Dibenzoylmethane

Chitosan (90% deacetylated), acetyl acetone, dibenzoyl methane, monochloroacetic acid, copper(ii) acetate monohydrate, 4-hydroxy benzohydrazide, methanol, acetic acid, methylene blue and sodium hydroxide were purchased from Sigma Aldrich and SRL India and used as supplied without further purification.

The aluminum cans were obtained from commercial shops (Mansoura, Egypt). Isatoic anhydride, dibenzoylmethane, 4-amino-2-hydroxy benzoic acid, toluene, cadmium(ii) chloride, chloroacetyl chloride, nickel(ii) chloride hexahydrate, ethylenediaminetetraacetic acid tetrasodium salt dihydrate, zinc(ii) chloride, aluminum(iii) chloride hexahydrate, iron(iii) chloride hexahydrate, and lead(ii) chloride were obtained from Sigma-Aldrich. Hydrochloric acid, potassium chloride, sodium hydroxide, mercury(ii) chloride, and copper(ii) chloride dihydrate were purchased from Merck (Germany). The other chemicals were of analytical grade, obtained from Fluka (Switzerland) and were used without further purification unless otherwise stated. In addition, all aqueous solutions in this work were prepared by using doubly distilled water (resistance: 18.2 MΩ at 25 °C). It is worth mentioning that all glassware was rinsed in concentrated nitric acid solution (1% (v/v)) and washed with doubly distilled water before use. For analytical applications, the cucumber, lettuce leaves, and wastewater samples were collected from different agricultural locations in Samanoud (El-Gharbia).