CAJ | 학술논문

为了了解北江沉积物中汞污染现状、来源并评价其污染程度,在北江流域共采集19个沉积物样,用原子吸收法(AAS)和冷原子荧光法(CVAFS)分别测定了其总汞(THg)和甲基汞(MeHg)含量,比较了甲基化率,并用污染指数法对测定结果进行了评价.结果表明,北江沉积物THg含量为73.7～3 517 ng·g~(-1)(干重),均值为607.6 ng·g~(-1),MeHg含量为0.392～2.384ng·g~(-1),均值为1.302 ng·g~(-1),韶关冶炼厂为重要污染点源.各采样点甲基化率差异较大,进一步研究影响甲基化的因素具有重要意义.沉积物中THg、MeHg平均污染指数分别为3.04、26.04,表明均为中度污染.
위료료해북강침적물중홍오염현상、래원병평개기오염정도,재북강류역공채집19개침적물양,용원자흡수법(AAS)화랭원자형광법(CVAFS)분별측정료기총홍(THg)화갑기홍(MeHg)함량,비교료갑기화솔,병용오염지수법대측정결과진행료평개.결과표명,북강침적물THg함량위73.7～3 517 ng·g~(-1)(간중),균치위607.6 ng·g~(-1),MeHg함량위0.392～2.384ng·g~(-1),균치위1.302 ng·g~(-1),소관야련엄위중요오염점원.각채양점갑기화솔차이교대,진일보연구영향갑기화적인소구유중요의의.침적물중THg、MeHg평균오염지수분별위3.04、26.04,표명균위중도오염.
Mercury in environment has become the major concem in recent years due to its highly toxic to human and biota. In this study, nineteen sediment samples were coUected along the Beijiang River to examine concentrations and sources of mercury, as well as methylmer-cury. Also,the pollution levels of mercury and its compound were assessed based on comparison with other studies. Total mercury (THg) and methylmercury (MeHg) were determined by atomic absorption spectroscopy (AAS) and cold vapor atomic fluorescence spectrometers (CVAFS), respectively. Furthermore,methylation rates were calculated for all samples and pollution degrees of mercury in sediment were e-valuated using pollution index methods. The results showed that THg concentrations in sediments ranged from 73.7 to 3 517 ng·g~(-1) dry weight, with an average of 607.6 ng·g~(-1), and MeHg concentrations ranged from 0.392 to 2.384 ng.g-l tky weight with an average of 1.302 ng·g~(-1), respectively. Clearly, wastewater from Shaoguan smelting factory was an important point source for mercury in sediment. In addition, methylation rates varied significantly among samples, suggesting that factors influencing methylation is still unclear. Thus, more studies are needed to explore the relationships between these important factors and methylation rates of mercury in sediment. Based on the average pol-lution index of THg(F=3.04) and MeHg(F=26.04) in sediment. the Beijiang River suffered from medium pollution of THg and MeHg.