Results 1 to 10 of about 2,194 (176)
[Determination of 14 aniline and benzidine compounds in soil by gas chromatography-mass spectrometry]. [PDF]
Se Pu, 2023 针对土壤基质复杂及部分苯胺类化合物提取效率低的特点,基于气相色谱-质谱建立了土壤中14种苯胺类和联苯胺类化合物的分析方法。在采集后的土壤样品中加入5%亚硫酸钠水溶液进行密封,以防止目标物氧化变质,并于4 ℃以下冷藏保存,保存期限可达7天。实验比较了加速溶剂提取和振荡分散提取两种方式的提取效率,最终采用提取时加入碱性水溶液和乙酸乙酯-二氯甲烷(1∶4, v/v)的方法,在土壤-水相-有机相共存的条件下进行振荡分散萃取。萃取完成后经离心弃去土壤固相,将水相和有机相转移至分液漏斗中,并分离出有机相 ...
Wu L +5 more
europepmc +2 more sources
[Determination of organophosphate diesters in facility vegetable soils using ultra-high performance liquid chromatography-electrostatic field orbitrap high resolution mass spectrometry]. [PDF]
Se Pu, 2023 有机磷酸二酯(Di-OPEs)被认为是有机磷酸三酯的生物或非生物降解产物。该研究基于超高效液相色谱-静电场轨道离子阱高分辨质谱(UHPLC-Orbitrap HRMS)建立了设施菜地土壤中磷酸二(2-氯)乙酯(BCEP)、磷酸二(1,3-二氯异丙基)酯(BDCP)、磷酸二正丁酯(DnBP)、磷酸二苯酯(DPhP)和磷酸二(2-乙基己基)酯(DEHP)5种Di-OPEs的定性定量分析方法。首先,土壤样品以甲醇为提取溶剂,超声提取,选择Oasis WAX固相萃取柱进行净化,用8 mL含5% (v/v ...
Liu M +7 more
europepmc +2 more sources
Comparison of Particle Size Distributions Determined by Pipette Method and Scanning Electron Microscopy for Typical Soils in Water Erosion Region of China [PDF]
, 2023 [Objective] The particle size distributions (PSD) of different soils measured by scanning electron microscopy (SEM) and by the pipette method (PM) in the water erosion region of China was compared in order to provide a reference for the determination of ...
Bai Xue +4 more
core +1 more source
Analysis on Land Suitability for Maize and Rapeseed Production Based on Data Mining Method [PDF]
, 2022 [Objective] Conducting multi-crop land suitability analysis was carried out in order to provide an accurate and effective method for crop planning, land use planning, and management of agricultural production.
Lin Yan, Zhang Chen, Zhou Hua
core +1 more source
节能环保, 2022 为探究砷在茶园土壤和茶叶之间迁移规律，对土壤与茶叶之间的总砷、有效态砷迁移进行研究。结果表明：在pH≤4.5的酸性土壤环境下，茶园土壤中砷含量与富集系数的相关系数最高，相关性呈现负显著，其相关系数大小依次是：（pH≤4.5）＞（4.5＜pH≤5.0）＞（pH＞5.0），随着pH值的升高，茶园土壤中砷含量与富集系数的相关系数越低，相关性越不显著；在黏质土的土壤质地下，茶园土壤中总砷含量与富集系数的相关系数最高，相关性为负显著，其相关系数大小依次是：黏质土＞砂质土＞壤土，三种土壤质地其相关性均为负显著 ...
曾 沛艺 +3 more
semanticscholar +1 more source
Regional Runoff Characteristics in Zhengzhou City Based on SCS-CN Model [PDF]
, 2022 [Objective] The causes of waterlogging in Zhengzhou City were studied in order to provide a reference for risk prevention and operation management of rainstorm waterlogging disasters in important parts of the urban infrastructure.
Huang Haiping +5 more
core +1 more source
节能环保, 2022 治理地下水污染是中国水环境保护的重要组成部分。但地下水污染程度不仅与污染源密切相关，而且与水文地质条件密切相关。因此，该项目的重点是收集和研究现有的5~10个受污染点的监测结果和数据。在收集、学习其他国家先进采样技术和与中国专家交流的基础上，结合污染场地的实际情况，自行研究了几种现场土壤采样方法、地下水污染源判定方法。
刘 阳, 王 浩, 王 继宇
semanticscholar +1 more source
生态环境与保护, 2020 我国在近些年发生了很多的公众事件,其中包括开展了一系列场地污染的相关工作,同时又颁布了《土壤污染防治法》,以及化工园区爆炸或者是搬迁等,而这些都增加了对工业污染场地进行修复的市场需求。本文提出了“场地修复+”模式,也就是说将场地修复与各种性质的工作结合到一起的模式,同时对我国土壤污染治理的相关方给出了相关的建议。我们建议中国可以最大限度地发挥有关方在土壤污染治理中的作用,并给出了建议。
玉奇 胡
semanticscholar +1 more source
生态环境与保护, 2020 对建设用地土壤中苯胺的测定进行了研究,当采用超声波萃取、前处理过程中五水合硫代硫酸钠和氨水的投加剂量为2g和200ul时,获得了较好的方法性能：检出限为0.69mg/kg,测定下限为2.76mg/kg,加标回收率>90%,平行样的结果变异系数为2.8%；本文对苯胺前处理过程中回收率低等问题进行了分析探讨。
前龙 赵, 艳丽 耿, 文祥 马
semanticscholar +1 more source
Spatial and Temporal Changes and Driving Factors of Soil Erosion in North Piedmont of Yinshan Mountain [PDF]
, 2023 [Objective] The spatial and temporal changes of soil erosion and its influencing factors in the north piedmont of Yinshan Mountain from 2000 to 2020 were analyzed in order to provide scientific guidance for soil erosion control and land space planning in
Aruhan, Pan Haiwei, Wu Shuai
core +1 more source