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131.
在水环境保护形势趋紧、水质监测要求逐步提高的背景下,地表水中挥发性有机物测定的精确性、高效性要求也需不断提高。文章分别用国标规定的气相色谱法与美国EPA的气-质联用法对地表水环境质量标准要求监测的109项中的23种挥发性有机物进行了测定比对。结果发现:国标规定的气相色谱法测定各挥发性有机物虽能达到规定的检出限、准确度、精密度,但相对于气-质联用,国标规定的气相色谱法存在步骤繁琐、仪器设备需求量大、实验人员多、实验效率低、浪费更多实验资源等缺点。 相似文献
132.
利用AFS-9330双道原子荧光光度计测定水中的锡,以1.0%的盐酸作为载流液、1.0%的硼氢化钾为还原剂,荧光强度与其质量浓度在040μg/L范围内,线性良好,相关系数为0.9992,方法检出限为0.06μg/L,相对标准偏差在1.79%40μg/L范围内,线性良好,相关系数为0.9992,方法检出限为0.06μg/L,相对标准偏差在1.79%2.83%之间,加标回收率为91.0%2.83%之间,加标回收率为91.0%103%。 相似文献
133.
Nervous system active pharmaceutical ingredients (APIs), including anti-depressants and opioids, are important clinically administered pharmaceuticals within healthcare facilities. This study provides source characterization data describing the composition and magnitude of nervous system APIs present in healthcare facility wastewaters. Concentrations and mass loadings of ten nervous system APIs and three nervous system API metabolites are reported for wastewaters from a hospital, nursing, assisted living, and independent living facility within a single municipality. Concentrations of nervous system APIs ranged from non-detectable levels for alprazolam in all four facility wastewaters to a high of 290 ng/L amitriptyline in nursing facility wastewater. The summed mean concentration of all thirteen analytes ranged from 402 ng/L in independent living facility wastewater to 624 ng/L in assisted living facility wastewater. Wastewater flow rates from each facility were combined with concentration data to estimate the daily mass loading of nervous system APIs leaving each facility through wastewater discharge to the municipal sewer system. The total mass loading of all thirteen analytes for the hospital, nursing, assisted living, and independent living facility was 228, 44, 29.5, and 28.1 mg/day, respectively. The total mass loading of nervous system APIs contributed to the municipality's wastewater from all four facilities was 330 mg/day. 相似文献
134.
Tadesse Fetahi Michael SchagerlSeyoum Mengistou Simone Libralato 《Ecological modelling》2011,222(3):804-813
We generated a mass-balance model to figure out the food web structure and trophic interactions of the major functional groups of the Ethiopian highland Lake Hayq. Moreover, the study lay down a baseline data for future ecosystem-based investigations and management activities. Extensive data collection has been taken place between October 2007 and May 2009. Ecotrophic efficiency (EE) of several functional groups including phytoplankton (0.8) and detritus (0.85) was high indicating the utilization of the groups within the system. However, the EE of Mesocyclops (0.03) and Thermocyclops (0.30) was very low implying these resources were rather a ‘sink’ in the trophic hierarchy. Flows based on aggregated trophic level sensu Lindeman revealed the importance of both phytoplankton and detritus to higher trophic levels. The computed average transfer efficiency of 11.5% for the first four trophic levels was within the range for highly efficient African lakes. The primary production to respiration (P/R) ratio (1.05) of Lake Hayq indicates the maturity of the ecosystem. We also modeled the food-web by excluding Tilapia and reduced phytoplankton biomass to get insight into the mass balance before Tilapia was introduced. The analysis resulted in a lower system omnivory index (SOI = 0.016) and a reduced P/R ratio (0.13) that described the lake as immature ecosystem, suggesting the introduction of Tilapia might have contributed to the maturity of the lake. Tilapia in Lake Hayq filled an ecological empty niche of pelagic planktivores, and contributed for the better transfer efficiency observed from primary production to fish yield. 相似文献
135.
Surface-active organic molecules (surfactants) may influence the ability of an aerosol particle to act as a cloud condensation nuclei by reducing its surface tension. One source of organic mass in aerosol particles, which may also contain surfactants, is bubble bursting on the sea surface. In order to directly compare these molecules in the ocean and aerosol particles, we developed a method using multiple solid phase extractions and high resolution mass spectrometry to characterize surface active organic molecules in both. This method has extraction efficiencies greater than 85%, 75%, and 60% for anionic, cationic, and nonionic surfactant standards, respectively. In this study, we demonstrate the presence of three ionic classes of surface active organics in atmospheric aerosol particles and estuarine water from Skidaway Island, GA. With this extraction method, organic molecules from both estuarine water and atmospheric aerosol particles significantly reduced surface tension of pure water (surface tension depression of ~ 18 mN/m) and had high ratios of hydrogen to carbon (H/C) and low ratios of oxygen to carbon (O/C), indicative of surfactants. While previous work has observed a larger fraction of anionic surface active organics in seawater and marine aerosol particles, here we show cationic surface active organics may make up a large fraction of the total surface active molecules in estuarine water (43%–47%). 相似文献
136.
Mahmoud A. Saleh Alaa Kamel Awad A. Ragab Gamal El‐Baroty Abdel Moneim M. Afify Joseph Jones 《毒物与环境化学》2013,95(3-4):429-444
Two hundred ninety‐two mother's milk samples were collected during 1994 from ten Egyptian governorates representing rural, metropolitan, and newly reclaimed desert areas. The samples were analyzed for 14 organochlorine insecticides and metabolites using electron capture gas chromatography and confirmed by gas chromatography/mass spectrometry (GC/MS). The overall samples average showed that the most abundant organochlorine insecticide residues were p,p'‐DDE, α‐endosulfan, β‐HCH and, p,p’‐DDT. Residues in the range of not detectable to less than 14μg/l whole milk were recorded for α‐HCH, heptachlor, heptachlor epoxide, aldrin, dieldrin, endrin endrin aldehyde and p,p'‐DDD. The percentage of samples exceeding the acceptable daily intake for children (ADIs) set by the FAO/WHO ranged from 19% to 44% in all governorates included in the study except the governorate of Minia in which only 2.6% of the samples exceeded the ADI values. The insecticides exceeding ADI values are mostly heptachlor and heptaclor epoxide (ADI = 3.12 μg/1 whole milk). 相似文献
137.
Yuan Meng Weiyi Liu Heidelore Fiedler Jinlan Zhang Xinrui Wei Xiaohui Liu Meng Peng Tingting Zhang 《Frontiers of Environmental Science & Engineering》2021,15(5):104
138.
Thomas T. Shen 《Environmental management》1982,6(4):297-305
Air pollution from hazardous waste landfills and lagoons is largely unknown. Routine monitoring of toxic air contaminants associated with hazardous waste facilities is difficult and very costly. The method presented in this paper would be useful for air quality assessment in the absence of monitoring data. It may be used as a screening process to examine the question of whether or not volatilization is considered to be significant for a given contaminant and also to evaluate permit applications for new hazardous waste facilities concerning waste volatilization problems. 相似文献
139.
本文探讨了灾害发生期的犯罪预防对策,认为在灾害发生期的不同时间进程中,犯罪预防工作有不同的重点和策略。灾害预报已经发出,灾害破坏作用尚未显露时,防范的重点是造谣惑众及封建迷信活动。灾害爆发时,对犯罪的首次打击效应十分重要。灾害爆发后,一定要迅速恢复和强化政法机关的职能活动,组织群众开展群防群治。随着灾害的持续或衰减,财产类犯罪开始抬头,且暴力倾向明显,此时应采取坚决措施,从重从快予以打击。 相似文献
140.