Sulfur isotopes are important geochemical tracers in the diverse fields of geosciences. Controlling the accuracy and precision of the microanalysis of sulfur isotopes requires well-characterized reference materials with matrices similar to those of unknown samples. This study introduces a new natural chalcopyrite reference material, TC1725, for S isotope analysis by laser ablation multiple-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). The chalcopyrite grain is homogeneous with respect to S isotopes based on a large number of measurements by LA-MC-ICP-MS and solution nebulizer (SN)-MC-ICP-MS. Isotope ratio mass spectrometry (IRMS) for S isotopic analysis produced a mean δ³⁴S_VCDT value of +12.78 ± 0.16‰ (2 s, n = 11). Results of SN-MC-ICP-MS and LA-ICP-MS analyses are consistent with the IRMS ratios within the uncertainty. A total of 981 sulfur isotope ratio spot measurements conducted on the cruciform sections and randomly selected chalcopyrite grains of TC1725 by LA-MC-ICP-MS yielded highly consistent sulfur isotope ratios.

中文翻译：

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TC1725：建议用于 LA-MC-ICP-MS 硫同位素测定的黄铜矿参考材料

硫同位素是地球科学各个领域中重要的地球化学示踪剂。控制硫同位素微量分析的准确度和精密度需要充分表征的参考材料，其基质类似于未知样品的基质。本研究介绍了一种新的天然黄铜矿参考材料 TC1725，可用于通过激光烧蚀多接收器电感耦合等离子体质谱 (LA-MC-ICP-MS) 进行 S 同位素分析。根据 LA-MC-ICP-MS 和溶液雾化器 (SN)-MC-ICP-MS 的大量测量结果，黄铜矿晶粒与 S 同位素是均质的。用于 S 同位素分析的同位素比质谱 (IRMS) 产生的平均 δ ³⁴ S _VCDT值为 +12.78 ± 0.16‰ (2 s, n= 11）。SN-MC-ICP-MS 和 LA-ICP-MS 分析的结果与不确定度范围内的 IRMS 比值一致。通过 LA-MC-ICP-MS 对 TC1725 的十字形截面和随机选择的黄铜矿晶粒进行了总共 981 次硫同位素比点测量，得出了高度一致的硫同位素比值。