**4.6 Effect of matrix ions**

The effect of matrix ions in the real samples on the simultaneous separation and preconcentration of heavy metals are generally tested. The model samples (25 mL) containing 2 μg of cadmium, and zinc, 10 μg of copper, cobalt, iron, manganese, nickel, 20 μg of chrome and lead ions. The known concentrations of matrix ions are prepared and work method is implemented to these prepared model samples. The tolerable levels of the matrix ions are given.
