In the context of global trade, inspection and quarantine departments serve as a line of defense to safeguard national biosafety and food quality safety. Their level of technical equipment directly affects the regulatory effectiveness and public health protection capabilities of imported and exported agricultural products. A scientific and efficient system of testing instruments and equipment is the cornerstone for fulfilling legal responsibilities, responding to complex risks, and maintaining trade fairness. This article will systematically sort out and analyze the core testing instruments and equipment that the current inspection and quarantine departments rely on to ensure the quality and safety of agricultural products, as well as their key roles.

1、 Strategic positioning and composition framework of detection equipment system

The testing work of the inspection and quarantine department follows the principle of "risk prevention, rapid screening, and accurate confirmation". The corresponding equipment system also presents the characteristics of hierarchical and multi-dimensional configuration:

On site rapid screening layer: equipped with portable devices for preliminary screening at ports, warehouses, and other locations, achieving real-time risk warning and rapid identification of suspicious products.

Laboratory precision confirmation layer: relying on large precision instruments in the laboratory, quantitative analysis and authoritative confirmation of positive samples or high-risk products are carried out according to legal standards.

Full process quality control layer: covering multi parameter monitoring equipment from moisture, freshness to nutritional content, serving more comprehensive quality evaluation and compliance verification.

2、 Detailed explanation of core testing instruments and equipment

The following are the key instruments used by inspection and quarantine departments to address major agricultural product safety risks:

　　1. Pesticide residue detector

Core function: Accurately monitoring whether hundreds of pesticide residues in agricultural products exceed China's and target market limit standards is a core tool for preventing the risk of excessive pesticide residues.

Equipment type and characteristics:

Gas chromatography-mass spectrometry (GC-MS/MS): laboratory confirmation mainstay. The qualitative and quantitative analysis of volatile, semi volatile organic phosphorus, pyrethroids and other pesticides with high sensitivity and specificity has legal validity.

LC-MS/MS: Laboratory confirmation mainstay. Suitable for precise detection of most highly polar and thermally unstable pesticides (such as amino esters and some herbicides), complementary to GC-MS/MS.

Rapid detection equipment (such as enzyme inhibition method, immunoassay method): a powerful tool for on-site screening. Qualitative or semi quantitative screening of organophosphorus and carbamate pesticides can be performed in a short period of time (usually 10-30 minutes) for initial screening and diversion of large quantities of samples.

2. Heavy metal detector

Core function: To detect the content of toxic and harmful elements such as lead, cadmium, mercury, arsenic, chromium, etc. in agricultural products (especially grains, aquatic products, fruits and vegetables), and prevent heavy metal pollution from harming consumer health.

Equipment type and characteristics:

Inductively Coupled Plasma Mass Spectrometer (ICP-MS): Laboratory equipment. It is currently one of the sensitive and accurate heavy metal analysis techniques with extremely low detection limits, wide linear range, and the ability to simultaneously analyze multiple elements.

Atomic Absorption Spectrometer (AAS): A classic laboratory equipment. Including flame analysis (FAAS) and graphite furnace analysis (GFAAS), which have good stability and relatively low operating costs, they are reliable methods for detecting specific heavy metals such as lead and cadmium.

Atomic Fluorescence Spectrometer (AFS): Laboratory specific equipment. Specially suitable for ultra trace analysis of elements such as mercury, arsenic, selenium, etc., with high sensitivity and significant advantages in specific element detection.

X-ray fluorescence spectrometer (XRF): a portable screening device. It can achieve non-destructive and rapid on-site screening, especially suitable for preliminary determination of heavy metal content in solid samples such as rice and soil.

3. Fungal toxin detector

Core function: To detect various fungal toxins produced by fungi, such as vomitoxin, zearalenone, ochratoxin, etc., to prevent their carcinogenic and teratogenic risks.

Equipment type and characteristics:

High Performance Liquid Chromatography (HPLC) and Ultra High Performance Liquid Chromatography (UHPLC): Core laboratory equipment. Usually equipped with a fluorescence detector (FLD) or tandem mass spectrometry detector (MS/MS), it is a standard method for accurate quantitative analysis of various fungal toxins.

Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS): A laboratory validated tool for simultaneous analysis of multiple toxins. Capable of conducting one-time screening and quantification of dozens of fungal toxins, particularly suitable for the analysis of complex matrices and unknown risk samples.

Immunoassay rapid detection card/reader: an on-site rapid screening tool. Based on antigen antibody specific reactions, specific toxins can be qualitatively or semi quantitatively determined within a few minutes, making the operation simple.

4. Aflatoxin detector (specialized equipment)

Core function: Conduct specialized high-sensitivity detection of strong carcinogens aflatoxins (B1, B2, G1, G2) in high-risk agricultural products such as peanuts, corn, nuts, and their products.

Equipment type and characteristics:

Aflatoxin specific fluorescence detection system: often used in combination with HPLC/UHPLC, utilizing the fluorescence characteristics of aflatoxin itself and greatly improving detection sensitivity through post column derivatization and other techniques.

Immunoaffinity column purification photochemical derivatization system: a specialized combination of pretreatment and detection. The immune affinity column achieves efficient purification, and photochemical derivatization does not require the use of toxic chemical derivatization reagents, making it a green detection solution that meets international standards.

5. Grain moisture detector

Core function: Quickly measure the moisture content of grain crops such as grains and beans. Moisture is a key indicator that affects the safety of grain storage (anti mold), trade pricing, and processing quality.

Equipment type and characteristics:

Halogen rapid moisture analyzer: commonly used equipment in laboratories and on site. Using the principle of weight loss through heating, results can be obtained within a few minutes with high accuracy and good repeatability.

Near infrared grain moisture analyzer: on-site and online rapid detection equipment. By utilizing near-infrared spectroscopy technology, non-destructive and rapid (within seconds) measurements can be achieved, and other components such as proteins and fats can be predicted simultaneously, making it suitable for large-scale screening in ports.

3、 Trends in Technological Development and Prospects for System Efficiency

Currently, the testing equipment system of inspection and quarantine departments is evolving towards the direction of "intelligence, speed, integration, and networking":

Intelligence: The device is equipped with AI algorithms that automatically optimize methods, recognize graphs, and determine results.

Rapid development: Develop more on-site rapid verification technologies to shorten the cycle from screening to law enforcement.

Integration: Develop a "one-stop" pre-processing platform and a multifunctional integrated detection platform to improve efficiency.

Networking: Build a Laboratory Information Management System (LIMS) and the Internet of Things to achieve real-time uploading of detection data, risk big data analysis, and remote diagnosis.

Conclusion:

A comprehensive and advanced list of testing instruments and equipment is the "teeth" and "eyes" for the inspection and quarantine department to perform its duties scientifically. From portable initial screening to laboratory precision judgment, from single indicators to multi risk synchronous monitoring, this constantly upgrading technical equipment system not only greatly improves the efficiency and accuracy of port clearance supervision, but also provides irreplaceable technical support for effectively intercepting unqualified agricultural products, protecting China's agricultural production ecological safety, and safeguarding consumer health rights and interests. It is an important technical guarantee for China to participate in global agricultural product trade governance and establish a responsible national image.