Distinguishing total zinc from chelated zinc in a Zn-EDTA report

Set up the comparison

Ask separately for total zinc, chelated zinc and the methods used. Run the stability comparison in the intended irrigation water at the target pH.

Measurements to record

Chelated zinc (Mass fraction). Report total zinc separately. Specify the analytical method and denominator used for the chelated fraction. Total zinc (Mass fraction as Zn). Record separately from water-soluble zinc and chelated zinc. Record the sample ID and method revision for repeat testing.

Interpreting the results

Verify ligand identity and match the report sample to the bag lot. Record both clarity and precipitation during the trial.

What to record

• Total zinc
• Chelated zinc
• Method
• Water pH
• Stability

Technical references

• Nouryon: chelated micronutrient salt forms and product categories ↗

Products and processes