期刊文献+
共找到8,450篇文章
< 1 2 250 >
每页显示 20 50 100
Laparoscopic appendectomy for elemental mercury sequestration in the appendix: A case report 预览
1
作者 Gregor Norcic Zan Cebron +2 位作者 Primoz Sever Jan Grosek Ales Tomazic 《世界临床病例杂志》 2019年第9期1038-1042,共5页
BACKGROUND Despite negligible absorption of elemental mercury after acute ingestion, retention in the appendix with subsequent local and systemic complications is possible. We present a case of elemental mercury seque... BACKGROUND Despite negligible absorption of elemental mercury after acute ingestion, retention in the appendix with subsequent local and systemic complications is possible. We present a case of elemental mercury sequestration in the appendix, managed by laparoscopic appendectomy. CASE SUMMARY A 57-year-old Caucasian female was found unconscious following application of long-lasting insulin detemir and ingestion of elemental mercury in a suicidal attempt. Diagnostic investigations revealed several radiopaque collections in the gastrointestinal (GI) tract and elevated mercury levels in the blood. Much of the ingested elemental mercury was eliminated from the GI tract with stools stimulated by several enemas. However, a significant amount of mercury remained sequestrated in the appendix despite all conservative measures. Consequently, following deliberations by an interdisciplinary team of specialists, laparoscopic appendectomy was performed 29 d after the mercury ingestion. The surgery itself and postoperative course were uneventful. CONCLUSION Since conservative measures are often unsuccessful in the management of mercury retention in the appendix, surgery remains a compelling option to prevent possible associated complications. 展开更多
关键词 MERCURY POISONING APPENDIX MERCURY ingestion MERCURY RETENTION APPENDECTOMY Case report
在线阅读 免费下载
三峡水库支流汝溪河河口水体汞的时空变化特征
2
作者 马尉斌 陈秋禹 +3 位作者 尹德良 孙涛 王永敏 王定勇 《环境科学》 EI CAS CSCD 北大核心 2019年第5期2211-2218,共8页
为探究三峡水库水位调度过程中支流河口汞的变化特征,选取三峡库区腹心地带的典型支流汝溪河河口为研究区域,设置4个断面,分别于蓄水期(9~10月)、淹没期(11~12月)、退水期(2~3月)及落干期(5~6月)这4个时期分层采集水样,分析了水样中的总... 为探究三峡水库水位调度过程中支流河口汞的变化特征,选取三峡库区腹心地带的典型支流汝溪河河口为研究区域,设置4个断面,分别于蓄水期(9~10月)、淹没期(11~12月)、退水期(2~3月)及落干期(5~6月)这4个时期分层采集水样,分析了水样中的总汞(THg)、颗粒态汞(PHg)、溶解态汞(DHg)、活性汞(RHg)、总甲基汞(TMeHg)及溶解态甲基汞(DMeHg).结果表明,汝溪河口区域THg和TMeHg的质量浓度与中国其它水库或天然水体相接近.不同深度水体中DHg和TMeHg的质量浓度存在显著性差别,其原因是水体中的DHg和TMeHg可能来源于沉积物的再悬浮.对比同时期不同断面各形态汞质量浓度的差别,发现蓄水期长江干流来水方向的不同将导致河口区域THg和PHg的质量浓度分布不均;退水期河口水体中的颗粒物会吸附并携带大量的PHg,导致水体中THg的质量浓度明显高于其它时期.水位较为稳定的淹没期和落干期TMeHg的质量浓度明显高于其它两个时期,表明稳定的水位可能更有利于水体中甲基汞的积累,而水体的剧烈扰动会明显降低水体中TMeHg的质量浓度. 展开更多
关键词 三峡库区 支流河口 汞形态 分布特征
水产品中汞含量测定方法对比研究
3
作者 王维洁 陈朋 +3 位作者 王萍亚 戴意飞 赵巧灵 罗海军 《食品工业》 CAS 北大核心 2019年第1期156-158,共3页
使用DMA-80直接测汞仪和原子荧光光谱仪对水产品汞含量的测定方法进行对比研究。结果显示,在1.0~20.0ng质量范围内,汞线性良好,DMA-80直接测汞仪方法定量限为0.15μg/kg,原子荧光光谱仪定量限为1.55μg/kg。当加标量为50,100和150μg/kg... 使用DMA-80直接测汞仪和原子荧光光谱仪对水产品汞含量的测定方法进行对比研究。结果显示,在1.0~20.0ng质量范围内,汞线性良好,DMA-80直接测汞仪方法定量限为0.15μg/kg,原子荧光光谱仪定量限为1.55μg/kg。当加标量为50,100和150μg/kg时,DMA-80直接测汞仪回收率为92.0%~98.8%,原子荧光光谱仪回收率为81.6%~95.1%,用统计软件对两种仪器测定的14组样本检测结果进行分析,差异无统计学意义。两种方法的数据准确度均能达到水产品中汞含量的检测要求,DMA-80直接测汞仪在满足实验要求的前提下,所需样品量少,仪操作简单、快捷、准确,试剂无污染,适用于大批量水产品的快速检测。 展开更多
关键词 水产品 DMA-80直接测汞仪
Mercury concentrations in blood and feathers of nestling Bald Eagles in coastal and inland Virginia 预览
4
作者 David E.Kramar Bill Carstensen +1 位作者 Steve Prisley Jim Campbell 《鸟类学研究:英文版》 CSCD 2019年第1期36-42,共7页
Background:Mercury (Hg) and methylmercury are widely considered significant issues for wildlife,and in particular,piscivorous birds due to their widespread availability and neurotoxic properties.Whereas a substantial ... Background:Mercury (Hg) and methylmercury are widely considered significant issues for wildlife,and in particular,piscivorous birds due to their widespread availability and neurotoxic properties.Whereas a substantial number of studies of Hg contamination of Bald Eagles (Haliaeetus leucocephalus) have been conducted throughout the east coast of the United States,little has been done that directly addresses Hg contamination in Bald Eagles in Virginia,particularly the inland population.Methods:We collected blood and feather samples from nestling Bald Eagles in the coastal plain,piedmont,and western regions of Virginia in an effort to determine which areas of the state were more likely to contain populations showing evidence of Hg toxicity.We analyzed the samples for total Hg using a Milestone DMA-80.Results:Samples collected from individuals located in the coastal region exhibited low concentrations of Hg compared to those further inland located on freshwater rivers and reservoirs.Samples collected from the inland population exhibited levels in some areas that are approaching what may be considered to be sub-lethal to avian health (blood:mean 0.324 mg/kg,SE = 0.13,range = 0.06-0.97 mg/kg;feather:mean = 8.433 mg/kg,SE = 0.3,range = 3.811-21.14 mg/kg).Conclusions:Even after accounting for known point-sources of Hg,the inland eagle population in Virginia is susceptible to concentrations of Hg that are significantly higher than their coastal counterparts.Moreover,several locations besides those currently known to be impacted by point-sources are exhibiting concentrations that are approaching a sub-lethal level. 展开更多
关键词 Bald EAGLE Haliaeetus leucocephalus MERCURY Methyl-mercury VIRGINIA
在线阅读 免费下载
抗汞细菌及其生物修复机制的研究现状 预览
5
作者 范桃桃 赵萌萌 +4 位作者 薛林贵 王韶梅 Brown Emaneghemi 何小燕 王霞 《湖南农业科学》 2019年第2期115-119,共5页
重金属汞(Hg)是一种可持久性生物累积的有毒金属,其特有的理化性质给环境和人体带来了巨大危害。总结了汞污染的来源、循环和危害,以及已分离得到的典型抗汞菌株的抗汞特性、汞污染的生物修复机制和抗汞相关基因,包括利用merA基因降解无... 重金属汞(Hg)是一种可持久性生物累积的有毒金属,其特有的理化性质给环境和人体带来了巨大危害。总结了汞污染的来源、循环和危害,以及已分离得到的典型抗汞菌株的抗汞特性、汞污染的生物修复机制和抗汞相关基因,包括利用merA基因降解无机Hg、利用merA、merB基因降解有机Hg、与含硫基团结合、产生胞外分泌物(EPS)吸附Hg等。简述了Hg0的最终消除方法,并对汞污染的生物修复机制进行了展望。 展开更多
关键词 抗汞细菌 生物修复机制 综述
在线阅读 下载PDF
Mercury speciation, bioavailability and risk assessment on soil–rice systems from a watershed impacted by abandoned Hg mine-waste tailings
6
作者 Jian Pang Jialiang Han +4 位作者 Xuelu Fan Chan Li Xian Dong Longchao Liang Zhuo Chen 《中国地球化学学报:英文版》 EI CAS CSCD 2019年第3期391-403,共13页
Mercury(Hg) is a global pollutant and can be accumulated in the food chain, posing exposure risks to humans. In this study, rice plants and corresponding rhizosphere soil samples were collected from a watershed of the... Mercury(Hg) is a global pollutant and can be accumulated in the food chain, posing exposure risks to humans. In this study, rice plants and corresponding rhizosphere soil samples were collected from a watershed of the Wawu River Basin that is heavily impacted by historic Hg mining and retorting activities. Total mercury(THg)and methylmercury(MeHg) in rice grains, as well as other tissues and soil samples, were measured. Five soil Hg fractions, as well as soil parameters, were also determined.The results show that the average concentrations of THg and MeHg in rice grains were 14 ± 7.0 lg kg^-1 and7.2 ± 4.0 lg kg^-1. Soil organic-bound(Hg-o) and strong complex-bound(Hg-s) were the main Hg fractions,accounting for 44% of the total. To estimate the Hg–ligand interaction in the soils, soil-N/Hg(R = 0.451, p \ 0.05),-S/Hg(R = 0.372, p \ 0.1), and-OM/Hg ratio(R = 0.320,p \ 0.5) with MeHgsoil were observed with significant positive correlations, indicating that the formation of Hg–OM, Hg–N–OM or Hg–S–OM complexes could prevent Hg(Ⅱ) from methylation in soils. The significant positive correlations of the-N/Hg ratio,-S/Hg ratio and-OM/Hg ratio with MeHg in rice tissues suggested that Hg methylation and MeHg demethylation occurred throughout the rice paddy ecosystem. The estimated MeHg daily intake(EDI) was 0.075 ± 0.041 lg kg^-1 bw d^-1 and was lower than the RfD level of 0.1 lg kg^-1 bw d^-1 recommended by the US EPA. However, approximately 29% of the hazardous index(HI) of MeHg in grain exceeded 1, posing a potential threat to local populations, particularly pregnant women and children. 展开更多
关键词 MERCURY and METHYLMERCURY RICE MERCURY speciation and BIOAVAILABILITY Paddy SOIL Risk assessment
土壤pH对汞迁移转化的影响研究进展 预览
7
作者 窦韦强 安毅 +3 位作者 秦莉 林大松 曾庆楠 夏晴 《农业资源与环境学报》 CAS 北大核心 2019年第1期1-8,共8页
近年来土壤重金属污染已经成为全球性的环境问题。而汞作为五大毒性重金属元素之一,其在土壤中的迁移转化不仅会影响作物的正常生长,还会对农产品质量和安全造成严重威胁。土壤pH是影响汞迁移转化的重要因素之一,对其作用机理的不断探... 近年来土壤重金属污染已经成为全球性的环境问题。而汞作为五大毒性重金属元素之一,其在土壤中的迁移转化不仅会影响作物的正常生长,还会对农产品质量和安全造成严重威胁。土壤pH是影响汞迁移转化的重要因素之一,对其作用机理的不断探索已经成为近年来的研究热点。本文在前人的研究基础上,概述了土壤中汞的来源、危害及存在形态,并从汞的生物有效性及迁移转化过程两个方面详细阐述了土壤pH对汞迁移转化的影响机制。研究表明,酸性条件可能会使土壤中有效态汞的含量增加,进而导致其生物有效性提高,迁移能力增强;土壤pH对汞迁移转化过程中吸附-解吸的影响较大;土壤pH对汞迁移转化过程中络合-螯合、氧化-还原及甲基化反应的影响机理分别体现在离子竞争吸附、价态变化及甲基化促使因子的合成等方面。最后对今后的研究方向作出展望,旨在为汞污染土壤的修复与治理及汞污染扩散模型的建立提供参考依据。 展开更多
关键词 土壤 PH 迁移 转化
在线阅读 免费下载
安宁河断裂带土壤汞的分布特征 预览
8
作者 张磊 刘耀炜 +1 位作者 包创 郭丽爽 《地震学报》 CSCD 北大核心 2019年第2期249-258,I0002共11页
对安宁河断裂带地表破裂带土壤的总汞(THg)、总有机碳(TOC)和主量元素的含量进行了研究。结果表明,在小庙和紫马跨地表破裂带测线上,土壤THg与土壤气Hg含量的峰值位置较为一致,能够指示出断裂带释放Hg的通道位置。小庙、羊福山、野鸡洞... 对安宁河断裂带地表破裂带土壤的总汞(THg)、总有机碳(TOC)和主量元素的含量进行了研究。结果表明,在小庙和紫马跨地表破裂带测线上,土壤THg与土壤气Hg含量的峰值位置较为一致,能够指示出断裂带释放Hg的通道位置。小庙、羊福山、野鸡洞和紫马跨地表破裂带土壤垂向剖面上THg与TOC的相关系数表明,TOC是影响土壤THg含量的重要因素。通过土壤THg与TOC,THg与化学蚀变指数(CIA)的相关系数以及THg含量的垂向分布模式,识别出安宁河断裂带土壤THg剖面的干扰来源、背景来源和断裂带脱气来源,为分析Hg的分布特征与构造活动之间的关系提供参考依据。 展开更多
关键词 安宁河断裂带 土壤 总有机碳 风化程度
在线阅读 下载PDF
沱江干流内江段沉积物汞和铬污染状况研究 预览
9
作者 张金洋 何艾红 +2 位作者 何蝶 王露 谭锐 《四川环境》 2019年第3期51-57,共7页
采集沱江干流内江段的6个位点的沉积物样品,测定其中有机质、汞和铬含量,分析此区段沉积物中的重金属污染状况。结果表明沱江干流内江段沉积物中有机质含量范围是在9.129~27.323g/kg之间,总汞含量范围是在0.055~0.160mg/kg之间,总铬含... 采集沱江干流内江段的6个位点的沉积物样品,测定其中有机质、汞和铬含量,分析此区段沉积物中的重金属污染状况。结果表明沱江干流内江段沉积物中有机质含量范围是在9.129~27.323g/kg之间,总汞含量范围是在0.055~0.160mg/kg之间,总铬含量范围是在87.4~146.8mg/kg之间。将有机质、总汞和总铬含量和我国土壤环境标准对比,沱江干流内江段有机质含量大多处于四级,五级阶段;总汞含量处于一级、二级阶段;总铬含量处于二级阶段。根据地累积指数分析,该区段中游地区受到轻度污染;根据生态风险单项指数分析汞生态风险大多处于中低状态,只有白马镇地区汞生态风险较重,铬生态风险普遍处于低状态;由污染负荷指数分析,该区段重金属污染处于中度污染状态,并有加深污染的趋势。 展开更多
关键词 沉积物 有机质
在线阅读 下载PDF
盐渍化环境下秸秆还田对稻米汞及甲基汞累积的影响 预览
10
作者 郑顺安 韩允垒 +4 位作者 袁宇志 倪润祥 吴泽嬴 黄宏坤 师荣光 《中国环境科学》 EI CAS CSCD 北大核心 2019年第1期243-248,共6页
通过盆栽试验探讨了盐渍化环境下秸秆还田对土壤中总汞(THg)、甲基汞(MeHg)含量和转化以及对水稻吸收汞的影响.试验用土采集自天津典型污灌地区,人为添加不同梯度的盐分(0、0.2%、0.5%NaCl)及外源汞(0、5mg/kg~Hg(NO3)2),秸秆还田按照0... 通过盆栽试验探讨了盐渍化环境下秸秆还田对土壤中总汞(THg)、甲基汞(MeHg)含量和转化以及对水稻吸收汞的影响.试验用土采集自天津典型污灌地区,人为添加不同梯度的盐分(0、0.2%、0.5%NaCl)及外源汞(0、5mg/kg~Hg(NO3)2),秸秆还田按照0.1%进行处理.结果显示:1.秸秆还田促进稻田系统中无机汞的甲基化.与未添加秸秆的处理相比,秸秆还田后土壤MeHg含量提高了56.8%~76.8%,水稻MeHg含量增加了127%~171.6%.2.在轻度盐渍化稻田开展秸秆还田,会进一步提高稻田土壤中汞的甲基化水平,进而增加水稻籽粒中甲基汞含量.与不添加盐分处理相比,轻度盐渍化环境中(0.2%NaCl),秸秆还田处理导致土壤MeHg含量提高了92.2%~101.2%,水稻籽粒MeHg含量增长了52.8%~132.1%.更高的盐渍化水平会抑制土壤汞甲基化趋势,水稻籽粒中甲基汞含量降低.在中度盐渍化环境中(0.5%NaCl),秸秆还田导致土壤MeHg含量降低了57.9%~88.6%,水稻籽粒MeHg含量降低了72.9%~86.8%.以上研究结果表明,在盐渍化且汞污染稻田开展秸秆还田可能大幅度增加该地区汞食物链暴露风险,因此在中轻度盐渍化的污灌区,对秸秆还田等农艺措施需要格外慎重. 展开更多
关键词 盐分 甲基汞 水稻 秸秆还田
在线阅读 下载PDF
A Historical Sedimentary Record of Mercury in a Shallow Eutrophic Lake: Impacts of Human Activities and Climate Change 预览
11
作者 Hanxiao Zhang Shouliang Huo +3 位作者 Kevin M. Yeager Beidou Xi Jingtian Zhang Fengchang Wu 《工程(英文)》 2019年第2期296-304,共9页
Mercury and its derivatives are hazardous environmental pollutants and could affect the aquatic ecosystems and human health by biomagnification. Lake sediments can provide important historical information regarding ch... Mercury and its derivatives are hazardous environmental pollutants and could affect the aquatic ecosystems and human health by biomagnification. Lake sediments can provide important historical information regarding changes in pollution levels and thus trace anthropogenic or natural influences. This research investigates the 100-year history of mercury (Hg) deposition in sediments from Chao Lake, a shallow eutrophic lake in China. The results indicate that the Hg deposition history can be separated into three stages (pre-1960s, 1960s–1980s, and post-1980s) over the last 100 years. Before the 1960s, Hg concentrations in the sediment cores varied little and had no spatial difference. Since the 1960s, the concentration of Hg began to increase gradually, and showed a higher concentration of contamination in the western half of the lake region than in the eastern half of the lake region due to all kinds of centralized human-input sources. The influences of anthropogenic factors and hydrological change are revealed by analyzing correlations between Hg and heavy metals (Fe, Co, Cr, Cu, Mn, Pb, and Zn), stable carbon and nitrogen isotopes (d13C and d15N), nutrients, particle sizes, and meteorological factors. The results show that Hg pollution intensified after the 1960s, mainly due to hydrological change, rapid regional development and urbanization, and the proliferation of anthropogenic Hg sources. Furthermore, the temperature, wind speed, and evaporation are found to interactively influence the environmental behaviors and environmental fate of Hg. 展开更多
关键词 Lake sediment MERCURY Vertical distribution ANTHROPOGENIC activities
在线阅读 免费下载
Effects of temperature and SO3 on re-emission of mercury from activated carbon under flue gas conditions
12
作者 Michael Royko Benjamin Galloway +1 位作者 Noah D.Meeks Bihter Padak 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第5期67-73,共7页
Mercury(Hg) is a toxic and bio-accumulating heavy metal that is predominantly released via the combustion of coal. Due to its toxicity, the Environmental Protection Agency(EPA)has introduced Mercury and Air Toxics Sta... Mercury(Hg) is a toxic and bio-accumulating heavy metal that is predominantly released via the combustion of coal. Due to its toxicity, the Environmental Protection Agency(EPA)has introduced Mercury and Air Toxics Standards(MATS) Rule regarding allowable Hg emissions. In order to reduce emissions, power plants have widely adopted activated carbon(AC) injection. AC injection has proven to be an effective method to reduce Hg emissions, but the re-emission of previously adsorbed Hg during unit operation, likely due to changing temperature or flue gas composition, could be problematic. This study specifically examined the effects of temperature and sulfur trioxide(SO3) concentration,by ramping temperature and SO3 concentration independently and simultaneously, on AC samples that are already exposed to flue gas and saturated in presence of Hg, sulfur dioxide(SO2) and nitric oxide(NO). Of these two suspected factors to cause re-emission,temperature had the greater impact and resulted in re-emission of both elemental and oxidized Hg with a greater fraction of oxidized Hg, which can be attributed to elemental Hg being more strongly bonded to the AC surface. Surprisingly, exposing the samples to increasing concentrations of SO3 had nearly no effect under the conditions examined in this study, possibly as a result of the samples being already saturated with sulfur prior to the SO3 ramp tests to simulate transient conditions in the plant. 展开更多
关键词 MERCURY re-emission Sulfur TRIOXIDE Activated carbon
电石法PVC含汞废水处理装置运行总结 预览
13
作者 赵涛 黄志亮 +3 位作者 张敏 张迎 夏同成 熊仁军 《聚氯乙烯》 CAS 2019年第2期37-39,共3页
介绍了湖北宜化化工股份有限公司采用“化学沉淀+离子交换”法对电石法PVC含汞废水处理的工艺流程,并对含汞废水处理装置调试过程中出现的问题进行了优化改进。处理后出水含汞质量浓度小于0.002mg/L,废水全部回用,水处理成本35.2元/m^3。
关键词 电石法PVC 废水 回收利用
在线阅读 下载PDF
山东省东南地区土壤重金属含量调查 预览
14
作者 吴建新 孟缘 黄雨诺 《世界有色金属》 2019年第10期231-232,共2页
本研究样地选择在沂蒙山区边缘处的茶山风景区,研究目的为探索茶山林地土壤重金属含量。结果显示:茶山林地土壤有效态铅、有效态镉、总汞、总砷、总镍和总铬含量均值分别为5.52g/kg、0.06mg/kg、0.34mg/kg、0.79mg/kg、9.72mg/kg和18.28... 本研究样地选择在沂蒙山区边缘处的茶山风景区,研究目的为探索茶山林地土壤重金属含量。结果显示:茶山林地土壤有效态铅、有效态镉、总汞、总砷、总镍和总铬含量均值分别为5.52g/kg、0.06mg/kg、0.34mg/kg、0.79mg/kg、9.72mg/kg和18.28mg/kg,土壤重金属污染等级分别为1级、1级、2级、1级、1级和1级,基本为土壤背景数值,没有重金属污染风险。 展开更多
关键词 土壤 重金属
在线阅读 下载PDF
原子荧光光谱法在测定矿产中汞含量的应用研究 预览
15
作者 刘勇 《世界有色金属》 2019年第6期176-176,178共2页
试样先经硫酸处理后再加入高氯酸、过氧化氢破坏有机质,以逆王水溶解样品,加入适量的重铬酸钾作保护剂,不经分离于原子荧光光度计上,选定仪器工作条件,用SnCl2作还原剂直接测定矿物中微量汞的含量。汞的相关系数为0.9999,检出限≤0.005n... 试样先经硫酸处理后再加入高氯酸、过氧化氢破坏有机质,以逆王水溶解样品,加入适量的重铬酸钾作保护剂,不经分离于原子荧光光度计上,选定仪器工作条件,用SnCl2作还原剂直接测定矿物中微量汞的含量。汞的相关系数为0.9999,检出限≤0.005ng/mL,测定范围(0.0005~6)×10^-6g。 展开更多
关键词 原子荧光光谱法 矿产 测定
在线阅读 下载PDF
全自动消解-原子荧光光谱法测定土壤中总汞含量方法研究
16
作者 范璐 《黑龙江环境通报》 2019年第1期38-40,43共4页
研究全自动消解-原子荧光光谱法测定土壤中汞含量的方法,在浓度含量在0.10-4.00μg/L范围内和荧光强度值呈现良好线性关系,相关系数r>0.999;加标回收率范围:90%-106%,实验结果比对国家标准方法没有显著差异,能满足土壤监测分析方法... 研究全自动消解-原子荧光光谱法测定土壤中汞含量的方法,在浓度含量在0.10-4.00μg/L范围内和荧光强度值呈现良好线性关系,相关系数r>0.999;加标回收率范围:90%-106%,实验结果比对国家标准方法没有显著差异,能满足土壤监测分析方法中对于汞含量的相关要求。 展开更多
关键词 土壤 全自动消解 原子荧光光谱法
2015-2016年洛阳市市售蔬菜中铅、镉、汞、砷、铬、镍含量分析
17
作者 常晓歌 龚进国 胡寅瑞 《河南预防医学杂志》 2019年第5期351-354,357共5页
目的了解洛阳市市售蔬菜中重金属污染的现状,为政府部门制定食品安全政策提供数据分析基础。方法2015-2016年5月、11月分别在洛阳市三县四区内随机选择90份市售蔬菜,按照国标方法测定其铅、镉、汞、砷、铬、镍的含量。结果重金属检出率... 目的了解洛阳市市售蔬菜中重金属污染的现状,为政府部门制定食品安全政策提供数据分析基础。方法2015-2016年5月、11月分别在洛阳市三县四区内随机选择90份市售蔬菜,按照国标方法测定其铅、镉、汞、砷、铬、镍的含量。结果重金属检出率依次为:汞95%、镉93%、镍83%、铬80%、铅64%、砷53%;除了镍无法判断,其余元素超标率分别为铅10%、镉5.6%、汞4.4%,砷、铬无超标;洋葱、西红柿、油麦菜等蔬菜重金属污染较突出。结论洛阳市市售蔬菜中重金属均有检出,铅污染较镉、汞严重,政府部门可以将鳞茎类、茄果类、叶菜类蔬菜列为重点品种加大监测力度。 展开更多
关键词 蔬菜 重金属污染 重点品种 监测
内蒙古四种牧草对土壤汞的富集能力与生理响应 预览
18
作者 刘阳 王道涵 杜俊楠 《地球环境学报》 CSCD 2019年第1期87-93,共7页
随着内蒙古就地煤电转化发展方式的推行,周边土壤中来自大气汞沉降逐步加剧。为了解牧草对汞的富集能力与耐性机理,选取内蒙古草场常见四种牧草:羊草、紫花苜蓿、披碱草和高羊茅进行研究。通过野外汞沉降模拟试验及汞胁迫盆栽种植试验,... 随着内蒙古就地煤电转化发展方式的推行,周边土壤中来自大气汞沉降逐步加剧。为了解牧草对汞的富集能力与耐性机理,选取内蒙古草场常见四种牧草:羊草、紫花苜蓿、披碱草和高羊茅进行研究。通过野外汞沉降模拟试验及汞胁迫盆栽种植试验,分别测定土壤、牧草中的总汞含量及牧草的生理生化值,分析被试牧草汞含量与土壤汞含量相关性。供试土壤为砂土,pH在7.43—8.53,当土壤中汞含量不高于1.0mg·kg^-1时,四种牧草富集系数皆大于1。结果表明:不同牧草对汞富集能力不同并且会受土壤中汞含量影响,牧草对汞的富集系数随汞胁迫浓度增高而逐渐下降,汞胁迫下牧草细胞膜脂过氧化程度提高,牧草通过提高抗氧化酶酶活、脯氨酸含量调节细胞是其耐受汞的重要机理。 展开更多
关键词 牧草 富集 生理响应
在线阅读 下载PDF
原子荧光光谱法测定六种天然香辛料调味品中的砷、汞、硒 预览
19
作者 李利华 宋凤敏 《中国调味品》 CAS 北大核心 2019年第5期161-163,共3页
该研究利用原子荧光光谱法测定了6种天然香辛料调味品中砷、汞、硒的含量。在优化的实验条件下,3种元素的检出限介于0.02~0.03μg/L之间,符合测定要求。该方法测定砷的回收率为96.9%~106.3%,汞的回收率为97.8%~102.8%,硒的回收率为95.7%... 该研究利用原子荧光光谱法测定了6种天然香辛料调味品中砷、汞、硒的含量。在优化的实验条件下,3种元素的检出限介于0.02~0.03μg/L之间,符合测定要求。该方法测定砷的回收率为96.9%~106.3%,汞的回收率为97.8%~102.8%,硒的回收率为95.7%~103.5%,6种天然香辛料调味品中砷、汞、硒含量均未超出限量值。该方法准确、灵敏、快速,可应用于天然香辛料调味品样品中砷、汞、硒的同时测定。 展开更多
关键词 原子荧光 天然香辛料调味品
在线阅读 下载PDF
A comparison of fish tissue mercury concentrations from homogenized fillet and nonlethal biopsy plugs
20
作者 Alexis Knight Satyendra PBhavsar +4 位作者 Brian ABranfireun Peter Drouin Ram Prashad Steve Petro Moustapha Oke 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第6期137-145,共9页
The use of biopsy plugs to sample fish muscle tissue for mercury analyses is a viable alternative to lethal sampling;however, the practice has yet to be widely implemented in routine monitoring due to concerns about v... The use of biopsy plugs to sample fish muscle tissue for mercury analyses is a viable alternative to lethal sampling;however, the practice has yet to be widely implemented in routine monitoring due to concerns about variability of mercury concentrations in fish muscle tissues. Here we examine distribution of mercury in fillets of four fish species(Walleye, Northern Pike, Smallmouth Bass and Lake Trout), suitability of left/right side of fillet for biopsy sampling, and appropriateness of re-using a biopsy punch. The results showed that average mercury concentrations in left and right fillets of fish are similar.Mercury concentrations in biopsy plug samples, taken from the anterior dorsal area of the fish fillet, were statistically equivalent to the mercury concentrations in homogenized fillets. There was no discernible cross contamination between samples when a biopsy punch was reused after washing in hot soapy water, and as such, biopsy punches can be recycled during sampling to reduce the sampling cost. If a tissue mass collected from a specific site on the fillet is insufficient, then we suggest sampling corresponding locations on the other fillet rather than sampling two adjacent sites on one fillet to obtain more tissue. The results presented here can improve the accuracy of fillet biopsy plug sampling,minimize fish mortality for mercury monitoring, and reduce labor and material costs in monitoring programs. 展开更多
关键词 Hg or MERCURY Fish ADVISORY Nonlethal Monitoring MUSCLE tissue BIOPSY PUNCH plug
上一页 1 2 250 下一页 到第
使用帮助 返回顶部 意见反馈