佛蒙特州学校建筑材料中的多双广泛排放
Jason B X Hua1, Rachel F Marek1, Michael P Jones2
1Department of Civil and Environmental Engineering, IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, Iowa 52242, United States.
Environmental science & technology
|February 3, 2026
概括
佛蒙特州老年学校建筑材料排放的多二 (PCB) 构成暴露风险. 这项研究测量了PCB排放和空气度,确定了密封剂和防火等材料作为重要来源.
科学领域:
- 环境科学 环境科学
- 职业健康 职业健康 职业健康
- 建筑科学 建筑科学
背景情况:
- 在被禁止之前,多双 (PCB) 在建筑材料中被广泛使用.
- PCB可以从材料中排出气体,导致室内空气污染.
- 1980年之前建造的学校可能含有含有PCB的材料,对健康构成风险.
研究的目的:
- 测量佛蒙特州学校室内室内表面的多二 (PCB) 排放量.
- 识别特定的建筑材料,这些建筑材料是空气中的PCB的重要来源.
- 评估学校工作人员因接触PCB而面临的潜在癌症风险.
主要方法:
- 在1980年之前建造的16所佛蒙特学校 (98个房间) 进行了大规模研究.
- 同时部署空气和表面排放采样器来测量PCB水平.
- 分析了空气中的PCB同源度和各种建筑材料的排放.
主要成果:
- 观察到各种各样的PCB空气度 (1.75700 ng m−3) 和表面排放 (33830,000 ng m−2 d−1).
- 来自膨胀接头密封剂,玻璃块窗和防火涂层的排放对空气中的PCB有很大影响.
- 学校工作人员估计的过度终身癌症风险超过了该州的目标风险水平.
结论:
- 1980年以前建筑材料中的PCB仍然是学校室内暴露的来源.
- 密封剂和防火材料等特定材料是高排放的来源.
- 研究结果强调,需要管理含有PCB的材料,以保护乘客,特别是儿童.
相关概念视频
Emission Spectra
76.4K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
76.4K
Movement Joints in Buildings
350
Movement joints in buildings are essential design elements that accommodate inevitable motions caused by various factors such as temperature changes, moisture content variations, and structural deflections. These motions, if not considered in design and construction, can lead to unsightly or dangerous damage. Movement joints are incorporated in different forms to manage these stresses and allow materials to move without causing distress.
The simplest type of movement joints, working joints, are...
The simplest type of movement joints, working joints, are...
350
Types of Building Stone
448
Building stones, essential materials for construction, are extracted from natural rock deposits and processed into specific forms and dimensions suitable for various building applications. These stones are broadly classified into three types based on their geological formation: igneous, sedimentary, and metamorphic.
Igneous rocks are formed from the solidification of magma or lava. An example is granite, known for its durability and resistance to weathering, making it ideal for parts of...
Igneous rocks are formed from the solidification of magma or lava. An example is granite, known for its durability and resistance to weathering, making it ideal for parts of...
448
Members Made of Elastoplastic Material
402
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
402
Genetic Material
3.8K
Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.
3.8K
Bending of Members Made of Several Materials
615
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
615


