Magnesium chloride hexahydrate

Various chemical reagents were sourced from suppliers across different regions. Ferric chloride and sodium nitrite were acquired from Ajax Finechem (New South Wales, Australia). Gallic acid and CIP hydrochloride were purchased from Bio Basic Inc. in Markham, ON, Canada. Epigallocatechin gallate and quercetin were procured from Sigma–Aldrich (Steinheim, Germany). Copper sulfate pentahydrate and hydrochloric acid were purchased from QRëC (Auckland, New Zealand). Chloroform and acetic acid were from JT Baker (Phillipsburg, NJ, USA). Folin–Ciocalteu reagent was purchased from Carlo Erba (Barcelona Spain). Ammonium chloride, magnesium chloride hexahydrate, manganese sulfate, phenol detached crystals, and sodium hypochlorite were acquired from Loba Chemie (Mumbai, India). Aluminum chloride hexahydrate, bromophenol blue, sodium acetate, and calcium carbonate were acquired from KemAu (Sydney, Australia). Vanillin was purchased from Merck (Darmstadt, Germany). We obtained sodium hydroxide and sodium chloride from RCI Labscan located in Thailand. Other chemicals and solvents were of the highest grade available.

Ferrous chloride (FeCl₂, 99%), Ferrous chloride tetrahydrate (FeCl₂.4H₂O, 99%), ferrous sulfate heptahydrate (FeSO₄.7H₂O, 99%), ferric chloride hexahydrate (FeCl₃.6H₂O, 99%), sodium borohydride (NaBH₄, 99%) and hydrochloric acid (HCl, 99%) were purchased from Sigma-Aldrich. Ethanol (C₂H₅OH, 99%), sodium hydroxide (NaOH, 33%), hydrazine (N₂H₄, 99%) and ammonium hydroxide (NH₄OH, 99%) were procured from Pharos company (Egypt). Silica gel (SiO₂, 99%) was purchased from Fluka in Switzerland and starch (99%) was procured from Nice Chemicals in India. Potassium dichromate (K₂Cr₂O₇, 97%) and humic acid (C₉H₉NO₆, 99%) were obtained from Sigma-Aldrich. Zinc chloride (ZnCl₂, 97%), magnesium chloride hexahydrate (MgCl₂.6H₂O, 99%), sodium nitrate (NaNO₃, 98%), copper chloride dihydrate (CuCl₂.2H₂O, 99%), sodium sulfate (Na₂SO₄, 99%), sodium phosphate dodecahydrate (Na₃PO₄.12H₂O, 99%) and sodium carbonate dehydrate (Na₂CO₃.10H₂O, 98%) were purchased from Loba Chemie (India). All chemicals were of high purity and used directly without any modifications.