Are all EDTAs the same?

Discussion in 'Hydroponic Growing' started by Rapayich, Nov 30, 2022.

  1. Hi,

    I am making my own fertiliser solution. In doing so, I am considering multiple different brands of EDTA Copper, Zn and Manganese.

    However, I notice discrepancies in the stable ph ranges of the same EDTA nutrient. For example:

    Brand A EDTA Copper is stable between pH 1 - 10
    Brand B EDTA Copper is stable between pH 4 - 8

    Is the wider ph stability of Brand A a marketing tactic or a legitimate figure? In my head they are both EDTA copper so should be stable in exactly the same ph ranges. Possibly Brand A is stating the stability range in which there is still some chelation and brand B is stating the pH range in which there is full chelation?

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  2. Curious to see what you find out here. Suspect you are on the right track though, with it either being marketing blah blah blah or differences in how/what they measure.

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