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Concentration of Na, K, Ca and Mg in selected vegetable cultures: spinach (Spinacia oleracea), lettuce (Lactuca sativa) and parsley (Pertoselinum crispum) were analyzed. Only edible parts of the above plants were used. Metal content was determined by inductively coupled plasma optical emission spectrometry (ICP-OES). Thermo Scientific with Echelle optical design and Charge Injection Device (CID) solid statedetector was used. Determined concentrations were within intervals: 18.44 – 85.04, 16.4 – 25.1, 2.97 – ...

A kinetic method for the determination of 2,4-D is proposed. The method is based on the inhibiting effect of 2,4-D on the Mn(II) catalysis of the oxidation of malachite green with potassium periodate. The method was applied for the determination of 2,4-D in soil samples.