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Abstract
Studies on duckweed extract indicated that at least some of the magnesium in chlorophyll was replaced by copper. The copper combined not only with chlorophyll, but also with some other plant pigments in duckweed.
The study also demonstrated that HPLC‐AA can be used to study the speciation of the copper and magnesium in duckweed, revealing the total number of such compounds present and the associated organic compounds. HPLC‐AA has the potential of extensive speciation application in many fields of science.
To obtain the information needed the electronic spectra and HPLC‐AA chromatograms of three samples of treated duckweed were recorded. The three samples were: (i) A sample of solution extracted with ethanol from duckweed (DW‐extract); (ii) the product of reaction between DW‐extract and copper aqueous solution; (iii) the extract of duckweed which has been pretreated with copper aqueous solution at pH 5.0.
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