分析测试学报
分析測試學報
분석측시학보
JOURNAL OF INSTRUMENTAL ANALYSIS
2014年
9期
979-985
,共7页
形态分析%高灵敏度原子荧光光谱系统%砷%硒
形態分析%高靈敏度原子熒光光譜繫統%砷%硒
형태분석%고령민도원자형광광보계통%신%서
speciation analysis%high sensitive atomic fluorescence spectrometric system%arsenic%selenium
将实验室自制的高灵敏度原子荧光光谱系统与色谱分离、在线紫外光前处理装置联用,实现了元素形态的液相色谱分离、在线紫外消解、蒸气发生及原子荧光光谱测定,并以砷、硒两元素为例对系统的分析性能进行研究。样品通过加热混旋提取、离心、过滤,使用反相色谱柱并以5.0 mmol/L磷酸氢二铵缓冲溶液(pH 5.7)-0.5 mmol/L四丁基溴化铵(TBAB)-1%甲醇为流动相进行分离;三价砷(AsO3-3)、二甲基砷( DMA)、一甲基砷( MMA)、五价砷( AsO3-4)可在7 min内进行分离和测定,硒代胱氨酸( SeCys)、硒代蛋氨酸( SeMet)、四价硒( SeO2-3)、六价硒( SeO2-4)的测定约需11 min。在优化实验条件下,方法检出限( DLs,S/N=3)为0.08~0.74μg/L;相对标准偏差( RSD,n=7)为1.4%~7.9%,实际样品的加标回收率为82.5%~116.5%;砷、硒各形态在0.28~40.0μg/L和0.38~80.0μg/L范围内线性良好。建立的联用系统稳定性好、检出限低,可实现样品中低浓度砷、硒形态的准确测定。
將實驗室自製的高靈敏度原子熒光光譜繫統與色譜分離、在線紫外光前處理裝置聯用,實現瞭元素形態的液相色譜分離、在線紫外消解、蒸氣髮生及原子熒光光譜測定,併以砷、硒兩元素為例對繫統的分析性能進行研究。樣品通過加熱混鏇提取、離心、過濾,使用反相色譜柱併以5.0 mmol/L燐痠氫二銨緩遲溶液(pH 5.7)-0.5 mmol/L四丁基溴化銨(TBAB)-1%甲醇為流動相進行分離;三價砷(AsO3-3)、二甲基砷( DMA)、一甲基砷( MMA)、五價砷( AsO3-4)可在7 min內進行分離和測定,硒代胱氨痠( SeCys)、硒代蛋氨痠( SeMet)、四價硒( SeO2-3)、六價硒( SeO2-4)的測定約需11 min。在優化實驗條件下,方法檢齣限( DLs,S/N=3)為0.08~0.74μg/L;相對標準偏差( RSD,n=7)為1.4%~7.9%,實際樣品的加標迴收率為82.5%~116.5%;砷、硒各形態在0.28~40.0μg/L和0.38~80.0μg/L範圍內線性良好。建立的聯用繫統穩定性好、檢齣限低,可實現樣品中低濃度砷、硒形態的準確測定。
장실험실자제적고령민도원자형광광보계통여색보분리、재선자외광전처리장치련용,실현료원소형태적액상색보분리、재선자외소해、증기발생급원자형광광보측정,병이신、서량원소위례대계통적분석성능진행연구。양품통과가열혼선제취、리심、과려,사용반상색보주병이5.0 mmol/L린산경이안완충용액(pH 5.7)-0.5 mmol/L사정기추화안(TBAB)-1%갑순위류동상진행분리;삼개신(AsO3-3)、이갑기신( DMA)、일갑기신( MMA)、오개신( AsO3-4)가재7 min내진행분리화측정,서대광안산( SeCys)、서대단안산( SeMet)、사개서( SeO2-3)、륙개서( SeO2-4)적측정약수11 min。재우화실험조건하,방법검출한( DLs,S/N=3)위0.08~0.74μg/L;상대표준편차( RSD,n=7)위1.4%~7.9%,실제양품적가표회수솔위82.5%~116.5%;신、서각형태재0.28~40.0μg/L화0.38~80.0μg/L범위내선성량호。건립적련용계통은정성호、검출한저,가실현양품중저농도신、서형태적준학측정。
A self-mode labs high sensitive atomic fluorescence spectrometric detection system com-bined with liquid chromatography,online ultraviolet photochemical digesting and vapor generation de-vice was established and evaluated. Arsenic and selenium species in various samples were extracted by heating-shaking and centrifugal filtration. All the analytes were separated on a reversed-phase col-umn using mobile phase of 5. 0 mmol/L phosphate buffer(pH 5. 7)-0. 5 mmol/L tetrabutyl ammonium bromide(TBAB)-1% methanol. The separations of AsO3-3 ,DMA,MMA,AsO3-4 and SeCys,SeMet, SeO2-3 ,SeO2-4 were achieved within 7 min and 11 min,respectively. Under the optimized operating con-ditions,the detection limits(DLs,S/N=3)were in the range of 0. 08-0. 74 μg/L,and the relative standard deviations( RSD,n=7 )were 1. 4% -7. 9%. The standard spiked recoveries for real samples were in the range of 82. 5% -116. 5%. Linearities were obtained in the ranges of 0. 28-40. 0 μg/L for arsenic species and 0. 38-80. 0 μg/L for selenium species. The developed system was successfully ap-plied in the detection of low levels of arsenic and selenium species in matrices.