| 中山市农业区域土壤-农产品中邻苯二甲酸酯(PAEs)污染特征 |
| 摘要点击 2234 全文点击 1516 投稿时间：2014-10-05 修订日期：2015-01-09 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 邻苯二甲酸酯 农业土壤-农产品 污染水平 生物富集 中山市 |
| 英文关键词 phthalic acid esters (PAEs) agricultural soil-products pollution level bioconcentration Zhongshan City |
|
| 中文摘要 |
| 在广东省中山市农业区域范围内共采集了65个表层土样和37个农产品样品,采用GC-FID检测方法分析了土壤和农产品样品中被美国环境保护署(EPA)优先控制的6种邻苯二甲酸酯(PAEs)化合物含量,并对其污染水平、污染程度进行了评价. 结果表明,中山市农业土壤样品中6种PAEs化合物总浓度(ΣPAEs)范围为0.14~1.14mg·kg-1,平均含量为0.43 mg·kg-1,检出率为100%. 不同土地利用类型中土壤的ΣPAEs含量大小顺序依次为菜地 >果园地 >稻田. 与美国土壤6种优控的PAEs控制标准相比,邻苯二甲酸二正丁酯(DBP)和邻苯二甲酸二甲酯(DMP)含量超过控制标准,超标率分别为93.85%和27.69%,其余4种优控PAEs化合物的含量均低于美国标准. 总体上,中山市农业土壤中ΣPAEs含量处于较低水平. 中山市农产品中ΣPAEs含量范围为0.15~3.15 mg·kg-1,平均含量1.12 mg·kg-1,蔬菜中ΣPAEs的含量高于水稻和水果. 农产品中PAEs含量低于美国和欧洲食品建议指标,健康风险很小. DBP和DEHP在土壤、农产品中占ΣPAEs的百分比和检出率均较高,是中山市PAEs污染物的主要组成部分. 不同种类农产品-土壤中的ΣPAEs、DBP存在显著正相关,其中蔬菜-菜田土壤的Pearson相关系数(r)分别为0.81(P=0.000)、0.75 (P=0.000),水稻-稻田土壤中二者的r分别为0.74(P=0.036)、0.65(P=0.041),水果-果园土壤中相关系数分别为0.66(P=0.029)、0.78 (P=0.045). 不同农产品对土壤中6种PAEs化合物的累积能力存在明显差异,但对ΣPAEs总量的富集系数均大于1. 因此,在农业区域土壤质量评价过程中,应重视农产品自身特性对PAEs吸收和累积的影响. |
| 英文摘要 |
| In order to investigate and assess the pollution level of phthalic acid esters (PAEs) in farm soils and products from typical agricultural fields in areas of Zhongshan City, Guangdong Province, South China, 65 topsoil and 37 agricultural product samples were collected and contents of 6 PAEs compounds that classified by the U.S. Environmental Protection Agency (EPA) as priority pollutants were determined by the GC-FID. The results indicated that total contents of the PAEs (ΣPAEs) in soils ranged from 0.14 to 1.14 mg·kg-1, and the mean value was 0.43 mg·kg-1, with the detected ratio of 100%.Various concentrations of PAEs differed in three land-use types were ordered by vegetable soil >orchard soil >paddy soil. Comparing with six U.S. EPA priority pollutants of PAEs, the contents of Di-n-butyl phthalate (DBP) and Dimethyl phthalate (DMP) in soils exceeded the control limits of PAEs in the American soil by 93.85% and 27.69% respectively, but the rest four PAEs compounds were lower than the control limits. Generally, the pollution level of soils contaminated by PAEs in agricultural fields of Zhongshan City was relatively low. The contents of ΣPAEs in agricultural products ranged from 0.15 to 3.15 mg·kg-1 with the average of 1.12 mg·kg-1, which was lower than the suggested standards in USA and Europe and with low health risk. Meanwhile, ΣPAEs concentrations in vegetables were higher than those both in rice and fruits. DBP and DEHP were the main components of PAEs both in agricultural soils and products, with higher percentage contents and detected ratio. ΣPAEs and DBP contents in various agricultural products-soils had a significantly positive correlation, with Pearson coefficients (r) in vegetables-vegetable soils were 0.81(P=0.000), 0.75(P=0.000), and corresponding r among rice-paddy soil and fruits-fruit soils were 0.74(P=0.036), 0.65(P=0.041) and 0.66(P=0.029), 0.78(P=0.045), respectively. Although there existed a significant difference for single PAEs compound accumulated by agricultural products, the ΣPAEs bioconcentration factors of all agricultural products were above 1. Therefore, the accumulation characteristics of PAEs should be fully concerned when farm soil quality assessment is taken. |
|
|
|
