López-Luna J, González-Chávez M C, Esparza-García F J, Rodríguez-Vázquez R
CINVESTAV-IPN, Departamento de Biotecnología y Bioingeniería, Av. Instituto Politécnico Nacional No 2508, 07360 México, D.F., Mexico.
J Hazard Mater. 2009 Apr 30;163(2-3):829-34. doi: 10.1016/j.jhazmat.2008.07.034. Epub 2008 Jul 15.
This work assessed the effect of soil amended with tannery sludge (0, 500, 1000, 2000, 4000 and 8000 mg Cr kg(-1)soil), Cr(3+) as CrCl(3).6H(2)O (0, 100, 250, 500, 1000 and 2000 mg Cr kg(-1)soil), and Cr(6+) as K(2)Cr(2)O(7) (0, 25, 50, 100, 200 and 500 mg Cr kg(-1)soil) on wheat, oat and sorghum plants. Seed 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 CrCl(3).6H(2)O and K(2)Cr(2)O(7).
本研究评估了用制革污泥（0、500、1000、2000、4000和8000毫克铬/千克土壤）、以六水合氯化铬（CrCl₃·6H₂O）形式存在的三价铬（0、100、250、500、1000和2000毫克铬/千克土壤）以及以重铬酸钾（K₂Cr₂O₇）形式存在的六价铬（0、25、50、100、200和500毫克铬/千克土壤）改良的土壤对小麦、燕麦和高粱植株的影响。测定了种子发芽率、幼苗生长情况（根和芽）以及干组织中的铬积累量。确定了毒理学参数；半数效应浓度、未观察到有害作用浓度和低观察到有害作用浓度。根生长是对铬毒性最敏感的评估指标（P<0.05）。干组织中的铬积累量与对幼苗生长的毒性效应之间存在显著相关性（P<0.0001）。三种铬源具有不同的积累和迁移模式；制革污泥对所有三种植物的毒性较小，其次是六水合氯化铬和重铬酸钾。
