QTRAP LC-MS/MS技术在污染事故快速定性中的应用

采用液相色谱-四极杆/线性离子阱复合质谱(QTRAP LC-MS/MS)技术用于污染事故水样中未知农药的快速定性分析。由于QTRAP LC-MS/MS具有较好的灵敏度,样品无需前处理即可进样,大大提高了样品的分析速度。在某次污染事故水样定性分析工作中,该技术的应用非常快速地解决了污染源判定问题,为污染事故的应急处置提供了强有力的技术支撑。     

供给侧结构性改革中的环境保护若干战略问题

环境保护要抓住供给侧结构性改革的窗口机遇期,将改善生态环境质量纳入供给侧结构性改革的重要内容,将环境监管作为推进供给侧结构性改革的重要手段,通过全面深化改革提升环境治理体系和治理能力水平。同时,要精准应对供给侧结构性改革可能给环境保护带来的相关风险。     

生活中的消防误区

一、液化气钢瓶置于灶台下的壁橱内.液化气钢瓶由于质量、使用时间以及管路阀门的开启连接等因素都有可能造成漏气或慢性漏气.而液化石油气成分大多为碳三碳四,即丙炕、丁烷、丙烯、丁烯等,且比空气重.     

成长中的管理 管理中的成长

“企业管理到底有没有固定的模式？实践告诉我们，所谓‘最好的模式’是没有定论的，适合才是最好的。企业应该根据不同的发展阶段来选择相应的管理模式，只有这样才能将管理的有效性发挥到极致。”[编者按]     

由"善骑者堕"想开去

沈某饮酒后驾车在双向四车道的公路上行驶，跨越中心双实线抄近道回家时，与对向韩某驾驶的小轿车相撞，造成韩某被甩出车外，又被其他过往车辆拖带至500米外并辗压致死。经现场勘察、调查取证，公安交警部门认定，沈某酒后驾车逆向行驶，应负事故的全部责任，其肇事行为与被害人死亡的结果有直接因果关系，其行为构成交通肇事罪，遂以沈某涉嫌交通肇事罪为由向检察机关移送本案。     

集中荷载下高强箍筋混凝土梁的抗剪性能

通过8根集中荷载下高强箍筋混凝土梁的受剪破坏试验，分析了500MPa箍筋混凝土构件斜截面的剪切承载力及使用阶段的斜裂缝宽度，同时对两组配有蒙皮钢筋的混凝土梁的受剪承载力及斜裂缝宽度进行了对比分析。试验结果表明，此类构件的受力性能与普通钢筋混凝土受剪构件相同，其斜截面受剪承载力仍可按现行《混凝土结构设计规范》有关公式进行计算，并且具有足够的安全储备。同时蒙皮钢筋的配置能够有效地限制裂缝的开展，改善受剪破坏的脆性性能。     

贯彻全国劳保学会“四大”精神 做好学会各项工作

2002年11月18日到19日，中国劳动保护科学技术学会在北京召开第四次会员代表大会，会议听取和审议了第三届理事会工作报告，修改了学会章程，选举产生了学会第四届理事会和常务工作机构。党和国家领导人对劳动保护学会工作十分重视，分别题词和发来贺信。李鹏委员长的题词是：“坚持安全生产方针，保护劳动者身心健康”，     

Toxicity of copper, lead, and cadmium on the motility of two marine microalgae Isochrysis galbana and Tetraselmis chui

Computer assisted movement tracking was used to characterize the motility of two marine microalgae, Isochrysis galbana and Tetraselmis chui, and to investigate the toxicity of Cu, Pb, and Cd on motile percentage, curvilinear velocity, average path velocity, straight line velocity, linearity, straightness, and wobble. Except for motile percentage, all other motility parameters di ered significantly between I. galbana and T. chui. Based on relative motile percentage data, the median e ective concentration (EC50) of Cu on the motility of I. galbana and T. chui was 31.4 and 1.3 mol/L, respectively, while for Pb it was 37.8 and 10.9 mol/L and for Cd it was 121.6 and 37.8 mol/L, respectively. Compared to I. galbana, T. chui was more sensitive to all tested metals. The toxic e ect of the heavy metals on motility exhibited the following decreasing order for both species: Cu > Pb > Cd. Our results indicate that I. galbana and T. chui motility is sensitive to heavy metals and can be used as an indicator for toxicology bioassays.     

Estrogenic effects of water from the Yangtze River （Nanjing section） on goldfish （Carassius auratus） after an early life stage exposure

Effects of river water from the Yangtze River (Nanjing section) on fish development, vitellogenin (VTG) induction, gonado-somatic index (GSI) and sex ratio were investigated by exposing goldfish (Carassius auratus) in the early life stage (from fertilization to 28 days post-hatch) to water samples (25%, 50% and 100%) collected from three representative sections. The results showed that there was no significant effect on hatching success for any of the exposure groups, but survival was significantly reduced when compared with the control (P < 0.05). Body lengths, weights of all treated fish did not differ significantly from those of the control. Condition factors (CF) of larval fish exposed to 50% and 100% river water from the Jiangxinzhou section and 100% river water from the Daqiao section were significantly lower than that of the control (P< 0.05). VTG inductions were significant in larval fish exposed to all the dilution series of river water. No significant difference in CF value was observed in any exposure group after 150 days of depuration. VTG was fully eliminated after 75 days of depuration. For both female and male, GSI did not significantly differ between exposure groups and the control after 150 days of convalescence. The highest female:male ratios were observed in response to the treatment with 50% or 100% river water from the Jiangxinzhou section and 100% river water from the Daqiao section (53:47, 56:44 and 54:46, respectively), but no significant difference in sex ratio was observed in any treated group when compared to the control. The results showed that early life stage exposure of river water from the Yangtze River (Nanjing section) had adverse effects on goldfish development and reproductive health, and the effects on CF and VTG were reversible after depuration in clean water.     

茂兰喀斯特森林演替阶段不同小生境的小气候特征

探讨了茂兰喀斯特森林不同演替阶段群落不同小生境的气温、湿度、光照强度和土壤温度的目变化特征,结果表明：各演替群落内大气温度和光照强度随演替逐渐降低,且降幅趋缓;空气相对湿度却随着群落演替而逐渐升高,但变幅减缓;5～20cm土壤温度随演替进展逐渐降低,随着土层深度的增加土温亦呈下降趋势且降温幅度减缓。以乔木林的生态环境和...