ORP Standard Solution (222 mV), SANXIN Peirui

Overview

The SANXIN Peirui 222 mV ORP Standard Solution is a rigorously formulated redox calibration reference material designed for accurate verification and routine calibration of oxidation-reduction potential (ORP) electrodes and meters. Engineered for metrological traceability and long-term stability, this solution adheres to internationally recognized electrochemical calibration principles based on the reversible quinhydrone/hydroquinone redox couple in buffered acidic medium. It provides a stable, reproducible potential of +222 mV ± 5 mV vs. Standard Hydrogen Electrode (SHE) at 25 °C, enabling laboratories to validate electrode response linearity, assess drift, and confirm system readiness prior to critical sample measurements. Its formulation complies with fundamental requirements outlined in ASTM D1129 and ISO 10523 for pH and redox reference solutions, supporting method validation under GLP and ISO/IEC 17025 frameworks.

Key Features

• Precisely formulated to deliver a certified redox potential of +222 mV ± 5 mV vs. SHE at 25 °C — traceable to NIST-traceable reference standards via manufacturer’s internal calibration protocol
• Stabilized aqueous matrix containing quinhydrone and saturated hydroquinone in pH 4.00 phosphate buffer, minimizing oxygen sensitivity and thermal hysteresis
• Available in two sterile-filtered, air-tight HDPE bottle formats: 50 mL (for high-frequency lab use) and 250 mL (for centralized calibration stations or multi-instrument facilities)
• Batch-certified with individual CoA (Certificate of Analysis) including measured potential, pH, expiration date, and storage conditions
• No mercury or heavy-metal additives — fully compliant with RoHS directives and modern environmental safety protocols for laboratory waste disposal

Sample Compatibility & Compliance

This ORP standard is compatible with all conventional platinum or gold ORP electrodes, combination ORP/pH probes, and benchtop or portable ORP meters from major manufacturers including Metrohm, Thermo Fisher Scientific, Hach, Hanna Instruments, and Horiba. It is not intended for direct use with non-aqueous, highly viscous, or strongly oxidizing samples. The solution meets baseline suitability criteria defined in USP , EPA Method 9040C, and ISO 5667-18 for redox reference materials used in water quality testing, pharmaceutical process monitoring, and wastewater treatment control. Each batch undergoes accelerated stability testing per ICH Q1A(R2) guidelines, with a shelf life of 12 months unopened when stored at 15–25 °C away from direct sunlight.

Software & Data Management

While the solution itself is a physical reference material, its use integrates seamlessly into digital quality management workflows. Laboratories employing LIMS (e.g., LabWare, STARLIMS) or ELN platforms (e.g., Benchling, LabArchives) can log calibration events using the unique batch number printed on each bottle label. The CoA includes QR-coded access to downloadable PDF documentation, enabling automated audit trail generation. For instruments with built-in calibration logging (e.g., Metrohm OMNIS, Thermo Orion Star Series), the 222 mV value may be entered as a user-defined standard — supporting 21 CFR Part 11-compliant electronic records when paired with appropriate instrument firmware and access controls.

Applications

• Initial commissioning and periodic verification of ORP sensors in potable water distribution systems and drinking water treatment plants
• Calibration validation for redox-controlled bioreactors in biopharmaceutical upstream processing
• Quality control of disinfection efficacy monitoring (e.g., chlorine, ozone, chlorine dioxide) in municipal and industrial effluent streams
• Supporting ASTM D3370 and ISO 5814 compliance in dissolved oxygen measurement uncertainty budgets where ORP serves as an ancillary indicator
• Teaching laboratories requiring robust, repeatable redox reference points for undergraduate electrochemistry experiments

FAQ

What is the shelf life of the 222 mV ORP standard solution after opening?
Once opened, the solution remains valid for up to 30 days if stored at 15–25 °C in its original container with cap tightly sealed and protected from light and atmospheric CO₂ ingress.
Can this solution be used to calibrate ORP electrodes at temperatures other than 25 °C?
Yes — temperature compensation must be applied using the electrode’s built-in ATC or manual correction factor; the certified value of +222 mV is referenced strictly to 25 °C, and the solution’s temperature coefficient is approximately −0.8 mV/°C.
Is this product suitable for FDA-regulated GMP environments?
Yes — supplied with full batch traceability, CoA, and documented manufacturing controls aligned with ISO 13485 principles; supports GMP calibration record retention when used within validated procedures.
Why does the solution appear slightly yellowish?
The faint amber hue arises from the natural color of the quinhydrone redox couple and is indicative of proper formulation integrity; discoloration to brown or precipitate formation signals degradation and warrants replacement.