PROCESS-WATER CHARACTERIZATION USING DISCRETE ANALYZERS AND ION CHROMATOGRAPHY

Importance of the topic

Process (non-potable) water is central to many industrial operations and must meet strict quality requirements to avoid equipment corrosion, product defects, and production losses. Reliable, rapid, and cost-effective characterization of process water supports preventative maintenance, compliance, and process optimization. Combining high-throughput discrete analysis with targeted ion chromatography addresses both routine multi-parameter screening and trace-level, matrix-challenged determinations that are critical for modern industrial water management.

Study goals and overview

This webinar-style whitepaper describes analytical strategies for comprehensive process-water characterization by integrating automated discrete analyzers with ion chromatography (IC). It outlines capabilities, typical workflows, and representative performance data to show how the two approaches complement each other: discrete analysis for routine, high-throughput screening and IC for trace, speciation, and matrix-challenged analyses. The material highlights instrument features, method adaptations to increase throughput or selectivity, and combined solutions that reduce operational burden while improving data quality.

Methodology and approach

• High-throughput discrete photometric and electrochemical analysis: Automated platforms perform parallel assays on microliter-scale aliquots with fully automated reagent handling, incubation, and detection to produce routine water quality results quickly and with minimal operator training.
• Ion chromatography (IC): Configurable IC systems using small-particle IonPac columns and suppressed conductivity or alternative detectors provide separation and quantitation of anions and cations down to ppt levels. IC methods are adapted for faster flow rates, gradient eluents, concentrator/preparation columns, and detectors chosen to mitigate matrix effects.
• Workflow integration: Combining direct discrete measurements with IC (Disc-IC concept) enables a single, largely automated sequence to deliver routine parameters and trace ionic profiles from the same sample set.

Used instrumentation

• Thermo Scientific Gallery discrete analyzers: integrated photometric (Xenon lamp with configurable filter wheel) and electrochemistry module (ECM) for pH (range ~2–12) and conductivity (≈20 µS/cm–112 mS/cm), enabling parallel multi-parameter tests at high throughput (up to ~350 tests/hour) with microliter sample volumes.
• Thermo Scientific Dionex ion chromatography systems (including Reagent-Free IC, RFIC): IonPac column family (including fast, small-particle chemistries such as AS22-Fast and AS28-Fast, CS5A for cations), Dionex EGC cartridges for electrochemical eluent generation (reagent-free), and suppressed conductivity or UV-vis/electrochemical detectors as required by the analyte and matrix.
• Disc-IC integrated systems: combinations of discrete analyzer front-ends with IC for seamless, automated sample handling and analysis across both techniques.

Main results and discussion

• Throughput and sample economy: Discrete analyzers achieve very high sample throughput with small per-test sample consumption (microliters) and reduced waste compared with classical wet-chemistry assays that consume tens of milliliters per test.
• Parallel vs sequential testing: The Gallery platform performs multiple photometric assays in parallel (configurable up to ~20 photometric parameters) and automates routine electrochemical tests (pH, conductivity), reducing operator time and required training.
• IC speed and resolution: Small-particle IonPac columns permit higher flow rates (example: 0.3 to 0.5 mL/min) that shrink run times (near halving of run time in the provided example) while maintaining sharp, separable peaks for quantitation.
• Reagent-free eluent generation: Dionex EGC cartridges produce eluents from deionized water by electrolysis, improving safety, consistency, enabling gradients without additional proportioning pumps, and removing variability and contamination risks from manual eluent preparation.
• Trace-level detection and matrix handling: RFIC systems and optimized column sets enable ppb to ppt detection of corrosive anions and inhibitors. Concentrator columns and large-volume trapping/rinse steps allow trace analytes to be isolated from matrices containing high concentrations of interfering species (e.g., removing ppm–% boron/lithium backgrounds while resolving ppb-level target ions).
• Method optimization examples: Column selection and method tuning (e.g., elution order control to separate small amines from abundant ammonium, use of high-capacity columns to prevent overload, alternative detectors to bypass optical interferences) are crucial to detect low-level species in the presence of strong matrix signals.

Benefits and practical applications

• Operational efficiency: Automated discrete platforms reduce labor, training needs, and turnaround time for routine water-parameter monitoring (pH, conductivity, hardness, alkalinity, common anions/cations).
• Resource savings and sustainability: Microliter-scale assays reduce sample and reagent consumption and minimize hazardous waste generation compared with classical wet-chemistry techniques.
• Analytical depth: IC expands analytical reach to trace corrosive anions, corrosion inhibitors, transition metals, and other ions requiring separation and low-level detection, enabling proactive corrosion control and process protection.
• Flexibility: A combined analytical strategy (discrete + IC or Disc-IC) supports both high-throughput screening and targeted confirmatory analyses, improving process control, reducing downtime, and protecting expensive equipment.
• Online/continuous options: IC configurations can be adapted for continuous monitoring to provide rapid alerts for process excursions and facilitate real-time corrective actions.

Future trends and potential uses

• Greater integration and automation: Tighter coupling of screening and confirmatory instruments, automated sample prep, and walkaway solutions will reduce manual intervention and increase laboratory throughput.
• Reagent-free and greener chemistry: Electrolytic eluent generation and low-consumption assays will continue to lower environmental impact and improve analyst safety.
• Higher speed and sensitivity: Advances in column packing and detector technology will further reduce runtimes while preserving separation efficiency and pushing detection limits lower.
• Online analytics and digitalization: Broader deployment of continuous online IC monitoring, combined with cloud-based data handling and predictive analytics, will improve process control and maintenance planning.
• Method tailoring for complex matrices: Expanded use of concentrators, selective cleanup strategies, and orthogonal detection will allow robust analysis in increasingly challenging samples (e.g., high dissolved solids, organic-rich wastewaters).

Conclusion

An integrated analytical approach that combines automated discrete analyzers for routine multi-parameter screening with configurable ion chromatography for trace, speciation, and matrix-challenged determinations provides a comprehensive solution for process-water characterization. Discrete platforms deliver speed, simplicity, and low sample consumption for routine needs, while IC supplies the selectivity and sensitivity required for corrosion monitoring and difficult matrices. Together (or combined as Disc-IC systems), these technologies improve control of water-dependent industrial processes, reduce operational risk, and support more sustainable laboratory workflows.

Reference

• Source material: American Chemical Society / C&EN Media Group whitepaper describing Thermo Fisher Scientific Gallery discrete analyzers and Dionex ion chromatography systems (Thermo Fisher Scientific product examples and application data).