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Chelation Principle
GLDA forms a 1:1 chelate with cobalt. For complete complexation under commercial conditions, use 1.15–1.30 moles of GLDA per mole of cobalt. A 20% molar excess (1.2:1) is recommended for most formulations.
Application Guide
Chelate cobalt with GLDA first, prepare molybdate separately, and combine slowly at controlled pH and temperature to keep both metals soluble.
To maximize the long-term stability of liquid cobalt and molybdenum micronutrient formulations by preventing precipitation and minimizing cobalt molybdate formation through proper use of GLDA.
GLDA forms a 1:1 chelate with cobalt. For complete complexation under commercial conditions, use 1.15–1.30 moles of GLDA per mole of cobalt. A 20% molar excess (1.2:1) is recommended for most formulations.
Use deionized or softened water whenever possible. Calcium, magnesium and iron impurities reduce chelation efficiency.
Charge the mixing tank with water, add GLDA 47% Liquid under agitation, and adjust the pH to approximately 8.0–9.0 before introducing cobalt.
Slowly add cobalt sulfate or cobalt nitrate into the GLDA solution while maintaining vigorous agitation. Continue mixing for 20–40 minutes to ensure complete complexation.
Dissolve sodium molybdate completely in a separate tank before combining with the cobalt solution.
Slowly add the molybdate solution into the cobalt-GLDA solution over 30–60 minutes while maintaining good agitation. Never add concentrated cobalt directly into concentrated molybdate.
Adjust the finished formulation to pH 6.5–7.5. This range provides the best compromise between GLDA complex stability and molybdate stability.
Carry out cobalt complexation between 20–35°C. Avoid temperatures above 50°C, which may accelerate molybdate polymerization.
High concentrations of sulfates, nitrates, chlorides and alkali salts can reduce long-term stability. Keep total dissolved solids below approximately 40–45% whenever practical.
Iron, copper and aluminum compete strongly with cobalt for GLDA. If these metals are present, increase the GLDA dosage accordingly.
After blending, continue mixing for 30–60 minutes, filter through a 5–10 μm filter, and allow the formulation to stand for approximately 24 hours before packaging.
GLDA : Co = 1.20 : 1 (molar basis) is recommended for most commercial formulations.
Low Ca / Mg / Fe
1.15–1.30 mol GLDA / mol Co
GLDA → Cobalt → Molybdate
Cobalt → Molybdate → GLDA
6.5 – 7.5
Chelation below 35°C. Never exceed 50°C.
5–10 micron
54°C accelerated aging, freeze–thaw cycles, ambient storage
GLDA does not permanently “shield” cobalt. Instead, it maintains cobalt predominantly in a soluble chelated form, significantly reducing the probability of cobalt molybdate nucleation and precipitation during manufacturing and storage.
Reliable micronutrient delivery for fertilizers, foliar nutrition and specialty agricultural formulations.
Readily biodegradable, biobased chelating agent for sustainable cleaning, personal care, and agricultural micronutrient formulations across a wide pH range.
Talk with our technical team about recommended products, samples, and formulation support for this use case.