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Sentinel Range

Wilchem Sentinel is a range of Ethylenediaminetetraacetic acid (EDTA) chelates.

EDTA forms sexadentate chelates – they form six bonds to the nutrient to form a
“chelate ring”.
As can be seen in the diagram below showing the octahedral structure of EDTA chelating
a metal ion. The chelate ring is stronger than a single ionic bond and protects the
nutrient and maintains it in solution.
EDTA chelates protect the nutrient from interaction with other crop protection products
making it the most compatible product on the market.

Metal Chelates Definition

IUPAC (International Union of Pure and Applied Chemistry)

“Chelation is the formation of bonds between two or more binding
sites within the same molecule and a single central metal atom.”









Nutrient range

Wilchem Sentinel range covers the three most commonly used micronutrients for broad acre agricultural use including zinc, manganese, copper and blends.

Compatibility Function

The EDTA molecule (ethylenediaminetetraacetic acid) is the strongest chelation agent currently available. The benefit of strong chelate bonds is that it makes this range of products the most compatible micronutrient products for tank mixing and for soil applications. This is very important for furrow injection in alkaline soils and tank mixes that contain soluble phosphates.
The synthetic EDTA molecule does not provide any additional nutritional benefit, it purely acts as a stable transporter of the micronutrients in solution.