U

ultrafiltration 154, 269 uncertainty range 184 uncharged metal complexes 266 uncoupling between desorption and assimilitation in the gut 227

uptake experiments with Ni and

Zn radioisotopes 268 uptake in plants 330 uptake of zinc in terrestrial plants 328

uptake route to biota 325 urban and road-side soils 84 urban atmosphere 72-73, 76, 8081, 84-85, 364 urban metal flows 4, 50-51 urban soils 50, 61-64, 242, 322,

330, 359 urban soils 242 use categories of copper 31 UV-B radiation 292

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