环境介质中铊的分布和运移综述

本文综述了铊在岩矿石、土壤、植物、动物及大气等环境介质中的分布和运移机理及一些生物效应。在矿床中 ,铊主要分布在低温热液铊、铅、锌、锑、汞、砷等矿床中 ,铊的富集与其亲硫性及有机质密切相关 ,[TlCl4 ]-是铊迁移的主要形式。在土壤中 ,铊主要以水溶态、硫化物结合态、硅酸盐结合态和有机质结合态存在 ,水溶态的铊容易迁移。在植物中 ,铊的运移与钾在植物中的传输有关。在动物中 ,铊对各组织器官的亲和能力依次为 :肾 >睾丸 >脾 >前列腺 >毛发。在大气中 ,铊主要以TlF形式迁移     

正己烷萃取—此外分光光度法测定矿井水中微量油

在进行矿井水中油类分析时，用正己烷作为萃取剂，以工作曲线代替标准曲线，从而使油平均回收率增加到96％以上。并在正己烷用量、水样预处理等测试参数选择上做了条件试验。     

A complete set of procedure for determination of multiresidue of pesticides in vegetables

A complete set of procedure for determination of multiresidue of pesticides in vegetables was presented in this paper.The complete set of procedure included three steps:bioassay,cholinesterase inhibition and GLC analysis.The samples could be identified to be contaminated with pesticides if 5% of house flies was knocked down in 50 tested house flies. Those samples contaminated with pesticides needed to be detected by AChE inhibition method.The qualitative and quantitative analyses were carried out by GLC.Recoveries ranged from 83.7% in Chinese cabbages to 105.6% in tomatoes for pyrethroids,and 84.0% in tomatoes to 102.7% in sweetbell redpeppes for organophosphorus compounds.Coefficients of variations ranged from 0.59% to organophosphorus compounds.Coefficients of variations ranged from 0.59% to 7.87% for pyrethroids. and 0.33% to 9.88% for organophosphorus compounds with vegetables. The complete set of procedure has been used successfully to analyze 7000 samples collected in Beijing. About 1% of the samp     

A.Tessier逐级提取程序应用于土镉形态研究的可靠性

以国家级土壤标准物GBW07401为样本,定量添加不同化学形态的镉,对较流行的加拿大地球化学家Andre’Tessier推荐的颗粒态痕量金属形态逐级提取程序进行了可靠性研究.结果表明,这一程序能以较高的准确度、精密度对土壤中各种形态的镉进行逐级提取.尽管各级分间有跨级现象,全部加标试样的平均镉回收率为97.93％.     

A pilot project to detect and forecast harmful algal blooms in the northern Gulf of Mexico

More timely access to data and information on the initiation, evolution and effects of harmful algal blooms can reduce adverse impacts on valued natural resources and human health. To achieve this in the northern Gulf of Mexico, a pilot project was initiated to develop a user-driven, end-to-end (measurements to applications) observing system. A key strategy of the project is to coordinate existing state, federal and academic programs at an unprecedented level of collaboration and partnership. Resource managers charged with protection of public health and aquatic resources require immediate notice of algal events and a forecast of when, where and what adverse effects will likely occur. Further, managers require integrated analyses and interpretations, rather than raw data, to make effective decisions. Consequently, a functional observing system must collect and transform diverse measurements into usable forecasts. Data needed to support development of forecasts will include such properties as sea surface temperature, winds, currents and waves; precipitation and freshwater flows with related discharges of sediment and nutrients; salinity, dissolved oxygen, and chlorophyll concentrations (in vivo fluorescence); and remotely-sensed spatial images of sea surface chlorophyll concentrations. These data will be provided via a mixture of discrete and autonomous in situ sensing with near real-time data telemetry, and remote sensing from space (SeaWiFS), aircraft (hyperspectral imagery) or land (high-frequency radar). With calibration across these platforms, the project will ultimately provide a 4-dimensional visualization of harmful algae events in a time frame suitable to resource managers.     

江南Z市农村饮水有机污染物健康风险评估

应用化学法及吹扫捕集、气相色谱-质谱联用仪(GC-MS),检测Z市农村不同类型饮用水与癌症相关的有机污染物,对污染物的剂量与癌症标化死亡率进行Spearman等级相关分析。该市河水、池塘水、浅井水中部分样品的COD_Mn、BOD₅和NH₃-N指标超过地表水环境质量Ⅲ类标准,微生物指标超过生活饮用水卫生标准,检出NH₃-N及NO₃-N、NO₂-N合成致癌物NAD的2类前体物及NDMA等直接致癌物。Z市农村河水、池塘水、浅井水主要受生活排污和农业生产污染,不宜作生活饮用水。不同类型饮用水有机污染物丰水期高于枯水期(P值均小于0.05)。癌症标化死亡率与不同类型饮用水有机污染浓度呈等级正相关(P值均小于0.05),与NO₂-N、NDMA、NDEA含量呈剂量-效应关系。直接饮用污染的地表水是造成该市农村癌症高发聚集分布的主要原因之一。     

关于中小城市生活垃圾的处理与回收利用的探讨

对城市生活垃圾的分类回收、处理进行了探讨，对完善城市基础设施建设，改善投资环境将起到重要作用。     

膜、柱串联固相萃取-高效液相色谱法测定水中多环芳烃(PAHs)的研究

建立了用膜-柱串联固相萃取(SPE)技术,甲醇和水作为流动相进行梯度洗脱,紫外和荧光检测器串联的高效液相色谱法(HPLC)分析水中EPA优先监控的16种PAHs的方法.     

试点城市O3浓度特征分析

利用2009年O3试点城市的03监测数据,分析了北京、天津、上海、青岛、沈阳和广东的03浓度变化特征,统计了年超标情况,并结合气象要素数据分析了其对03浓度的影响.结果表明,不同城市各点位间03浓度变化趋势基本一致,但因点位类型不同,浓度存在差异;O3浓度呈单峰型日变化,在13:00-15:00出现最大值,6:00-7:00出现最小值;O3超标主要集中在4-8月份,广州和北京超标现象较多;O3浓度受温度、降水、风速和风向等气象要素影响较大.     

浅谈水体中硫化物保存、分离和测定方法的选择

水体中的硫化物是环境监测和工厂验收监测的一个重要参数.由于水中硫化物的不稳定性和水体中的干扰物质较多,保存常用技术为醋酸锌-氢氧化钠保存技术,但由于测定的手段不同,可根据不同的测定方法选用不同的保存和分离技术.比色法和碘量法时选用锌盐保存技术,分离技术有吹气分离、负压抽气分离或酸性溶液加锌产生氢气分离,选用不同的吸收液后测量;用间接测定技术时,可选用不同的金属盐进行沉淀后测定金属离子;选用电化学方法测定时,可选用使用于电化学的保存技术.为了准确地测定水体中的硫化物,宜选择最好的保存技术、分离技术和测定方法,并且必须使保存技术和测定方法相匹配,获得完善的监测技术和准确的监测结果.