Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China; School of Environment, Nanjing Normal University, Nanjing, 210023, China.
Environ Pollut. 2021 Jan 15;269:116096. doi: 10.1016/j.envpol.2020.116096. Epub 2020 Nov 18.
Phthalate pollution in soil and vegetables in plastic agricultural greenhouses has attracted wide concern. Investigating airborne phthalates in this environment can improve understanding of air-soil or air-vegetable phthalate migration. However, studies of phthalates in plastic agricultural greenhouse air are rare. To fill this gap, 25 gas-phase and 23 particle-phase samples were collected from 12 typical plastic greenhouses in Shaanxi. 16 types of phthalates were measured by a gas chromatography-mass spectrometry system (GC-MS) to analyse their pollution features and variations. Results showed that in the air of the plastic greenhouses, the median concentration of the sum of sixteen type phthalates (∑ phthalates) was 5305 ng m, with 5th-95th value of 1214-9616 ng m. Phthalates in gas-phase samples were over 100 times higher than the levels in particle-phase samples. Air phthalate concentrations in the plastic greenhouses were higher than those in the control groups (P < 0.05). Air bis (2-ethylhexyl) phthalate (DEHP) and di-n-butyl phthalate (DnBP) accounted for 66.9% and 29.3% of total ∑ phthalate concentrations, respectively. Air phthalate concentrations in the plastic greenhouses in winter were 1.1-5.3 times higher than the levels in summer respectively (P < 0.05). Gas-particle partition coefficients (K) values of DEHP in summer (median of 1.52 × 10 m μg) were higher than K values of DnBP in summer (0.60 × 10 m μg). Log-transformed K values of DnBP and DEHP were linear correlated to the reciprocal of air temperatures, respectively (P < 0.05).
土壤和塑料温室蔬菜中的邻苯二甲酸酯污染引起了广泛关注。研究这种环境中的空气邻苯二甲酸酯可以提高对空气-土壤或空气-蔬菜中邻苯二甲酸酯迁移的理解。然而，对塑料温室空气中邻苯二甲酸酯的研究很少。为了填补这一空白，从陕西 12 个典型的塑料温室中采集了 25 个气相和 23 个颗粒相样品。使用气相色谱-质谱联用系统（GC-MS）测量了 16 种邻苯二甲酸酯，以分析其污染特征和变化。结果表明，在塑料温室空气中，16 种邻苯二甲酸酯总量（∑邻苯二甲酸酯）的中位数浓度为 5305ng/m，第 5 至第 95 百分位数浓度为 1214-9616ng/m。气相样品中的邻苯二甲酸酯浓度是颗粒相样品的 100 多倍。塑料温室空气中的邻苯二甲酸酯浓度高于对照组（P<0.05）。双（2-乙基己基）邻苯二甲酸酯（DEHP）和邻苯二甲酸二正丁酯（DnBP）分别占总∑邻苯二甲酸酯浓度的 66.9%和 29.3%。塑料温室冬季空气中的邻苯二甲酸酯浓度分别比夏季高 1.1-5.3 倍（P<0.05）。夏季 DEHP 的气-粒分配系数（K）值（中位数为 1.52×10mμg）高于夏季 DnBP 的 K 值（0.60×10mμg）。对数转换后的 DnBP 和 DEHP 的 K 值与空气温度的倒数呈线性相关（P<0.05）。
