Residue Analysis

Residue Analysis

A fruit can look spotless and still carry traces of a chemical that was sprayed on it weeks earlier. Water can look clear and still hold contaminants at levels that no eye or nose can detect. Residue analysis finds these traces and measures them, often at parts per billion or lower. At METS Laboratories, we help growers, exporters, food manufacturers and water suppliers confirm that their products stay within the limits set by regulators and buyers. 

What is Residue Analysis?

Residue analysis is the laboratory detection and measurement of small amounts of chemicals left in a product after growing, processing, treatment or storage.

• Targeted analysis: We look for named chemicals, such as specific pesticides, and measure how much is present.
• Screening: In addition, we search for a wide group of related compounds in one run.
• Unknown identification: Where a sample holds an unexpected substance, we work to identify it.
• Comparison: We compare results with maximum residue limits or your own specification.

Pesticide Residue:

Pesticides are chemicals used to control pests. The term “Pesticide” includes insecticides, herbicides, fungicides and it is well known that over-use of pesticide can lead to dangerous levels of hazardous chemicals entering the food chain. Fresh fruit and vegetables are being consumed in increasing quantities and it is this fresh produce that is most susceptible to pesticide residues. In order to protect consumers, pesticide residues are under strict regulatory control globally. STRC offers wide range of pesticide residues in agro and other food products to ensure that you comply with the maximum residue levels set by many countries.

Chemical Residue:

We offer trace-level chemical residue analysis on agro products, processed food, water and various other products, with results assessed against Codex Alimentarius and GSO limits. Residue analysis includes trace-level detection and identification of unknown residues up to PPM, PPB and PPT levels, depending upon the sample and application. Chemical residue analysis is conducted by chemists with years of industry experience using mass spectrometers, liquid chromatography and other advanced instrumentation. 

Importance of Residue Analysis

Residues matter because small amounts can add up across daily diets and repeated exposure.

• Consumer health: Testing keeps harmful levels out of food and water.
• Market access: Moreover, many countries reject shipments that exceed their residue 
• limits.
• Accurate labelling: Residue data supports claims such as “low residue” or “pesticide tested”.
• Supply chain control: Results show whether suppliers follow good agricultural and processing practice.
• Environmental protection: Finally, residue data helps track what reaches soil and water.

Types of Residues Tested

Different products carry different residues, so labs group the tests by source. 

• Pesticides: Insecticides, herbicides and fungicides in fruit, vegetables, cereals and other crops.
• Veterinary drug residues: Antibiotics and other drugs in meat, milk, eggs, fish and honey.(include hormones test )
• Heavy metals: Lead, cadmium, arsenic and mercury in food and water.
• Mycotoxins: Toxins from moulds in grains, nuts, spices and dried fruit.
• Processing and packaging residues: Solvents, additives and chemicals that migrate from packaging.
• Industrial contaminants: Traces of chemicals that enter food or water from the environment.

What Do PPM, PPB and PPT Mean?

Trace levels use tiny units, so a quick guide helps.

• PPM: One part per million equals 1 mg per kilogram.
• PPB: One part per billion equals 1 µg per kilogram, which is a thousand times smaller than PPM.
• PPT: One part per trillion equals 1 ng per kilogram, which is a thousand times smaller again.
• Why it matters: The lower the unit, the more sensitive the instrument and the more careful the sample preparation.

How is Residue Analysis Performed?

Residue analysis pairs careful sample preparation with highly sensitive instruments.

• Extraction and Filtration: First, we pull the residues out of the sample using suitable solvents. Then, we filter the extract to remove solid particles.
• Clean-up: Next, we remove any material that could interfere with the measurement.
• Separation: After that, chromatography separates the compounds from each other.
• Detection: Then, mass spectrometry identifies each compound and measures its amount.
• Confirmation: Finally, we use mass spectrometry along with other techniques to identify unknown substances.

Which Samples Do We Test?

Residue analysis applies to many products.

• Agro products: Fresh fruit, vegetables, cereals, pulses and spices.
• Processed foods: Snacks, sauces, canned goods, juices and ready meals.
• Animal products: Meat, dairy, eggs, seafood and honey.
• Water: Drinking water, bottled water and process water.
• Other products: Feed, packaging and related materials. 

Residue Analysis at METS Laboratories

Trace-level results need sensitive instruments, careful preparation and experienced interpretation, and we focus on all three.

• Trace-level range: We measure from PPM down to PPT, depending on the sample and the application.
• Unknown residue work: We identify unexpected substances, not only a fixed list of chemicals.
• Experienced chemists: Results come from analysts who know both the instruments and the matrices.
• Market-aware reporting: We compare results with the limits of your target market.

METS Laboratories supports food and agro producers with residue testing aligned to national and international requirements, so products can meet the safety and compliance expectations of local authorities and global buyers. 

Conclusion

Residue analysis turns invisible traces into numbers you can act on. Therefore, it protects consumers, supports exports and keeps supply chains honest. Test against the limits of your target market and repeat testing when suppliers or practices change. Share your product details with METS Laboratories, and we will recommend the right residue analysis plan.

Frequently Asked Questions

1. What is the difference between pesticide residue and chemical residue analysis?
Ans: Pesticide analysis looks for known crop-protection chemicals. Chemical residue analysis covers a wider range of trace substances, including unknown ones.

2. Why do fresh fruit and vegetables need residue testing?
Ans: They are eaten in large amounts, often with little processing, so any residue on the surface can reach the consumer.

3. Can residue analysis detect unknown chemicals?
Ans: Yes. With mass spectrometry and related techniques, labs can identify unexpected residues, depending on the sample and the level via screening method