US EPA Method 200.7 using the Thermo Scientific iCAP PRO XPS Duo ICP-OES

Význam tématu

Continuous control of metal contaminants in natural and drinking waters is vital for protecting public health and meeting stringent regulatory standards such as US EPA’s Maximum Contaminant Levels.

Cíle a přehled studie

This study evaluates the Thermo Scientific iCAP PRO XPS Duo ICP-OES performance according to US EPA Method 200.7 for the determination of 31 elements in various water matrices. Key objectives include demonstrating compliance with detection limits, linear dynamic range, and quality control requirements.

Použitá metodika a instrumentace

• Method: US EPA Method 200.7 for metals and trace elements by ICP-OES.
• Instrument: Thermo Scientific iCAP PRO XPS Duo ICP-OES with axial and radial plasma views.
• Autosampler: Teledyne CETAC ASX-560.
• Internal standard: Online addition of 5 mg·L⁻¹ yttrium.
• Sample preparation: Acidification with 1.5% TraceMetal grade HNO₃, calibration and QC solutions prepared from 1000 mg·L⁻¹ standards.

Hlavní výsledky a diskuse

The instrument achieved sub-µg·L⁻¹ detection limits for most analytes, satisfying regulatory requirements. The linear dynamic range extended beyond typical contaminant levels, minimizing sample dilution. Interference studies identified few spectral overlaps, effectively corrected by automated inter-element correction. Quality control checks (QCS, IPC, LFM) yielded recoveries within defined limits and relative standard deviations below 5%, demonstrating excellent accuracy, precision and stability over extended sample runs.

Přínosy a praktické využití metody

• Robust compliance with EPA drinking water regulations.
• High throughput: ~30 samples per hour with fast start-up and autosampler efficiency.
• Wide dynamic range reduces reruns and dilutions.
• Automated QC in Qtegra ISDS Software ensures data reliability.

Budoucí trendy a možnosti využití

• Enhanced UV (eUV) technology for further improved detection limits in the UV region.
• Integration with discrete sampling valves for faster uptake times.
• Expansion of method scope to emerging contaminants and speciation studies.
• Coupling with advanced data analytics and remote monitoring workflows.

Závěr

The Thermo Scientific iCAP PRO XPS Duo ICP-OES meets US EPA Method 200.7 requirements for trace and major element analysis in drinking, ground, and waste waters, combining sensitive detection, broad dynamic range, and rigorous quality control for reliable, high-throughput environmental monitoring.

Reference

• US EPA. Method 200.7: Determination of Metals and Trace Elements in Water and Wastes by ICP-OES.
• Thermo Fisher Scientific. Application Note 44422: US EPA Method 200.7 using the iCAP PRO XPS Duo ICP-OES, 2019.