硫化物矿物LA-ICP-MS激光剥蚀元素信号响应被引量：13

Elemental Signal Response of Sulfide Minerals in LA-ICP-MS Microanalysis

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摘要采用193 nm ArF准分子激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)对5种天然硫化物矿物进行激光剥蚀分析,基于不同硫化物矿物的剥蚀形貌特征和元素瞬时信号响应,考察了硫化物矿物的元素分馏效应及激光频率、能量和激光斑径对硫化物矿物激光剥蚀行为的影响.结果表明,不同硫化物矿物的激光剥蚀形貌和元素分馏效应存在明显差异,其中黄铁矿、辉钼矿和闪锌矿的剥蚀晕约为剥蚀斑径的10倍,而黄铜矿和磁黄铁矿的剥蚀晕约为剥蚀斑径的14倍;黄铜矿、磁黄铁矿和闪锌矿元素分馏因子(EFI)约为1.0,其元素分馏效应可以忽略,而黄铁矿和辉钼矿存在明显的元素分馏效应.在对硫化物矿物的LA-ICP-MS分析中,选择较大的激光剥蚀斑径、较小的激光剥蚀频率与激光能量可获得理想的信号强度和准确的分析结果. Five natural sulfide minerals were determined using laser ablation inductively coupled plasma mass spectrometry（LA-ICP-MS） with a 193 nm ArF excimer laser ablation system.Elemental fractionation effect and influences of spot size,repetition rate and laser energy on laser ablation behavior of different sulfides were investigated based on different laser ablation profiles and transient signal response.The results show that laser ablation characteristics and elemental fractionation effect of sulfides vary significantly with the physical properties and chemical components of sulfides.The ablation halos of pyrite,molybdenite and sphalerite are approximately 10 times the diameter of the corresponding spot size,whereas chalcopyrite and pyrrhotite are about 14 times.The elemental fractionation indexes（EFI） indicate that pyrite and molybdenite behave apparent elemental fractionation while chalcopyrite,pyrrhotite and sphalerite,EFI of which approached to 1.0,do not.For sulfide minerals microanalysis by LA-ICP-MS,accurate analysis results can be obtained under the laser ablation parameters of large spot size,low repetition rate and low laser energy.

作者柯于球张路远柴辛娜郑洪涛靳兰兰胡圣虹

机构地区中国地质大学(武汉)生物地质与环境地质国家重点实验室中国科学院地球环境研究所西安加速器质谱中心

出处《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2012年第2期257-262,共6页 Chemical Journal of Chinese Universities

基金国家自然科学基金(批准号:40973021)资助

关键词硫化物矿物激光剥蚀电感耦合等离子体质谱元素信号响应 Sulfide mineral Laser ablation inductively coupled plasma mass spectrometry（LA-ICP-MS） Elemental signal response

分类号 O657.63 [理学—分析化学]

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