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- Title
一步离子交换-多接收电感耦合等离子体质谱法测定高钙 生物样品的硼同位素组成
- Authors
李子夏; 逯海
- Abstract
BACKGROUND:Boron is an important trace element in high calcium biological samples,such as teeth and bones.Boron content and isotopic composition are important environmental tracers.However,the calcium content in biological samples is relatively high(> 90%),and it is impossible to separate and enrich boron isotopes by using the conventional boron-special resin separation process.OBJECTIVES:To establish an efficient method for treatment of boron isotopes in high calcium samples.METHODS:An acetic acid-ammonium acetate buffer(pH=6.0) was used as a resin regeneration solution to replace ammonia.The adsorption pH of boron resin,boron-special resin(Amberlite IRA 743) was dropped from8-9 to 6.0,thus the precipitation was avoided during digestion of the high calcium biological samples under alkaline conditions.Only one step of ion exchange is necessary to enrich boron in biological samples.The boron isotope of samples after separation was determined by multi-collector inductively coupled plasma-mass spectrometry(MC-ICP-MS) using a standard-sample-standard bracketing method.RESULTS:A one-step ion exchange method was used for separation and enrichment.The analytical accuracy of MC-ICP-MS for the determination of boron isotopes in teeth was less than 0.42‰,reaching the same level as other separation and determination methods.CONCLUSIONS:This method is not only suitable for boron isotope tracing of high calcium biological samples such as teeth and bones,but also provides a reference for the analysis of high calcium soil and marine sediment.
- Subjects
BORON isotopes; ION exchange (Chemistry); CALCIUM isotopes; MARINE sediments; TRACE elements; CALCIUM; AMMONIUM acetate; ION-permeable membranes
- Publication
Rock & Mineral Analysis, 2020, Vol 39, Issue 3, p417
- ISSN
0254-5357
- Publication type
Article
- DOI
10.15898/j.cnki.11-2131/td.201909290141