Can laboratory automation reduce organic solvent consumption?

Organic solvents have always been a necessary part of environmental contaminant analysis, but the volumes traditionally required raise serious concerns for laboratory safety, cost, and environmental impact. As regulatory pressure intensifies and sustainability becomes a genuine operational priority, laboratories analyzing persistent organic pollutants (POPs), PFAS, and pesticides are increasingly turning to laboratory automation as a practical path toward reducing solvent consumption without compromising analytical quality. The answer to whether automation can make a meaningful difference is clear: it already does, and the results are measurable.

This article examines how conventional sample preparation compares to modern automated approaches, what drives solvent reduction across different matrices, and why cross-contamination control and Teflon-free flow paths are becoming non-negotiable in analytical laboratories today.

How much solvent traditional sample preparation uses

Manual sample preparation for persistent organic pollutant analysis has historically consumed substantial volumes of organic solvents. A single sample processed through conventional liquid-liquid extraction or manual Soxhlet extraction can require anywhere from 200 ml to well over 500 ml of solvents such as hexane, acetone, or dichloromethane. When multiplied across a batch of 20 or 30 samples, the cumulative solvent volume becomes a significant operational burden.

The reliance on dichloromethane (DCM) is particularly problematic. DCM is classified as a substance of very high concern in several regulatory frameworks, and its use in laboratory environments requires stringent ventilation, personal protective equipment, and careful waste disposal. Beyond the health and safety implications, the sheer cost of purchasing, storing, and disposing of large solvent volumes adds up quickly. For high-throughput laboratories running dioxin, PCB, or PBDE analysis routinely, this is not a minor inconvenience but a structural inefficiency built into the workflow.

Traditional cleanup steps, including manual column chromatography with silica, alumina, or carbon layers, compound the problem further. Each additional purification step typically introduces more solvent, more hands-on time, and more opportunities for variability between analysts and between runs.

How automated systems cut solvent use below 100 ml per sample

Modern laboratory automation approaches the solvent problem from a systems design perspective rather than simply optimizing individual steps. Fully automated sample preparation platforms integrate extraction, cleanup, and concentration into a single controlled workflow, eliminating the redundant solvent additions that accumulate during manual processing.

The GO-EHT system from Miura Institute of Environmental Science is a well-documented example of this approach. Designed specifically for the purification of samples analyzed for dioxins, PCBs, PBDEs, and PCNs, the system reduces organic solvent consumption to less than 100 ml per sample without requiring dichloromethane at any stage. This is achieved through precisely controlled solvent delivery, automated column switching, and integrated concentration steps that recover and reuse solvents within a closed-loop architecture.

The SER-158 extraction system follows a similar principle. Based on the Randall extraction method, it performs extraction directly in boiling solvent followed by a hot Soxhlet or Twisselmann step, processing up to six samples in 23 hours while using less than 100 ml of solvent per sample. Solvents are simultaneously recovered into a dedicated tank during extraction, minimizing residual solvent and reducing the time needed for downstream concentration. The combination of speed, precision, and reduced solvent consumption makes this approach substantially more efficient than its manual equivalents.

For PFAS SPE automation, the SPE2000 platform offers a complementary solution. Processing up to 80 samples in a single run across ten consecutive sequences of eight samples simultaneously, the system handles sample volumes from 10 ml up to 1,000 ml and is compatible with 1 ml, 3 ml, 6 ml, and 12 ml cartridges. This level of throughput, combined with tightly controlled solvent delivery, dramatically reduces per-sample solvent volumes compared to manual solid-phase extraction protocols.

Solvent reduction across different sample matrices

One of the practical challenges in environmental contaminant analysis is that different sample matrices behave very differently during extraction and cleanup. Food and feed samples with high fat content require more aggressive cleanup than water samples, while soil and sediment matrices present their own extraction challenges. The question of whether solvent reduction is achievable across this diversity of matrices is therefore important.

Automated systems designed for POPs analysis have demonstrated consistent solvent reduction across a wide range of matrices, including food, feed, soil, sewage sludge, water, and air. The GO-EHT platform, for instance, has been validated across all of these matrix types, with peer-reviewed publications documenting its performance for dioxin and PCB analysis in food and feed matrices as well as more complex environmental samples.

Water and large-volume matrices

Water analysis presents a particular challenge because large sample volumes are often required to achieve adequate detection limits for trace-level contaminants. The AutoEmpore system addresses this through automated large-volume extraction using disk and cartridge formats, with support for 25 mm, 47 mm, and 90 mm disks and automatic online filtration and water removal. Available in 3, 6, 9, or 12-channel configurations operating in parallel or series mode, it delivers the throughput needed for PFAS, pesticide, and SVOC analysis in water matrices without the solvent volumes associated with manual large-volume liquid-liquid extraction.

Concentration after extraction

Reducing solvent use during extraction is only part of the equation. After cleanup, samples typically need to be concentrated to a precise end volume before injection. Systems such as the CentriVap benchtop vacuum centrifuge and the MultiVap parallel evaporation platforms handle this step efficiently, processing large numbers of samples simultaneously under controlled conditions. The MultiVap 12, for example, delivers 20% higher throughput than its predecessor and supports both evaporation to dryness and concentration to a defined end volume, covering the full range of downstream needs without requiring a fume hood thanks to its integrated vapor evacuation system.

Cross-contamination risk and Teflon-free flow paths

Solvent reduction is only one dimension of the automation advantage. Cross-contamination control is equally critical, particularly when analyzing ultra-trace contaminants such as dioxins, PCBs, and PFAS, where contamination at the part-per-trillion level can invalidate results or trigger false positives.

In manual sample preparation, samples come into direct contact with shared glassware, tubing, and column hardware. Even with rigorous cleaning protocols, residual contamination from previous samples or from the materials themselves can introduce bias. This is especially relevant for PFAS analysis, where Teflon-based components in laboratory equipment are a well-recognized source of background contamination. Teflon releases fluorinated compounds into samples, creating interference that is difficult to distinguish from genuine contamination in the sample.

The LabTech SPE systems address this directly through fully inert flow paths that are free of Teflon and resistant to all organic solvents. This design makes them particularly well-suited for PFAS SPE automation, where material compatibility is not a secondary consideration but a fundamental requirement for valid results.

For POPs analysis using the GO-EHT platform, the design principle is different but equally effective: samples do not come into direct contact with the system at any point during purification. This eliminates the primary route for cross-contamination and removes the need for the extensive between-sample cleaning procedures that manual workflows require. The result is not only cleaner results but also higher throughput, because the time lost to cleaning and verification steps is recovered.

Regulatory and sustainability drivers behind solvent minimization

The push toward reduced solvent use in analytical laboratories is not driven by technology alone. Regulatory frameworks across Europe and North America are tightening restrictions on hazardous solvent use in occupational settings, and environmental regulations governing solvent waste disposal are becoming more stringent. Laboratories operating under ISO 17025 accreditation are also under increasing pressure to demonstrate that their methods meet not only analytical performance criteria but also environmental and safety standards.

The European Green Deal and related chemical strategy initiatives have placed persistent organic pollutants and PFAS at the center of regulatory attention, driving demand for monitoring programs that require more frequent analysis of more matrices. This creates a volume pressure that makes solvent-intensive manual methods increasingly impractical, both economically and logistically.

Green analytical chemistry, as a discipline, advocates for methods that minimize reagent consumption, reduce waste generation, and eliminate or substitute hazardous substances wherever possible. Automated sample preparation systems that operate without dichloromethane, recover solvents during extraction, and process samples at scale represent a direct application of these principles in routine laboratory practice. As monitoring requirements expand in 2026 and beyond, the ability to scale up analysis without proportionally scaling up solvent consumption will be a meaningful competitive and compliance advantage for laboratories investing in automation now.

How DSP-Systems helps laboratories reduce solvent consumption

DSP-Systems supplies and distributes a carefully selected range of automated sample preparation systems specifically designed for laboratories analyzing environmental contaminants. As an official European and North American distributor for Miura Institute of Environmental Science and LabTech, DSP-Systems provides access to platforms that directly address the solvent reduction, cross-contamination, and throughput challenges described in this article.

GO-EHT purification systems for dioxin, PCB, PBDE, and PCN analysis, using less than 100 ml of solvent per sample without dichloromethane
SER-158 extraction system for solid and semi-solid matrices, with integrated solvent recovery and full compatibility with GO-EHT cleanup
SPE2000 and AutoEmpore platforms for high-throughput PFAS, pesticide, and emerging contaminant analysis, featuring Teflon-free inert flow paths
CentriVap and MultiVap evaporation systems for efficient post-cleanup concentration across a wide range of sample volumes
Pre-installation configuration, SPE application testing, and method support aligned with EPA and CEN standards

Whether a laboratory is looking to reduce its environmental footprint, improve analytical reliability, or scale up monitoring capacity without increasing solvent costs, DSP-Systems offers the expertise and equipment to make that transition practical. Contact DSP-Systems to discuss which automated solution fits your matrix types, throughput requirements, and compliance needs.