Binzhenghong SGD-60 Automated Graphite Block Digestion System with 60-Position Capacity

Overview

The Binzhenghong SGD-60 Automated Graphite Block Digestion System is an integrated, high-throughput sample preparation platform engineered for trace elemental analysis in regulated and research laboratories. It implements programmable, sequential thermal digestion using a high-density, PTFE-coated graphite heating block — a design principle grounded in uniform conductive heat transfer and chemical inertness. Unlike conventional hot plates or open-vessel electric digesters, the SGD-60 integrates eight independent reagent delivery lines, ultrasonic-sensing volumetric finalization, synchronized mechanical agitation, and dual-zone temperature control to execute EPA, ISO, and GB-compliant digestion protocols without manual intervention. Its architecture supports method-driven workflows required for ICP-MS, AAS, and HG-AFS quantification of heavy metals (e.g., As, Cd, Cr, Pb, Hg, Ni) in complex solid and semi-solid matrices, including soils, sediments, sludges, and biological tissues.

Key Features

• 60-position graphite digestion block with PTFE–epoxy composite coating, rated for continuous operation up to 260 °C and resistant to HNO₃, HF, HCl, and H₂O₂ under reflux conditions
• Dual independent PID temperature control zones: one for block heating (range: ambient to 260 °C; precision: ±0.1 °C), another for optional cooling module integration (not included)
• Eight chemically resistant peristaltic pumps with individual flow calibration, enabling automated multi-reagent addition (e.g., HNO₃ → H₂O₂ → HF sequence) with cross-contamination isolation
• Ultrasonic level sensing system for precise post-digestion volume adjustment in 50 mL PFA or high-purity PTFE tubes; typical volumetric accuracy ≤0.5% RSD at 50 mL
• Mechanically actuated lift-and-shake assembly with adjustable frequency (10–60 Hz) and amplitude, ensuring homogeneous suspension of particulate samples during acid contact
• 10-inch industrial-grade capacitive touchscreen interface with embedded method library, audit-trail-capable event logging, and USB export of run parameters and temperature profiles
• Compliance-ready firmware architecture supporting user-defined electronic signatures, method versioning, and timestamped operational records aligned with GLP and ISO/IEC 17025 documentation requirements

Sample Compatibility & Compliance

The SGD-60 accommodates standard 50 mL and 60 mL digestion vessels fabricated from analytical-grade PTFE or translucent PFA — materials certified to ASTM D4897 and USP Class VI specifications. It validates performance across internationally recognized digestion standards, including EPA Methods 3010A, 3050B, 3060A (soil/sediment), EPA 200.7/200.8 (aqueous), GB/T 22105.1–2008 (total As/Cd/Pb in soil), and GB/T 17138–1997 (Cu/Zn in agricultural products). All thermal ramping, hold times, and reagent dosing sequences are programmable per ICH Q2(R2) validation principles. The system’s ±1 °C inter-well temperature consistency (measured per ASTM E220) ensures reproducible matrix decomposition critical for sub-ppb detection limits.

Software & Data Management

Control software operates natively on the onboard Linux-based HMI, featuring a hierarchical user permission system (administrator, analyst, viewer), encrypted method storage, and real-time graphing of block temperature vs. time. Each digestion run generates a machine-readable .csv log containing start/stop timestamps, setpoint deviations, pump actuation events, and ultrasonic volume confirmation signals. Data exports support LIMS integration via standard RS-232 or optional Ethernet TCP/IP interface. Firmware conforms to FDA 21 CFR Part 11 Annex 11 expectations for electronic records: all parameter changes trigger automatic audit trails with operator ID, reason-for-change field, and immutable timestamps.

Applications

• Environmental laboratories performing regulatory compliance testing of contaminated land, landfill leachates, and dredged sediments per EU Soil Framework Directive and China’s GB 15618–2018
• Food safety labs conducting heavy metal screening in rice, tea, spices, and infant formula under GB 2762–2022 and EU Commission Regulation (EC) No 1881/2006
• Pharmaceutical QC units validating elemental impurities in excipients and APIs per ICH Q3D guidelines using USP /
• Geochemical research facilities executing multi-acid digestion of silicate-rich rocks and ores prior to ICP-OES quantification
• Waste characterization studies supporting circular economy assessments of e-waste, catalysts, and spent batteries per SJ/T 11365–2006 and IEC 62321–5

FAQ

Does the SGD-60 support HF digestion for silicate matrix dissolution?

Yes — the PTFE-coated graphite block and PFA/PTFE consumables are chemically compatible with hydrofluoric acid up to 20% v/v at temperatures ≤180 °C. Optional reflux caps are provided for controlled HF vapor management.
Can digestion methods be exported and shared between multiple SGD-60 units?

Yes — method files (.sgdm) are portable and retain all step definitions, reagent assignments, and safety interlocks. Import/export occurs via USB flash drive with SHA-256 checksum verification.
Is remote monitoring supported?

Local network monitoring is enabled via HTTP-based status dashboard; full remote control requires optional industrial IoT gateway (sold separately) compliant with MQTT 3.1.1 and TLS 1.2 encryption.
What maintenance intervals are recommended for the peristaltic pumps?

Pump tubing should be replaced every 6 months under continuous use or after 500 digestion cycles; calibration verification is advised quarterly using gravimetric dispensing checks per ISO 8655-5.
Does the system meet CE or UL safety certification requirements?

The SGD-60 complies with IEC 61010-1:2010 for laboratory electrical equipment and carries CCC certification for domestic China deployment. CE marking is available upon request for EU-market configurations with updated EMC and LVD testing reports.