Soil Heavy Metal Detector

I. Product Overview

High-precision soil heavy-metal detector.

Soil heavy-metal pollution has become an increasingly serious problem. The accumulation of heavy metals such as cadmium, copper, arsenic, chromium, mercury, nickel, aluminum, fluorine, titanium, selenium, iron, zinc and manganese in the plow layer of soil has become one of the major environmental issues we face. Heavy metals in soil enter the food chain through enrichment in crops, posing a serious threat to human and animal health. The mining of non-ferrous metal ores, the discharge of industrial "three wastes", the accumulation of heavy-metal-containing wastes, sewage irrigation in agricultural production, and the unreasonable use of agrochemicals can all cause harmful heavy-metal elements to enter the soil directly or indirectly, leading to serious excess of heavy metals in soil, crops, fruits and vegetables, water and aquatic products. However, current heavy-metal determination methods are slow, cumbersome and require expensive instruments. In response to this situation, we have developed a rapid heavy-metal determination method.

II. Detection Items

Detection items: Rapid combined determination of arsenic, lead, cadmium, chromium, mercury, nickel, aluminum, fluorine, titanium, selenium, iron, zinc, manganese, copper, etc. in samples of soil, fertilizer, crops, vegetables, fruit, water and food.

III. Test Speed

Test speed: Detection of the five items lead, arsenic, chromium, cadmium and mercury takes about 60 minutes in total (including soil sample pretreatment and reagent preparation); single-item detection of iron, zinc, manganese, copper and aluminum takes about 30 minutes (including pretreatment and reagent preparation).

IV. Detection Principle

(1) After the sample is digested, all forms of heavy metals (including As, Pb, Cd, Cr, Hg, Ni, Al, F, Ti, Se, Fe, Zn, Mn, Cu, etc.) are converted into ionic state. After adding the relevant detection reagent, color develops. Within a certain concentration range, the depth of the solution color is proportional to the heavy-metal content, obeying the Lambert–Beer law. The instrument then measures to obtain the content value, which is compared with the permissible limits specified in the national food-safety standard GB 2762 for contaminants in food, to determine whether the sample heavy-metal content exceeds the limit. (2) Detection principles and adopted standards for each heavy metal: 1. Arsenic (As): National standard GB/T 5009.11-2003, borohydride reduction colorimetry. After digestion, add potassium iodide–thiourea and heat to reduce pentavalent arsenic to trivalent arsenic; under acidic conditions potassium borohydride reduces trivalent arsenic to arsenide (AsH₃), which is led into the absorption solution producing a yellow color, measured by the instrument. 2. Lead (Pb): National standard GB/T 5009.12-2003, dithizone colorimetry. After digestion, under weakly alkaline conditions lead ions react with dithizone to form a red complex, dissolved in chloroform, then colorimetrically measured. 3. Chromium (Cr): After digestion, in the presence of divalent manganese, chromium ions react with diphenylcarbazide to form a purple-red complex; the color depth is proportional to hexavalent chromium content; colorimetric measurement gives chromium content. 4. Cadmium (Cd): National standard GB/T 5009.15-2003, colorimetry. After digestion, under alkaline conditions cadmium ions react with 6-bromo-phenylazothiazole naphthol to form a red complex, dissolved in chloroform, then colorimetrically measured. 5. Mercury (Hg): National standard GB/T 5009.17-2003, dithizone colorimetry. After digestion, under acidic conditions mercury ions react with dithizone to form an orange-red complex, dissolved in chloroform, then colorimetrically measured.

V. Key Features

1. This instrument integrates all functions into one unit; users need not prepare their own accessories and can perform flexible on-site and mobile testing.

2. Android smart operating system; the main control chip uses ARM Cortex-A7, RK3288 quad-core processor at 1.88 GHz for faster operation and stronger stability.

3. ★ Dual-row 12 detection channels (solid-state design) allow up to 12 samples to be tested at once, greatly improving detection efficiency and reducing cost.

4. Built-in calibration during detection, intelligent constant-current and stabilized voltage, and automatic light-intensity calibration ensure detection accuracy.

5. Standard Wi-Fi wireless module for fast data upload; an optional 4G module enables outdoor data upload.

6. Equipped with a Smart Cloud Agriculture Platform; after connecting to a wireless network, detection data can be selectively or batch uploaded for long-term data management and visual analysis.

7. Both USB and Ethernet interfaces with built-in large-capacity memory; data can be copied anytime via U disk.

8. Detection data can be viewed anytime on a mobile phone by logging into the cloud platform.

9. 4-wavelength professional cold light source (red, blue, green, orange) with stable wavelength, no thermal drift during long continuous operation, lifespan up to 100,000 hours, good repeatability and high accuracy.

10. The colorimetric cell uses a standard 1 cm cuvette with no mechanical displacement or wear; precise optical-path positioning effectively shields external light interference, ensuring results better than national standards.

11. The instrument system includes sample-pretreatment operation videos; testing personnel can watch the video module for each method without reading the manual, enabling quick and convenient guidance for beginners.

12. New-generation high-speed thermal printer (no ribbon); print content includes testing unit, operator, test item, channel No., absorbance, nutrient content (mg/kg), test time, and QR code, etc.

13. High-sensitivity 7-inch HD color touch screen for efficient and user-friendly operation with clear, highly interactive display, greatly reducing the tedious operation and errors of traditional instruments, and with multiple software copyrights.

14. Built-in clock function for convenient operation-time recording and long-term traceability.

15. Multi-account login with user name and password and an efficient UI; different users can freely add and edit detection information for long-term use.

16. GPS function records latitude/longitude during field work to meet special user needs.

17. AC/DC dual power supply; built-in large-capacity rechargeable lithium battery with power display and low-voltage alarm; can work continuously for over 10 hours when fully charged, and can be connected to vehicle power for charging.

18. ★ The instrument has a Chinese/English switch function to meet export requirements.

19. High-strength PVC engineering-plastic carrying case, sturdy, durable and portable.

VI. Technical Parameters

VII. After-Sales Service

The instrument has a one-year warranty with lifetime free repair service; we provide free instrument shipping, free training. Lifetime free technical support for soil and fertilizer and other agriculture-related matters!