capable of processing up to 80 samples per run, compatible with multiple cartridge sizes and sample volumes
Large-volume water extraction in multi-channel configurations for PFAS, pesticides, hormones, and other emerging contaminants
Solvent extraction systems for solid and semi-solid samples, integrated with automated cleanup platforms for a complete workflow
Outsourced analytical services through ISO 17025 accredited partner laboratories, available on a temporary or long-term basis
Method development, validation, and training to support labs building or expanding their analytical capabilities

If you are ready to evaluate which system fits your laboratory’s specific needs, contact DSP-Systems to speak with a specialist.

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