Department of Chemistry, University of Life Sciences, Akademicka 13, 20‐950 Lublin, Poland.
Sci Total Environ. 2012 Oct 1;435-436:222-9. doi: 10.1016/j.scitotenv.2012.07.013. Epub 2012 Jul 31.
The study aimed to determine the influence of pH on the adsorption of carbendazim in soil profiles of three mineral agricultural soils: Hyperdystric Arenosol, Haplic Luvisol and Hypereutric Cambisol. In the examined pH range between 3 and 7 the adsorption of carbendazim was inversely correlated to the pH of the soil. The adsorption coefficients were in the range between 0.3 and 151.8 m Lg(-1). Decreasing the pH in the soil suspensions from 7 to 3 increased the value of this coefficient by 3 to 70 times. A decrease in the amounts of organic matter down the soil profiles was not associated with weaker carbendazim adsorption. In the samples from all soil horizons, at pH values between 3 and 6, the predominant sorption process was carbendazim adsorption on clay minerals. The adsorption of carbendazim on organic matter prevailed over that on clays only at pH>6 and only in the Ap horizon of the examined soils. The developed mathematical models yielded very good results when the adsorption of the protonated form of carbendazim was assumed to be the predominant adsorption process on clays together with the adsorption of neutral molecules on organic matter and clays. The results from both the model fitting and the experiments revealed the negative effect of Al oxides and hydroxides and Al cations on the adsorption of the protonated form of carbendazim on clay minerals. The developed models successfully described the pH-dependent adsorption processes of carbendazim for both data from particular soil horizons and those from all three examined soil profiles.
本研究旨在确定 pH 值对三种矿物农业土壤（富铝质变性土、淡色草甸土和高潜育性淡色灰化土）剖面中多菌灵吸附的影响。在所研究的 pH 值范围（3-7）内，多菌灵的吸附与土壤 pH 值呈反比。吸附系数在 0.3-151.8 m L/g 之间。将土壤悬浮液的 pH 值从 7 降低到 3，会使该系数增加 3 到 70 倍。土壤剖面中有机质含量的减少与多菌灵吸附减弱无关。在所有土壤层次的样本中，在 pH 值为 3-6 之间，主要的吸附过程是多菌灵在粘土矿物上的吸附。只有在 pH 值大于 6 时，多菌灵在有机物上的吸附才会超过在粘土矿物上的吸附，而且仅在被研究土壤的 Ap 层中存在这种情况。所开发的数学模型在假设质子化多菌灵的吸附是粘土矿物上的主要吸附过程，同时假设中性分子在有机物和粘土上的吸附也是主要吸附过程时，得到了非常好的结果。模型拟合和实验结果都表明了 Al 氧化物和氢氧化物以及 Al 阳离子对质子化多菌灵在粘土矿物上吸附的负面影响。所开发的模型成功地描述了多菌灵在 pH 值依赖性吸附过程中的数据，这些数据来自特定的土壤层次以及三个被研究的土壤剖面。
