Simultaneous determination of spinetoram residues in tomato by high performance liquid chromatography combined with QuEChERS method.

A sensitive and simple method for simultaneous analysis of spinetoram residues and its dissipation in tomato were studied. Spinetoram residues were extracted from tomato samples with acetonitrile. The extract was cleaned-up with QuEChERS method by dispersive solid-phase extraction with primary secondary amine sorbent to remove co-extractives, prior to analysis by high performance liquid chromatography coupled with diode array detector (HPLC-DAD).

Metals in water from the River Nile tributaries in Egypt.

The objective of this study was to evaluate the levels of Zn, Cu, Pb, Fe and Cd metals in water samples collected from different tributaries of the Nile River in Egypt. Samples were taken from El-Sarsawia, El-Bagoria, Bahr Shebin canals, in addition to three drainage canal sites El-Embaby, El-Menofi and Miet-Rabiha drain. According to the data, Fe has the highest concentration, followed by Pb, Zn, Cd and Cu.