关键词: 闽江, 沉积物, 硫化物, 重金属, Minjiang River, sediments, acid-volatile sulfide, heavy metals

Abstract: Based on the data from seven sampling stations of surface sediments in 2012 and 2013, the acid volatile sulfide（AVS）, total organic carbon and heavy metals in Minjiang River basin were studied. The results indicated that the average concentrations of acid volatile sulfide ranged from 0.4610 ~ 1.8140 μmol?g-1, the average contents of total organic carbon varied between 0.76 % ~ 1.51 %. The contents of acid volatile sulfide and corresponding total organic carbon in S5 station of Youxi were significantly higher than other stations due to the influence from human activity. In comparison, the content of acid volatile sulfide in S7 station of Minjiang mainstream was the lowest, which was mainly affected by hydrodynamic characteristics. The content and variation of acid volatile sulfide were affected by many factors, so the regularity of spatial distribution was not significant. It was found that the metal concentrations were in the order of Cu＞Pb＞As＞Hg＞Cd. Among heavy metals, Cu and Pb were the dominating species. The simultaneous extracted metals（SEM）average values ranged from 0.47 ~ 3.58 μmol?g-1. By comparing the ratio of SEM to AVS, the values of all stations were greater than one except S2 and S6, which had high bioavailability and potential biotoxicity. Compared with the threshold of toxic effects of metal elements in water sediments on benthic organisms, the bio-availability of Pb and Cd was higher than Cu in the single heavy metal, which had the potential to produce toxic effect on benthic organisms.