Results 101 to 110 of about 818 (152)

[Applications of molecularly imprinted solid-phase microextraction coupled with chromatography/mass spectrometry for determination of drug residues]. [PDF]

Se Pu
Yan J, Huang J, Peng S, Man M, Sun D, Liu P, Chen L, Li J, Fan H.   +8 more
europepmc   +1 more source

Effects of Planting Pattern on N Loss by Runoff in Purple Soil Agro-watersheds

, 2005
种植模式变化是农业非点源污染流域治理最佳管理措施的主要内容之一,以紫色土区徐家湾和桑树土典型农业小流域为例,初步探讨了套种和单作模式下自然降雨侵蚀过程次降雨土壤氮素的流失特征。结果表明,土壤硝态氮流失表现为套种与单作模式下的差异不显著,而铵态氮的流失受流域种植模式变化的影响强烈,套种模式下的平均流失浓度(0.453mg/L)明显大于单种模式下的(0.169mg/L)。套种模式应与流域土壤 ...
李占斌, 韩建刚
core  

[Matrix solid-phase dispersion extraction of organophosphorus flame retardants in soil based on response surface methodology]. [PDF]

Se Pu
Wang J, Xu S, Sun Y, Lei H, Cheng Y, Wang X, Zhang Z.   +6 more
europepmc   +1 more source

[Assessment on data processing methods for nontarget identification of per- and polyfluoroalkyl substances using liquid chromatography-high-resolution mass spectrometry]. [PDF]

Se Pu
Zhang BX, He QW, Han BC, Ma CD, Luo ZJ, Meng XZ.   +5 more
europepmc   +1 more source

[Determination of 51 per- and polyfluoroalkyl substances in raw water and drinking water by online solid-phase extraction coupled with ultra performance liquid chromatography- tandem mass spectrometry]. [PDF]

Se Pu
Chen YY, Lyu J, Ye BX, Zhang L, Wang YY, Jin N.   +5 more
europepmc   +1 more source

[Determination of sixteen antibiotics and four β-agonists in human urine samples using ultra-performance liquid chromatography-tandem mass spectrometry based on high-throughput automatic solid-phase extraction]. [PDF]

Se Pu, 2023
Li ZH, Hu XJ, Lu YF, Xie LN, Zhu Y.
europepmc   +1 more source

生物炭对土壤中氮磷有效性影响的研究进展

, 2016
利用生物炭在贫瘠的土壤上培育出肥沃的"黑土"正成为土壤学家研究的热点.氮、磷等大量养分是衡量土壤肥力高低的重要指标,生物炭对其有效性影响表现出极大的复杂性.不同研究得出的结论不尽相同,关键是缺乏对其机制的深入研究.由于氮和磷的不合理利用还可能造成非点源污染而带来环境风险,再加之生物炭施用的不可逆性,必须确保生物炭在任何情况下都不会对土壤和环境带来不利的影响.为此,本文综述了生物炭添加对氮肥和磷肥在土壤-植物系统迁移转化过程中的作用,重点讨论了不同生物炭处理方式对土壤磷素吸附解吸和形态转化的影响 ...
张友, 徐刚, 武玉, 秦松, 邵宏波   +4 more
core   +1 more source

[Research progress in material preparation and application of magnetism-enhanced in-tube solid-phase microextraction]. [PDF]

Se Pu
Luo YN, Chen J, Hu YY, Gao SJ, Wang YL, Liu YM, Feng JJ, Sun M.   +7 more
europepmc   +1 more source

Analysis of Soil Nitrogen Leaching Under Different Land Uses Patterns in the Loess Hilly and Gully Region

, 2009
通过对黄土高原丘陵沟壑区不同土地利用模式土壤剖面NO-3-N、NH+4-N、有机质和全氮分布的测定,论述黄土高原丘陵沟壑区不同土地利用模式对土壤氮素淋溶的影响,对当地农业发展提出建议。结果表明:在200 cm内土壤NO-3-N最大值都出现在200 cm处,其中日光温室最大为20.36 mg/kg。土壤NH+4-N在200 cm内是较均匀的分布在10~25 mg/kg。不同土地利用模式对土壤剖面土壤NH+4-N、有机质和全氮分布没有影响。随着深度的变化对土壤NH+4-N分布也没有影响 ...
徐福利, 邹诚, 闫亚丹
core  

[Toxicity of lunar dust simulant exposure via the digestive system: Microbiota dysbiosis and multi-organ injury]. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Chen Y, Liu Y, He S, Gong X, Cheng Q, Chen Y, Hu X, Wang Z, Xie H.   +8 more
europepmc   +1 more source