College of Natural Resources and Environment, Northwest A&F University, No. 3 Taicheng Road, Yangling, 712100, Shaanxi, China.
State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, No. 3 Taicheng Road, Yangling, 712100, Shaanxi, China.
Environ Sci Pollut Res Int. 2021 Jun;28(22):27844-27851. doi: 10.1007/s11356-021-12406-x. Epub 2021 Jan 30.
The application of plastic film in field crop production elevated the phthalate esters (PAEs) accumulation in wheat grains, which poses potential risks to human health. However, the variation of grain PAEs contents in different dryland areas is not clear, and the distribution of PAEs in different tissues of grains has not been studied yet. In the present study, field experiments in five sites (three provinces) with two treatments (soil with and without film mulching) were carried out to study the concentration and distribution of PAEs in grains and the effects of environmental factors on them. Results showed that the total PAE concentration (∑PAEs) in wheat grains ranged from 445 to 764 μg/kg, mainly in the forms of di-(2-ethylhexyl)-phthalate (DEHP), dibutyl phthalate (DBP), and diisobutyl phthalate (DIBP). Compared with control, total PAE concentrations in soils and wheat grains were significantly higher in treatments with film mulching. The effects of film on the proportion of PAEs in the flour and bran varied with experiment sites. Grain PAEs in the control groups presented significantly negative correlation with annual temperature, while there was a positive correlation between soil PAEs and bran PAEs in the film treatment. Results in this study are of great significance to comprehensively evaluate the effect of film mulching on grain safety in dryland wheat production.
塑料薄膜在大田作物生产中的应用提高了小麦籽粒中邻苯二甲酸酯（PAEs）的积累，这对人类健康构成了潜在风险。然而，不同旱地地区的籽粒 PAEs 含量变化尚不清楚，而且 PAEs 在籽粒不同组织中的分布也尚未研究。本研究在五个地点（三个省份）进行了田间试验，采用两种处理（覆膜土壤和无膜土壤），研究了 PAEs 在籽粒中的浓度和分布，以及环境因素对其的影响。结果表明，小麦籽粒中总 PAE 浓度（∑PAEs）范围为 445-764μg/kg，主要以邻苯二甲酸二（2-乙基己基）酯（DEHP）、邻苯二甲酸二丁酯（DBP）和邻苯二甲酸二异丁酯（DIBP）的形式存在。与对照相比，覆膜处理的土壤和小麦籽粒中总 PAE 浓度显著升高。覆膜对面粉和麸皮中 PAEs 比例的影响因试验地点而异。对照组中，籽粒 PAEs 与年平均温度呈显著负相关，而覆膜处理中土壤 PAEs 与麸皮 PAEs 呈正相关。本研究结果对全面评估旱地小麦生产中覆膜对粮食安全的影响具有重要意义。
