摘要
本研究揭示了酞酸酯类增塑剂邻苯二甲酸二丁酯（ＤＢＰ）和邻苯二甲酸二异辛酯（ＤＥＨＰ）在土壤中的持留动态、降解动力学特征及其对作物生长的影响。结果表明：试验温度越低，ＤＢＰ，ＤＥＨＰ的持留性越强：ＤＥＨＰ在土壤中的持留性受温度的影响程度比ＤＢＰ更为突出。随土壤水份含量增加，供试物持留性降低。二者在土壤中的降解可用一级反应动力学方程Ｃ＝Ｃ０ｅ－ｋｔ进行描述（Ｃ０初始浓度，ｋ速度常数，ｔ时间）。ＤＥＨＰ的降解速率受环境因素的影响较为明显；ＤＢＰ的降解不仅稍快于ＤＥＨＰ，而且受环境因素的影响程度相对较小。研究结果还显示：土壤微生物活性对ＤＢＰ，ＤＥＨＰ在土壤中的降解有重大作用，土壤微生物活性的提高，将促进供试物的迅速降解，有助于减少供试物对土壤的污染。田间小区施药试验结果表明：高剂量处理对供试蔬菜在幼苗期生长有一定的障碍作用，ＤＢＰ对作物生长的影响比ＤＥＨＰ更为突出。同时还发现ＤＢＰ，ＤＥＨＰ对蔬菜产量有一定影响，并使部分品种蔬菜可食部位的Ｖｃ含量降低。
The effect of
persistence, degradation dynamics of DBP (Dibutyl phthalate) andDEHP (di(2-ethylhexyl)
phthalate) on corp growth were studied in this work. Resultsshowed that DBP and DEHP
remainede in soil increased with experimental temperatureraised, especially for DEHP. The
remained amount of pathalate plasticizers decreasedwith the increase of soil water content. The
degradation of these two chemicals in thesoil can be described by the the first order kinetic
equation of C= C0e-kt. Thedegradation of DEHP was strongly affected by environmental factors.
Although DBPdegraded faster than DEHP, the dependence of its degradation in soil
onenvironmental fators was much smaller than that of DEHP.Results also indicated that the
activities of soil micro organisms played a veryimportant role in PAEs degradation in soil.
Increase in activities of soilmicro-organisms would accelerate the PAEs degradation rates and
reduce the pollutionof PAEs to soils.Results of field experiment with these two chemicals
showed that a high dose ofthem restricted the growth of vegetable to some extent especially for
DBP. Meanwhile,it was also concluded that DBP and DEHP decreased the vegetable yield
slightly andreduced the Vc contents of eatable parts of vegetables.
出处
《土壤学报》
CAS
CSCD
北大核心
1999年第1期118-126,共9页
Acta Pedologica Sinica
基金
江苏省自然科学基金
关键词
增塑剂
土壤-作物系统
持留动态
降解动力学
Plasticizer,
Soil-crop system, DBP (Dibutyl phthalate), DEHP(di(2-ethylhexyl) phthalate), Persistence
dynamics, Degradation kinetics
