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551.
简述了长江南京段监测断面现状,用相关分析与聚类分析方法对水质监测数据进行了统计分析,对长江南京段水质自动监测优化布点提出了相关建议。 相似文献
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郭维超 《环境监测管理与技术》2015,27(5):52-54
采用顶空-气相色谱法测定地表水中松节油,并对顶空瓶的平衡温度、平衡时间,盐析效应和取样量等顶空条件进行优化,使方法在0.200 mg/L~4.00 mg/L范围内线性良好,方法检出限为0.037 mg/L。实际样品2个质量浓度水平的加标回收率为89.3%~108%,RSD分别为5.8%和4.8%。 相似文献
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结合我国污染场地的普遍特征以及场地初步调查的基本目标,从布点前期准备、布点原则、布点程序和布点方法等方面详细探讨了污染场地土壤初步调查的点位布设方法;并从采样准备、采集方法、采集程序以及现场记录等环节探讨了现场样品采集的注意事项和要求,以期为污染场地环境调查的土壤监测和采样提供借鉴。 相似文献
557.
被动采样监测环境空气中SO2和NO2 总被引:1,自引:0,他引:1
用自主研制的采样管开展环境空气中SO2和NO2的被动采样监测.结果表明,被动采样监测结果与自动监测结果高度相关,经回归方程修正后,两者的结果没有显著性差异,被动采样的采样和分析产生的误差得以消除. 相似文献
558.
Xi Li Chang Wen Chen Liu Shiyun Lu Zhongbing Xu Qiue Yang Zhi Chen Hanpeng Liao Shungui Zhou 《环境科学学报(英文版)》2022,34(5):363-373
The global dissemination of antibiotic resistance genes(ARGs), especially via plasmidmediated horizontal transfer, is becoming a pervasive health threat. While our previous study found that herbicides can accelerate the horizontal gene transfer(HGT) of ARGs in soil bacteria, the underlying mechanisms by which herbicides promote the HGT of ARGs across and within bacterial genera are still unclear. Here, the underlying mechanism associated with herbicide-promoted HGT was analyzed by detecting intr... 相似文献
559.
Rivera-Austrui J Borrajo MA Martinez K Adrados MA Abalos M Van Bavel B Rivera J Abad E 《Chemosphere》2011,82(9):1343-1349
The aim of this work is to evaluate the performance of a continuous monitoring system for the analysis of the mass concentration of PCDD/Fs from stationary sources. Data was acquired from a modern, state of the art, hazardous waste thermal treatment plant for a period of more than 2 years using a commercial available continuous monitoring system. The study consisted of a total of 16 samples, collected in periods from 1 week to 2 months resulting in an average of 360 m3 sampled flue gas per sample. The study showed the system was able to confirm that for a period of more than 2 years the plant was complying with the limit of 0.1 ng I-TEQ/Nm3. In addition, the data showed the typical fingerprint of such installations which is useful for example in impact studies. Long-term samples were compared to five short-term samples (6 h) collected every 6 months during the study period. Principal component analysis was applied to PCDD/Fs obtained data as useful statistical tool to find out trends and similarities between different samples. Improvement in terms of representativeness of data was achieved through continuous assessment since the starts of the project. The obtained data was further used to determine the emission factor for this activity and the total annual PCDD/Fs release to the atmosphere. 相似文献
560.
The use of the adsorbent styrenedivinylbenzene-reverse phase sulfonated (SDB-RPD) Empore disk in a chemcatcher type passive sampler is routinely applied in Australia when monitoring herbicides in aquatic environments. One key challenge in the use of passive samplers is mitigating the potentially confounding effects of varying flow conditions on chemical uptake by the passive sampler. Performance reference compounds (PRCs) may be applied to correct sampling rates (Rs) for site specific changed in flow and temperature however evidence suggests the use of PRCs is unreliable when applied to adsorbent passive samplers. The use of the passive flow monitor (PFM) has been introduced for the assessment of site-specific changes in water flow. In the presented study we have demonstrated that the Rs at which both atrazine and prometryn are accumulated within the SDB-RPD-Empore disk is dependent on the flow conditions. Further, the calibration of the measured Rs for chemical uptake by the SDB-RPD-Empore disk to the mass lost from the PFM has shown that the PFM provides an accurate measure of Rs for flow velocities from 0 to 16 cm s−1. Notably, for flow rates >16 cm s−1, a non linear increase in the Rs of both herbicides was observed which indicates that the key resistance to uptake into the SDB-RPD Empore disk is associated with the diffusion through the overlying diffusion limiting membrane. Overall the greatest uncertainty remains at very low flow conditions, which are unlikely to often occur in surface waters. Validation of the PFM use has also been undertaken in a limited field study. 相似文献