Chemistry of King Abdallah Canal Water in the Jordan Valley. II. Effect of Water pH on the Stability of Dimethoate PDF

Keywords

Gas liquid chromatography, treated canal water, phosphoric acid

Abstract

Chemical analysis of King Abdallah Canal (KAC) water in the Jordan Valley (JY) was conducted for collected samples from ten different sites along the KAC. Water analysis include parameters such as pH, electrical conductivity (E.C.), and major anions and cations. The chemical stability of dimethoate was studied at different water pH values. Four different treatments were used to study the stability of dimethoate. These treatments were canal water (pH = 8.44), distilled water, phosphoric acid - treated canal water (pH = 6.00), and propionic acid - treated canal water (ph = 6.00). Spray solutions samples were allowed to stand for 1,4 and 24 hrs before extraction. Gas liquid chromatographic (OLC) method was performed in the determination of dimethoate in water samples. Canal water samples caused the highest % of hydrolysis for dimethoate after 24 hrs from treatment, while losses were much lower in distilled water. Phosphoric acid - treated canal water showed almost negligible % of hydrolysis during 24 hrs, while propionic acid - treated canal water was much less efficient compared to distilled water and phosphoric acid - treated canal water.