PLANT UPTAKE OF SELENIUM ARSENIC AND MOLYBDENUM FROM SOIL TREATED WITH COAL COMBUSTION BY-PRODUCTS

Three coal combustion byproducts, fly ash (FA), scrubber sludge (SS) a nd gypsum (G), added to soil at rates of 0, 20, 40 and 80 g/kg only li mited annual ryegrass (Lolium multiflorum) growth at the 80 g/kg rate. FA and SS increased selenium (Se), arsenic (As) and molybdenum (Mo) c oncentrations in ryegrass but only Se from FA would present a potentia l food chain risk. G did not significantly increase ryegrass concentra tions of Se, As and Mo and should not produce elevated trace element l evels in plant material or the environment when added to sail at high rates.