Shenchanghong CHCN-121 Cyanide Analyzer
| Brand | Shenchanghong |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Regional Classification | Domestic (China) |
| Model | CHCN-121 |
| Instrument Type | Benchtop Laboratory Analyzer |
| Measurement Range | 0.01–0.50 mg/L |
| Accuracy | ≤±5% FS |
| Repeatability | ≤3% RSD |
| Optical Drift | <0.002 A in 20 min |
| Dimensions (H×W×D) | 130 mm × 266 mm × 200 mm |
| Weight | <1.0 kg |
| Operating Environment | 5–40 °C, RH ≤85%, AC 220 V ±10%, 50 Hz ±0.5 Hz, Low EMI/Vibration, No Direct Sunlight |
Overview
The Shenchanghong CHCN-121 Cyanide Analyzer is a benchtop photometric analyzer engineered for the quantitative determination of free and total cyanide in aqueous environmental samples. It operates on the principle of spectrophotometric detection following colorimetric derivatization—specifically, the pyridine-barbituric acid method (or ISO 6703-2 compliant variant), wherein cyanide ions react under controlled acidic distillation to form a chromophore with characteristic absorbance at 578 nm. The instrument integrates a cold-light LED source and narrow-band optical filtering to ensure high photometric stability and minimal spectral interference. Designed for routine compliance testing in municipal water laboratories, wastewater treatment facilities, and environmental monitoring agencies, the CHCN-121 delivers trace-level cyanide quantification across drinking water, surface water, domestic wastewater, and distilled effluent matrices—fully aligned with national regulatory requirements for cyanide reporting in China (e.g., HJ 484–2009) and technically compatible with international frameworks including ISO 11292 and ASTM D7511.
Key Features
- Stable cold-light LED source with single-wavelength (578 nm) optical path, eliminating thermal drift and ambient light interference.
- Integrated microprocessor-controlled photometry with V/F conversion circuitry and software-based noise suppression algorithms for enhanced signal integrity.
- Large backlit LCD display with full Chinese menu interface—enabling unified operation for calibration, measurement, curve management, and data review.
- Non-volatile memory storage supporting up to 10 user-defined calibration curves and 99 measurement records; all retained during power loss.
- Durable ABS polymer housing with chemical-resistant surface finish, optimized for long-term use in humid or reagent-exposed lab environments.
- Compact footprint (266 × 200 × 130 mm) and sub-kilogram mass (<1.0 kg), facilitating deployment in space-constrained QC labs or mobile field laboratories with stable AC supply.
Sample Compatibility & Compliance
The CHCN-121 is validated for use with pre-treated liquid samples meeting standard cyanide preservation and distillation protocols. It accepts samples prepared according to HJ 484–2009 (China) or ISO 6703-2 (distillation followed by colorimetric detection). Sample types include potable water, groundwater, river/lake surface water, treated and raw wastewater, and distilled industrial effluents. While not certified to GLP or ISO/IEC 17025 out-of-the-box, the analyzer supports traceable calibration via NIST-traceable cyanide standards and enables audit-ready documentation when paired with external lab notebooks or LIMS integration. Its optical stability (<0.002 A drift over 20 min) and repeatability (≤3% RSD) meet minimum performance criteria specified in EPA Method 335.4 for laboratory-grade cyanide analysis.
Software & Data Management
The embedded firmware provides complete local control without PC dependency. Calibration is performed using up to six standard points; the system automatically fits linear or polynomial regression models and displays correlation coefficients (r²). All calibration parameters—including slope, intercept, and date/time stamps—are stored with each curve. Measurement history includes sample ID, concentration, date/time, operator ID (manual entry), and associated calibration curve ID. Data export is not supported via USB or Bluetooth; however, users may manually transcribe results or integrate into broader QA workflows using standardized reporting templates. Firmware supports password-protected parameter modification and includes built-in self-diagnostics for lamp intensity, detector response, and power supply voltage monitoring.
Applications
- Routine monitoring of cyanide in drinking water distribution systems per GB 5749–2022 limits (0.05 mg/L).
- Compliance verification for industrial discharge permits under China’s Integrated Wastewater Discharge Standard (GB 8978–1996).
- Environmental impact assessment (EIA) sampling in mining-adjacent watersheds where cyanide leaching is a concern.
- Quality control in electroplating, metal finishing, and gold extraction facilities requiring daily effluent screening.
- Educational use in university environmental chemistry labs for method validation and student-led water quality projects.
FAQ
What sample pretreatment is required prior to analysis?
Distillation under acidic conditions (pH 12) must occur immediately after collection.
Does the CHCN-121 comply with US EPA or EU regulatory methods?
It implements methodology equivalent to ISO 6703-2 and HJ 484–2009. While not EPA-recognized as a listed method, its photometric performance meets sensitivity and precision thresholds defined in EPA Method 335.4 for laboratory use.
Can calibration curves be imported from external instruments?
No—calibration must be performed in situ using certified cyanide standards. Curve parameters are not transferable between units.
Is the instrument suitable for field deployment?
It is designed for stable AC-powered benchtop use. Battery operation is not supported; portable deployment requires an external inverter and climate-controlled transport.
How often should optical alignment or lamp replacement be performed?
The LED light source has a rated lifetime exceeding 10,000 hours. No user-serviceable optical alignment is provided; periodic verification with blank and mid-range standard is recommended every 30 days or per internal QA schedule.
