There are few studies on the simultaneous behavior of chromium (Cr), molybdenum (Mo), and tungsten (W) belonging to group VIB of the periodic table. Herein, based on high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) technology, the vertical distribution characteristics of DGT-labile and soluble Cr, Mo, and W in two lakes of Nansi Lake (Weishan Lake and Dushan Lake) were analyzed. In addition, the net diffusion fluxes and R-value (C_DGT/C_sol) were used to evaluate the mobility and release risk of metals at the sediment-water interface. The results showed that the DGT-labile concentrations of the three metal elements (Cr, Mo, and W) in Weishan Lake were higher than those in Dushan Lake, both in overlying water and sediment. This is mainly due to the dredging of the Dushan Lake area, which can permanently remove the polluted sediment in the lake. Meanwhile, the exogenous input is relatively high near the tourist area of Weishan Island. The net diffusion fluxes indicate that the W has a potential release risk of diffusion to the overlying water in Dushan Lake. The release of Cr, Mo, and W is thought to be related to the reductive dissolution of Fe/Mn (hydr)oxides based on Pearson correlation coefficients. The R-values of Cr and W indicate that Cr and W belong to the partial continuity case. The R-value of Mo was lower than the minimum value, meaning that Mo belongs to the single diffusion type and it is difficult for Mo sediments to supply pore water.

对于元素周期表中第 VIB 族的铬 (Cr)、钼 (Mo) 和钨 (W) 的同时行为的研究很少。本文基于高分辨率透析（HR-Peeper）和薄膜扩散梯度（DGT）技术，研究了南四湖两个湖泊（微山湖和微山湖）中DGT不稳定和可溶性Cr、Mo和W的垂直分布特征。独山湖）进行了分析。此外，净扩散通量和R值（C _DGT /C _sol）用于评估沉积物-水界面处金属的迁移性和释放风险。结果表明，微山湖上覆水体和沉积物中Cr、Mo、W 3种金属元素的DGT不稳定浓度均高于独山湖。这主要得益于独山湖区域的疏浚，可以永久清除湖中受污染的沉积物。同时，微山岛旅游区附近外源投入较高。净扩散通量表明W具有向独山湖上覆水体扩散的潜在释放风险。根据皮尔逊相关系数，Cr、Mo 和 W 的释放被认为与 Fe/Mn（氢）氧化物的还原溶解有关。Cr和W的R值表明Cr和W属于部分连续情况。Mo的R值低于最小值，说明Mo属于单一扩散型，Mo沉积物难以供给孔隙水。