Department of Chemistry and Biochemistry, Mendel University in Brno, Czech Republic.
Anal Chim Acta. 2014 Mar 28;819:42-8. doi: 10.1016/j.aca.2014.02.013. Epub 2014 Feb 12.
The diffusive gradients in thin films (DGT) technique, utilizing resin gel with ion-exchange resin Duolite GT73 and new ion-exchange resin Ambersep GT74, was investigated for the accumulation of four mercury species (Hg(2+), CH3Hg(+), C2H5Hg(+), C6H5Hg(+)). The diffusion coefficients of mercury species in agarose gel calculated on the basis of Fick's Law were mercury species-specific. The diffusion coefficients of Hg(2+) and CH3Hg(+) at 25 °C (9.07±0.23×10(-6) cm(2) s(-1) and 9.06±0.30×10(-6) cm(2) s(-1), respectively) were very similar, but the diffusion coefficients of C2H5Hg(+) (6.87±0.23×10(-6) cm(2) s(-1)) and C6H5Hg(+) (3.86±0.19×10(-6) cm(2) s(-1)) were significantly lower. Influence of experimental conditions (pH, selected cations, chlorides and humic substance) on mercury species accumulation by DGT was studied. The DGT technique was applied to river water spiked with mercury species.
利用含有离子交换树脂 Duolite GT73 和新型离子交换树脂 Ambersep GT74 的树脂凝胶，研究了薄膜扩散梯度（DGT）技术对四种汞形态（Hg(2+)、CH3Hg(+)、C2H5Hg(+)、C6H5Hg(+)）的积累作用。根据菲克定律计算出的琼脂糖凝胶中汞形态的扩散系数具有汞形态特异性。25°C 时 Hg(2+)和 CH3Hg(+)的扩散系数（分别为 9.07±0.23×10(-6)cm(2)s(-1)和 9.06±0.30×10(-6)cm(2)s(-1)）非常相似，但 C2H5Hg(+)（6.87±0.23×10(-6)cm(2)s(-1)）和 C6H5Hg(+)（3.86±0.19×10(-6)cm(2)s(-1)）的扩散系数明显较低。研究了实验条件（pH、选择的阳离子、氯化物和腐殖质）对 DGT 中汞形态积累的影响。DGT 技术被应用于添加了汞形态的河水。
