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硝磺草酮在甘蔗和土壤中的残留行为
硝磺草酮 高效液相色谱配二极管阵列紫外检测 甘蔗 土壤 残留
2016/3/18
建立了硝磺草酮在甘蔗和土壤中的残留分析方法,并在广东和广西分别进行了10%硝磺草酮悬浮剂在甘蔗上残留的田间试验,研究了硝磺草酮在甘蔗和土壤中的消解动态和最终残留量。样品用乙腈提取,盐酸调节pH至3~4后二氯甲烷萃取,采用高效液相色谱配二极管阵列紫外检测器(HPLC-PDA)检测。结果表明:在0.01、0.1和1 mg/kg 3个添加水平下,硝磺草酮平均添加回收率为82%~84%,相对标准偏差(RS...
建立了土壤中草甘膦及其主要代谢物氨甲基膦酸高效液相色谱-串联质谱(HPLC-MS/MS)残留检测方法。样品经0.6 mol/L的氢氧化钾溶液提取、C18固相萃取柱过滤净化、9-芴基甲基三氯甲烷(FMOC-Cl)柱前衍生,以乙腈和5 mmol/L的乙酸铵为流动相,C18反相色谱梯度洗脱,电喷雾负离子多反应监测模式(MRM)HPLC-MS/MS检测。结果表明:草甘膦和氨甲基膦酸在1.6～200 μ g...
为探明毒死蜱对蚯蚓的影响,以赤子爱胜蚓Eisenia foetida为受试生物,以人工土壤为试验基质,采用接触暴露法,研究了毒死蜱对赤子爱胜蚓的急性毒性以及对蚯蚓生长和繁殖的影响。结果表明:在有效试验条件下,毒死蜱对蚯蚓的14 d-LC50值为88.75 mg/kg(每千克干土中含毒死蜱有效成分毫克数,其余同);暴露28 d后,10、25、50、80及100 mg/kg处理组蚯蚓的平均体重与对照相...
山核桃集约经营过程中土壤微生物量碳氮的变化
微生物量碳 微生物量氮 微生物量碳氮比 山核桃
2016/12/21
研究不同集约经营历史山核桃林的土壤微生物量碳氮的演变规律,为山核桃林地土壤管理提供科学依据。[方法] 在浙江省临安市分别采集并分析了经营历史为5,10,15,20 a的山核桃林土壤样品,并与天然混交林(0 a)进行比较。[结果] 天然混交林改造为山核桃纯林并经集约经营后,林地土壤微生物量碳(MBC)、微生物量氮(MBN)、MBC/MBN,MBC/SOC均表现出先下降而后上升的趋势,经过10 a经营...
新型杀菌剂苯菌酮在3种典型土壤中的淋溶行为
苯菌酮 超高效液相色谱-串联质谱 土壤 残留 淋溶
2016/3/18
农药在土壤中的淋溶规律已成为研究热点之一,同时也是农药登记的必备数据。建立了土壤中苯菌酮残留量的超高效液相色谱-串联质谱(UPLC-MS/MS)分析方法,并通过土壤薄层层析和土柱淋溶试验,研究了苯菌酮在我国3种典型土壤中的淋溶行为。结果表明:苯菌酮在3种土壤中的平均添加回收率在81%~109%之间,相对标准偏差(RSD)为1.2%~13.4%,检出限(LOD)为0.29~0.30μg/kg。薄层层...
Stability of soil aggregates and their ability of carbon sequestration
water-stable aggregates soil organic matter vineyards
2015/3/10
One of the most important binding agents for forming stable aggregates is a soil organic matter (SOM), which can be retained in various size fractions of aggregates. If aggregates are water-resistant,...
Interactive effects of arbuscular mycorrhizae and maize (Zea mays L.) straws on wheat (Triticum aestivum L.) growth and organic carbon storage in a sandy loam soil
Glomus caledonium rhizosphere acidification root-to-straw ratio soil enzyme straw return
2015/3/10
A pot experiment was conducted to study interactive effects of arbuscular mycorrhizae (AMs) and maize (Zea mays L.) straws on wheat (Triticum aestivum L.) growth and organic carbon (C) storage in a st...
Evaluation of the variability in runoff and sediment loss in successional fallow vegetation of Southern Nigeria
erosional losses soil erosion rainfall vegetation components vegetation fallows
2015/3/10
The effects of three different ages of natural fallow vegetation on runoff and sediment loss were investigated in a part of the rainforest zone of Nigeria. Measurements of runoff amount and sediment l...
Effects of zeolite and vermicompost applications on potassium release from calcareous soils
available K Iran K fertility kinetic models non-exchangeable K
2015/3/10
Zeolite and vermicompost applications to soil may improve K fertility of soils. For this purpose, these materials were added to five representative calcareous soils collected from southern Iran. The t...
Evaluation of the relationships between runoff-rainfall-sediment related nutrient loss (A case study: Kojour Watershed, Iran)
clockwise hysteretic loop organic matter phosphorus loss regression models suspended sediment
2015/3/9
Suspended sediment (SS) resulted from distributed soil erosions facilitates soil organic matter and phosphorus (P) transportation and influences soil depletion and water quality. Organic matter (OM) i...
Temporal variations of runoff and sediment in different soil clay contents using simulated conditions
clay erosion plot rainfall simulator
2015/3/9
Soil clay content (SCC) plays an essential role in the processes of infiltration, seal and crust formation, runoff, and soil erosion. The role played by SCC in water erosion has received much attentio...
Assessment of a soil with moderate level of contamination using lettuce seed assay and terrestrial isopods assimilation assay
Lactuca sativa short-term bioassays soil contamination woodlice
2015/3/9
Lettuce (Lactuca sativa) seeds play a significant role in toxicity tests of isolated chemicals, pesticides, and environmental samples. Commonly, the main variables under study are the rate of seed ger...
建立了基质固相分散-高效液相色谱法(MSPD-HPLC)测定2,4-二氯苯酚(2,4-DCP)和2-甲基-4-氯苯酚(4-C-2-MP)在3种不同类型土壤中残留量的分析方法。土壤样品加入硅胶研匀后,加入2.0 mL蒸馏水使其失活,装入层析柱,用二氯甲烷洗脱。向洗脱液中加入0.5 mL乙二醇,减压浓缩并定容至1.0 mL,HPLC测定。结果表明:在0.01～2.5 mg/kg添加水平下,3种土壤中两...
Soil toposequence under man-planted vegetation in the Krkonoše Mts., Czech Republic
altitude Krkonose Mts. podzolization toposequence vegetation
2015/3/5
Mountainous areas represent regions with specific soil cover pattern that is naturally given by an altitudinal gradient. The objective of our study was to describe the soil cover development on the al...
Elevated soil copper content in a Bohemian vineyard as a result of fungicide application
Bordeaux mixture copper toxicity fungicide potentially toxic elements vineyard soil
2015/3/5
A set of fifty samples were taken from soil surface layers of an anonymous vineyard in the Bohemia region of the Czech Republic. Samples were analysed for basic soil parameters including pH and humus ...