Shenchanghong CHNI-120 Benchtop Nickel Analyzer
| Brand | Shenchanghong |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Origin Category | Domestic (China) |
| Model | CHNI-120 |
| Instrument Type | Benchtop Laboratory Analyzer |
| Detection Principle | Photometric Method (Visible Spectrophotometry at 530 nm) |
| Target Analyte | Nickel (Ni²⁺) |
| Measurement Range | 0.02–1.00 mg/L |
| Accuracy | ≤ ±5% FS |
| Repeatability | ≤ 3% RSD |
| Optical Drift | < 0.002 A in 20 min |
| Resolution | 0.01 mg/L |
| Dimensions (W×D×H) | 266 × 200 × 130 mm |
| Weight | < 1.0 kg |
| Operating Temperature | 5–40 °C |
| Relative Humidity | ≤ 85% RH |
| Power Supply | AC 220 V ± 10%, 50 Hz |
| Light Source | High-stability imported LED cold light source with narrow-band interference filter (center wavelength: 530 nm) |
| Optical System | Fixed-path cuvette-based photometric architecture |
| Data Storage | Internal memory for calibration curves and measurement records |
| Compliance | Designed to support ISO 7027, ASTM D1688, and GB/T 5750.6–2023 (Chinese Standard for Ni in Drinking Water) |
Overview
The Shenchanghong CHNI-120 Benchtop Nickel Analyzer is a dedicated photometric instrument engineered for accurate, repeatable quantification of dissolved nickel (Ni²⁺) in aqueous environmental samples. It operates on the principle of visible spectrophotometry—specifically, the formation of a stable pink-colored complex between nickel ions and dimethylglyoxime (DMG) under controlled alkaline conditions, with absorbance measured at 530 nm. This method conforms to internationally recognized wet-chemistry protocols referenced in ISO 7027 (turbidity and colorimetric methods), ASTM D1688 (nickel in water by DMG spectrophotometry), and the Chinese national standard GB/T 5750.6–2023 for drinking water quality analysis. The CHNI-120 integrates a high-stability, long-life imported LED cold light source and a precision narrow-band interference filter to minimize spectral stray light and thermal drift, ensuring robust baseline stability over extended operation. Its fixed optical path design eliminates alignment variability common in modular spectrophotometers, contributing directly to measurement reproducibility (<3% RSD) and long-term accuracy (≤±5% FS across the 0.02–1.00 mg/L range).
Key Features
- High-stability photometric architecture with imported LED cold light source and 530 nm narrow-band interference filter—optimized for Ni-DMG complex detection
- Microprocessor-controlled data acquisition and real-time calculation; direct display of Ni concentration (mg/L) on large-character LCD screen
- Dual calibration capability: pre-loaded factory calibration curve plus user-definable calibration points (up to 10-point custom curve)
- Onboard data storage for up to 500 measurement records and ≥3 user-defined calibration curves
- Durable ABS polymer housing with chemical-resistant surface finish—designed for routine lab use in water quality testing environments
- Low-power 16-bit embedded microcontroller system enabling stable operation and minimal thermal load during continuous analysis
- Compact benchtop footprint (266 × 200 × 130 mm) and lightweight construction (<1.0 kg) for flexible placement in QC labs, field stations, or mobile monitoring units
Sample Compatibility & Compliance
The CHNI-120 is validated for use with clarified, non-turbid aqueous matrices including potable water, surface water, groundwater, municipal wastewater effluent, and industrial process water. Sample pretreatment—such as filtration (0.45 µm membrane), pH adjustment, and masking of interfering ions (e.g., Fe³⁺, Co²⁺) using citrate or EDTA—is performed manually per standard method protocol prior to analysis. While the instrument itself does not perform digestion, it is compatible with acid-digestion workflows (EPA Method 200.7 or ISO 11885) when coupled with appropriate sample preparation equipment. The analyzer supports GLP-aligned documentation practices through timestamped internal data logging and user-accessible calibration history. Though not FDA 21 CFR Part 11-certified out-of-the-box, its audit-trail-capable firmware architecture allows integration into regulated laboratories via documented SOPs and external electronic lab notebook (ELN) systems.
Software & Data Management
The CHNI-120 operates autonomously without PC dependency. All calibration, measurement, and data recall functions are executed via intuitive Chinese-language menu navigation on the integrated LCD interface. Calibration curves are stored in non-volatile memory and retain settings after power cycling. Measurement results include sample ID (user-entered alphanumeric tag), date/time stamp, concentration value, and associated calibration curve ID. Data export is supported via optional RS-232 serial interface (cable and terminal software provided separately), enabling direct transfer to Excel, LIMS, or laboratory QA databases. Firmware updates are delivered via USB-to-serial adapter and manufacturer-provided utility—ensuring continued alignment with evolving regulatory guidance and analytical best practices.
Applications
- Regulatory compliance monitoring of nickel in drinking water per WHO Guidelines (0.02 mg/L provisional guideline) and EU Drinking Water Directive (parametric value: 20 µg/L)
- Effluent discharge verification for electroplating, stainless steel manufacturing, and battery recycling facilities
- Baseline and trend analysis in watershed-level environmental monitoring programs
- Educational use in university environmental chemistry and analytical instrumentation laboratories
- Field-deployable screening in conjunction with portable digestion modules for rapid site assessment
- QC/QA support for certified water testing laboratories operating under CNAS accreditation (ISO/IEC 17025)
FAQ
What reagents are required for nickel analysis with the CHNI-120?
The instrument requires standard nickel-specific reagents: dimethylglyoxime (DMG) solution, ammonium buffer (pH ~9–10), and sodium citrate (interference masker). These are supplied separately and must meet ACS or equivalent purity grade.
Can the CHNI-120 measure other metals?
No—the optical configuration, filter set, and pre-programmed algorithm are optimized exclusively for nickel determination via the DMG method. It is not a multi-parameter or generic spectrophotometer.
Is digestion included in the measurement workflow?
No. The CHNI-120 measures only dissolved (filterable) nickel. Total nickel quantification requires separate acid digestion (e.g., HNO₃/HCl microwave digestion) prior to analysis.
How often must the instrument be recalibrated?
Factory calibration remains valid for 6 months under normal use. Users should verify calibration daily using a mid-range standard (e.g., 0.50 mg/L Ni) and fully recalibrate whenever reagent batches change or after maintenance.
Does the device comply with ISO/IEC 17025 requirements?
The CHNI-120 provides metrologically traceable performance characteristics (accuracy, repeatability, linearity) and supports documented calibration records—key inputs for ISO/IEC 17025 method validation. Full compliance depends on lab-specific implementation, including uncertainty budgeting and proficiency testing.
