Varian 720-ES ICP-OES Inductively Coupled Plasma Optical Emission Spectrometer

Overview

The Varian 720-ES ICP-OES is a high-performance, full-spectrum simultaneous elemental analyzer engineered for precision multi-element quantification in environmental, geological, clinical, and industrial laboratories. Based on inductively coupled plasma optical emission spectroscopy (ICP-OES), the system atomizes and excites sample aerosols in a 10,000 K argon plasma, enabling detection of over 70 elements at trace to major concentration levels. Its core innovation lies in the sealed, thermoelectrically cooled VistaChip II CCD detector — a second-generation charge-coupled device optimized for quantum efficiency across the 167–785 nm spectral range. Unlike sequential or polychromator-based systems, the 720-ES acquires the entire emission spectrum simultaneously, eliminating wavelength scanning delays and ensuring intrinsically stable relative intensity ratios critical for internal standardization and matrix-matched calibration.

Key Features

• Full-spectrum simultaneous acquisition via VistaChip II CCD detector with 1024 × 256 pixel array and <0.005 nm spectral resolution (FWHM at 200 nm)
• Dual-view plasma observation: user-selectable axial or radial configuration for optimized sensitivity (axial) or reduced matrix interference (radial)
• Robust RF generator with 27.12 MHz solid-state design and automatic impedance matching for plasma stability under variable sample load conditions
• Integrated nebulizer gas flow control and peristaltic pump with pulse-free delivery for high reproducibility (RSD < 0.5% for 10 replicate injections)
• Modular optical bench with fused silica optics and hermetically sealed spectrometer housing to minimize thermal drift and moisture-induced wavelength shift
• Lytron recirculating chiller integrated into the plasma torch cooling loop, maintaining ±0.1 °C temperature stability during extended operation

Sample Compatibility & Compliance

The 720-ES accommodates aqueous solutions, digested solids (e.g., EPA SW-846 Method 3050B/3052), organic solvents (with oxygen addition), and slurry suspensions (with ultrasonic nebulization option). It supports standard sample introduction configurations including glass concentric nebulizers, cyclonic spray chambers, and the optional SPS-3 autosampler with 60-position rack capacity and programmable rinse cycles. The instrument architecture complies with key regulatory frameworks: data integrity features in ICP Expert II software support audit trails, electronic signatures, and 21 CFR Part 11 compliance when deployed in GLP/GMP environments. Analytical protocols align with ASTM D1976 (water analysis), ISO 11885 (wastewater metals), USP / (elemental impurities in pharmaceuticals), and EPA Methods 200.7 (freshwater), 200.8 (wastewater), and 6010D (soil/sediment).

Software & Data Management

ICP Expert II provides a validated, Windows-based platform for method development, calibration, QC monitoring, and report generation. It includes built-in spectral interference correction algorithms (e.g., peak deconvolution, background subtraction using adjacent pixels), automated line selection based on signal-to-background ratio, and dynamic linear range extension via multi-concentration calibration. All acquisitions are timestamped and stored with full metadata (plasma power, nebulizer flow, integration time, detector temperature). Raw spectral files (.spc) and processed results (.csv/.pdf) are exportable; audit trail logs record user actions, parameter changes, and calibration events — essential for laboratory accreditation (ISO/IEC 17025) and regulatory inspections.

Applications

• Environmental testing: quantification of regulated metals (As, Cd, Cr, Pb, Hg, Ni, Zn) in drinking water, wastewater, soil extracts, and air particulates
• Geochemical analysis: major oxide (SiO₂, Al₂O₃, Fe₂O₃) and trace element (REE, U, Th) profiling in rock digests and mineral concentrates
• Pharmaceutical quality control: residual catalyst screening (Pd, Pt, Rh) and elemental impurity verification per ICH Q3D guidelines
• Metallurgical process control: alloy composition verification (Al, Cu, Mg, Mn, Si, Zn) and slag analysis
• Food safety: monitoring of toxic elements (As, Cd, Pb) in infant formula, cereals, and seafood matrices

FAQ

Is this unit fully refurbished and performance-verified?
Yes — each 720-ES undergoes comprehensive functional testing at SpectraLab Scientific’s certified facility, including plasma ignition stability, wavelength calibration accuracy (NIST-traceable Hg/Ar lamp), detector dark current measurement, and multi-element recovery validation using CRM standards.
What documentation accompanies the instrument?
Shipment includes original Varian hardware manuals, ICP Expert II software installation media and license key, factory service records (where available), and a Certificate of Operational Verification signed by our applications engineer.
Can the system be configured for regulated environments?
Yes — optional 21 CFR Part 11-compliant software modules, electronic signature workflows, and IQ/OQ documentation packages are available upon request.
Is remote support and application assistance provided post-purchase?
All units include 6 months of technical support via email and screen-sharing sessions with our ICP-OES applications specialists, covering method transfer, troubleshooting, and routine maintenance guidance.
Are spare parts and consumables available?
We maintain inventory of critical spares including VistaChip II detector assemblies, torches, nebulizers, spray chambers, and RF coils — all sourced from authorized Varian/Agilent channels or OEM-equivalent suppliers meeting ASTM E2915 specifications.