Toxicity Assessment Of Soil Amended With Tannery Sludge, Trivalent Chromium And Hexavalent Chromium, Using Wheat, Oat And Sorghum Plants

摘要

This work assessed the effect of soil amended with tannery sludge (0, 500, 1000, 2000, 4000 and 8000mg Cr kg~(-1) soil), Cr~(3+) as CrCl_3· 6H_2O (0, 100, 250, 500, 1000 and 2000mgCr kg~(-1) soil), and Cr~(6+) as K_2Cr_2O_7 (0,25, 50, 100, 200 and 500mgCr kg~(-1) soil) on wheat, oat and sorghum plants.rnSeed germination, seedling growth (root and shoot) and Cr accumulation in dry tissue were measured. Toxicological parameters; medium effective concentration, no observed adverse effect concentration and low observed adverse effect concentration were determined. Root growth was the most sensitive assessment of Cr toxicity (P<0.05). There was a significant correlation (P< 0.0001) between Cr accumulation in dry tissue and toxic effects on seedling growth. The three Cr sources had different accumulation and mobility patterns; tannery sludge was less toxic for all three plant species, followed by CrCh_3· 6H_2O and K_2Cr_2O_7.