食品企业周边空气中异味挥发性有机物测定方法比较

以1个典型食品生产企业(酱菜厂)周边的异味挥发性有机物监测为例,介绍了罐采样-GC/MS、便携式GC/MS、SPME-GC/MS以及SPME-异味分析系统等4种监测方法的实际应用,从定性、定量监测结果等方面,比较了4种监测方法的特点。罐采样-GC/MS、便携式GC-MS 2种方法适用于定性、定量检测,在有标准样品的前提下,定量结果总体可比;SPME-GC/MS以及SPME-异味分析系统2种方法更适用于定性检测。     

Application of Fe(VI) in abating contaminants in water: State of art and knowledge gaps

• The properties of Fe(VI) were summarized. • Both the superiorities and the limitations of Fe(VI) technologies were discussed. • Methods to improve contaminants oxidation/disinfection by Fe(VI) were introduced. • Future research needs for the development of Fe(VI) technologies were proposed. The past two decades have witnessed the rapid development and wide application of Fe(VI) in the field of water de-contamination because of its environmentally benign character. Fe(VI) has been mainly applied as a highly efficient oxidant/disinfectant for the selective elimination of contaminants. The in situ generated iron(III) (hydr)oxides with the function of adsorption/coagulation can further increase the removal of contaminants by Fe(VI) in some cases. Because of the limitations of Fe(VI) per se, various modified methods have been developed to improve the performance of Fe(VI) oxidation technology. Based on the published literature, this paper summarized the current views on the intrinsic properties of Fe(VI) with the emphasis on the self-decay mechanism of Fe(VI). The applications of Fe(VI) as a sole oxidant for decomposing organic contaminants rich in electron-donating moieties, as a bi-functional reagent (both oxidant and coagulant) for eliminating some special contaminants, and as a disinfectant for inactivating microorganisms were systematically summarized. Moreover, the difficulties in synthesizing and preserving Fe(VI), which limits the large-scale application of Fe(VI), and the potential formation of toxic byproducts during Fe(VI) application were presented. This paper also systematically reviewed the important nodes in developing methods to improve the performance of Fe(VI) as oxidant or disinfectant in the past two decades, and proposed the future research needs for the development of Fe(VI) technologies.     

Synthesis of glass fiber sphere using waste printed circuit board to support MIL-100(Fe) for dye adsorption in water

Environmental Science and Pollution Research - Glass fiber sphere (GFS), used as support of MIL-100(Fe) to treat dye wastewater, was successfully synthesized using glass fibers from waste printed...     

成都市河道表层沉积物(淤泥)铅污染特征

文章分析了成都市河道(沙河、府河、南河)表层沉积物淤泥铅含量特及铅同位素丰度比的测定数据,结果表明铅含量变化范围是21.1~279 mg/kg,平均值为65.3 mg/kg,中值55.2 mg/kg,统计标准差65.03,变异系数为0.996,说明河道表层沉积物含量变化大。端元物质的铅同位素组成特征是燃煤的放射成因铅高于燃油,可以示踪和鉴别成都市环境铅的污染来源。三河淤泥铅同位素组成均大多落在崔家店热电厂降尘和华能热电厂燃煤飞灰的范围,沙河、府河有少数几个样品点落在燃煤铅(崔家店热电厂燃煤降尘)和柴油铅之间,其铅的来源可能是两者的混合。     

Supervisor-Directed Emotional Labor as Upward Influence: An Emotions-as-Social-Information Perspective

To access organizational resources, subordinates often strive to influence supervisors' impressions. Moreover, subordinates' interactions with supervisors are known to be ripe with emotions. Nevertheless, research on upward impression management has rarely examined how subordinates' emotion regulation in supervisor interactions may shape their tangible outcomes. The present study introduces subordinates' emotional labor toward supervisors as a novel means of upward influence. Building on the emotions-as-social-information model, we propose that supervisor-directed emotional labor indirectly relates with supervisory reward recommendations by shaping supervisors' liking and perceived competence of subordinates. Moreover, we cast supervisors' epistemic motivation as a boundary condition for these indirect relations. We tested these notions using time-lagged data from 377 subordinates and 91 supervisors. When supervisors' epistemic motivation was higher (but not lower), (1) supervisor-directed surface acting related negatively with supervisors' liking and perceived competence of subordinates and (2) supervisor-directed deep acting related positively with supervisors' liking of subordinates. Liking and perceived competence, in turn, related positively with supervisors' willingness to recommend subordinates for organizational rewards. These findings highlight supervisor-directed emotional labor as an upward impression management strategy with both beneficial (deep acting) and detrimental (surface acting) implications, and they illustrate important mechanisms and a key contingency factor for these consequences.     

衡阳地质灾害特点及与降水相关性研究

衡阳地质环境复杂,人类工程活动频繁,是湖南省地质灾害高-中易发区。本文对影响地质灾害发生的地形地貌、地质构造、降水、人类活动强度等诸多因子量化处理,将衡阳划分出6个崩塌、滑坡及泥石流灾害高发带及4个塌陷地质灾害高发带;无论在年、月时间尺度上,地质灾害发生数与降水量的相关性均不好,但与80 mm以上降水次数的相关度高(r=0.845),80 mm以上降水可作为地质灾害发生的重要指标;1990年代以来,衡阳地质灾害数呈波动性增长,目前处于灾害高发后的趋缓期。一年中,7月发生地质灾害的几率较大(34.8%)。     

广州市重点工业源二氧化碳排放现状与减排措施研究

文章根据2011年广州市环境统计数据以及企业调研数据,参照IPCC2006国家温室气体清单指南及省级温室气体编制指南,计算出广州市重点工业源包括电力、热力的生产和供应业、原油加工及石油制品制造、黑色金属冶炼及压延加工业、非金属矿物制品业、纺织业、造纸及纸制品业等六大行业的二氧化碳排放量,达到4 644万吨。通过数据分析,研究了广州市重点工业源二氧化碳排放的行业特征与区域分布特征,并确定了广州市减排二氧化碳的工程措施和政策措施。     

声环境影响评价新导则应用研究

从新导则中的评价类别的确定、评价等级的划分、各评价等级的基本要求对比、声环境保护标准和噪声影响评价量的选用等方面分析了环评中理解和执行声环境影响评价新导则和声环境保护新标准中出现的问题,提出了相应的解决方法,以期促进正确合理地应用新导则和新标准,对做好声环境影响评价工作具有指导意义。     

Dynamics of phosphorus fractions and potential bioavailability along soil profiles from seasonal-flooding wetlands in a Chinese estuary

Environmental Science and Pollution Research - Soil phosphorus fractions in wetland ecosystems have received increasing attention due to its high eutrophication risks. Soil samples were collected...