岩矿测试2026，Vol.45Issue(2)：370-381,12.DOI:10.15898/j.ykcs.202504060079
微量天然蚕丝样品的锶同位素组成高精度测定及产地溯源
High-Precision Strontium Isotope Analysis and Origin Tracing of Trace-Level Natural Silk Samples
摘要
Abstract
As one of the most representative trade commodities along the ancient Silk Road,silk artifacts have long been studied for provenance using art historical methodologies,yet have lacked scientifically rigorous analytical techniques grounded in the natural sciences.Radiogenic strontium(Sr)isotopes(87Sr/86Sr),known for their distinct geographical signatures,have emerged as a promising provenance tracing tool,with applications extending from geology into archaeology.Silkworm cocoons,the primary textile material for silk,exhibit high organic content(>95%)and low Sr concentrations(～1 μg/g).Conventional geological analysis methods typically require large sample sizes(entire or multiple cocoons or several hundred milligrams),making them unsuitable for minimally destructive analysis of precious silk artifacts.In this study,we developed a technique for high-precision Sr isotope analysis tailored to trace amounts of silk samples.By combining strong oxidant digestion(HNO3-H2O2)with Sr-specific resin purification,we achieved efficient organic matrix removal while maintaining high strontium recovery(>99%)and ultra-low procedural blanks(≤35 pg).Purified samples were analyzed using thermal ionization mass spectrometry(TIMS)with a"sandwich"loading technique and silicotungstic acid emitter,enhancing ionization efficiency to 10%.The method reliably measured as little as 0.5 ng of the NBS987 standard,yielding a mean 87Sr/86Sr ratio of 0.710251±0.000033(n=32,2SD),consistent with certified values.This approach reduces sample consumption to approximately 10 mg per analysis,representing a 1-2 order of magnitude improvement over conventional methods.This technique was then applied to cocoons of various silkworm breeds from China's five major silk-producing regions.The results revealed that Sr isotopic signatures of silk are influenced by both geographic origin and silkworm variety,with regional factors playing a dominant role.This confirms the viability of Sr isotopes as silk provenance indicators.Our technical breakthroughs in Sr isotope analysis of trace silk samples provide a foundational analytical framework for minimally invasive provenance studies of silk artifacts.The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202504060079.关键词
珍贵样品/蚕丝/锶同位素/热电离质谱法/耗样量/产地溯源Key words
precious sample/cocoon silk/strontium isotope/TIMS/sample consumption/geographic origin traceability分类
化学化工引用本文复制引用
贾丽玲,胡雅婷,胡志芳,冯兰平,周旸..微量天然蚕丝样品的锶同位素组成高精度测定及产地溯源[J].岩矿测试,2026,45(2):370-381,12.基金项目
国家重点研发计划项目"考古有机残留物生物来源精细鉴别关键技术与应用"(2022YFF0903800) （2022YFF0903800）
国家文物局文物科学技术研究项目"蚕丝纤维锶同位素提取方法优化研究"(2023ZCK016) （2023ZCK016）
浙江省文物保护科技项目"基于树脂交换分离技术对蚕丝中锶元素的分离富集方法研究"(2024003) （2024003）
