AQUATek LVA Liquid Vial Autosampler

Importance of the Topic

The analysis of volatile organic compounds (VOCs) in water matrices is critical for environmental monitoring, regulatory compliance, and public health protection. Automated purge and trap sampling reduces manual handling errors, limits analyte loss, and enhances laboratory throughput, making it indispensable for routine water quality and industrial process control.

Study Goals and Overview

This application note introduces the AQUATek LVA Liquid Vial Autosampler, designed to fully automate the sample preparation steps for aqueous VOC analysis by purge and trap. The document outlines system capabilities, compliance with USEPA methods, and applicability across multiple industries including environmental, food, pharmaceutical, and petrochemical sectors.

Methodology and Used Instrumentation

The automated workflow involves pressurization of a fixed-volume PEEK sample loop (5–25 mL), addition of internal or surrogate standards, transfer to a concentrator (Lumin or Stratum PTC), followed by a two-stage 90 °C water rinse of the loop and sparger. Key hardware components include:

• XYZ robotic arm with septum‐piercing needle for 84-position vial handling and vial chilling to 4 °C.
• Fixed-volume PEEK sample loop and two 3-port solenoid valves for sample delivery and cleaning.
• On-board hot water heater (35–90 °C) for high-temperature rinsing.
• Optional pH probe for in-situ pH measurement.
• Dual standard injection system with two 15 mL amber vessels, delivering 1–20 µL of standards.
• Lumin TekLink™ software for method scheduling, diagnostics (leak and benchmark tests), and status monitoring.

Main Results and Discussion

The AQUATek LVA demonstrates high precision (<1% RSD for 5 mL delivery) and accurate standard additions (<10% RSD for 5 µL injections). The closed-system sampling and vial chiller preserve sample integrity, reducing VOC losses. The integrated cleaning cycle and blank water reservoir permit continuous operation with minimal carryover, streamlining compliance with multiple USEPA, ASTM, and state methods.

Benefits and Practical Applications

• Enhanced laboratory productivity through full automation and rapid scheduling.
• Reliable compliance with environmental regulations (USEPA Methods 502.1–8260, ASTM, Standard Methods).
• Broad applicability to drinking water, wastewater, and industrial samples with up to 15 mm sediment content.
• Scalable footprint via stackable configuration, saving bench space.

Future Trends and Applications

Emerging trends include further integration with laboratory information management systems (LIMS), advanced sensor modules for real-time sample characterization, and expanded method libraries for non-aqueous matrices. Continued miniaturization and remote monitoring capabilities will drive wider adoption in field deployable systems.

Conclusion

The AQUATek LVA autosampler provides an efficient, compliant, and robust solution for aqueous VOC analysis by purge and trap. Its combination of precision sampling, automated cleaning, and intuitive software enhances data quality while reducing labor costs.

References

• No external literature cited.