Phosalone applied to cotton (Gossypium hirsutum L.): its deposition and persistence on foliages, soils and final residues in seeds

Phosalone, O,O-diethyl-S-(6-chloro-1,3-benzoxazol-2(3H)-onyl)methyl phosphorodithioate, was field-applied by ground equipment to cotton (Gossypium hirsutum L.) at the rates of 1050 and 2100 g a.i./ha, respectively, to determine its dissipation on leaves and soils and the residues in seeds at harvest. The insecticide concentrations on cotton leaves and soils were measured periodically for 14 days following its application. It was found that the half lives of the insecticide on cotton leaves at the dosages of 1050 and 2100 g a.i./ha were 6.8 and 6.3 days, respectively. And the half lives on soils for the 2 dosages were 7 and 5.8 days, respectively. The residues remaining in soils at harvest time were 0.072 and 0.121 mg/kg 14 days post-application and the residues in cotton seeds were relatively low (less than 0.02-0.12 mg/kg).     

苯抽提装置火炬管线冻堵原因分析及处理措施

中国石化中原石油化工有限责任公司（以下简称中原乙烯）为拉长产业链,2004年7月建成苯抽提装置,采用石油化工科学研究院开发的环丁砜抽提蒸馏分离苯专利技术,设计处理裂解加氢汽油10×10^4t／a,生产纯苯5．1×10^4t／a。自投产以来,因苯检验罐、抽提蒸馏塔、密闭式取样器等主要设备排放火炬管线设计不合理,火炬管网不断出现波动,严重影响了苯抽提装置的平稳操作,经过对产生火炬管网波动原因的分析,并采取相应技术改造措施,恢复了苯抽提装置平稳操作。     

Fenton高级氧化工艺降解苯酚模拟废水的动力学实验研究

针对Fenton高级氧化反应动力学过程进行了精细研究和深入探讨,结果表明:Fenton氧化法降解苯酚模拟废水的过程并不是单纯地符合一级动力学过程,其降解过程符合公式的形式。实验还研究了过氧化氢、亚铁离子、pH值等反应参数与反应进程的关系,为其实际应用提供了数据积累和理论依据。     

普光气田应急指挥系统应急值守功能设计

应急值守作为应急指挥系统重要的组成部分,发挥着无可替代的作用。对普光气田应急指挥系统的应急值守功能进行了详细的介绍,包括日常值班、接警事件处理、预案关联及电话调度、自动录音、多方通话等。     

Predicting As, Cd and Pb uptake by rice and vegetables using field data from China

Plant uptake factor (PUF), single-variable regression of natural log-transformed concentrations in rice grain/vegetables versus natural log-transformed concentrations in soil and multiple-variable regression with soil concentrations and pH, was derived, validated and compared based on the paired crop and soil data collected from studies regarding As, Cd and Pb contaminated croplands in China. Results showed that the median value of PUF did not present deterministic prediction. But after natural logarithm transformation, the PUF followed Gaussian distribution which could be useful in risk assessment. The single-variable regression models were significant for As, Cd and Pb uptake both by rice and vegetables; however, the standard errors of all the regressions were comparatively large. Soil pH as a variable was generally significant but it only contributed positively to model fit for Cd uptake. After model comparison and selection, the upper 95% prediction limits of the multiple regression model for Cd uptake by rice was recommended to calculate screening value of Cd for paddy soil based on the limit for Cd concentration in rice grain.     

大同盆地火山活动研究综述

大同火山群位于大同盆地的东部,是火山活动的典型遗存.从30年代开始,国内外学者对火山群进行了地貌背景等方面的研究,初步认定大同火山为第四纪火山.近年来,随着对火山活动时期研究的不断深入,火山活动的年代逐步精确.本文对大同火山的研究现状进行了简要概述,并提出了对大同火山研究的进一步思路.     

PM1切割器的评价及其与PM2.5切割器的切换研究

开展了PM₁切割器的性能评价研究,通过搭建基于静态箱法的评价系统,选用8种粒径的单分散聚苯乙烯微球,结合空气动力学粒径谱仪获取PM₁切割器的捕集效率,最终得出拟合曲线.通过该方法测量得出某台BGI的PM₁切割器在16.67 L·min^-1工作流量下的50%切割粒径分布在(1.0±0.1) μm范围内,几何标准偏差分布在1.2±0.1范围内.同时研究了采样流量对PM₁切割器性能的影响,发现50%切割粒径随流量增大呈现减小趋势,而几何标准偏差一致性较好,偏差不超过1%,尤其当采样流量为6.77 L·min^-1时,PM₁切割器的性能可调整为符合国家标准对PM_2.5切割器的要求,本研究成果为PM₁切割器评价方法及性能指标的确定提供了参考.     

Mortality risk attributable to diurnal temperature range: a multicity study in Yunnan of southwest China

Environmental Science and Pollution Research - We aimed to estimate the non-accidental and cause-specific mortality burden attributed to diurnal temperature range (DTR) and the relative...     

Occurrence and risk evaluation of organophosphorus pesticides in typical water bodies of Beijing,China

Environmental Science and Pollution Research - Abstract Human activities, particularly in large cities, can lead to pollution caused by micropollutants such as pesticides in water bodies, which...     

脱硫、脱硝用脉冲电源的设计及工业应用

使用常规半导体开关和脉冲磁压缩技术开发了平均功率15 kW、脉冲上升时间500 ns、重复频率300 Hz的脱硫、脱硝用脉冲电源。配备了9台电源的脉冲电晕等离子体脱硫、脱硝装置,在1台130 t/h蒸发量的燃煤锅炉上配套使用,取得了59%的脱硫效率、53%的脱硝效率和77%的除尘效率。