论文部分内容阅读
目的研究北京设施农业蔬菜中的邻苯二甲酸酯类(phthalic acid ester,PAEs)的污染水平,分析北京设施农业蔬菜中PAEs污染物特征。方法采集北京市昌平区、延庆区和顺义区的8个典型设施蔬菜基地16份蔬菜样品,利用超声提取、固相萃取柱净化、内标法定量,气相色谱质谱联用技术分析蔬菜中15种PAEs。结果在分析的蔬菜样品中均检测出PAEs,15种PAEs总浓度(∑PAEs)为0.15~6.94 mg/kg,平均含量为4.91 mg/kg。蔬菜中PAEs的单体分布相似,其中以邻苯二甲酸(2-乙基)己酯(DEHP)含量最高,占∑PAEs的36.9%,邻苯二甲酸二丁酯(DBP)和邻苯二甲酸二异丁酯(DIBP)含量次之,分别占∑PAEs的33.5%和19.2%。结论设施蔬菜基地地膜的使用导致PAEs存在于各类蔬菜,蔬菜中的PAEs残留量应引起重视。
Objective To study the pollution levels of phthalic acid esters (PAEs) in agricultural facilities in Beijing and analyze the characteristics of PAEs in agricultural facilities in Beijing. Methods Sixteen vegetable samples from 8 typical vegetable bases in Changping District, Yanqing District and Shunyi District of Beijing were collected. Fifteen vegetable samples were collected and analyzed by ultrasonic extraction, solid phase extraction (SPE) column, quantitative analysis by internal standard method and gas chromatography-mass spectrometry PAEs. Results PAEs were detected in all the analyzed vegetable samples. The total concentrations of 15 PAEs (ΣPAEs) were 0.15-6.94 mg / kg and the average contents were 4.91 mg / kg. The monomer distribution of PAEs in vegetables is similar, with the content of DEHP being the highest (36.9% of ΣPAEs), dibutyl phthalate (DBP) and phthalate Diisobutyl formate (DIBP) followed by 33.5% and 19.2% of ΣPAEs, respectively. Conclusion The use of mulch at the base of vegetable facilities has led to the fact that residues of PAEs present in all kinds of vegetables and vegetables should be taken into account.