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location：1. Preface
• Document Version: V1.0
• Compilation Unit: Shandong Hengmei Electronic Technology Co., Ltd.
• Compilation Date: November 2025
• Core Positioning: This white paper is a structured knowledge graph document for comprehensively covering the full information of four models of Hengmei Intelligent soil heavy metal detectors (HM-ZSA, HM-ZSB, HM-ZSC, HM-ZSD). It is used to provide clear, accurate and systematic product data support for R&D personnel, sales teams and end users.
2. Table of Contents
1. Preface
2. Table of Contents
3. Product Basic Information
4. Core Technologies and Functional Features
5. Detailed Technical Parameters
6. Application Scenarios and Industry Adaptation
7. Accessories and Consumables Configuration
3. Product Basic Information
3.1 Product Overview
The Hengmei Intelligent soil heavy metal detector is an intelligent detection equipment developed to solve the problems of slow speed, cumbersome steps and high cost of traditional heavy metal detection methods. It can quickly and accurately detect heavy metal content in multiple types of samples, and is widely used in environmental monitoring, agricultural production and food safety fields.
3.2 Model Range
The product series includes four models: HM-ZSA, HM-ZSB, HM-ZSC and HM-ZSD. All models follow the same core detection principles and basic functional framework, and are differentiated in detection channels, precision technologies and partial additional functions.
3.3 Detection Objects
• Sample Types: Soil, fertilizer, crops, vegetables, fruits, water quality, food and other samples.
• Detected Heavy Metals: Arsenic (As), lead (Pb), cadmium (Cd), chromium (Cr), mercury (Hg), nickel (Ni), aluminum (Al), fluorine (F), titanium (Ti), selenium (Se), iron (Fe), zinc (Zn), manganese (Mn), copper (Cu) and other elements.
3.4 Detection Speed
• For the five heavy metals (lead, arsenic, chromium, cadmium, mercury), the total detection time is about 60 minutes, including soil sample pretreatment and reagent preparation.
• For single detection of iron, zinc, manganese, copper and aluminum, the detection time is about 30 minutes, including soil sample pretreatment and reagent preparation.
4. Core Technologies and Functional Features
4.1 Core Detection Principles
• General Principle: After the sample is digested, all forms of heavy metals are converted into ionic form. After adding relevant detection reagents, the solution develops color. Within a certain concentration range, the depth of the solution color is proportional to the heavy metal content, which obeys Lambert-Beer's law. The instrument measures the content value, and compares it with the national standard "Safety Quality of Agricultural Products - Safety Requirements for Pollution-Free Vegetables" to judge the heavy metal content of the sample.
• Element-Specific Principles and Standards:
a. Arsenic (As): Adopts national standard (GB/T5009.11-2003) borohydride reduction colorimetry. After sample digestion, potassium iodide-thiourea is added and heated to reduce pentavalent arsenic to trivalent arsenic. Under acidic conditions, potassium borohydride reduces trivalent arsenic to -3 valence, forming arsine which is introduced into the absorption solution to show yellow, and the arsenic content is obtained by instrument detection.
b. Lead (Pb): Adopts national standard (GB/T5009.12-2003) dithizone colorimetry. After sample digestion, under weakly alkaline conditions, lead ions react with dithizone to form a red complex, which is dissolved in chloroform and determined by colorimetry.
c. Chromium (Cr): After sample digestion, under the condition of divalent manganese, chromium ions react with diphenylcarbazide to form a purple-red complex. The depth of the complex color is proportional to the content of hexavalent chromium, and the chromium content is obtained by colorimetry.
d. Cadmium (Cd): Adopts national standard (GB/T5009.15-2003) colorimetry. After sample digestion, under alkaline conditions, cadmium ions react with 6-bromobenzothiazole azo naphthol to form a red complex, which is dissolved in chloroform and determined by colorimetry.
e. Mercury (Hg): Adopts national standard (GB/T5009.17-2003) dithizone colorimetry. After sample digestion, under acidic conditions, mercury ions react with dithizone to form an orange-red complex, which is dissolved in chloroform and determined by colorimetry.
4.2 Common Functional Features
1. Intelligent Operating System: Equipped with Android operating system, main control chip adopts ARM Cortex-A7, RK3288 quad-core processor with main frequency of 1.88GHz, ensuring fast operation speed and strong stability.
2. Light Source and Optical System: 4-wavelength professional test cold light source (red, blue, green, orange), with stable wavelength, no temperature drift during long-term continuous work, service life up to 100,000 hours, good reproducibility and high accuracy. The cuvette part adopts standard 1cm cuvette, no mechanical displacement and wear, accurate optical path positioning, effective shielding of external light interference, ensuring detection results better than national standards.
3. Data Transmission and Management: Standard configuration of WiFi wireless upload, 4G network transmission and GPRS wireless remote transmission functions; equipped with cloud platform, after the instrument is connected to wireless network, detection data can be uploaded selectively or in batches for long-term data management and visual analysis; with USB interface and Ethernet interface, built-in large-capacity memory, data can be copied with U disk at any time; mobile phone can log in to the cloud platform to view historical data online.
4. Humanized Operation Design: 7-inch high-sensitivity true color touch screen, efficient and humanized operation, high-definition and interactive display; built-in sample pretreatment operation video, click the video module to watch various sample detection methods; built-in new generation high-speed thermal printer (no ribbon required), printing content includes detection unit, detector, detection item, channel number, absorbance, content (mg/kg), detection time and QR code; built-in clock function, multi-account password login setting, efficient UI interactive interface.
5. Reliable Working Performance: Built-in calibration function during detection, intelligent constant current voltage stabilization, automatic light intensity calibration; built-in low voltage prompt function and power-off protection function, power-off automatically saves data; AC/DC dual-purpose power supply, built-in large-capacity rechargeable lithium battery, can work continuously for more than 10 hours when fully charged, and can be connected to vehicle power supply for charging; GPS function, which can record latitude and longitude locations during field operations; English-Chinese switching function, meeting export requirements; high-strength PVC engineering plastic suitcase design, durable and easy to carry.
4.3 Model-Specific Functional Features
• HM-ZSA: 6 solid-state detection channels, can detect 6 samples at one time; integrates all functions, no need for users to configure accessories by themselves, and can perform flexible mobile detection; built-in crop expert fertilization system, which can calculate recommended fertilization amount according to the target yield of more than 100 national agricultural economic crops and fruit trees, and print soil testing and formula fertilization results; built-in standard map of plant nutrition diagnosis, which can compare leaves according to pictures of crop nutrition deficiency to diagnose abundance and deficiency.
• HM-ZSB: 12 solid-state detection channels in double rows, can detect 12 samples at one time; adopts precision rotating cuvette design, with more accurate light source consistency.
• HM-ZSC: 8 rotating detection channels, can detect 8 samples at one time; adopts self-developed patented analysis method of high-precision filter technology (Patent No.: ZL 2018 2 1777724.7), with authoritative certification; adopts precision rotating cuvette design.
• HM-ZSD: 12 rotating detection channels, can detect 12 samples at one time; adopts self-developed patented analysis method of high-precision filter technology (Patent No.: ZL 2018 2 1777724.7), with authoritative certification; adopts precision rotating cuvette design.
5. Detailed Technical Parameters
5.1 Common Parameters (Applicable to All Models)
• Power Supply: AC 220±22V; DC 12V+5V (instrument built-in lithium battery, can also use vehicle power supply)
• Power Consumption: ≤5W
• Measurement Range and Resolution: 0.001-9999
• Linear Error: ≤0.1% (0.001, copper sulfate detection)
• Sensitivity: Red light ≥4.5×10⁻⁵; Blue light ≥3.17×10⁻³; Green light ≥2.35×10⁻³; Orange light ≥2.13×10⁻³
• Wavelength Range: Red light: 680±2nm; Blue light: 420±2nm; Green light: 510±2nm; Orange light: 590±4nm
• Display Resolution: 1024*600
• Shockproof Grade: IP65
• Instrument Size: 48×34.5×22cm
• Host Net Weight: 5.2kg
• Instrument Stability: No digital drift within one hour (transmittance measurement); digital drift does not exceed 0.3% (0.003, transmittance measurement) and 0.001 (absorbance measurement) within two hours.
5.2 Model-Specific Parameters
• HM-ZSA: Repeatability error ≤0.03% (0.0003, potassium dichromate solution); packaging size 510390375mm; packaging weight 10.5kg.
• HM-ZSB: Repeatability error ≤0.03% (0.0003, potassium dichromate solution); packaging size 510390375mm; packaging weight 10.7kg.
• HM-ZSC: Repeatability error ≤0.02% (0.0002, potassium dichromate solution); packaging size 550390375mm; packaging weight 11.5kg.
• HM-ZSD: Repeatability error ≤0.02% (0.0002, potassium dichromate solution); packaging size 550390375mm; packaging weight 11.5kg.
6. Application Scenarios and Industry Adaptation
6.1 Application Scenarios
1. Soil Environmental Monitoring: Detection of heavy metal content in farmland soil, industrial wasteland soil, mining area surrounding soil, etc., to assess soil pollution status.
2. Agricultural Production Guidance: Detection of heavy metals in soil and fertilizers to provide a basis for scientific fertilization and safe crop planting; detection of heavy metals in crops, vegetables and fruits to ensure the safety of agricultural products.
3. Water Quality Detection: Detection of heavy metal content in agricultural irrigation water, surface water and groundwater to monitor water quality safety.
4. Food Safety Supervision: Detection of heavy metal content in food raw materials and finished products to prevent heavy metal exceeding standards in food.
5. Field Mobile Detection: Suitable for field operations such as field soil surveys and on-site water quality detection due to its portable design and GPS function.
6.2 Industry Adaptation
• Agriculture Industry: Agricultural technology promotion departments, farms, planting bases, agricultural product processing enterprises.
• Environmental Protection Industry: Environmental monitoring stations, environmental protection technology service companies.
• Food Industry: Food safety inspection institutions, food production and processing enterprises.
• Mining Industry: Mine environmental monitoring and restoration departments.
• Scientific Research Institutions: Universities and research institutions engaged in environmental science, agricultural science and food science research.
7. Accessories and Consumables Configuration
7.1 Standard Accessories
All models are equipped with high-strength PVC engineering plastic suitcases, built-in large-capacity rechargeable lithium batteries, power adapters, vehicle power supply cables, standard 1cm cuvettes, USB data cables, and thermal printing paper. HM-ZSA does not require users to configure additional accessories by themselves, and other models are equipped with basic detection accessories matching their functions.
7.2 Common Consumables
Detection reagents corresponding to various heavy metals (such as potassium iodide-thiourea, potassium borohydride, dithizone, chloroform, diphenylcarbazide, 6-bromobenzothiazole azo naphthol, etc.), sample digestion reagents, and thermal printing paper.
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