I. Introduction The instrument according to the national standard spectrophotometric instrument developed for fast detection of heavy metal content in soil, food and various water bodies, environmental monitoring is widely used in agriculture, food, pharmaceutical, environmental emergency monitoring, water testing, hospital waste monitoring and other fields. Second, the instrument features 1. Small desktop, can be used for the laboratory or the field to achieve different heavy metals testing soil, food and various water bodies; 2. the use of advanced cold light source, digital control and data processing technology to ensure the light source stability and accuracy of data; 3. sample chamber is square cuvette, for a variety of specifications cuvette, ensure accurate measurements, while more support expansion projects; 4. can detect real-time data storage, storage capacity of up to 10000 group (including detection date, test items, test results); 5. instrument memory curve can be called directly and automatically calculate the concentration of the results, along with 80 expansion curve space, user-friendly establishment of extended range and extended test items; 6. With Automatic multi-point linear fit function, users can directly call the expansion project curve fitting program, without having to manually calculate the curve; 7. High-quality low-power 3.5-inch LCD backlit LCD screen, clearly show the determination of the project, the absorbance values, concentration and other comprehensive information; 8. touch membrane keyboard, moisture durable, one-button single-function design, fast and convenient operation 16 function keys; 9. Apparatus built high-end brand miniature thermal line printer, you can print the test results fast, easy data retention; 10. Support line processing test data, the current data and historical data can be transferred to a computer for storing processed through the data line; 11. The instrument can be extended to achieve boron, manganese, iron, copper, calcium, magnesium, sulfur, chlorine, zinc, silicon and other trace element detection. Third, the technical indicators (a) Source life: ≥100000h (2) Optical Stability: ≤0.005A / h (3) the sample chamber: Multi cuvette (4) measurement error: ≤ ± 5% or ± 10% ( 5) Repeatability error: ≤ ± 3% (6) of storage space: 10 000 test data set (7) Number of curves: more than 80 (8) Display: 3.5-inch LCD backlit LCD screen (9) Printing method: Thermal Line print (10) Communication Interface: Standard RS232 (11) Power supply: 220V (12) standard parameters: mercury, lead, chromium, cadmium, arsenic