Influence of Temperature on the Emission of Di-(2-ethylhexyl)phthalate (DEHP) from PVC Flooring in the Emission Cell FLEC
Influence of Temperature on the Emission of Di-(2-ethylhexyl)phthalate (DEHP) from PVC Flooring in the Emission Cell FLEC
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DOI：
10.1021/es2035625
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发表时间：
2012-01-17
影响因子：
11.4
通讯作者：
Wolkoff, Peder
中科院分区：
文献类型：
--
作者：
Clausen, Per Axel;Liu, Zhe;Wolkoff, Peder
在现场和实验室排放单元（FLEC）中测量了一种聚氯乙烯（PVC）地板（含约13%（w/w）DEHP作为增塑剂）的邻苯二甲酸二（2-乙基己基）酯（DEHP）排放。在空气流速为450 mL.min（-1）和五种不同温度（23 ℃、35 ℃、47 ℃、55 ℃和61 ℃）下测量DEHP的气相浓度与时间的关系。在达到稳态后两周到三个月终止实验，用甲醇冲洗FLEC的内表面以测定DEHP的表面浓度。最重要的发现是：（1）DEHP稳态浓度随温度升高而显著增加（分别为0.9 +/- 0.1 μ g.m（-3）、10 +/- 1 μ g.m（-3）、38 +/- 1 μ g.m（-3）、91 +/- 4 μ g.m（-3）和198 +/- 5 μ g.m-3），（2）随着温度的升高，吸附在室壁上的量大大减少（FLEC空气和内表面之间的实测分配系数为：分别为640 +/- 146 m、97 +/- 20 m、21 +/- 5 m、11 +/- 2 m和2 +/- 1 m），（3）与乙烯基地板表面平衡的气相DEHP浓度接近纯DEHP的蒸汽压，以及（4）随着家庭温度从23摄氏度增加到35摄氏度，预计气相和颗粒相的DEHP含量将增加近10倍。气相中的量增加了24倍，而空气中悬浮颗粒的量相应减少。
Emissions of di-(2-ethylhexyl) phthalate (DEHP) from one type of polyvinylchloride (PVC) flooring with approximately 13% (w/w) DEHP as plasticizer were measured in the Field and Laboratory Emission Cell (FLEC). The gas-phase concentrations of DEHP versus time were measured at air flow rate of 450 mL.min(-1) and five different temperatures: 23 degrees C, 35 degrees C, 47 degrees C, 55 degrees C, and 61 degrees C. The experiments were terminated two weeks to three months after steady-state was reached and the interior surface of the FLECs was rinsed with methanol to determine the surface concentration of DEHP. The most important findings are (1) DEHP steady-state concentrations increased greatly with increasing temperature (0.9 +/- 0.1 mu g.m(-3), 10 +/- 1 mu g.m(-3), 38 +/- 1 mu g.m(-3), 91 +/- 4 mu g.m(-3), and 198 +/- 5 mu g.m-3, respectively), (2) adsorption to the chamber walls decreased greatly with increasing temperature (measured partition coefficient between FLEC air and interior surface are: 640 +/- 146 m, 97 +/- 20 m, 21 +/- 5 m, 11 +/- 2 m, and 2 +/- 1 m, respectively), (3) gas-phase DEHP concentration in equilibrium with the vinyl flooring surface is close to the vapor pressure of pure DEHP, and (4) with an increase of temperature in a home from 23 to 35 degrees C, the amount of DEHP in the gas- and particle-phase combined is predicted to increase almost 10-fold. The amount in the gas-phase increases by a factor of 24 with a corresponding decrease in the amount on the airborne particles.