Computerized continuous monitoring and analysis of ozone in solution

This paper presents a method for continuous monitoring of ozone in water by using the Indigo colorimetric technique. The details of an instrument developed and used for this purpose are explained. Data obtained using the continuous ozone reading equipment in monitoring the ozone levels are presented. The instrument also can be used to measure the decay of ozone in ozonated waters, continuously giving a very accurate measure of ozone decay coefficients.     

Adaptive neuro-fuzzy inference system based faulty sensor monitoring of indoor air quality in a subway station

A new faulty sensor monitoring method based on an adaptive neuro-fuzzy inference system (ANFIS) is proposed to improve the monitoring performance of indoor air quality (IAQ) in subway stations. To enhance network performance, a data preprocessing step for detecting outliers and treating missing data is implemented before building the monitoring models. A squared prediction error (SPE) monitoring index based on the ANFIS prediction model is proposed to detect sensor faults, where the confidence limit for the SPE index is determined by using the kernel density estimation method. The proposed monitoring approach is applied to detect four typical kinds of sensor faults that may happen in the indoor space of a subway. The prediction results in the subway system indicate that the prediction accuracy of an ANFIS structure with 15 clusters is superior to that of an appropriate artificial neural network structure. Specifically, when detecting one kind of complete failure fault that happened within the normal range, the detection performance of ANFIS-based SPE outperforms that of a traditional principal component analysis method. The developed sensor monitoring technique could work well for other kinds of sensor faults resulting from a noxious underground environment.     

大气污染问题的环境监测与应对策略

现阶段,经济建设与生态环境保护失衡已经是非常严峻的问题。因此,必须高度重视大气污染问题的环境检测,通过找准大气污染问题的具体原因,从而提出有效的应对策略,确保各个地区的生态建设能够走向正规,使其经济建设与生态环境保护能够并驾齐驱。     

Market report: indoor air quality

Environmental concerns over the quality of the indoor air we breathe continue to stimulate product demand and generate business opportunities within the filtration industry.     

内饰对汽车内部空气质量的影响

随着人们环保意识的增强,有众多的机构关注户外环境的空气质量状况,而目前至少有一家研究机构却把目光紧盯在有关室内空气质量影响人体健康的问题,特别是轿车内的空气状况问题,该研究机构认为,一辆轿车已有50%的部件是塑料制部件。     

气相色谱法应急监测空气中丙酮

目的：建立了空气中丙酮的气相色谱应急监测方法。方法：利用便携式大气采样器采集空气中气态丙酮，水吸收后经气相色谱分离，并用氢火焰离子化检测器（FID）测定。结果：本方法操作方便快捷，平均回收率大于95％，相对标准偏差小于3％。结论：本方法适合环境空气及工作场所空气中丙酮浓度的应急监测。     

环境空气质量新标准对扬州市空气质量评价结果的影响

本文分别采用新旧环境空气质量评价体系对2013年第二季度的扬州市环境空气监测数据进行了评价,并分析了新旧标准对于评价结果的影响。采用新标准评价会对空气质量评价产生明显影响,达标率下降,空气质量普遍变差。新标准更加科学客观,与公众主观感受更加接近。     

Stabilizers cut phenols to improve air quality

Crompton Corporation has launched a line of mixed metal stabilizers that eliminate or significantly reduce the phenol content of vinyl products.This is a short news story only. Visit www.addcomp.com for the latest additives and compounding industry news     

便携式GC-MS在交通干线环境空气VOCs监测中的应用

探讨使用INFICON公司生产的HAPSITEER便携式GO-MS联用仪,采用手持式一体化气体采样探头对交通干线环境空气中的VfCs进行监测。该仪器可以快速、有效的对交通干线空气中VOCs成分进行定性、半定量分析。     

大气污染的植物监测研究进展

随着工业发展、人口激增、车流量增大,大气污染日益严重,人类健康和地球本身受到严重威胁,监测空气质量并采取合理的治理措施以实现控制同时减少污染物的排放成为现今社会关注的焦点。采用植物监测大气污染程度,因其成本低、分布广泛、反应灵敏等优势得到各方面的广泛关注和快速发展。介绍了植物监测的原理和优势,并综述了近几年植物监测大气污染的发展趋势。