HunterLab Platinum-Cobalt (Pt-Co/Hazen/APHA) Standard Solution, 10 APHA Units
| Brand | HunterLab |
|---|---|
| Origin | USA |
| Model | 10 APHA |
| Volume | 500 mL |
| Optical Structure | 8°/diffuse |
| Light Source | Full-spectrum balanced solid-state LED system |
| Spectral Range | 400–700 nm |
| Repeatability | ΔE* ≤ 0.03 |
| Compliance | ASTM D1209, ISO 6271, USP <631>, GB/T 605-2006, GB 3143 |
Overview
The HunterLab Platinum-Cobalt (Pt-Co/Hazen/APHA) Standard Solution, 10 APHA Units is a traceable, chemically stable liquid reference material engineered for daily performance verification of color measurement instruments used in water quality analysis, pharmaceutical manufacturing, chemical R&D, and industrial process control. Based on the classical Pt-Co colorimetric principle—defined as the hue produced by 1 mg/L potassium chloroplatinate (K₂PtCl₆) and 0.5 mg/L cobalt(II) chloride (CoCl₂·6H₂O)—this standard provides a rigorously calibrated visual and instrumental benchmark corresponding to 10 degrees on the APHA (American Public Health Association) scale. It operates within the visible spectrum (400–700 nm), aligning with the spectral response of modern spectrophotometers and tristimulus colorimeters equipped with 8°/diffuse optical geometry. Unlike empirical visual comparisons, this certified standard enables quantitative instrument qualification under controlled lighting and geometric conditions, supporting method validation per ASTM D1209 and regulatory alignment with USP and ISO 6271.
Key Features
- Traceable calibration: Certified against NIST-traceable reference materials; documented uncertainty budget available upon request
- Chemical stability: Formulated using high-purity reagents and stabilized matrix to minimize degradation over time when stored properly
- Consistent optical path: Supplied in 500 mL amber glass or UV-stabilized HDPE bottles with tight-sealing caps to prevent evaporation and photolytic decomposition
- Instrument-agnostic compatibility: Validated for use with benchtop spectrophotometers, portable colorimeters, and automated inline sensors utilizing 8°/diffuse illumination geometry
- Low repeatability drift: Meets ΔE* ≤ 0.03 (CIE L*a*b*, 10° observer, D65 illuminant) across repeated measurements on calibrated instrumentation
- Regulatory-ready documentation: Includes Certificate of Conformance with lot-specific preparation date, expiration date, and storage recommendations
Sample Compatibility & Compliance
This 10 APHA standard is designed for routine verification of instruments measuring yellowness index, APHA/Pt-Co color, and related chromaticity parameters in clear, low-turbidity liquids—including purified water, solvents, pharmaceutical excipients, and process streams in fine chemical synthesis. It complies with multiple international standards governing color measurement methodology and quality assurance: ASTM D1209 (Standard Test Method for Color of Clear Liquids), ISO 6271 (Plastics — Determination of color of thermoplastics), USP (Color), and Chinese national standards GB/T 605-2006 and GB 3143. Its formulation adheres to GLP-aligned handling protocols; users are advised to store unopened vials at 15–25°C in darkness, avoid freezing, and discard after opening if not used within 30 days under cleanroom-grade handling conditions.
Software & Data Management
When integrated into instrument qualification workflows, the 10 APHA standard supports audit-ready data capture through HunterLab’s EasyMatch QC software or third-party platforms compliant with FDA 21 CFR Part 11. The software logs measurement timestamps, operator IDs, instrument serial numbers, and deviation metrics relative to certified target values—enabling automated pass/fail assessment and generation of IQ/OQ reports. All raw spectral data (31-point reflectance/transmittance scans from 400–700 nm) are exportable in CSV or XML format for trend analysis, statistical process control (SPC), and integration into LIMS environments. Instrument calibration verification events may be scheduled automatically and linked to preventive maintenance calendars.
Applications
- Pharmaceutical water systems: Daily verification of WFI (Water for Injection) and Purified Water color compliance per USP
- Chemical manufacturing: Monitoring color stability of intermediates and final products during synthesis and purification
- Paper & pulp industry: Ensuring process water meets ≤15 APHA limits for bleaching and coating operations
- Textile dyeing: Qualifying rinse water clarity prior to fabric immersion to prevent staining artifacts
- Academic research labs: Teaching standardized colorimetry principles and validating student-grade instrumentation
- Environmental testing labs: Supporting EPA-compliant wastewater discharge reporting where APHA color is a regulated parameter
FAQ
What is the shelf life of an unopened 10 APHA standard?
Unopened vials retain certified performance for 24 months from date of manufacture when stored at 15–25°C in darkness.
Can this standard be used for instrument calibration, or only verification?
It is intended for performance verification (qualification), not primary calibration; it does not replace factory calibration or NIST-traceable calibration standards.
Is the solution compatible with cuvettes made of quartz, glass, or plastic?
Yes—validated for use with standard 10 mm pathlength cuvettes of fused silica, borosilicate glass, or optical-grade polystyrene; avoid polycarbonate due to potential UV absorption.
How frequently should I verify my instrument using this standard?
Daily verification is recommended for regulated environments; minimum frequency is per analytical batch or shift, aligned with internal SOPs and ISO/IEC 17025 requirements.
Does HunterLab provide a full APHA standard set (e.g., 5–500 APHA)?
Yes—custom multi-level EasyCert APHA Verification Kits are available, including 5, 10, 20, 30, 50, 100, 200, and 500 APHA units, each with individual CoA and traceability documentation.
