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连续施用城镇达标生活污泥对苹果和果园土壤重金属污染风险的影响
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作者 白家云 许俊香 +6 位作者 孙钦平 姚海 杨英杰 和亮 高始涛 熊建军 刘艳鹏 《河南农业科学》 北大核心 2024年第11期83-92,共10页
为探究连续施用生活污泥对苹果和果园土壤重金属污染风险的影响,通过田间试验,设置常规施肥(T1)、中量施用污泥(T2)、高量施用污泥(T3)和低量施用污泥(T4)4个处理,分析污泥不同用量、不同施用年限苹果和土壤的重金属污染风险。结果表明... 为探究连续施用生活污泥对苹果和果园土壤重金属污染风险的影响,通过田间试验,设置常规施肥(T1)、中量施用污泥(T2)、高量施用污泥(T3)和低量施用污泥(T4)4个处理,分析污泥不同用量、不同施用年限苹果和土壤的重金属污染风险。结果表明,苹果中的Cd、Cr、Pb、Hg和As含量均未超过限量标准。施用污泥3 a,土壤重金属的单因子污染指数分别低于警戒线71.98%~75.98%、66.57%~69.90%、92.32%~94.01%、78.59%~90.40%、17.22%~23.29%;内梅罗综合污染指数和潜在生态风险指数分别低于警戒线9.51%~16.08%、82.50%~86.75%。施用污泥3 a,Hg和As含量的单因子污染指数分别比背景值增长29.52倍、83.14%。T2—T4处理的潜在生态风险指数与背景值相比升高78.38%、95.69%、48.18%,Hg的潜在生态风险贡献率从11.00%~17.02%增长至19.32%~33.70%,As从21.55%~24.61%增长至31.54%~39.17%。基于Cd和Hg计算的污泥安全施用年限较短,为32.30~116.31、36.07~129.91 a。综上,连续施用生活污泥3 a,苹果果实和土壤均处于无污染状态;随施污泥年限增加,土壤单因子污染指数(Hg和As)、综合污染指数和潜在生态风险均升高,其中Hg和As是主要贡献因子。基于施肥量计算的污泥安全施用年限,Cd和Hg是最主要的限制性元素。污泥合理利用不会引起土壤重金属污染。 展开更多
关键词 苹果 果园土壤 城镇达标生活污泥 重金属污染风险
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有机无机肥配施对稻-油系统中重金属污染风险和产品质量的影响 被引量:18
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作者 鲁洪娟 孔文杰 +1 位作者 张晓玲 倪吾钟 《浙江大学学报(农业与生命科学版)》 CAS CSCD 北大核心 2009年第1期111-118,共8页
通过田间试验研究有机无机肥配合施用对水稻—油菜轮作体系重金属污染风险和农产品质量的影响.试验设置化肥(T1)、化肥+低量有机肥(T2)、化肥+中量有机肥(T3)、化肥+高量有机肥(T4)4个处理,各处理氮磷钾用量相等,重复4次.结果表明,不同... 通过田间试验研究有机无机肥配合施用对水稻—油菜轮作体系重金属污染风险和农产品质量的影响.试验设置化肥(T1)、化肥+低量有机肥(T2)、化肥+中量有机肥(T3)、化肥+高量有机肥(T4)4个处理,各处理氮磷钾用量相等,重复4次.结果表明,不同施肥处理水稻和油菜地上部生物量及籽粒产量没有显著差异(油菜茎杆除外).糙米Cd含量随有机肥配施比例提高而增加,中量和高量有机肥与化肥配施处理(T3和T4)糙米Cd含量已接近谷类污染的临界值0.2mg?kg-1,存在一定的健康风险.根据油菜籽粒的出油率35%折算(其他部分为菜籽饼)和国家饲料卫生标准对饲料中Cd、Pb的卫生要求,油菜籽粒的Cd、Pb含量均在安全范围内.化肥处理(T1)会引起土壤-作物系统Cu和Zn的亏缺,施用有机肥(T2、T3、T4)会导致Cd的积累,全部处理均有Pb的积累.适量有机肥与化肥配合施用既可在一定程度上防止微量营养元素(Cu和Zn)的亏缺,也可有效地控制农田生态系统重金属的污染,是农业可持续发展的有效途径之一. 展开更多
关键词 商品有机肥 配合施肥 水稻-油菜轮作体系 重金属污染风险 产品质量
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巢湖塘西河河口湿地重金属污染风险不确定性评价 被引量:11
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作者 李如忠 石勇 《环境科学研究》 EI CAS CSCD 北大核心 2009年第10期1156-1163,共8页
基于污染风险评价系统多种不确定性共存的特点,采用盲数描述和表征重金属污染风险评价模型的各项参数,在对采自巢湖塘西河河口湿地24个表层沉积物柱状样中Cu,Zn,Pb,Cd和Cr等指标分析测试的基础上,采用Matlab工具软件编制的潜在生态风险... 基于污染风险评价系统多种不确定性共存的特点,采用盲数描述和表征重金属污染风险评价模型的各项参数,在对采自巢湖塘西河河口湿地24个表层沉积物柱状样中Cu,Zn,Pb,Cd和Cr等指标分析测试的基础上,采用Matlab工具软件编制的潜在生态风险指数盲数评价模型程序,对巢湖塘西河河口湿地重金属污染风险进行定量评估.结果表明:巢湖塘西河河口湿地处于中等污染至较高污染状态,其相应的可信度分别为0.589和0.411;潜在生态风险等级属较低至中等水平,其相应可信度分别为0.755和0.245.5种重金属污染程度排序依次为Cu>Cd>Zn>Pb>Cr;潜在生态风险水平排序依次为Cd>Cu>Pb>Cr>Zn. 展开更多
关键词 不确定性评价 重金属污染风险 塘西河 盲数 可信度
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基于层次分析法的耕地土壤重金属污染风险区域划分 被引量:13
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作者 彭丽梅 赵理 +1 位作者 周悟 胡月明 《河南理工大学学报(自然科学版)》 CAS 北大核心 2020年第5期61-67,共7页
随着城市化、工业化和农业现代化进程加快,过量的重金属进入土壤,导致耕地土壤质量下降、土壤生产力和粮食安全水平降低,对人类健康和区域生态系统平衡产生了严重的威胁。科学评价耕地土壤重金属污染现状并对其进行污染风险区域划分,对... 随着城市化、工业化和农业现代化进程加快,过量的重金属进入土壤,导致耕地土壤质量下降、土壤生产力和粮食安全水平降低,对人类健康和区域生态系统平衡产生了严重的威胁。科学评价耕地土壤重金属污染现状并对其进行污染风险区域划分,对当地社会经济发展,加快生态文明建设有重要意义。本文运用层次分析法,选取有机质含量、土壤酸碱度、海拔、坡度、道路距离、河流距离、工厂距离和居民地距离因子,构成评价指标体系,对广州市从化区耕地土壤5种重金属(Cd,Hg,As,Pb,Cr)进行污染风险区域划分。结果显示,从化区土壤重金属风险以Cd和Hg为主,主要分布在鳌头镇东北部、太平镇南部、温泉镇东部及吕田镇中部,Pb与As风险水平相近,Cr对耕地污染风险最轻,各重金属风险划分结果Kappa系数均大于0.4,表明分类质量较好,精度符合要求。 展开更多
关键词 耕地土壤 重金属污染风险 区域划分 层次分析法 广州市从化区
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一种设施菜地土壤重金属污染风险评价模型的建立
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《蔬菜》 2021年第2期25-25,共1页
为解决土壤重金属污染的不确定性和模糊性、传统方法评价结果失真度高、新标准下我国设施菜地土壤重金属风险状况未知等问题,中国农业大学资源与环境学院乔玉辉教授团队在新出台的土壤环境质量评价标准下,利用改进的物元可拓模型对我国... 为解决土壤重金属污染的不确定性和模糊性、传统方法评价结果失真度高、新标准下我国设施菜地土壤重金属风险状况未知等问题,中国农业大学资源与环境学院乔玉辉教授团队在新出台的土壤环境质量评价标准下,利用改进的物元可拓模型对我国设施菜地土壤重金属污染风险状况进行评价,并将结果与传统评价方法进行对比分析。结果表明:(1)我国绝大多数设施菜地重金属含量处于安全水平,仅部分样点超标。 展开更多
关键词 重金属污染风险 设施菜地土壤 土壤环境质量评价 重金属风险 物元可拓模型 中国农业大学 传统评价方法 不确定性
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北京市城市污泥土地利用的重金属污染风险评估 被引量:8
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作者 李雅嫔 杨军 +3 位作者 雷梅 陈同斌 郑国砥 刘树庆 《中国给水排水》 CAS CSCD 北大核心 2015年第9期117-120,共4页
重金属污染风险是限制城市污泥土地利用的重要因素,通过调查北京市污泥施用区土壤、作物的重金属含量,评估北京市的城市污泥农用重金属污染风险,筛选北京市城市污泥土地利用优先控制重金属。与对照区相比,北京市城市污泥施用区表层土壤... 重金属污染风险是限制城市污泥土地利用的重要因素,通过调查北京市污泥施用区土壤、作物的重金属含量,评估北京市的城市污泥农用重金属污染风险,筛选北京市城市污泥土地利用优先控制重金属。与对照区相比,北京市城市污泥施用区表层土壤的Hg、Zn和Cu含量分别增加3 731%、86.3%和63.0%,累积趋势较明显。污泥施用区小麦籽粒的Zn含量显著高于对照区,As、Cd、Cr、Cu、Hg、Ni、Pb含量与对照区小麦籽粒的差异并不显著;污泥施用区小麦籽粒的Cu超标率为18.2%,高于对照区的。结合土壤重金属累积特征以及小麦籽粒重金属含量情况,北京市城市污泥土地利用Cu污染风险较大,优先控制的重金属是Cu,其次为Hg。 展开更多
关键词 城市污泥 土地利用 重金属污染风险
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有机无机肥配施对蔬菜轮作系统重金属污染和产品质量的影响 被引量:22
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作者 孔文杰 《植物营养与肥料学报》 CAS CSCD 北大核心 2011年第4期977-984,共8页
采用田间试验方法,研究了等量氮、磷、钾条件下,单施化肥和禽畜商品有机肥与化肥配合施用对番茄-萝卜-青菜轮作系统中的重金属污染和农产品质量的影响。结果表明,中、低量有机肥与化肥配合施用(T3和T2)使蔬菜作物轮作试验中第一季作物... 采用田间试验方法,研究了等量氮、磷、钾条件下,单施化肥和禽畜商品有机肥与化肥配合施用对番茄-萝卜-青菜轮作系统中的重金属污染和农产品质量的影响。结果表明,中、低量有机肥与化肥配合施用(T3和T2)使蔬菜作物轮作试验中第一季作物番茄的果实产量显著降低,但无机有机肥配施处理使后续作物萝卜和青菜的产量高于单施化肥处理。不同施肥处理番茄果实和青菜地上部的重金属含量和积累量没有显著差异,低量和中量有机肥与化肥配施处理(T2和T3)萝卜肉质根铅含量和所有有机无机肥配施处理(T2、T3和T4)的铅积累量显著低于单施化肥处理。各处理蔬菜可食部分的镉、铅含量均低于食品中污染物限量标准(GB18406.1—2001)。单施化肥会引起铜的亏缺,配施商品有机肥可有效地减少土壤中铅的积累。因此适量有机肥与化肥配合施用可在一定程度上防止铜和锌等微量营养元素的亏缺,也可有效地降低重金属铅、镉的污染。 展开更多
关键词 商品有机肥 配合施肥 番茄-萝卜-青菜轮作系统 重金属污染风险 产品质量
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伊河流域栾川-嵩县段土壤重金属污染调查及风险评估 被引量:3
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作者 张军正 黄杨 +3 位作者 吴明明 逯静静 申扎根 陈震 《绿色科技》 2023年第16期194-197,共4页
为调查并评价伊河流域(栾川-嵩县段)土壤重金属元素污染状况,分别采用单因子指数法、综合因子指数法、潜在生态风险指数法对伊河流域(栾川-嵩县段)土壤重金属元素污染状况进行了评价。结果表明:除Cr元素外,栾川-嵩县段土壤中其他重金属... 为调查并评价伊河流域(栾川-嵩县段)土壤重金属元素污染状况,分别采用单因子指数法、综合因子指数法、潜在生态风险指数法对伊河流域(栾川-嵩县段)土壤重金属元素污染状况进行了评价。结果表明:除Cr元素外,栾川-嵩县段土壤中其他重金属元素特定pH值条件下,均超出风险筛选值点位;单因子污染指数评价结果表明,Cd元素对区域内土壤环境污染所产生影响最大;综合污染指数评价结果显示,调查区域范围内整体呈“轻度污染”表现;生态风险指数评价结果则表明,区域范围内土壤中As、Cr、Pb元素属“轻微危害”水平,Cd处于“很强危害”水平,Hg则处于“极强危害”水平。为此,提出了总体来看,伊河流域(栾川-嵩县段)土壤重金属元素污染等级处于可控范围,针对部分含量较高且危害程度较严重的金属元素,应及时开展专项治理。 展开更多
关键词 土壤重金属污染:污染风险评估 综合污染指数
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连霍高速郑商段路旁土壤重金属积累及潜在风险 被引量:25
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作者 马建华 谷蕾 李文军 《环境科学》 EI CAS CSCD 北大核心 2009年第3期894-899,共6页
以连霍高速郑商段不同通车时间的湾刘(通车11 a)和小王庄断面(通车4 a)为研究对象,根据距离公路远近不同布设土壤采样点,用原子吸收分光光度法测定土壤Cd、Cu、Pb、Zn、Ni和Cr含量.在计算表层土壤重金属积累速率和通量的基础上,探... 以连霍高速郑商段不同通车时间的湾刘(通车11 a)和小王庄断面(通车4 a)为研究对象,根据距离公路远近不同布设土壤采样点,用原子吸收分光光度法测定土壤Cd、Cu、Pb、Zn、Ni和Cr含量.在计算表层土壤重金属积累速率和通量的基础上,探讨了路旁土壤重金属的分布特征、积累状况及潜在污染风险.结果表明,Cu、Pb和Cd是典型的交通源重金属,其含量在公路两侧随距离的增加呈先增加后减少的趋势,含量峰值出现在离路基25~50 m之间.湾刘断面土壤Pb、Cd、Cu的平均含量分别为14.52、1.32、73.54 mg.kg-1,小王庄断面分别为12.41、0.98、43.64 mg.kg-1.大部分样点Pb、Cu和Cd的积累速率和通量为正值,且Cu〉Pb〉Cd,小王庄断面大于湾刘断面.2个断面土壤Cd已经发生污染;Cu的潜在污染风险在百年时间尺度之内,大部分样点在未来5~30 a中可能发生污染,潜在风险大;Pb的潜在污染风险都在千年尺度以上,潜在风险极小. 展开更多
关键词 连霍高速 路旁土壤 重金属积累 重金属潜在污染风险
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Pollution status and potential ecological risk assessment in the surface sediments of the Yellow River estuary 被引量:3
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作者 张亚南 贺青 +1 位作者 暨卫东 张琦 《Marine Science Bulletin》 CAS 2015年第1期61-70,共10页
Based on the "Project 908" survey data in 2006--2007 on surface sediments of the sea area adjacent to the Yellow River estuary, the research was conducted on the concentration distribution characteristics of heavy m... Based on the "Project 908" survey data in 2006--2007 on surface sediments of the sea area adjacent to the Yellow River estuary, the research was conducted on the concentration distribution characteristics of heavy metals in surface sediments of the estuary, which show that the mean contents of seven heavy metals (Cu, Pb, Zn, Cd, Cr, Hg, As) in the Yellow River estuary and its surrounding areas all comply with the Level-I of National Marine Sediments Quality Standard of China. Statistically significant correlation between the elements Cu-Cd, Pb-Cr and Cr-As in sediments indicates that the two heavy metals in each group may respectively have similar geochemical properties and sources. By using the Potential Ecological Risk Index (PERI) proposed by Hakanson, the assessment shows that the potential ecological risks in the estuary surface sediments are mainly attributed to Cd and Hg. The biological toxicity effects are assessed with the biological effects of concentration method, resulting in a conclusion that the adverse effects of As on organisms in the estuary marine environment occasionally occur, in contrast, Cu, Pb, Zn, Cd, Cr and Hg will not generate adverse biological effects on a short and medium time scale. 展开更多
关键词 Yellow River estuary heavy metals pollution risk assessment
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Source analysis and ecological risk assessment for heavy metals in the sediments of the Yangshan Deepwater Harbor in autumn and winter 被引量:1
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作者 叶然 秦铭俐 +2 位作者 崔永平 顾红伟 叶仙森 《Marine Science Bulletin》 CAS 2014年第1期59-72,共14页
Temporal and spatial variations of concentrations of heavy metals including mercury (Hg), zinc (Zn), lead (Pb), arsenic (As), copper (Cu), and cadmium (Cd) in the sediments of the Yangshan Deepwater Harbor... Temporal and spatial variations of concentrations of heavy metals including mercury (Hg), zinc (Zn), lead (Pb), arsenic (As), copper (Cu), and cadmium (Cd) in the sediments of the Yangshan Deepwater Harbor were determined based on 6 cruises in autumn and winter, respectively, from 2010 to 2013. The results demonstrated that the overall concentrations of heavy metals were low and distributed in uniform patterns. The concentrations of Hg, Zn, Pb, and Cd in autumn were significantly higher than those in winter with small fluctuations for As and Cu in terms of seasonal variations. Results of factor analysis showed that Pb, Cd, and Zn were derived from inland industrial and shipping discharges as well as the degradation of organic pollutants in marine environment. While agricultural pollutions, cargo shifting and construction debris from reclamation projects contributed to the sources of Cu, As, and Hg. Ecological risk assessment by Mean Sediment Quality Guideline Quotient (SQG-Q) revealed that the degree for eco-risk of the sediments was low-and-moderate in autumn, higher than that in winter. Hg and Cu were the dominant eco-risk factors. The results of Index of geoaccumulation (Igeo) showed that the whole sites of the sea area were barely influenced by Hg, As, Zn, and Pb, and the extents of Cd and Cu contaminations were in low grade. Contamination degree of all the six heavy metals could be ranked as the following: Cd〉Pb〉Zn〉Hg〉As. According to the results of integrated score of factor analysis, the contamination degree for heavy metals in sediments of the Yangshan Deepwater Harbor was low, despite sites No.5, No.4 and No.3, which were heavily contaminated compared with others. 展开更多
关键词 Yangshan Deepwater Harbor SEDIMENT heavy metals ecological risk contamination grade
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Soil Contamination by Heavy Metals and Evaluations on Potential Ecological Risks in an Antimony Mine 被引量:1
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作者 张伟 葛建团 《Agricultural Science & Technology》 CAS 2015年第3期600-602,共3页
To study the status of soil quality in an antimony mine, soil samples were collected from different regions and the elements' contents of Sb, Cd, Cr, Cu, Zn, Pb, Hg, Ni and As were analyzed using single factor pollut... To study the status of soil quality in an antimony mine, soil samples were collected from different regions and the elements' contents of Sb, Cd, Cr, Cu, Zn, Pb, Hg, Ni and As were analyzed using single factor pollution index, Nemerow index and potential ecological risk index. The heavy metal contamination of soils were evaluated. The results showed that Nemerow index for each sampled point was less than 0.7, meaning a clean state. When potential ecological risk assessment was conducted, the sampled point was less than 150, belonging to light pollution. 展开更多
关键词 Heavy metals Contamination degree Potential ecological risks An antimony mine
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Pollution hazards of heavy metals in sewage sludge from four wastewater treatment plants in Nanchang, China 被引量:14
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作者 Ting YANG Hua-jun HUANG Fa-ying LAI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第10期2249-2259,共11页
The pollution hazards of heavy metals were investigated in sewage sludge collected from four wastewater treatment plantsin Nanchang City,China,including Honggutan(HGT),Chaoyang(CY),Qingshanhu(QSH)and Xianghu(XH).Conta... The pollution hazards of heavy metals were investigated in sewage sludge collected from four wastewater treatment plantsin Nanchang City,China,including Honggutan(HGT),Chaoyang(CY),Qingshanhu(QSH)and Xianghu(XH).Contamination/riskcharacteristics of heavy metals(Cu,Pb,Zn,Cd,Cr and Ni)were evaluated based on their leachable content,total content andchemical speciation.The sewage sludge from QSH contained higher total contents of heavy metals(except Pb)than those from HGT,XH and CY.The total contents of Cd and Ni were mostly beyond standard.Cu,Cr and Pb were predominantly present in potentialeffect and stable fractions.Zn and Ni showed higher bioavailability.Cd presented roughly uniform distribution into four fractions.The leaching contents of heavy metals almost exceeded the threshold values,especially for Zn and Ni.The potential ecological riskindexes of heavy metals in sewage sludge were4263.34?7480.26,indicating very high risks.Cd contamination is the major concern. 展开更多
关键词 sewage sludge heavy metal contamination degree environment risk
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Distribution and transformation behaviors of heavy metals during liquefaction process of sewage sludge in ethanol-water mixed solvents 被引量:4
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作者 PAN Zi-qian HUANG Hua-jun +4 位作者 ZHOU Chun-fei LAI Fa-ying HE Xiao-wu XIONG Jiang-bo XIAO Xiao-feng 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第10期2771-2784,共14页
Liquefaction of sewage sludge(SS)in ethanol-water cosolvents is a promising process for the preparation of bio-oil/biochar products.Effect of the combined use of ethanol and water on the distribution/transformation be... Liquefaction of sewage sludge(SS)in ethanol-water cosolvents is a promising process for the preparation of bio-oil/biochar products.Effect of the combined use of ethanol and water on the distribution/transformation behaviors of heavy metals(HMs)contained in raw SS is a key issue on the safety and cleanness of above liquefaction process,which is explored in this study.The results show that pure ethanol facilitates the migration of HMs into biochar products.Pure water yields lower percentages of HMs in mobile/bioavailable speciation.Compared with sole solvent treatment,ethanol-water cosolvent causes a random/average effect on the distribution/transformation behaviors of HMs.After liquefaction of SS in pure water,the contamination degree of HMs is mitigated from high level(25.8(contamination factor))in raw SS to considerable grade(13.4)in biochar and the ecological risk is mitigated from moderate risk(164.5(risk index))to low risk(78.8).Liquefaction of SS in pure ethanol makes no difference to the pollution characteristics of HMs.The combined use of ethanol and water presents similar immobilization effects on HMs to pure water treatment.The contamination factor and risk index of HMs in biochars obtained in ethanol-water cosolvent treatment are 13.1-14.6(considerable grade)and 79.3-101.0(low risk),respectively.In order to further control the pollution of HMs,it is preferentially suggested to improve the liquefaction process of SS in ethanol-water mixed solvents by introducing conventional lignocellulosic/algal biomass,also known as co-liquefaction treatment. 展开更多
关键词 sewage sludge LIQUEFACTION ethanol-water cosolvent heavy metals contamination degree ecological risk
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Potential Ecological Risks of Heavy Metals in Soils of Shandong Peninsula Blue Economic Zone 被引量:2
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作者 DAI Jie-rui 《Agricultural Science & Technology》 CAS 2019年第1期42-48,共7页
In this research, soil samples were collected from Shandong Peninsula Blue Economic Zone to investigate heavy metal pollutions in this region and to evaluate the potential ecological risks of heavy metal pollutants ba... In this research, soil samples were collected from Shandong Peninsula Blue Economic Zone to investigate heavy metal pollutions in this region and to evaluate the potential ecological risks of heavy metal pollutants based on Hakanson Potential Ecological Risk Indexes. According to the results, Hg was the primary heavy metal pollutant in Blue Economic Zone, followed by Cd, Cu, and Pb as prevalent pollutants. Heavy metals ranked in order of their pollution degrees are: Hg>Cd>Cu>Pb>Zn>Cr>As;the potential ecological risks of heavy metals follow the order of Hg>Cd>As>Pb>Cu>Cr>Zn. Heavy metal pollutions did exist in this region to a certain extent, and the percentage of potential ecological risk in “strong” and “severe” degree reached up to 13.75%. This composite risk characteristic was subject to the restriction of Hg and Cd mainly distributed in Laizhou-Zhaoyuan- Yantai, Muping-Rushan Goldmine, and other densely-populated regions, threatening the safety production of crops. The combined effects of geological background and human activities, e.g. gold mining and domestic pollutants, were the main causes of high potential ecological risks of heavy metals in local environment. 展开更多
关键词 SOIL Heavy metal pollution Potential ecological risk Shandong Peninsula Blue Economic Zone
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Spatial distribution,sources and ecological risk assessment of heavy metals in Shenjia River watershed of the Three Gorges Reservoir Area 被引量:10
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作者 WANG Yong-yan WEN An-bang +2 位作者 GUO Jin SHI Zhong-lin YAN Dong-chun 《Journal of Mountain Science》 SCIE CSCD 2017年第2期325-335,共11页
Surface soil/sediment samples were collected from the Water-Level Fluctuation Zone(WLFZ), cultivated land and forest land at 50 different grid points from Shenjia watershed, the Three Gorges Reservoir area in August 2... Surface soil/sediment samples were collected from the Water-Level Fluctuation Zone(WLFZ), cultivated land and forest land at 50 different grid points from Shenjia watershed, the Three Gorges Reservoir area in August 2013. The spatial distribution, sources and ecological risk assessment for Arsenic(As), Cadmium(Cd),Chromium(Cr), Copper(Cu), Nickel(Ni), Lead(Pb)and Zinc(Zn) were analyzed in this study. The results showed all tested metals had similar distribution patterns except Ni and Cr, with areas of high concentrations distributed in the southwest(WLFZ and watershed outlet) of the study area. Ni and Cr,which were highly positively correlated and present in high concentrations, were primarily distributed in the south and middle zones of the study area. Lower concentration areas of all metals were uniformly distributed west of the high-elevation zones and forest land. Factor analysis(FA) and factor analysismultiple linear regression(FA-MLR) showed that the major sources of Cd were fertilizer and traffic sources,which together accounted for 87% of Cd. As, Zn and Cu levels were primarily supplied by industrial and domestic sources, accounting for 76% of As, 75% of Cu and 67% of Zn. Surface soils/sediments of the study watershed contaminated by Cd represent a high ecological risk, whereas other metals represent low ecological risks. The potential ecological risk index(PERI) analysis indicated that it had a low(widerange) ecological risk and a moderate(small-range)ecological risk primarily distributed in the outlet of the study watershed. Fertilizers and traffic are the primary sources of Cd pollution, which should be more closely controlled for the purposes of water quality and ecological conservation. 展开更多
关键词 Spatial distribution Ecological risk assessment Water-level fluctuation zone Heavy metals Three Gorges Reservoir
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Ecological Risk Assessment of Combined Pollution of Heavy Metals and Pesticides in Urban Soils
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作者 Kang An Xiaoping Xie 《International English Education Research》 2014年第7期104-108,共5页
Urban soil is the main component of urban ecological systems and the key risk receptor from urbanization. Heavy metal and green pesticide pollutions in urban soils have been widely reported with the expanding of urban... Urban soil is the main component of urban ecological systems and the key risk receptor from urbanization. Heavy metal and green pesticide pollutions in urban soils have been widely reported with the expanding of urbanization. Since urban soil pollution comes from various resources, application of integrated thinking and methods is needed in ecological risk assessment of urban soil pollution. This paper synthetically reviewed the combined pollution of heavy metals and pesticide, and ecological risk assessment, and then proposed some research trends and areas in the future that are required to carry out intensively according to the present situation of environmental pollution and international research fronts. 展开更多
关键词 Urban soil Heavy metal PESTICIDE Combined pollution Integrated eco-risk assessment
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Risk Assessment of Heavy Metal Pollution in Sediments of the Fenghe River by the Fuzzy Synthetic Evaluation Model and Multivariate Statistical Methods 被引量:13
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作者 YANG Yang ZHOU Zhengchao +2 位作者 BAI Yanying CAI Yimin CHEN Weiping 《Pedosphere》 SCIE CAS CSCD 2016年第3期326-334,共9页
Concentrations of heavy metals in 74 sediment samples from the Fenghe River, which originates from the north of the Qinling Mountains and flows through Xi'an, Shaanxi Province, China, were characterized by employi... Concentrations of heavy metals in 74 sediment samples from the Fenghe River, which originates from the north of the Qinling Mountains and flows through Xi'an, Shaanxi Province, China, were characterized by employing geographic information system(GIS)mapping, fuzzy synthetic assessment, and multivariate statistical analysis to determine the enrichment characteristics of heavy metals as well as their potential risks of pollution to sediments. Al, Cd, and Co were the major pollutants, with a high enrichment factor(EF) value. Heavy metal concentrations from samples near the paper plant were maintained at a high level. Significant enrichment of Al, Ba, Cr, Ni, Pb, and Co was found in the midstream and downstream, while high concentration of Cu occurred in the headwater stream. Based on the cluster and principal component analyses, sediment metals mainly came from the paper plants, agronomic practices, natural sources, and tourism, with a contribution of 51.59%, 23.01%, 14.21%, and 9.88%, respectively. Sediment pollution assessment explored using fuzzy theory based on the entropy method and toxicity coefficient showed that 26, 32, and 11 sites fell into Class III(slightly polluted), Class IV(moderately polluted), and Class V(heavily polluted), respectively, and their scores of membership degree in the polluted level were on the rise, suggesting a relatively high degree of sediment metal pollution in the study area. Closely related to the excessive industrial and agricultural applications, metal pollution in sediment is necessary to be addressed in the Fenghe River. 展开更多
关键词 fuzzy theory risk analysis river ecosystem sediment pollution spatial analysis
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Identifying sources and hazardous risks of heavy metals in topsoils of rapidly urbanizing East China 被引量:22
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作者 刘洋 马宗伟 +1 位作者 吕建树 毕军 《Journal of Geographical Sciences》 SCIE CSCD 2016年第6期735-749,共15页
With rapid economic and social development, soil contamination arising from heavy metals has become a serious problem in many parts of China. We collected a total of 445 samples (0-20 cm) at the nodes of a 2 kmx2 km... With rapid economic and social development, soil contamination arising from heavy metals has become a serious problem in many parts of China. We collected a total of 445 samples (0-20 cm) at the nodes of a 2 kmx2 km grid in surface soils of Rizhao city, and analyzed sources and risk pattern of 10 heavy metals (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb and Zn). The combination of Multivariate statistics analysis and Geostatistical methods was applied to identify the sources and hazardous risk of heavy metals in soils. The result indicated that Cr, Ni, Co, Mn, Cu, and As were mainly controlled by parent materials and came from natural sources. Cd and Hg originated from anthropogenic sources. Pb and Zn, belonging to different groups in multivariate analysis, were associated with joint effect of parent materials and human inputs. Ordinary Kriging and Indicator Kriging suggested that single element and elements association from the same principal components had similar spatial distribution. Through comprehensive assessment on all elements, we also found the high risk areas were located in the populated urban areas and western study area, which could be attributed to the higher geological background in the western part and strong human interference in the eastern part. 展开更多
关键词 heavy metals in soils hazardous risk multivariate analysis Indicator Kriging Rizhao
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