How to verify a Certificate of Analysis (CoA) for chemicals supply

To verify a Certificate of Analysis (CoA) for the chemicals you order, follow these steps:

1. Check the Batch Number and Date

- Ensure the CoA includes the batch number and manufacturing date. These details link the document to the specific batch of chemicals you received and confirm that the test results are recent.

2. Review the Ingredients and Potency

- Compare the ingredient list and potency data on the CoA with the product’s label. This step ensures that the chemical composition and concentrations match the specifications provided.

3. Analyze the Purity and Contaminant Results

- Look for test results on the CoA that confirm the purity levels and absence of contaminants. This includes heavy metals, pesticides, and microbial agents. Ensure that any detected contaminants are within acceptable limits.

4. Look for Third-Party Verification

- Verify that the CoA includes third-party testing results. Reputable third-party laboratories or certification bodies (e.g., NSF International) provide unbiased evaluations and ensure the accuracy of the CoA.

5. Check Laboratory Credentials

- Confirm the laboratory’s credentials and accreditation. The CoA should include the name and address of the testing laboratory, as well as any relevant certifications (e.g., ISO 17034 for reference standards, ISO 9001 for general quality management).

6. Expiry or Retest Date

- Check for an expiry or retest date on the CoA. This ensures that the chemical is still within its valid period and meets quality standards.

7. Signature and Authorization

- Ensure the CoA is signed by an authorized person, such as the head of the laboratory or a qualified inspector. This signature validates the authenticity of the document.

8. Contact the Supplier

- If you have any doubts about the CoA, contact the chemical supply manufacturer. They should be able to provide additional information or clarify any discrepancies.

9. Cross-Reference with Product Labels

- Cross-reference the information on the CoA with the labels on the chemical containers. This helps ensure that the batch you received matches the tested batch.

10. Use Search Tools

- Many chemical supply provides online search tools where you can enter the catalog number and lot number to retrieve the CoA and SDS (Safety Data Sheet) for the specific product.

By following these steps, you can ensure that the CoA for the chemicals you order is authentic and that the products meet the required quality and safety standards.