FIELD: chemistry.
SUBSTANCE: invention relates to the analytical chemistry of the components of the ionic forms of inorganic substances, determined in atmospheric precipitation and surface waters. Extraction-voltammetric method for the determination of zinc, cadmium, lead and copper ions in surface waters involves the extraction of the ionic forms of these metals from the filtrate of surface water with a pH ≤ 2 into the organic phase of the thiopurine salicylate and water splitting molten system. In this case, the molar ratio of 1:1 of thiopurine and salicylic acid is used. Molten mass weighing 1 g is placed in a centrifuge tube with a volume of 10 ml of polyethylene terephthalate. Then add 1 ml of ethanol as a modifier, 4 ml of filtrate of natural water and shake vigorously. After this, the system is stratified into phases – upper aqueous and lower organic. Organic phase is taken in an amount of 5 mcl, applied to the surface of a graphite electrode, placed in 4.00 ml of a 0.1 M solution of hydrochloric acid. Analytical signals are recorded with respect to the silver chloride electrode by stripping voltammetry.
EFFECT: invention makes it possible to reduce the melting point of the molten mass of thiopurine and salicylic acid to 145 °C in determining zinc, cadmium, lead and copper ions in surface waters.
1 cl, 5 tbl, 5 dwg
