TGM measurements on board ships have proved to provide valuable complementary information to measurements by a ground based monitoring network.During the third China Arctic Research Expedition （from July 11 to Septem...TGM measurements on board ships have proved to provide valuable complementary information to measurements by a ground based monitoring network.During the third China Arctic Research Expedition （from July 11 to September 24,2008）,TGM concentrations over the marine boundary layer along the cruise path were in-situ measured using an automatic mercury vapor analyzer.Here we firstly reported the results in Japan Sea,North Western Pacific Ocean and Bering Sea,where there are rare reports.The value ranged between 0.30 and 6.02 ng/m 3 with an average of （1.52 ± 0.68） ng/m 3 ,being slightly lower than the background value of Northern Hemisphere （1.7 ng/m 3 ）.Notably TGM showed considerably spatial and temporal variation.Geographically,the average value of TGM in Bering Sea was higher than those observed in Japan Sea and North Western Pacific Ocean.In the north of Japan Sea TGM levels were found to be lower than 0.5 ng/m 3 during forward cruise and displayed obviously diurnal cycle,indicating potential oxidation of gaseous mercury in the atmosphere.The pronounced episode was recorded as well.Enhanced levels of TGM were observed in the coastal regions of southern Japan Sea during backward cruise due primarily to air masses transported from the adjacent mainland reflecting the contribution from anthropogenic sources.When ship returned back and passed through Kamchatka Peninsula TGM increased by the potential contamination from volcano emissions.展开更多
采用原子荧光法对固定污染源废气中气态总汞进行了测定,并对仪器实验条件进行了试验筛选。在选定的仪器实验条件下,即光电倍增管负高压为230 V、灯电流为15 m A、KBH4浓度为0.5%,载流浓度为5%,汞的质量浓度在1.00~20.0μg/L范围内与荧...采用原子荧光法对固定污染源废气中气态总汞进行了测定,并对仪器实验条件进行了试验筛选。在选定的仪器实验条件下,即光电倍增管负高压为230 V、灯电流为15 m A、KBH4浓度为0.5%,载流浓度为5%,汞的质量浓度在1.00~20.0μg/L范围内与荧光强度值呈较好的线性关系,相关系数为0.9998;方法检出限为0.108μg/L,测定下限为0.432μg/L;标准样品测定结果均在保证值范围内,相对误差范围为0.47%~5.20%,相对标准偏差RSD%范围为0.73%~5.83%;实际样品测试数据经t检验统计分析,结果显示该方法与标准测定方法的测试结果间无显著差异,且高度相关。展开更多
基金supported by the National Natural Science Foundation of China (No.41025020,40776001)the Knowledge Innovation Project of the Chinese Academy of Sciences (No.KZCX2-YW-QN506)+2 种基金the Funda-mental Research Funds for the Central Universitiessupported by the International Polar Year Project from China ArcticAntarctic Administration and performed during the third China Arctic Research Expedition
文摘TGM measurements on board ships have proved to provide valuable complementary information to measurements by a ground based monitoring network.During the third China Arctic Research Expedition （from July 11 to September 24,2008）,TGM concentrations over the marine boundary layer along the cruise path were in-situ measured using an automatic mercury vapor analyzer.Here we firstly reported the results in Japan Sea,North Western Pacific Ocean and Bering Sea,where there are rare reports.The value ranged between 0.30 and 6.02 ng/m 3 with an average of （1.52 ± 0.68） ng/m 3 ,being slightly lower than the background value of Northern Hemisphere （1.7 ng/m 3 ）.Notably TGM showed considerably spatial and temporal variation.Geographically,the average value of TGM in Bering Sea was higher than those observed in Japan Sea and North Western Pacific Ocean.In the north of Japan Sea TGM levels were found to be lower than 0.5 ng/m 3 during forward cruise and displayed obviously diurnal cycle,indicating potential oxidation of gaseous mercury in the atmosphere.The pronounced episode was recorded as well.Enhanced levels of TGM were observed in the coastal regions of southern Japan Sea during backward cruise due primarily to air masses transported from the adjacent mainland reflecting the contribution from anthropogenic sources.When ship returned back and passed through Kamchatka Peninsula TGM increased by the potential contamination from volcano emissions.
文摘采用原子荧光法对固定污染源废气中气态总汞进行了测定,并对仪器实验条件进行了试验筛选。在选定的仪器实验条件下,即光电倍增管负高压为230 V、灯电流为15 m A、KBH4浓度为0.5%,载流浓度为5%,汞的质量浓度在1.00~20.0μg/L范围内与荧光强度值呈较好的线性关系,相关系数为0.9998;方法检出限为0.108μg/L,测定下限为0.432μg/L;标准样品测定结果均在保证值范围内,相对误差范围为0.47%~5.20%,相对标准偏差RSD%范围为0.73%~5.83%;实际样品测试数据经t检验统计分析,结果显示该方法与标准测定方法的测试结果间无显著差异,且高度相关。
