Can automated sample preparation reduce solvent consumption?

Yes, automated sample preparation significantly reduces solvent consumption compared to manual methods. Modern automated systems can process samples using less than 100 ml of organic solvent per sample, and many eliminate the need for hazardous solvents like dichloromethane entirely. The sections below unpack exactly how this works, which contaminants benefit most, and when making the switch makes sense for your laboratory.

How much solvent does automated sample preparation actually use?

Automated sample preparation systems typically use fewer than 100 ml of organic solvent per sample. This is a substantial reduction compared to conventional manual extraction methods, which can require several hundred millilitres per sample depending on the matrix and target analyte. The reduction is achieved through precise, programmable solvent delivery that eliminates the excess volumes that manual handling tends to introduce.

In practical terms, systems built on the Randall principle, such as the SER-158, extract solid and semi-solid samples in boiling solvent and simultaneously concentrate them during extraction. Up to six samples can be processed in 23 hours using less than 100 ml of solvent per sample, with excess solvent recovered in a dedicated tank rather than lost to evaporation or disposal. This combination of reduced input and active solvent recovery makes the total solvent footprint far smaller than traditional approaches.

For laboratories running high sample volumes, the cumulative impact is significant: fewer litres of solvent purchased, fewer litres requiring hazardous waste disposal, and lower exposure risk for laboratory staff. Automation does not just reduce solvent use at the point of extraction; it optimises the entire solvent lifecycle across a sample batch.

What solvents are eliminated by modern automated systems?

The most important solvent eliminated by modern automated sample preparation systems is dichloromethane (DCM). DCM has long been a standard extraction solvent for persistent organic pollutants, but it is classified as a substance of very high concern due to its toxicity, volatility, and environmental persistence. Fully automated platforms designed for dioxin, PCB, and PFAS analysis can now achieve equivalent or superior extraction performance without it.

Beyond DCM, automated systems reduce overall dependence on chlorinated solvents more broadly. Many legacy methods relied on large volumes of hexane, toluene, or mixed chlorinated solvent systems that required extensive ventilation infrastructure and generated significant hazardous waste. Automated platforms replace these with smaller, precisely measured volumes of less hazardous alternatives, or with solvent-free steps where solid phase extraction cartridges handle the purification work.

The shift away from DCM in particular is not simply a regulatory response. It reflects a genuine improvement in analytical performance. Automated systems that avoid DCM still meet the extraction efficiency requirements of international standards, including EPA and CEN methods, while reducing the burden on laboratory ventilation, waste disposal contracts, and occupational health monitoring.

How does automation prevent cross-contamination during extraction?

Automated sample preparation prevents cross-contamination primarily by ensuring that samples never come into direct contact with the instrument itself. In systems designed for persistent organic pollutant analysis, the sample is contained within its own vessel throughout the extraction and purification process. The instrument delivers solvents and applies controlled conditions without the sample touching shared internal surfaces that could carry residue from a previous run.

This design principle eliminates one of the most persistent sources of error in manual sample preparation: carry-over between samples. In manual workflows, shared glassware, pipettes, and column hardware must be cleaned between uses, and cleaning failures are a recognised cause of false positives and inflated results, particularly when analysing ultra-trace contaminants like dioxins or PFAS at parts-per-trillion levels.

Automation also removes the variability introduced by different analysts handling samples differently. When extraction conditions, solvent volumes, and timing are programmed and repeatable, the risk of analyst-to-analyst contamination events drops substantially. For laboratories operating under ISO 17025 accreditation, this reproducibility is not just a convenience; it is a quality system requirement. Automated extraction supports audit trails, reduces the frequency of repeat analyses caused by contamination incidents, and improves overall data reliability.

Which contaminant analyses benefit most from solvent-reduced automation?

The contaminant analyses that benefit most from solvent-reduced automation are those targeting persistent organic pollutants (POPs) and emerging contaminants in complex matrices. This includes dioxins (PCDD/Fs), polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), polychlorinated naphthalenes (PCNs), PFAS compounds, and pesticides. These analytes are measured at extremely low concentrations, which means sample preparation quality directly determines whether results are meaningful.

Persistent organic pollutants in food and environmental matrices

Dioxin and PCB analysis in food, feed, soil, sewage sludge, and water requires extensive cleanup to remove co-extracted lipids and other matrix interferences before mass spectrometry measurement. Automated purification systems handle this cleanup with reproducible solvent volumes and controlled conditions, producing cleaner extracts than manual column chromatography while using a fraction of the solvent. Research published by Hayward and Traag in 2020 specifically addressed the challenge of lipid removal before MS measurement of POPs in foods, a problem that automated cleanup systems are well-positioned to address at scale.

PFAS and emerging contaminants in water

PFAS analysis presents a particular challenge because the compounds are so widespread that solvent and equipment contamination is a constant risk. Large-volume water extraction for PFAS, pesticides, hormones, and SVOCs benefits from automated solid phase extraction systems with inert, Teflon-free flow paths. Teflon itself can be a source of fluorinated contamination in PFAS analysis, making fully inert systems a technical requirement rather than a preference. Automated platforms designed for these applications support analysis across cartridge sizes from 1 ml to 12 ml and sample volumes up to 1,000 ml, covering the full range of water monitoring requirements.

What is green chemistry and how does it apply to sample prep?

Green chemistry is a framework for designing chemical processes that reduce or eliminate the use and generation of hazardous substances. In the context of laboratory sample preparation, it means minimising organic solvent volumes, avoiding toxic reagents, recovering and recycling solvents where possible, and reducing energy consumption and waste generation across the analytical workflow.

Applied to sample preparation, green chemistry principles translate directly into the design goals of modern automated systems. Reducing solvent consumption below 100 ml per sample, eliminating DCM, recovering solvent vapour rather than venting it, and concentrating samples efficiently without excess heating are all expressions of green chemistry in practice. These are not aspirational targets; they are measurable, achievable specifications built into current automated platforms.

For laboratories, adopting green chemistry in sample preparation also carries practical regulatory and commercial advantages. Hazardous waste disposal costs are directly proportional to the volumes generated. Occupational exposure limits for organic solvents influence ventilation infrastructure requirements and health monitoring obligations. Reducing solvent use reduces these downstream costs and compliance burdens simultaneously. In 2026, with regulatory scrutiny on laboratory chemical waste increasing across Europe and North America, the alignment between green chemistry and operational efficiency is stronger than ever.

When should a laboratory switch to automated low-solvent preparation?

A laboratory should consider switching to automated low-solvent sample preparation when manual methods are creating bottlenecks in throughput, generating inconsistent results, or consuming solvent volumes that are becoming difficult to justify on cost or compliance grounds. The switch is most compelling when sample volumes are growing, when staff turnover is affecting analytical reproducibility, or when regulatory requirements are tightening around the contaminants being measured.

Laboratories that are expanding into PFAS monitoring, or that are being asked to demonstrate method validation and traceability under ISO 17025, often find that manual preparation cannot reliably meet the precision and documentation requirements that accreditation demands. Automated systems provide the audit trail, the reproducibility data, and the consistent extraction conditions that support both initial validation and ongoing quality assurance.

Cost is often cited as a barrier to switching, but the calculation changes when total cost of ownership is considered. Solvent purchasing, hazardous waste disposal, repeat analyses caused by contamination or analyst error, and the time cost of manual preparation all factor into the real cost of staying with a manual workflow. For laboratories processing more than a modest number of samples per week, automated systems typically reach cost parity within a reasonable operational period, after which the savings compound.

Laboratories that are uncertain whether automation fits their current workload can start with a targeted assessment of where manual preparation is creating the most friction. High-matrix samples, ultra-trace analytes, and multi-residue methods are typically the areas where automation delivers the fastest return.

How DSP-Systems helps laboratories reduce solvent consumption

DSP-Systems supplies and distributes automated sample preparation systems specifically engineered to reduce organic solvent use across a wide range of contaminant analyses. Their portfolio addresses the full extraction and purification workflow, from initial extraction through to final concentration, with systems suited to food, feed, water, soil, and air matrices. Key capabilities include:

The GO-EHT automated purification platform for dioxins, PCBs, PBDEs, and PCNs, using less than 100 ml of solvent per sample and no dichloromethane
The SER-158 extraction system for solid and semi-solid samples, with simultaneous concentration and solvent recovery built into the process
The SPE2000 and AutoEmpore solid phase extraction systems for PFAS, pesticides, hormones, and SVOCs, featuring fully inert, Teflon-free flow paths
Concentration systems including the CentriVap, MultiVap 64, and MultiVap 12 for efficient final-volume reduction with minimal solvent residue
Pre-installation programming, SPE application testing, and configuration to EPA and CEN standards

DSP-Systems works with ISO 17025 accredited laboratories and supports method development, validation, and training to ensure new systems are integrated smoothly into existing workflows. To find out which system fits your laboratory’s sample types and throughput requirements, contact the DSP-Systems team directly.

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