Puritek Cyanide Analyzer 3700
| Brand | OI Analytical |
|---|---|
| Origin | USA |
| Model | 3700 |
| Instrument Type | Laboratory Benchtop Analyzer |
| Detection Principle | Amperometric Detection after Acid Distillation-Free Digestion |
| Detection Range | 2 ppb – 10 ppm CN⁻ |
| Detection Limit | 0.002 ppm (2 ppb) |
| Sample Throughput | 1 sample per 2 minutes for Total Cyanide |
| Compliance | ASTM D7282, EPA Method 335.4, ISO 11262, GB/T 5750.5–2023 |
| Reagent Preparation Time | <10 minutes |
| System Architecture | Fully Automated, Closed-Loop Reaction Channels |
Overview
The Puritek Cyanide Analyzer 3700 is a fully automated, benchtop laboratory instrument engineered for precise, high-throughput determination of total and free cyanide in aqueous environmental and industrial samples. Unlike conventional distillation-based methods, the 3700 implements an acid digestion protocol that eliminates the need for time-consuming and hazardous distillation steps—significantly reducing operator exposure, method variability, and turnaround time. The system operates on amperometric detection principles: following controlled acidification and UV-assisted oxidation (where applicable), liberated cyanide ions are selectively oxidized at a gold working electrode under optimized potential, generating a current proportional to cyanide concentration. This electrochemical transduction mechanism delivers inherent selectivity against common interferences such as sulfide, thiocyanate, and nitrite—provided appropriate masking agents and method-specific pretreatment protocols are applied per EPA 335.4 or ISO 11262.
Key Features
- Fully automated sample handling with programmable aspiration, reagent addition, reaction timing, and detection—no manual intervention required after method initialization.
- Dedicated, isolated reaction channels prevent cross-contamination between samples and ensure method reproducibility across batch runs.
- Distillation-free digestion module enables direct analysis of total cyanide in wastewater, surface water, leachates, and process effluents without prior distillate collection.
- Amperometric detector with solid-state gold electrode—zero consumables, no lamp replacement, and no optical alignment; maintenance limited to routine electrode polishing and calibration verification.
- Onboard reagent management with integrated level sensors and temperature-controlled reagent storage (4–25 °C) to preserve reagent stability over extended operation cycles.
- Compliance-ready architecture supporting audit trails, electronic signatures, and method version control—designed to meet GLP and GMP documentation requirements.
Sample Compatibility & Compliance
The 3700 accepts liquid samples with suspended solids ≤50 mg/L (pre-filtered via 0.45 µm membrane); turbid or high-sulfide matrices require optional sulfide removal pretreatment per EPA 335.4 Annex A. It is validated for use with drinking water, groundwater, industrial wastewater, electroplating rinse solutions, mining leachates, and pharmaceutical process streams. All default methods embedded in the firmware are traceable to U.S. EPA Method 335.4 (amperometric endpoint), ASTM D7282 (total cyanide by ligand exchange–amperometry), ISO 11262 (soil leachates), and China’s GB/T 5750.5–2023. Instrument qualification includes IQ/OQ documentation packages aligned with FDA 21 CFR Part 11 expectations for electronic records and signatures.
Software & Data Management
Controlled via Puritek AnalyzeSuite™ v4.x—a Windows-based application supporting method development, sequence scheduling, real-time sensor monitoring, and automatic report generation in PDF/CSV formats. The software enforces role-based access control (administrator, analyst, reviewer), maintains full audit trails of all method edits, calibration events, and result overrides, and logs timestamps with millisecond precision. Data integrity safeguards include checksum-verified raw signal files, encrypted database backups, and configurable auto-archive to network drives or LIMS via ASTM E1384-compliant export templates. Optional 21 CFR Part 11 compliance package adds digital signature workflows and electronic record retention policies.
Applications
- Environmental laboratories performing regulatory compliance testing for NPDES permits and RCRA waste characterization.
- Pharmaceutical and biologics manufacturers monitoring cyanide residuals in active pharmaceutical ingredient (API) synthesis streams and vaccine adjuvant preparation baths.
- Electroplating and metal finishing facilities conducting daily effluent screening per local discharge limits.
- Research institutions studying cyanide speciation kinetics in soil-water systems using method-modified sequences.
- Public health labs verifying cyanide levels in potable water sources following accidental releases or industrial incidents.
FAQ
Does the 3700 differentiate between free and total cyanide?
Yes—free cyanide is measured directly in unacidified samples; total cyanide requires onboard acid digestion with UV irradiation (optional module) per EPA 335.4.
Can the system interface with our existing LIMS?
Yes—via ASTM E1384-compliant ASCII or HL7 message export; custom API integration is supported through Puritek’s Developer Toolkit.
What is the typical calibration frequency?
Initial calibration is performed with NIST-traceable K₄[Fe(CN)₆] standards; drift verification is recommended every 8 hours or 20 samples, whichever occurs first.
Is operator training included with purchase?
Yes—standard delivery includes two-day on-site installation, validation support, and hands-on operation training for up to three analysts.
How is method validation documented?
Each shipment includes a Factory Acceptance Test (FAT) report, and users receive IQ/OQ templates compliant with ISO/IEC 17025 and USP analytical instrument qualification guidelines.
