EPA Method 549.2 Instrumentation Guide

EPA Method 549.2 is a U.S. EPA-approved analytical procedure for the determination of diquat and paraquat—two widely used herbicides—in finished drinking water. This method employs high-performance liquid chromatography (HPLC) with ultraviolet (UV) detection, typically measured at 310 nm. These compounds pose potential health risks, making accurate detection essential for regulatory compliance and environmental monitoring. Laboratories conducting this method must implement HPLC systems that deliver precise flow control, stable baselines, and sensitive UV detection at the required wavelength.

A photo of AGILENT HPLC-VWD System for EPA Method 5493.2 that links to a catalog of Liquid Chromatography.

Instrumentation selected for Method 549.2 must be compatible with reversed-phase columns and capable of achieving the method’s detection limits for both target herbicides. Reliable systems should also support low dead volume, robust autosampler integration, and validated UV detection performance. Automated calibration, batch tracking, and secure software reporting tools enhance compliance with EPA quality control criteria. The systems listed below from Agilent, Shimadzu, Waters, Thermo Scientific, and PerkinElmer are all suitable for EPA 549.2 workflows and provide the analytical precision needed for herbicide analysis.

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Agilent 1260 Infinity HPLC System with VWD for EPA Method 549.2

The Agilent 1260 Infinity HPLC System with variable wavelength detector (VWD) delivers high-resolution separation and precise UV detection for EPA Method 549.2. Designed to support absorbance detection around 310 nm, the system offers excellent sensitivity for diquat and paraquat analysis. Its isocratic and gradient capabilities allow method flexibility across varied water matrices, while its pump system maintains reproducible flow rates with minimal noise.

Agilent’s OpenLab or ChemStation software automates calibration, data processing, and audit tracking. The 1260 Infinity is a proven system for compliance labs due to its stability and long-term performance. Its modular build supports upgrades like autosamplers and column heaters. The platform’s wide dynamic range and UV detection accuracy make it an ideal solution for water testing laboratories performing EPA 549.2.

Waters Alliance e2695 with 2489 UV Detector for EPA Method 549.2

The Waters Alliance e2695, paired with the 2489 UV/Visible detector, is built for high-precision herbicide analysis in water under EPA Method 549.2. The system supports robust UV detection near 310 nm for identifying diquat and paraquat with high reproducibility. Its quaternary pump supports flexible solvent programs for reversed-phase separations, enhancing method adaptability for different matrices.

Waters’ Empower software integrates sequence control, calibration monitoring, and result validation for complete compliance workflows. The e2695 offers high sample capacity and robust performance, making it a preferred system in contract testing and public utility labs. Its ability to maintain excellent baseline stability under high sample loads ensures long-term method consistency.

Shimadzu Prominence-i LC-2030C Plus for EPA Method 549.2

The Shimadzu LC-2030C Plus is a compact, integrated HPLC system featuring a built-in UV detector optimized for diquat and paraquat analysis under Method 549.2. With excellent retention time stability and precise detection at 310 nm, it supports routine herbicide monitoring in compliance with EPA standards. Its low maintenance and energy-efficient design make it especially valuable for high-throughput water labs.

LabSolutions software simplifies method programming, sample tracking, and QA/QC reporting. The system features an autosampler for increased efficiency and reduced variability. In addition, it enables secure storage of validated methods, ensuring repeatable performance in regulated environments. With its robust optics and intuitive controls, the LC-2030C Plus is well-suited for labs conducting daily EPA Method 549.2 testing.

Thermo Scientific UltiMate 3000 HPLC with VWD-3100 for EPA Method 549.2

The Thermo Scientific UltiMate 3000 HPLC system with the VWD-3100 detector provides UV absorbance monitoring tailored for EPA 549.2 requirements. With wavelength flexibility covering the 310 nm range, the system accurately detects diquat and paraquat at regulatory limits. Its precise isocratic control and high reproducibility make it suitable for long-term water quality monitoring.

Chromeleon CDS software enhances user productivity by automating regulatory compliance checks, batch processing, and documentation. The UltiMate 3000’s compact design and robust autosampler streamline daily operation, even in high-volume settings. Its modularity also supports future method extensions. This HPLC system is ideal for laboratories conducting EPA-compliant herbicide testing with an emphasis on speed, precision, and efficiency.

PerkinElmer Series 200 HPLC with UV Detector for EPA Method 549.2

The PerkinElmer Series 200 HPLC with UV detector offers a dependable, cost-effective option for EPA Method 549.2 herbicide analysis. With reliable operation at 310 nm, this system supports accurate detection of diquat and paraquat in water samples. Its precision flow control and stable photometric response deliver consistent peak shape and repeatability across routine analyses.

The system integrates seamlessly with PerkinElmer’s TotalChrom software for automated batch processing and quality assurance documentation. Although more traditional in design, the Series 200 remains a trusted platform for labs needing regulatory compliance without extensive automation. Its durable hardware and simple controls make it especially practical for smaller labs with standard throughput needs.

Choosing the Right HPLC System for EPA Method 549.2

  • For high-throughput analysis: Waters e2695 and Shimadzu LC-2030C Plus offer robust automation and consistent baseline performance for regulated herbicide testing.
  • For flexible method support: Agilent 1260 Infinity and Thermo UltiMate 3000 systems provide customizable configurations and dependable UV detection near 310 nm.
  • For cost-effective compliance: The PerkinElmer Series 200 delivers reliable herbicide quantification in a compact, budget-friendly footprint.

EPA Method 549.2 is designed for the determination of diquat and paraquat in drinking water using HPLC with UV detection, typically around 310 nm. Each of the instruments listed above supports this analytical requirement and ensures regulatory compliance with precision. Whether you prioritize automation, flexibility, or affordability, these systems provide validated platforms for reliable herbicide monitoring. Contact us today to explore certified refurbished HPLC systems optimized for EPA Method 549.2.