造纸废水灌溉下芦苇体内铜化学形态研究

发布时间：2018-08-16 17:09

【摘要】：为探究造纸废水灌溉下芦苇体内铜化学形态的分布,采用模拟湿地试验,研究了不同造纸废水浓度灌溉下芦苇各部位(根、茎、叶、穗)中铜化学形态(乙醇、水、氯化钠、醋酸、盐酸提取态)分布特征以及芦苇生长期(发芽期、展叶期、快速生长期、抽穗期、成熟期)对铜化学形态影响规律。结果表明:芦苇对铜元素含量受废水浓度影响,受芦苇生长时期的影响。废水浓度为300mg·L~(-1)时,芦苇体内铜含量最高(12.65mg·kg~(-1)),主要分布在根部(10.67mg·kg~(-1)),茎中含量最低(6.02mg·kg~(-1));展叶期内铜含量最高(14.52mg·kg~(-1)),成熟期最低(5.57mg·kg~(-1));芦苇体内铜形态分布受生长期影响较大,且各部位间有较大差异。芦苇体内铜以乙醇(3.43mg·kg~(-1))和水(3.00mg·kg~(-1))提取态为主,其中根部乙醇(32.02%)和水(24.77%)提取态含量最高,而穗中铜HCl提取态含量最高(42.33%)。芦苇生长期中,展叶期HAC提取态所占比例最高(30.83%),乙醇(18.97%)和水(21.54%)提取态次之,其余生长期,铜均以乙醇和水提取态为主,二者合计分别占总量的67.31%,54.34%,52.49%,49.23%;芦苇体内铜主要来源于土壤中弱酸态铜。废水浓度升高提高了芦苇对土壤中铜的吸收率,废水浓度为300mg·L~(-1)时,芦苇对土壤中铜的吸收率最高(9.62%),在展叶期,芦苇对土壤中铜的吸收率最高(3.46%),高于土壤中弱酸态铜总量。造纸废水灌溉促进了芦苇对铜的吸收,在试验的废水浓度灌溉下,芦苇体内铜的各形态含量所占比例变化不大。
[Abstract]:In order to investigate the distribution of copper chemical forms in Reed under paper making wastewater irrigation, the chemical forms of copper (ethanol, water, sodium chloride) in various parts (root, stem, leaf, ear) of Reed irrigated with different wastewater concentrations were studied by simulated wetland experiment. The distribution characteristics of acetic acid and hydrochloric acid extracts and the effects of Reed growth stage (germination stage, leaf spreading stage, rapid growth stage, heading stage and mature stage) on the chemical forms of copper were studied. The results showed that the copper content of Reed was affected by the concentration of wastewater and the growth period of Reed. When the wastewater concentration was 300mg L ~ (-1), the copper content (12.65mg kg ~ (-1),) in Reed was the highest in root (10.67mg kg ~ (-1), stem) (6.02mg kg ~ (-1); was the highest (14.52mg kg ~ (-1),) (5.57mg kg ~ (-1);). And there are great differences among different parts. The main forms of copper in Reed were ethanol (3.43mg kg-1) and water (3.00mg kg-1), among which the content of root ethanol (32.02%) and water (24.77%) was the highest, while the content of Cu HCl in spike was the highest (42.33%). In the growing stage of Reed, the proportion of HAC extract was the highest (30.83%), ethanol (18.97%) and water (21.54%) was the second. In the other growing period, the main forms of copper were ethanol and water. In total, 67.31% of the total amount was 54.34 and 52.490.The copper in the Reed was mainly derived from the weak acid copper in the soil. When the wastewater concentration was 300mg L ~ (-1), the copper absorption rate of Reed was the highest (9.62%), and that of Reed was the highest (3.46%) at leaf extension stage, which was higher than that of weak acid copper in soil. The paper making wastewater irrigation promoted the absorption of copper from Reed. Under the irrigation of wastewater concentration, the proportion of copper species in Reed changed little.
【作者单位】：沈阳农业大学理学院;沈阳农业大学生物科学技术学院;上海环境卫生工程设计院有限公司;上海污染场地修复工程技术研究中心;
【基金】：辽宁省自然基金面上项目(201602660) 国家自然科学基金项目(31470710);国家自然科学基金青年基金项目(31100517) 辽宁省重大科技计划项目(2012212001) 辽宁省优秀人才支持计划项目(LJQ2011070)
【分类号】：X173;X793

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