【摘要】 建立了痕量锂同位素的高精度热电离质谱测量技术。通过双带测量、加入磷酸发射剂及采用预烧处理方法等途径,抑制了分馏效应,提高了痕量锂质谱分析的精度。采用浓缩锂同位素标准样品考察了测量效果,对于100ng锂样品,测量相对标准偏差好于0.086%;对于10ng锂样品,相对标准偏差好于0.90%。更多还原

【Abstract】 High precision analysis method of ng lithium by thermal ionization mass spectrometry is developed.By double-filament measurement,phosphine acid ion enhancer and sample pre-baking technique,the precision of trace lithium analysis is improved.For 100 ng lithium isotope standard sample,relative standard deviation is better than 0.086%;for 10 ng lithium isotope standard sample,relative standard deviation is better than 0.90%.更多还原