An off-line chelation system combined with ICP-MS technique was developed for the quantitative determination of trace elements in seawater,namely V,Co,Ni,Cu,Zn,Mo,Cd,Pb,U and rare earth elements（REEs）.The system was...An off-line chelation system combined with ICP-MS technique was developed for the quantitative determination of trace elements in seawater,namely V,Co,Ni,Cu,Zn,Mo,Cd,Pb,U and rare earth elements（REEs）.The system was built based on an ion chromatography equipped with MetPac CC-1 chelation columns which had a strong selective chelation to these target elements within a pH range 5.2—5.6.Acidified seawater samples and NH4Ac（2 mol/L） were blended to meet suitable pH before being injected into the chelation column,thus target elements were retained while alkali and alkaline metals were excluded.Then chelated elements were eluted by HNO3（1 mol/L） and samples were collected for ICP-MS analysis.Varying the ratio of input（gen.200 mL） to output（gen.5 mL）,the target elements which were concentrated as 40 times as their concentrations were far beyond instrumental quantification limits.At last,a certificated seawater CASS-4 was introduced and our detected values were in good agreement with those certified values.展开更多
Using the constant addition technique,the coprecipitation of lanthanum,gadolinium,and lutetium with aragonite in seawater was experimentally investigated at 25 ℃.Their concentrations in aragonite overgrowths were det...Using the constant addition technique,the coprecipitation of lanthanum,gadolinium,and lutetium with aragonite in seawater was experimentally investigated at 25 ℃.Their concentrations in aragonite overgrowths were determined by inductive coupled plasma mass spectrometer.All these lanthanides were strongly enriched in aragonite overgrowths.The amount of lanthanum,gadolinium,and lutetium incorporated into aragonite accounted for 57%-99%,50%-89%,and 40%-91% of their initial total amount,respectively.With the increase of aragonite precipitation rate,more lanthanides were incorporated into aragonite while their relative fraction in aragonite overgrowths decreased consistently.It indicated that the coprecipitation of lanthanides with aragonite was controlled by the kinetics of aragonite precipitation.展开更多
基金中国科学院优秀博士学位论文院长奖获得者科研启动专项资金(AJ0809xx-035+3 种基金AJ0809xx-036)国家海洋局近岸海域生态环境重点实验室开放基金(200907)The CAS/SAFEA International Partnership Program for Creative ResearchTeams国家自然科学基金(40806048)
文摘An off-line chelation system combined with ICP-MS technique was developed for the quantitative determination of trace elements in seawater,namely V,Co,Ni,Cu,Zn,Mo,Cd,Pb,U and rare earth elements（REEs）.The system was built based on an ion chromatography equipped with MetPac CC-1 chelation columns which had a strong selective chelation to these target elements within a pH range 5.2—5.6.Acidified seawater samples and NH4Ac（2 mol/L） were blended to meet suitable pH before being injected into the chelation column,thus target elements were retained while alkali and alkaline metals were excluded.Then chelated elements were eluted by HNO3（1 mol/L） and samples were collected for ICP-MS analysis.Varying the ratio of input（gen.200 mL） to output（gen.5 mL）,the target elements which were concentrated as 40 times as their concentrations were far beyond instrumental quantification limits.At last,a certificated seawater CASS-4 was introduced and our detected values were in good agreement with those certified values.
基金supported by the National Natural Science Foundation of China (40376038)
文摘Using the constant addition technique,the coprecipitation of lanthanum,gadolinium,and lutetium with aragonite in seawater was experimentally investigated at 25 ℃.Their concentrations in aragonite overgrowths were determined by inductive coupled plasma mass spectrometer.All these lanthanides were strongly enriched in aragonite overgrowths.The amount of lanthanum,gadolinium,and lutetium incorporated into aragonite accounted for 57%-99%,50%-89%,and 40%-91% of their initial total amount,respectively.With the increase of aragonite precipitation rate,more lanthanides were incorporated into aragonite while their relative fraction in aragonite overgrowths decreased consistently.It indicated that the coprecipitation of lanthanides with aragonite was controlled by the kinetics of aragonite precipitation.
